JP2006094649A - Power generation planning method and power generation planning apparatus using secondary battery - Google Patents

Abstract

To develop a power generation plan that uses the capacity of a secondary battery and suppresses fuel cost more than before.
The present invention is a method for creating a power generation plan for power to be supplied to a power system 10 including control of a secondary battery 20 provided on a consumer side, and estimating total demand power. Calculating the fixed power by the fixed power generators 17 and 18, calculating the variable power that can be generated by the variable power generator 16 within the constraints satisfying the predetermined economic conditions, and the fixed power and the fluctuation Subtracting the sum of power from the total demand power, calculating the total power shared by the secondary battery, and the current charge amount of each secondary battery and the operation schedule. Calculation of the individual shared power each of the secondary batteries 20 shares, determining a new operation schedule or charge / discharge amount of each secondary battery based on the individual shared power, and the determined new operation schedule or charge Release And a controlling the respective secondary batteries based on the amount.
[Selection] Figure 2

Description

  The present invention relates to a power generation planning method and a power generation planning apparatus for planning a power generation plan for power supplied to a power system in consideration of a secondary battery provided on a customer side.

  A secondary battery introduced by a consumer is controlled and operated on the consumer side in accordance with the purpose of introduction. Therefore, only the information in the customer premises is taken in, and the secondary battery is controlled based on the information to realize the introduction purpose. Therefore, in view of the capacity of the secondary battery, there is a possibility that it can sufficiently contribute to other purposes. The basic functions of the conventional secondary battery will be described below.

(1. Basic functions)
In general, an electricity price contract between an electric power company and a consumer is contracted with contract electric power that does not exceed the maximum demand of the customer throughout the year. On the other hand, if the power is received exceeding the maximum contract power, an additional fee is collected as a penalty. Therefore, when a consumer introduces a secondary battery to curb the electricity bill, the maximum power is suppressed so as not to exceed the contracted power so that an extra penalty is not collected, and load leveling is attempted. It is conceivable to reduce the contract power itself to make a cheap contract, and to sell the secondary battery power to the power company to make a profit.

(1.1 Function to control the maximum demand of consumers)
The customer contracts with the electric power company at a value (contract power) that exceeds the annual maximum demand (peak). When demand exceeds the contracted power, a penalty (extra charge) is collected from the power company.

In FIG. 10, the example of the daily demand curve in a consumer is shown. The consumer determines the contract power F with the power company so that the maximum demand D _max does not exceed the contract power throughout the year. However, as shown in FIG. 11, when the maximum demand _Dmax exceeds the contracted power F due to equipment enhancement or the like, a penalty (extra charge) is collected from the electric power company, so that the electricity charge increases. FIG. 12 shows a control method of the secondary battery. The control device 2 that controls the secondary battery 1 connected in parallel with the loads L1 to Ln takes in the power transmitted to the power receiving end 3 through the distribution system 5, performs comparison with the set reference power, When the secondary battery 1 is controlled according to the operation schedule as shown in FIG. 13, the demand D can be controlled so as not to exceed the contract power F even in the same equipment situation as shown in FIG.

  However, as shown in FIG. 13, in general, the secondary battery 1 tends to be discharged during a daytime high demand period, and as a whole, the energy held by the secondary battery 1 itself remains sufficiently. There are often.

(1.2 Customer load leveling function)
The customer contracts with the electric power company with the contract power F that exceeds the annual maximum demand (peak), but generally, the lower the contract power F, the lower the electricity bill. Therefore, if the maximum power can be reduced throughout the year, the contracted power F can be lowered to reduce the electricity bill. In addition, the electricity charges differ according to the time of day, and in general, the daytime is high and the nighttime is inexpensive. Therefore, even if the same electricity is used, it is possible to further reduce the electricity bill by using it at night and suppressing the use during the day.

In this case, the control device 2 shown in FIG. 12 starts charging at a time when the electricity charge becomes cheap, stops charging at a time when the electricity charge becomes high, and detects the power of the power receiving end 3, By starting the discharge when the set power is exceeded, the output of the secondary battery 1 is obtained as shown in FIG. 15, and load leveling can be realized even in the same equipment situation as shown in FIG. Thus, the contract power can be reduced from the old contract power F _old to the new contract power F _new and the daytime power can be suppressed.

  However, as shown in FIG. 15, in general, the secondary battery 1 does not operate for a certain period of time, and the energy held by the secondary battery 1 itself remains. Moreover, although the output ratio characteristic with respect to the operation time of the secondary battery 1 is shown in FIG. 17, even if the secondary battery 1 is used in the operation pattern as shown in FIG. It turns out that it can be used effectively.

(1.3 Power selling function for power suppliers)
The purpose of the consumer who introduces the secondary battery 1 is various in addition to the function of suppressing the maximum demand _Dmax and the load leveling function of the consumer. However, there are many cases where the original capacity of the secondary battery 1 as shown in FIGS. 13 and 17 is not used up.

  Therefore, in addition to the unused portion of the secondary battery 1 as shown in FIG. 18, the short-time high output capability of the secondary battery 1 as shown in FIG. It is thought that merit can be obtained.

(2. Basic power distribution facilities)
The power system is generally configured as shown in FIG. 19, and electricity is produced by a generator such as a thermal power generator 16, a hydroelectric power generator 17, a nuclear power generator 18, and the like. It is transported and distributed by the electric wire 27. And it is a distribution channel that is consumed by consumers.

