JP2022054168A - Power control device and power control method - Google Patents

Abstract

[Problem] To provide a power control system that, when there is an external power generation device not under its control, identifies whether the external power generation device is a solar power generation device. [Solution] A power control system 11 that supplies power to a power load 17 includes a solar power generation system having a solar power generation device 13, a power conditioner 19, a controller 21, and/or a server 97. When an external power generation device 25 supplies power to power loads 17-1 to 17-n in addition to the solar power generation system, the controller includes an external power generation determination unit 103 that acquires information about the external power generation device and determines whether the external power generation device is a solar power generation device. [Selected Figure] Figure 1

Description

The present invention relates to power control of a photovoltaic system.

Residential photovoltaic power generation systems were launched in the first half of the 1990s, dating back about 20 years, and gradually became widespread. Became.
The controller (control device) that controls the photovoltaic power generation system is usually installed as a set with products of the same company as the solar panel and storage battery. However, as time goes by, it is expected that the number of scenes of replacing old models and adding to existing systems will gradually increase.

Conventional controllers are designed on the premise of controlling solar panels and storage batteries provided by the same operator. It is basically impossible to control a model of another company with different specifications or unknown specifications. In addition, even the same operator may not be able to control the old model due to differences in specifications. Furthermore, it is expected that there will be an increasing number of cases where private power generation devices other than the solar power generation system are installed in the same house and coexist with the solar power generation system.
Even when a power generation device that is not under its control coexists, it is possible for the controller to obtain power information related to the power generation device from, for example, a converter connected to the power generation device. Alternatively, the controller obtains power information including the power generation device from a smart meter or the like placed on the main line from the power lead-in line to the house to the distribution board, and calculates the power of the power generation device that is not under its control. It is possible.

By the way, in recent years, the purchase price of energy has been declining, and especially after the electricity purchase period under the FIT (Feed-in Tariff) system has expired, the electricity purchase price of private power generation will decrease. Therefore, it is required to supply and supply privately-generated power without selling it. However, power generation using renewable energy such as solar power generation tends to fluctuate due to the influence of the natural environment.
In connection with this, the following technologies have been proposed that control each device by generating an operation schedule for each device based on the predicted power generation amount of the photovoltaic power generation device and the predicted load amount of each device (for example). See Patent Document 1).

When the operation schedule of the device is generated, if the operation time of the specific device is set in the time zone when the predicted power generation amount is lower than the predicted load amount, the predicted power generation amount exceeds the predicted load amount at the operation time of the device. Change to the time zone. This will reduce the surplus power of photovoltaic power generation. Then, the amount of late-night power to be charged is calculated from the predicted power load, the predicted power generation amount, and the remaining power amount in the power storage device, and the charge amount of the power storage device is controlled. In this way, if there is a time zone in which the surplus power generated by the photovoltaic power generation device is large, the surplus power is consumed by the device as much as possible, and the surplus power is charged to the power storage device.

Japanese Unexamined Patent Publication No. 2011-92002

When power generation equipment that is not under its own control coexists, if the power generation prediction control based on the power generation power prediction of the photovoltaic power generation system is performed without considering the power generation power of the power generation equipment, the obtained economic effect will be reduced. There is a risk. Therefore, it is desirable to consider the generated power of the power generation device that is not under its control.
From the above, it is necessary to understand the power generation characteristics of power generation equipment that is not under its control.
The present invention has been made in consideration of the above circumstances, and when there is an external power generation device that is not under its own control, the power control device that specifies whether or not the external power generation device is photovoltaic power generation. Is to provide.

This invention
It is a power control device of a photovoltaic power generation system that supplies power to a power load, and when an external power generation device supplies power to the power load in addition to the photovoltaic power generation system, information on the external power generation device is acquired. Further, the present invention provides a power control device including an external power generation determination unit for determining whether or not the external power generation device is photovoltaic power generation.

Also, from a different point of view, the present invention
Information about the external power generation device when the power control device of the photovoltaic power generation system that supplies power to the power load and the external power generation device supplies power to the power load in addition to the photovoltaic power generation system. Provided is a power control method including a step of acquiring the above and a determination step of determining whether or not the external power generation device is photovoltaic power generation.

Since the power control device according to the present invention includes an external power generation determination unit that determines whether or not the external power generation device is photovoltaic power generation, it is possible to specify whether or not the external power generation device is photovoltaic power generation.
The power control method according to the present invention also has the same effect.

It is a block diagram which shows the structure of the electric power control system which concerns on embodiment of this invention. It is explanatory drawing which shows an example of the predicted power generation power, the predicted power consumption, and the charge / discharge schedule of the storage battery based on the predicted power generation power in the power control system of FIG. It is a flowchart which shows the example of the process which the external power generation determination part determines whether or not the external power generation apparatus is solar power generation in Embodiment 2. In the third embodiment, it is a graph which shows an example of the power consumption of a power load and the power generation power of the ENE-FARM operating in the first power generation mode. In the third embodiment, it is a graph which shows an example of the power consumption of a power load and the power generation power of the ENE-FARM operating in the second power generation mode. In the third embodiment, it is the first flowchart which shows the example of the process which the external power generation determination part determines whether or not the external power generation apparatus is a solar power generation. In the third embodiment, it is the second flowchart which shows the example of the process which the external power generation determination part determines whether or not the external power generation apparatus is a solar power generation. It is explanatory drawing which shows an example of the setting screen displayed on the information terminal in Embodiment 4.

Hereinafter, the present invention will be described in more detail with reference to the drawings. It should be noted that the following description is exemplary in all respects and should not be construed as limiting the invention.
≪Power control system configuration≫
First, a configuration example of the power control system according to this embodiment will be described.
FIG. 1 is a block diagram showing a configuration of a power control system according to an embodiment of the present invention. As shown in FIG. 1, the power control system 11 according to this embodiment includes a photovoltaic power generation system. The photovoltaic power generation system includes a photovoltaic power generation device 13, a storage battery 15 as a power storage device, a power conditioner 19, and a controller 21. The photovoltaic power generation system supplies electric power to electric power loads 17-1 to 17-n of home appliances and the like, and is connected to an external electric power system 23. The power conditioner 19 is also called PCS, which is an acronym for Power Conditioning System. The controller 21 can communicate with the external server 97 via the network 98.
Further, the power control system 11 includes an external power generation device 25 and a converter 27 that are not under the control of the controller 21. The external power generation device 25 also supplies electric power to the electric power loads 17-1 to 17-n.
The photovoltaic power generation device 13 and the power conditioner 19 shown in FIG. 1 are included in the photovoltaic power generation system according to the embodiment of the present invention. Further, the controller 21 and / or the server 97 is included in the photovoltaic system according to the embodiment of the present invention. Further, the storage battery 15 may be included in the photovoltaic power generation system according to the embodiment of the present invention.
The external power generation device 25 and the converter 27 constitute an external power generation system according to an embodiment of the present invention.

In FIG. 1, the power generated by the photovoltaic power generation device 13 is P _PV , the power of the storage battery 15 is P _bat (positive during discharge, negative during charging), and the power consumed by the power loads 17-1 to 17-n is used. It is set to P _L1 to P _Ln . Further, the input / output power of the power conditioner is shown by P _PCS , the power generated by the external power generation device 25 is shown by P _Gene , and the power transmitted / received from the power system is shown by P _s .
The external power generation device 25 is not connected to the power conditioner 19, so that the controller 21 cannot control the external power generation device 25. However, the electric power P _Gene generated by the external power generation device 25 can be known from the converter 27 connected to the external power generation device 25.

The photovoltaic power generation device 13 includes a solar cell module, and supplies DC power generated by the solar cell module to the power conditioner 19. The DC / DC converter 19a of the power conditioner 19 converts the DC power supplied from the photovoltaic power generation device 13 into a predetermined voltage. The DC / DC converter 19a is a one-way operation from the photovoltaic power generation device 13, and blocks the flow of electric power in the opposite direction.
The storage battery 15 includes a secondary battery such as a lithium ion battery. The DC / DC converter 19b of the power conditioner 19 converts the DC voltage from the storage battery 15 into a predetermined voltage at the time of discharge, and transfers the DC voltage to the power loads 17-1 to 17-n and the power system 23 via the bidirectional inverter 19c. Output. At the time of charging, the voltage from the photovoltaic power generation device 13, the external power generation device 25, or the power system 23 is converted into a DC voltage having an appropriate size for charging and provided to the storage battery 15. The DC / DC converter 19b operates in both directions.

The bidirectional inverter 19c converts the DC voltage output from the photovoltaic power generation device 13 or the storage battery 15 via the DC / DC converter into a predetermined voltage and an AC voltage having a predetermined frequency. Further, the AC voltage from the external power generation device 25 and the power system 23 is converted into a DC voltage and provided to the storage battery 15 side.
The controller 21 and the power conditioner 19 may be integrated.

The controller 21 controls the power conditioner 19 to supply the electric power generated by the photovoltaic power generation device 13 to the storage battery 15 and the electric power system 23. Further, by controlling the power conditioner 19, the direction of charging and discharging of the storage battery 15 and its electric power (electric power amount) are controlled.
The controller 21 is configured to include circuits such as a memory, an input / output interface circuit, and a communication interface circuit, centering on a CPU as a hardware resource.

The controller 21 sequentially acquires the values of the generated power _{PPV of the photovoltaic power generation device 13 for each predetermined period (for example, every 30 minutes) and the charge / discharge power P bat of} the storage battery 15 for each predetermined period from the power conditioner 19. Further, the values of the power consumptions _{PL1 to PLn for} each predetermined period may be sequentially acquired by communicating with the respective power loads 17-1 to 17-n. Then, the total power consumption may be calculated.

Further, a smart meter or a CT sensor (not shown in FIG. 1) is used to _acquire the value of the power transmitted / received from the power system for each predetermined period. Further, the value of the external power generation power P _Gene , which is the power generation power of the external power generation device 25, is sequentially acquired from the converter 27. Alternatively, a power sensor (or current sensor) may be installed in the line from the converter 27 to the power system 23, and the value of the external generated power P _Gene may be acquired from the installed power sensor (or current sensor). In the case of a current sensor, it is necessary to convert the current into electric power, but if the electric power of the system is substantially constant, the conversion is easy.
Even if the values of the power consumption P _L1 to P _Ln of each power load are not acquired, the total power consumption is obtained from the generated power P _PV , the external generated power P _Gene , the power P _bat of the storage battery 15, and the power transmission / reception power P _s . Can be calculated, so it may be done.

The acquired power generation power P _PV , power P _bat of the storage battery 15, external power generation power P _Gene , and power consumption (total of _PL1 to _PLn ) are stored as the power generation / consumption history 101 (of the controller 21 in FIG. 1). See block). Alternatively, the power generation / consumption history 101 is stored in the server 97 that can communicate via the network 98 (indicated by a chain line in the block of the server 97 in FIG. 1). The power generation / consumption history 101 is time-series data of power generation and power consumption for each predetermined period. The power generation / consumption history 101 may include the total received power P _s from the power system 23, but the P _s is as long as P _PV , P _bat , P _Gene , and ΣP _Ln are stored in the power generation / consumption history 101. It can be calculated.

The controller 21 or the server 97 includes an external power generation determination unit 103 and a power adjustment unit 105. The external power generation determination unit 103 determines the power generation characteristics of the external power generation device 25, particularly whether or not it is solar power generation. The power adjustment unit 105 acquires weather information via the network 98, and stores the acquired weather information in association with the power generation / consumption history 101.
The power generation / consumption history 101, the external power generation determination unit 103, and the power adjustment unit 105 may be in the controller 21 or the server 97, respectively. Alternatively, part of the function may be in the controller 21 and the other part may be in the server 97.

As described above, the controller 21 uses the generated power PPV of the photovoltaic power generation device 13, the charge / discharge power P _bat of the storage battery 15, the power transmission / reception power _PS with the power system 23, the external power generation power _{P Gene} , and the load power P _L1 . The values of ~ _PLn are sequentially acquired.
Based on the acquired information, the power adjusting unit 105 determines the power consumption P _L1 to the power load 17-1 to 17-n from the total of the generated power _{PPV of the photovoltaic power generation device 13 and the external generated power P Gene .} The surplus power obtained by subtracting the sum of _PLn is sequentially calculated. Then, the value of the stored amount (remaining capacity) of the storage battery 15 with the passage of time is acquired. The stored amount of the storage battery 15 can be sequentially acquired from the power conditioner 19.

Further, the external power generation determination unit 103 and the power adjustment unit 105 may notify the user of the state of the power control system 11 to the information terminal 31 of the user who can communicate with the controller 21. Further, the information terminal 31 may accept the settings related to the control of the power control system 11 by the user. Here, an example of the information terminal 31 is a portable terminal such as a smartphone or tablet terminal owned by a user, or a stationary or portable personal computer or the like. Another example is a monitor installed in the home (whether dedicated or not).

<< Charging / discharging control of storage battery 15 based on prediction-Prediction control mode >>
The electric power adjustment unit 105 acquires weather information of a future target date (typically tomorrow, hereinafter referred to as the target date) via the network 98. In addition, the stored past power generation / consumption history 101 and the weather information associated therewith are accessed and acquired. Then, the generated power and the power consumption of the day are predicted, and the time-series data of the predicted generated power and the power consumption for each predetermined period is generated.
Then, the predicted surplus power of the difference is calculated from the time series data of the predicted generated power and the power consumption. Based on the obtained predicted surplus power, the charge amount of the storage battery 15 to be executed during the midnight power time zone of the previous day is determined. Hereinafter, receiving power supply from the power system 23 is referred to as power purchase.

If it is predicted that there is no surplus power, the power adjustment unit 105 should purchase power from the night before to the day of the day during the midnight power hours when the unit price of power is cheap, and charge the storage battery 15 to a predetermined capacity. Controls the power conditioner 19. If the power amount of the difference obtained by subtracting the predicted power generation amount from the predicted power consumption of the day is the full capacity or more, the storage battery is charged to the full capacity. On the other hand, if the differential electric energy is less than the full capacity, the battery is charged to the differential electric energy. During the time when the electricity charge on the day is high and the power consumption cannot be covered by the power generated by the photovoltaic power generation device 13, the power stored in the storage battery 15 is supplied to the power loads 17-1 to 17-n. When the remaining capacity of the storage battery 15 becomes zero, power is purchased from the power system 23 and supplied to the power loads 17-1 to 17-n.
In this way, during the time period when the power generation of the photovoltaic power generation device 13 is less than the power consumption, the power stored in the midnight power time zone is allocated to suppress expensive power purchase as much as possible.

On the other hand, when it is predicted that there will be a time zone in which surplus power is generated, the power adjusting unit 105 will store the surplus power in the time zone in which the power generation of the photovoltaic power generation device 13 is predicted to exceed the power consumption on that day. The power conditioner 19 is controlled so as to store in 15. When the power consumption cannot be covered by the power generation of the photovoltaic power generation device 13 during the time when the electricity charge is high, the power stored in the storage battery 15 is supplied to the power loads 17-1 to 17-n. However, if the remaining capacity of the storage battery 15 becomes zero by the end of the day, power is purchased and supplied to the power loads 17-1 to 17-n. In this way, the storage battery 15 is stored in the time zone in which the power generation of the photovoltaic power generation device 13 is larger than the power consumption, that is, the time zone in which the surplus power is generated. Then, the stored electric power is applied to the power consumption in the time zone when the power generation of the photovoltaic power generation device 13 is less than the power consumption, and the expensive power purchase is suppressed.

FIG. 2 is an explanatory diagram showing an example of a control schedule of the predicted power generation amount, the predicted power consumption amount, and the charge / discharge of the storage battery 15 in the power control system of FIG. It shows the transition of each predetermined time Δt on a certain day. Although the vertical axis in FIG. 2 is electric power, it is converted into the electric energy for each predetermined time Δt by multiplying by Δt.
In FIG. 2, t1 corresponds to the midnight power time zone from midnight of the previous day to early morning of the day. The storage battery 15 is charged to a certain amount having a margin for charging the storage battery 15 with the predicted surplus power consumption predicted to occur on the day. The electric power required for charging is covered by purchasing electric power from the electric power system 23.

t2 corresponds to the time zone in the morning when the predicted power consumption reaches the first peak. A part of the predicted power consumption can be covered by the power generation of the photovoltaic power generation device 13, but the predicted power generation amount at this point is smaller than the predicted power consumption amount. The shortage is covered by the discharge from the storage battery 15.
t3 corresponds to the daytime time zone in which the photovoltaic power generation device 13 provides a large amount of generated power. Part of the generated power will be used to cover the predicted power consumption (self-consumption), but the predicted surplus power will be charged.
t4 corresponds to the time zone of the night when the power generation of the photovoltaic power generation device 13 is stopped and the predicted power consumption reaches the peak. While the storage battery 15 has a remaining capacity, the predicted power consumption is covered by the discharge from the storage battery 15.

t5 corresponds to the time zone after the remaining capacity of the storage battery 15 becomes zero. When the remaining capacity of the storage battery 15 becomes zero, the predicted power consumption is covered by purchasing power from the power system 23.
Time t6 corresponds to the same midnight time zone as time t1. In the midnight time zone, in addition to the predicted power consumption, the storage battery 15 is charged by purchasing power from the power system 23.
As described above, when the predicted power generation power, the predicted power consumption, and the storage schedule are obtained, the amount of power transmitted / received to / from the power system 23 can be predicted. In FIG. 2, the portion shown by the gray background (including the time zone of t1, t2, t5, t6) is the amount of power received by the power purchase from the power system 23, and the portion shown by the dot background (time zone of t3). Is the amount of electric power for charging the storage battery 15 with surplus electric power.

In this way, in order to obtain a high economic effect by controlling the storage of surplus power in the storage battery 15 during the time when surplus power is generated, it is necessary to accurately predict the amount of surplus power generated on the day at the stage of the previous day. be. This is because the power adjusting unit 105 controls so as to suppress the charge amount of the storage battery 15 performed in the midnight power time zone of the previous day based on the predicted surplus power amount. That is, the charging of the storage battery 15 in the night power time zone t1 of the previous day is controlled so as to minimize the amount of power purchased on the day by limiting the charge to the amount corresponding to the shortage that the predicted power consumption cannot cover with the predicted power generated on the day. .. By doing so, there is room for storing the surplus electric power in the time zone t3 of the day in the storage battery 15.

However, if the prediction accuracy of the surplus power is low and the actual surplus power is lower than the predicted surplus power, the shortage will be purchased in the time zone t3 where the electricity rate is relatively high. In that case, the economic effect does not reach the ideal state of charging the storage battery 15 to an appropriate amount during the cheap midnight time zone. On the other hand, if the actual surplus power exceeds the predicted surplus power, the surplus power that cannot be charged in the time zone t3 will be sold. In particular, in the case of a system in which the purchase period under the FIT system has expired and the unit price of electricity sold is low, the economic effect in that case does not reach the ideal state of zero electricity sales.

Further, the storage battery 15 may be consumed instead of being controlled to store the surplus power in the time zone in which the surplus power is generated. For example, instead of controlling an electric water heater as a power load to boil the entire amount of hot water required for a day using nighttime electric power, a part of it is boiled using surplus electric power. In order to obtain a high economic effect by generating such an operation schedule of the electric water heater, it is necessary to accurately predict the amount of surplus electric power generated on the day at the stage of the previous day. This is because the power adjusting unit 105 controls so as to suppress the amount of boiling water performed in the midnight power time zone of the previous day based on the predicted surplus power amount. That is, the amount of boiling water in the night power time zone t1 of the previous day is controlled so as to be commensurate with the shortage that the predicted power consumption cannot cover with the predicted power generation of the day. Then, the surplus electric power in the time zone t3 of the day is used for boiling water.

However, if the prediction accuracy of the surplus power is low and the actual surplus power is lower than the predicted surplus power, the shortage will be purchased in the time zone t3 where the electricity rate is relatively high. In that case, the economic effect does not reach the ideal state of boiling water to an appropriate amount during the cheap midnight hours. On the other hand, if the actual surplus power exceeds the predicted surplus power, the surplus power that cannot be charged in the time zone t3 will be sold. In particular, in the case of a system in which the purchase period under the FIT system has expired and the unit price of electricity sold is low, the economic effect in that case does not reach the ideal state of zero electricity sales.

One of the major factors in whether or not the predicted surplus power of the day can be predicted with high accuracy is to properly grasp the characteristics of the external power generation device 25. If the characteristics of the external power generation device can be grasped, the power generation power of the external power generation device 25 can be predicted. Then, it is important to appropriately determine whether or not the external power generation device 25 is solar power generation in order to grasp its characteristics. This is because if the external power generation device 25 is photovoltaic power generation, it is considered that the generated power is likely to be substantially similar to the photovoltaic power generation device 13, and therefore the external power generation device is based on the correlation with the weather information of the day. The generated power of 25 can be predicted with high accuracy. Therefore, the prediction accuracy is improved by determining whether or not the external power generation device 25 is photovoltaic power generation and predicting the generated power of the external power generation device 25 based on the determination result. However, even if the external power generation device 25 is photovoltaic power generation, there is a possibility that the generated powers of both are not completely similar because the installation location, direction, and characteristics of the solar panel are different from those of the photovoltaic power generation device 13. .. Therefore, the judgment is made based on the correlation between the two.

On the other hand, if the external power generation device 25 is a power generation device of a type different from that of photovoltaic power generation, it is necessary to predict the generated power according to its characteristics. In addition to solar power generation, one of the household power generation devices that has become widespread in recent years is a household fuel cell (also called ENE-FARM).
The external power generation determination unit 103 acquires information about the external power generation device 25 and determines whether or not the external power generation device 25 is photovoltaic power generation. The information regarding the external power generation device 25 is information regarding the power generation method of the external power generation device 25 or information regarding the power generation of the external power generation device 25. The external power generation determination unit 103 determines the power generation method based on the information regarding the power generation method of the external power generation device 25. Further, the external power generation determination unit 103 determines the power generation method based on the information regarding the power generation of the external power generation device 25.

≪Characteristic judgment of external power generator≫
(Embodiment 1)
In this embodiment, the external power generation determination unit 103 determines the power generation method based on the information regarding the power generation of the external power generation device 25. The external power generation determination unit 103 calculates, for example, the correlation coefficient between the time-series power generation of the photovoltaic power generation device 13 and the time-series power generation of the external power generation device 25 in a certain period, for example, every day, and for a certain arbitrary period. If the average value of the correlation coefficients calculated in 1 is equal to or greater than the threshold value, the external power generation is determined to be photovoltaic power generation. In one numerical example, the period is one month and the threshold is 0.86.
That is, if the power generation characteristics of the external power generation device 25 are similar to the power generation characteristics of the solar power generation device 13, it is determined to be photovoltaic power generation.

Now, the time-series data of the generated power at the time t ₁ , t ₂ , t ₃ , ..., T _n of the photovoltaic power generation device 13 is set to x ₁ , x ₂ , x ₃ , ..., X _n , and the external power generation device 25. Let y ₁ , y ₂ , y ₃ , ..., y _n be the time-series data of the generated power at the time t ₁ , t ₂ , t ₃ , ..., T _n . The correlation coefficient r between the generated power data x _i and y _i (i = 1 to n) is calculated by the following known equation.

前述の期間および閾値は、固定された値であってもよいが、例えば、図１に示す情報端末３１を用いてユーザがその少なくとも何れかを設定可能であってもよい。

The above-mentioned period and threshold value may be fixed values, but for example, at least one of them may be set by the user using the information terminal 31 shown in FIG.

(Embodiment 2)
As a different determination method for determining whether or not the external power generation device 25 is photovoltaic power generation, if the external power generation device 25 generates power during the night time, it can be considered that it is not photovoltaic power generation.
As a more specific determination method, for example, the number of days determined to be solar power generation is the number of days in which the external power generation device 25 does not generate power during the nighttime period in an arbitrary period (one example is in units of one month). If it is less than a predetermined standard value, it can be determined that the external power generation is photovoltaic power generation.

FIG. 3 is a flowchart showing an example of a process in which the external power generation determination unit 103 determines whether or not the external power generation device 25 is solar power generation in this embodiment.
In FIG. 3, the external power generation determination unit 103 refers to time-series data of the generated power of the external power generation device 25 over a predetermined period (for example, one month) for determining the characteristics of the external power generation device 25. .. The data is a part of the power generation / consumption history 101.
Then, the relevant data for each day is referred to. First, the data on the first day is referred to (step S10).

Then, it is examined whether or not power generation was performed in any time zone of the target day (step S12). When power generation is not performed in any time zone (No in step S12), the external power generation determination unit 103 determines that the external power generation device 25 is not photovoltaic power generation (step S20). Then, it is examined whether or not all the days within the period are set as the target days (step S22). If there is a day that has not been targeted yet (No in step S22), the day that has not been targeted yet is set as a new target day (step S23), the process is returned to the above-mentioned step S12, and power generation is performed in any time zone of that day. Find out if was done.

In the determination of step S12, if there is power generation in any time zone of the target day (Yes in step S12), then the external power generation determination unit 103 determines whether or not the power generation in the nighttime zone without sunshine is zero. Check (step S14). If the generated power in the night time zone without sunshine is not zero (No in step S14), the external power generation determination unit 103 determines that the external power generation device 25 is not photovoltaic power generation (step S20). The determination in the subsequent step S22 is as described above.
On the other hand, when the power generation in the night time zone is zero (Yes in step S14), the external power generation determination unit 103 determines that the external power generation device 25 is photovoltaic power generation (step S16). Then, the counter for the number of days determined to be solar power generation during the period is counted up (step S18). The initial value of the counter at the start of this process is zero.

Subsequently, the external power generation determination unit 103 advances the processing to the above-mentioned step S22, and checks whether or not all the days within the period are targeted (step S22). If there is a day that has not been targeted yet (No in step S22), the day that has not been targeted yet is set as a new target day (step S23), the process is returned to the above-mentioned step S12, and power generation is performed in any time zone of that day. Find out if was done.
When all the days within the period are targeted (Yes in step S22), the external power generation determination unit 103 checks whether the counter for the number of days determined to be photovoltaic power generation within the period is equal to or higher than a predetermined threshold value (Yes). Step S24).

If the counter for the number of days determined to be photovoltaic power generation within the period is equal to or greater than the threshold value (Yes in step S24), it is finally determined that the external power generation device 25 is photovoltaic power generation (step S26), and the process is terminated. ..
On the other hand, if the counter for the number of days determined to be photovoltaic power generation within the period is less than the threshold value (No in step S24), it is finally determined that the external power generation device 25 is not photovoltaic power generation (step S28), and the process is terminated. do.
The above is the process in which the external power generation determination unit 103 determines whether or not the external power generation device 25 is photovoltaic power generation based on the information regarding the power generation of the external power generation device 25 in this embodiment.
The above-mentioned period and threshold value may be fixed values, but for example, the user may be able to set at least one of them by using the information terminal 31 shown in FIG.
By the way, in the flowchart shown in FIG. 3, after a predetermined period (for example, one month) has passed, it is determined whether or not the external power generation device 25 is photovoltaic power generation for all days of the target period, and the determination is made after the predetermined period elapses. It is a mode that repeats every time. As a different embodiment, for example, every day, at a predetermined time, the data of the previous day is referred to to determine whether or not the external power generation device 25 is solar power generation, and the determination is repeated every day for a predetermined period (for example, one month). After that, the final judgment may be made based on the daily judgment result of the target period.

(Embodiment 3)
Along with solar power generation, household fuel cells (ENE-FARM) are becoming more widespread in power control systems. In this embodiment, the external power generation determination unit 103 assumes that the generator other than the photovoltaic power generation is often an ENE-FARM, and determines whether or not the external power generation device 25 exhibits the power generation characteristics of the ENE-FARM. If the power generation characteristics of ENE-FARM are not shown, it is determined to be photovoltaic power generation.

The following two power generation modes can be considered as the power generation characteristics of ENE-FARM.
The first power generation mode is a mode in which ENE-FARM generates power so as to follow the power consumption of the power control system 11. The power consumption here may be the total of the power loads 17-1 to 17-n, that is, the total load power, but the generated power of the photovoltaic power generation device 13 and the discharge of the storage battery 15 are subtracted from the total load power. It may be just the amount. It depends on which of the external power generation devices 25 is detected as the total load power and controls its own power generation amount.
FIG. 4A is a graph showing an example of the power consumption of the load by this power generation mode and the power generated by the external power generation device 25 with respect to the power consumption. As shown in FIG. 4A, the power consumption is within the range of the power generation capacity (rated power generation power) of the external power generation device 25, and the power generation power of the external power generation device 25 follows the power consumption of the load, and both are substantially equal. When the power consumption exceeds the power generation capacity (rated power generation power) of the external power generation device 25, the power generation of the external power generation device 25 reaches a plateau, and the shortage of power is covered by the purchase of power from the power system 23.

As shown in FIG. 4A, when the energy farm as the external power generation device 25 generates power in a mode that follows the power consumption of the load, the power generation power of the external power generation device 25 and the power control system 11 within the range of the power generation capacity of the energy farm. Power consumption is almost equal. When the external power generation device 25 exhibits such power generation characteristics, the external power generation determination unit 103 can determine that the external power generation device 25 is an ENE-FARM and not solar power generation.
If the power consumption of the power control system 11 exceeds the power generation capacity of the ENE-FARM, power purchase occurs. In other words, power purchase occurs only when the generated power of the external power generation device 25 is constant (maximum).

The second power generation mode of ENE-FARM is a mode in which power is always generated at the rated power. In the case of solar power generation, the generated power fluctuates depending on the weather. On the other hand, this power generation mode generates a constant amount of power regardless of the weather.
FIG. 4B is a graph showing an example of the power consumption of the load by this power generation mode and the power generated by the external power generation device 25 with respect to the power consumption. As shown in FIG. 4B, the external power generation device 25 generates a certain amount (rated power generation power) regardless of the power consumption. When the power consumption exceeds the power generation capacity (rated power generation power) of the external power generation device 25, the shortage of power is covered by the purchase of power from the power system 23.

As shown in FIG. 4B, when the generated power of the external power generation device 25 is always constant, the external power generation determination unit 103 can determine that the external power generation device 25 is ENE-FARM and not photovoltaic power generation.
In addition, FIG. 4A and FIG. 4B both show an example of the transition of the power generation power and the power consumption in one day. The external power generation determination unit 103 determines whether or not the external power generation device 25 is photovoltaic power generation on a daily basis based on the transition of the power consumption of the power control system 11 per day and the transition of the power generation of the external power generation device 25 with respect to the transition. I do. Then, the number of days determined not to be photovoltaic power generation is counted in a unit of a predetermined period (for example, one month). If the number of days counted during the period is less than a predetermined threshold value, the external power generation is determined to be photovoltaic power generation.

5A and 5B are first flowcharts showing an example of a process in which the external power generation determination unit 103 determines whether or not the external power generation device is solar power generation in this embodiment.
In FIG. 5A, the external power generation determination unit 103 refers to time-series data of the generated power of the external power generation device 25 over a predetermined period (for example, one month) for determining the characteristics of the external power generation device 25. .. The data is a part of the power generation / consumption history 101.
Then, the relevant data for each day is referred to. First, the data on the first day is referred to (step S30).

Then, it is examined whether or not power generation was performed in any time zone of the target day (step S32). When power generation is not performed in any time zone (No in step S32), the external power generation determination unit 103 determines that the external power generation device 25 is not photovoltaic power generation (step S52 in FIG. 5B). Then, the counter for the number of days determined not to be solar power generation during the period is counted up (step S54). The initial value of the counter at the start of this process is zero. Then, it is examined whether or not all the days within the period were set as the target days (step S56). If there is a day that has not been targeted yet (No in step S56), the day that has not yet been targeted is set as a new target day (step S57), the process is returned to step S32 in FIG. Find out if power was generated in.

In the determination of step S32 in FIG. 5A, if there is power generation in any time zone of the target day (Yes in step S32), then the external power generation determination unit 103 determines whether the power generation in the nighttime zone without sunshine is zero. Check whether or not (step S34). If the generated power in the night time zone without sunshine is not zero (No in step S34), the external power generation determination unit 103 determines that the external power generation device 25 is not photovoltaic power generation (step S52 in FIG. 5B). Subsequent processing of step S54 in FIG. 5B and determination of step S56 are as described above.

In the determination of step S34 in FIG. 5A, when the generated power in the night time zone without sunshine is zero (Yes in step S34), the external power generation determination unit 103 subsequently starts power generation after the external power generation device 25 starts power generation. It is examined whether or not the continuing period is less than a predetermined period (step S36). When the period during which power generation continues is a predetermined period or longer (No in step S36), the external power generation determination unit 103 determines that the external power generation device 25 is not photovoltaic power generation (step S52 in FIG. 5B). A typical example of the predetermined period is 24 hours. Subsequent processing of step S54 in FIG. 5B and determination of step S56 are as described above.

In the determination of step S36 of FIG. 5A, when the period during which power generation continues is less than a predetermined period (Yes in step S36), the external power generation determination unit 103 subsequently determines the time zone during which the external power generation device 25 is generating power. Check whether the generated power is fluctuating or constant (step S38). In other words, it examines whether the change in generated power over time is outside or within a predetermined range. This is a determination as to whether or not it corresponds to the power generation characteristic shown in FIG. 4B. When the generated power during power generation is constant (No in step S38), the external power generation determination unit 103 determines that the external power generation device 25 is not photovoltaic power generation (step S52 in FIG. 5B). Subsequent processing of step S54 in FIG. 5B and determination of step S56 are as described above.

When there is a fluctuation in the generated power during power generation in the determination in step S38 of FIG. 5A (Yes in step S38), the external power generation determination unit 103 subsequently makes the following determination. Whether the length of the period for which the magnitude of the difference between the generated power and the power consumption (absolute value of the error) is larger than the predetermined value (first reference value) or the number of judgments is greater than or equal to the reference value. Check whether or not (step S40). That is, it is examined whether or not the power generation is controlled so that the error between the generated power and the power consumption is within a predetermined range. This is a determination as to whether or not it corresponds to the power generation characteristic shown in FIG. 4A. When the length of the period when the error is larger than the predetermined value or the number of judgments is less than the first reference value, that is, when the power generation is controlled so that the difference between the generated power and the power consumption is within the predetermined range ( No) in step S40), the external power generation determination unit 103 determines that the external power generation device 25 is not photovoltaic power generation (step S52 in FIG. 5B). Subsequent processing of step S54 in FIG. 5B and determination of step S56 are as described above.

In the determination of step S40 of FIG. 5A, when the period during which the error is larger than the predetermined value or the number of times is equal to or greater than the first reference value, that is, the power generation is controlled so that the difference between the generated power and the power consumption is within the predetermined range. If not (Yes in step S40), the external power generation determination unit 103 subsequently makes the following determination. It is examined whether or not the period in which the generated power in the time zone in which the power is purchased is determined to be substantially constant or the number of determinations is less than a predetermined value (second reference value) (step S42). In other words, the length of the period in which the temporal change of the generated power during power purchase is considered to be within a predetermined range or the number of determinations is examined. This is a determination as to whether or not the generated power of the external power generation device 25 corresponds to the state in which the rated power is reached in FIGS. 4A and 4B. When the period in which the generated power in the time zone during which the power is purchased is considered to be the same value or the number of determinations is equal to or greater than the second reference value (No in step S42), the external power generation device 25 determines the external power generation determination unit 103. It is determined that the power generation is not solar power generation (step S52 in FIG. 5B). Subsequent processing of step S54 in FIG. 5B and determination of step S56 are as described above.

On the other hand, when the period in which the generated power in the time zone in which the power is purchased is considered to be the same value or the number of determinations is less than the second reference value (Yes in step S42), the external power generation determination unit 103 performs external power generation. It is determined that the device 25 is photovoltaic power generation (step S50 in FIG. 5B).

Subsequently, the external power generation determination unit 103 advances the processing to the above-mentioned step S56, and checks whether or not all the days within the period are targeted (step S56). If there is a day that has not been targeted yet (No in step S56), the day that has not yet been targeted is set as a new target day (step S57). Then, the process is returned to step S32 of FIG. 5A, and it is checked whether or not power generation is performed in any time zone of the day.
When all the days in the period are targeted (Yes in step S56 in FIG. 5B), the external power generation determination unit 103 determines whether or not the counter for the number of days determined not to be photovoltaic power generation within the period is less than a predetermined threshold value. (Step S58).

If the counter for the number of days determined not to be photovoltaic power generation within the period is less than the threshold value (Yes in step S58), it is finally determined that the external power generation device 25 is photovoltaic power generation (step S60), and the process is terminated. do.
On the other hand, if the counter for the number of days determined not to be photovoltaic power generation within the period is equal to or greater than the threshold value (No in step S58), it is finally determined that the external power generation device 25 is not photovoltaic power generation (step S62), and the process is performed. finish.

The above is the process in which the external power generation determination unit 103 determines whether or not the external power generation device 25 is photovoltaic power generation based on the information regarding the power generation of the external power generation device 25 in this embodiment.
The above-mentioned period, the first reference value, the second reference value, and the threshold value may be fixed values, but for example, the user uses at least one of the information terminals 31 shown in FIG. May be set.
By the way, the flowcharts shown in FIGS. 5A and 5B indicate whether or not the external power generation device 25 is not photovoltaic power generation (ENE-FARM) for all days of the target period after a predetermined period (for example, one month) has passed. It is a mode in which a determination is made and the determination is repeated every time a predetermined period elapses. As a different embodiment, for example, every day, at a predetermined time, the data of the previous day is referred to to determine whether or not the external power generation device 25 is solar power generation, and the determination is repeated every day for a predetermined period (for example, one month). After that, the final judgment may be made based on the daily judgment result of the target period.

(Embodiment 4)
It is also conceivable to determine whether or not the external power generation device is photovoltaic power generation based on the user's settings.
As shown in FIG. 1, the controller 21 is communicably connected to the user's information terminal 31, and the information terminal 31 receives the user's settings related to the control of the power control system 11. As one of the setting items, a setting is provided as to whether or not the external power generation device 25 is solar power generation, and the user is asked to set it.

FIG. 6 is an explanatory diagram showing an example of a setting screen displayed on the information terminal 31 in this embodiment. As shown in FIG. 6, the setting screen 33 allows the user to select one of the economic promotion mode, the self-produced self-extinguishing mode, and the predictive control mode as the charge / discharge control mode of the storage battery 15 using the weather information. Is. When selecting the predictive control mode, if there is external power generation of solar power generation, there is a setting item to turn on by checking the check box. Whether or not this setting item is on determines whether or not the external power generation device, if any, is solar power generation.
As described above, in this embodiment, the external power generation determination unit 103 determines the power generation method based on the information regarding the power generation method of the external power generation device 25.
In this embodiment, the user is asked to set information on the power generation method of the external power generation device 25, but the external power generation determination unit 103 causes the external power generation device 25 to set the information regarding the power generation method of the external power generation device 25 by communication between the solar power generation system and the external power generation system. You may obtain information about the power generation method of.

As the charge / discharge control mode of the storage battery 15 using the weather information, a mode different from the above-mentioned predictive control mode may be set. Here, the predictive control mode and another mode are briefly described assuming that the unit purchase price is divided into three stages: a cheap midnight power time zone, a slightly expensive morning and evening time zone, and a relatively expensive daytime time zone. ..
In the economic promotion mode, for example, the storage battery 15 is fully charged during the midnight power time zone from the night before, and the battery is discharged during the power purchase other than the midnight power time zone, and the discharge start time is adjusted to the weather condition of the day. It is a mode to adjust. If daytime solar power generation cannot be expected due to cloudy weather or rain, the storage battery 15 is not discharged in the morning time zone and is delayed until the daytime time zone to suppress expensive power purchase during the daytime.

In the self-produced self-extinguishing mode, the storage battery 15 is not charged during the midnight power hours from the night before on a sunny day, but the storage battery 15 is charged with the surplus power of the photovoltaic power generation on that day, and it is cloudy or rainy during the day. If the photovoltaic power generation cannot be expected, the mode is to charge the storage battery 15 to a predetermined capacity during the midnight power time zone from the night before. However, the predetermined capacity for charging the storage battery 15 in the midnight power time zone in this mode is determined based on statistical data. It is not determined based on the actual values of the past generated power and power consumption of the power control system 11 associated with the weather conditions. In that respect, it differs from the predictive control mode.

As mentioned above,
(I) The power control device according to the present invention is a power control device of a solar power generation system that supplies power to a power load, and an external power generation device supplies power to the power load in addition to the solar power generation system. In this case, it is characterized by including an external power generation determination unit that acquires information about the external power generation device and determines whether or not the external power generation device is solar power generation.

In the present invention, the external power generation device is a power generation device that is not under the control of the control device of the photovoltaic power generation system. A specific embodiment of the external power generation device is, for example, a solar power generation device having specifications different from those of the solar power generation device under its own control or whose specifications are unknown. Another example is a power generation device of a type different from that of photovoltaic power generation (typically, a household fuel cell).

In a different aspect, the present invention comprises a power control system connected to a power system including a solar power generation device, a power storage device, and an external power generation device that supplies power to the power load in addition to the power generation device. Power between the solar power generation device, the power storage device, the power load, and the power system based on the judgment of the external power generation determination unit that determines whether the power generation device is solar power generation and the external power generation determination unit. The power adjusting unit is provided with a power adjusting unit for adjusting the exchange and charging / discharging of the power storage device, and the power adjusting unit cannot control the external power generation device when the external power generation device is included, but the external power generation determining unit. Is characterized in that information regarding the generated power of the external power generation device can be acquired.

The external power generation determination unit can acquire information regarding the power generation of the external power generation device, and for example, can acquire the power generation value of the external power generation device. As for the generated power value of the external power generation device, for example, as described in the above-described embodiment, individual power information may be acquired from a converter or the like connected to the external power generation device. Alternatively, a power sensor (or current sensor) may be installed in the line from the transducer to the power system to acquire power information for the external power generator alone. Alternatively, the external power generation determination unit can acquire power information transmitted to and received from a solar power generation device other than the external power generation device, a power storage device, power of a power load, and a power system, and the power generation value of the external power generation device is obtained from the power information. May be calculated.

The external power generation determination unit and the power adjustment unit may be composed of hardware resources, for example, a circuit including a memory, an input / output interface circuit, a communication interface circuit, and the like centering on a CPU. Then, the external power generation determination unit and the power adjustment unit may be realized by the CPU executing a control program stored in advance in the memory. According to this aspect, the hardware resource and the software resource are organically combined to realize the functions of the external power generation determination unit and the power adjustment unit.

Further, preferred embodiments of the present invention will be described.
(Ii) The external power generation determination unit acquires time-series data of the power generated by the external power generation device over a certain period and time-series data of the power generated by the photovoltaic power generation device during that period, and both time-series. If the data has a correlation equal to or higher than a predetermined standard, it may be determined that the external power generation device is photovoltaic power generation, and if the data has a correlation smaller than the criterion, it may be determined that the external power generation device is not photovoltaic power generation.
By doing so, it is possible to determine whether or not the external power generation device is photovoltaic power generation by determining whether or not the generated power of the external power generation device and the solar power generation device has a correlation of a predetermined reference or more.

(Iii) The external power generation determination unit is based on the correlation coefficient between the daily time-series data of the power generated by the photovoltaic power generation device and the daily time-series data of the power generated by the external power generation device over the period. If the number of days determined to be photovoltaic power generation during the period is a predetermined threshold or more, it may be determined that the external power generation device is photovoltaic power generation.
By doing so, it is statistically determined whether or not the correlation coefficient calculated by calculating the daily power generation power of the photovoltaic power generation device and the daily power generation power of the external power generation device is equal to or higher than the threshold value. It is possible to accurately determine whether or not the external power generation device is photovoltaic power generation.

(Iv) The external power generation determination unit may accept settings by at least one of the period and the threshold value by the user.
In this way, the user can set at least one of a period and a threshold suitable for the power control system.

(V) The external power generation determination unit acquires time-series data of the power generated by the external power generation device over a certain period of time, and changes with the passage of time of the generated power when the external power generation device is generating power. If it is within the predetermined range, it may be determined that the external power generation device is not photovoltaic power generation.
In this way, it is possible to determine whether or not the external power generation device is photovoltaic power generation based on whether or not the generated power is constant or fluctuating while the external power generation device is generating power.

(Vi) The external power generation determination unit may accept settings by at least one of the period and the range.
In this way, the user can set at least one of the suitable periods and ranges for the power control system.

(Vii) The external power generation determination unit acquires time-series data of the power generated by the external power generation device over a certain period and time-series data of the power consumption of the power load during that period, and the magnitude of the difference between the two. If is larger than a predetermined threshold value, it may be determined that the external power generation device is photovoltaic power generation, and if the difference between the two is greater than or equal to the threshold value, it may be determined that the external power generation device is not photovoltaic power generation.
In this way, the external power generation device is based on whether the generated power of the external power generation device changes independently of the power consumption of the power load (depending on the sunshine) or changes in accordance with the power consumption. It can be determined whether or not the power generation device is photovoltaic power generation.

(Viii) The external power generation determination unit is based on the magnitude of the difference between the daily time-series data of the power generated by the external power generation device and the daily time-series data of the power consumption of the power load over the period. When the determination is made and the number of days when the difference between the two is determined to be larger than the threshold value is equal to or greater than the predetermined first reference value, it is assumed that the external power generation device is photovoltaic power generation, and the number of days is the first. If it is determined that the value is less than one reference value, it may not be solar power generation.
By doing so, it is determined on a daily basis whether or not the generated power of the external power generation device changes according to the power consumption of the power load, and by statistically looking at the daily determination, the external power generation device is set to the sun. Whether or not it is photovoltaic power generation can be accurately determined.

(Ix) The external power generation determination unit may accept settings by at least one of the period, the threshold value, and the first reference value.
In this way, the user can set at least one of a period, a threshold value and a first reference value suitable for the power control system.

(X) The external power generation determination unit acquires time-series data of the generated power of the external power generation device during the period of receiving power from the power system, and the external when receiving power from the power system. When the magnitude of the change in the generated power of the power generation device with the passage of time is out of the predetermined range, it is determined that the external power generation device is photovoltaic power generation, and the magnitude of the change is within the above range. May be determined not to be photovoltaic.
In this way, it is possible to determine whether or not the external power generation device is photovoltaic power generation based on whether or not the generated power of the external power generation device when receiving power from the power system is fluctuating or constant.

(Xi) The external power generation determination unit determines the magnitude of the change with the passage of time of the generated power of the external power generation device when the power is supplied from the power system, and the magnitude of the change. If the number of days determined to be out of the range is equal to or greater than a predetermined second reference value, it is determined that the external power generation device is photovoltaic power generation, and if the number of days is less than the second reference value, solar power is generated. It may be determined that it is not power generation.
By doing so, it is determined on a daily basis whether the generated power of the external power generation device when receiving power from the power system is fluctuating or constant, and the daily determination is statistically viewed to the outside. It is possible to accurately determine whether or not the power generation device is photovoltaic power generation.

(Xii) The external power generation determination unit may accept settings by at least one of the period, the range, and the second reference value.
In this way, the user can set at least one of a period, a range and a second reference value suitable for the power control system.
(Xiii) The photovoltaic power generation system includes a power storage device, and the power control device predicts the amount of power generated by the external power generation device based on the determination result, and controls charging / discharging of the power storage device. May be provided.
By doing so, it is possible to specify whether or not the external power generation device is photovoltaic power generation, and to realize appropriate charge / discharge control of the power storage device.

(Xiv) The power adjustment unit acquires weather information, and future power generation based on the history of power consumption and power generation related to the solar power generation system, the history of power generation of the external power generation device, and the acquired weather information. The power consumption may be predicted, and the charging / discharging of the power storage device may be controlled based on the prediction.
In this way, it is possible to identify whether or not the external power generation device is solar power generation, and accurately predict the generated power and power consumption, and thus the surplus power, by using the power consumption and the history of power generation and the weather information. It is possible to realize appropriate charge / discharge control of the power storage device.

(Xv) A preferred embodiment of the present invention is a power control device for a photovoltaic power generation system that supplies power to a power load, when an external power generation device supplies power to the power load in addition to the photovoltaic power generation system. The computer includes a power control method including a step of acquiring information about the external power generation device and a determination step of determining whether or not the external power generation device is photovoltaic power generation.

Further, in another embodiment, when the power control system connected to the power system includes a photovoltaic power generation device, a power storage device, and an external power generation device that supplies power to the power load in addition to the power load. The step of acquiring information on the generated power of the external power generation device, the determination step of determining whether or not the external power generation device is photovoltaic power generation based on the acquired information, and the photovoltaic power generation based on the determination of the determination step. It includes a power generation adjusting method including an adjustment step for adjusting the exchange of power between the device, the power storage device, the power load and the power system, and charging / discharging of the power storage device.

Preferred embodiments of the present invention include a combination of any of the plurality of embodiments described above.
In addition to the embodiments described above, there may be various variations of the present invention. These variations should not be construed as not belonging to the scope of the present invention. The invention should include claims and equivalent meaning and all modifications within said scope.

11: Power control system, 13: Photovoltaic power generation device, 15: Storage battery, 17-1, 17-n: Power load, 19: Power conditioner, 19a, 19b: DC / DC converter, 19c: Bidirectional inverter, 21 : Controller, 23: Power system, 25: External power generation device, 27: Converter, 31: Information terminal, 33: Setting screen 97: Server, 98: Network, 101: Power generation / consumption history, 103: External power generation judgment unit, 105: Power adjustment unit

Claims (10)

It is a power control device for a photovoltaic power generation system that supplies power to a power load.
When an external power generation device supplies power to the power load in addition to the photovoltaic power generation system, information about the external power generation device is acquired, and an external power generation determination for determining whether or not the external power generation device is photovoltaic power generation is determined. A power control device equipped with a unit. The external power generation determination unit acquires time-series data of the power generated by the external power generation device over a certain period and time-series data of the power generated by the photovoltaic power generation device included in the photovoltaic power generation system during that period. A claim that it is determined that the external power generation device is photovoltaic power generation when the time series data of both have a correlation equal to or higher than a predetermined standard, and it is determined that the external power generation device is not photovoltaic power generation when the correlation is smaller than the standard. The power control device according to 1. The external power generation determination unit acquires time-series data of the generated power of the external power generation device over a certain period, and changes with the passage of time of the generated power when the external power generation device is generating power are predetermined. The power control device according to claim 1, wherein if the power generation device is within the above range, it is determined that the external power generation device is not solar power generation. The external power generation determination unit acquires time-series data of the power generated by the external power generation device over a certain period and time-series data of the power consumption of the power load during that period, and the magnitude of the difference between the two is predetermined. The power control device according to claim 1, wherein the external power generation device is considered to be photovoltaic power generation when it is larger than the specified threshold value, and is not photovoltaic power generation when the magnitude of the difference between the two is equal to or less than the threshold value. The external power generation determination unit acquires time-series data of the generated power of the external power generation device during the period when the power is supplied from the power system, and the external power generation device when the power is supplied from the power system. When the magnitude of the change with the passage of time of the generated power is out of the predetermined range, it is determined that the external power generation device is solar power generation, and when the magnitude of the change is within the range, the solar power is generated. The power adjusting device according to claim 1, wherein it is determined that the power generation is not generated. The power control device according to claim 1, wherein the external power generation determination unit receives a user's setting regarding a power generation method of the external power generation device, and determines whether or not the external power generation device is photovoltaic power generation based on the accepted setting. .. The photovoltaic power generation system includes a power storage device and includes a power storage device.
The power according to any one of claims 1 to 6, wherein the power control device includes a power adjusting unit that predicts the amount of power generated by the external power generation device based on the determination result and controls charging / discharging of the power storage device. Control device. The power adjustment unit acquires weather information, and future power generation and power consumption based on the power consumption and power generation history of the solar power generation system, the power generation history of the external power generation device, and the acquired weather information. The power control device according to claim 7, wherein the power generation device is predicted and the charging / discharging of the power storage device is controlled based on the prediction. The seventh aspect of claim 7, wherein the power adjustment unit adjusts the charge amount of the power storage device during a time period when the unit price of electricity of the power system is low, based on the power generation amount prediction of the solar power generation system and the external power generation device. Power control device.
A power control device for a solar power generation system that supplies power to a power load, when an external power generation device supplies power to the power load in addition to the solar power generation system.
The computer
The step of acquiring information about the external power generation device and
A power control method comprising a determination step for determining whether or not the external power generation device is solar power generation.

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