(2.1 Features of the power system)
An electric power system is a system that converts heat energy and kinetic energy into electric energy, and transports, distributes, and consumes it. Unlike other energy supply systems, electric energy cannot be stored, so changes in consumption. Therefore, it is necessary to control the production volume so as to match both the quantity and time.

  Electricity is indispensable in social activities and production activities. The power system that produces, transports, distributes and consumes this electricity has less frequency fluctuations, less voltage fluctuations, and fewer power outages. There is a social mission to supply high-quality electricity economically. In order to fulfill this mission, it is important to grasp the entire power system and control it optimally, as well as controlling individual components such as generators, substations, and distribution systems. It is necessary to harmonize with.

(2.2 Power generation plan)
Next, a power generation plan method or a corresponding method for the power system will be described.

  The power generation plan is a function for creating a plan for generating power most economically within the constraint conditions of the thermal power generator 16, the hydroelectric power generator 17, and the nuclear power generator 18.

  It is necessary to control production (power generation) according to changes in consumption (demand), which is also a feature of the power system, but it is not possible to control generator output (nuclear power, self-current hydropower, etc.) There are constraints (minimum / maximum output, rate of change, etc.), and it is necessary to operate the generator economically under those conditions.

In the power generation plan of the power system with the above characteristics, the fixed power output (nuclear power, self-current hydropower, etc.) curve is subtracted from the expected total demand curve of the next day, and then hydropower is generated by pumping and storing water at peak times. The share curve of the thermal power generator is created by subtracting the share curve that takes the output from the generator and making the share curve of the thermal power generator as flat as possible. Thermal power generators create output schedules based on the shared curve based on the economic load distribution represented by the equal λ method, but in general, the most advanced machines with good generator efficiency and large change speed are installed first. Therefore, at the peak, only generators with low generator efficiency and low change rate remain, and it is often impossible to ensure a supply-demand balance. For this reason, power generation plans are created while sacrificing economic efficiency to some extent by setting various constraints.
JP 2003-243017 A JP 2003-259696 A

  As described above, the secondary battery 1 that has been installed by customers in the past does not always use up all of the capacity of the secondary battery 1, leaving a surplus. It is considered that the fuel cost of the generator can be suppressed more than before by utilizing the remaining capacity of the secondary battery 1 to contribute to the efficient operation of the generator.

  Patent Document 1 discloses a technique for grasping in real time the charge / discharge capability (hereinafter also referred to as “control reserve capacity”) of the secondary battery 1 on-line. Patent Document 2 discloses a technique for creating an electrical equivalent circuit model of the secondary battery 1 used for studying the use of the secondary battery 1 for the purpose of using the overload region. ing. However, there is no conventional means for capturing the operation schedule of the secondary battery 1, and no control of the electric power system that makes the best use of the capacity of the secondary battery 1 is performed.

  The present invention has been made in view of such circumstances, and a power generation planning method capable of formulating a power generation plan that suppresses the fuel cost of a generator more than before by utilizing the capacity of a secondary battery. And it aims at providing a power generation planning device.

  In order to achieve the above object, the present invention takes the following measures.

  That is, the invention of claim 1 includes control of a secondary battery that is connected to an electric power system that supplies electric power to the consumer on the consumer side that uses electric power and performs charging and discharging for the consumer. A method for creating a power generation plan for power to be supplied to the power system, including estimating the total demand power by all customers who receive power supply from the power system and generating fixed power to be supplied to the power system. Calculate the fixed power generated by the fixed power generator and the variable power generator that generates the fluctuating power supplied to the power grid and calculate the variable power that can be generated within the constraints that satisfy the specified economic conditions. Calculating the total shared power shared by the secondary battery by subtracting the sum of fixed power and variable power from the total demand power, and the current charge amount and operation schedule of each secondary battery, In Therefore, calculating the individual shared power shared by each secondary battery among the total shared power, and determining a new operation schedule or charge / discharge amount of each secondary battery based on the individual shared power, And controlling each secondary battery based on the determined new operation schedule or charge / discharge amount.

  According to a second aspect of the present invention, in the power generation planning method according to the first aspect of the present invention, the variable power generator is a thermal power generator, a secondary battery that is charged and pumped with surplus power generated by the thermal power generator, and a pumped water generator. The power generation amount of the thermal power generator is determined in consideration of the rated output or the increased capacity output of the secondary battery so as to ease restrictions on the power generation amount by the pumped-storage generator.

  According to a third aspect of the present invention, in the power generation planning method of the first aspect, even if the supply of electric power is insufficient with respect to the demand and the predetermined economic conditions are not satisfied, the variable electric power generator can generate the insufficient electric power. When it is unavoidable, at least a part of the insufficient power is allocated by generating power using the secondary battery.

  According to a fourth aspect of the present invention, in the power generation planning method according to the first aspect of the present invention, when power is generated by a variable power generator and a fixed power generator, the power generation conditions are such that predetermined economic conditions must be sacrificed. The power that must be generated will be allocated by the power generated by the secondary battery.

  According to a fifth aspect of the present invention, there is provided the power generation planning method according to the first aspect of the present invention, wherein a generator having a larger amount of carbon dioxide discharged during power generation than a predetermined value among a fixed power generator and a variable power generator. In the time zone when the secondary battery is used instead of the generator or the amount of carbon dioxide discharged during power generation is greater than the predetermined value, carbon dioxide is not generated during power generation among the fixed power generator and the variable power generator. Power is generated using a secondary battery instead of any generator to be discharged.

  According to a sixth aspect of the present invention, in the power generation planning method according to the first aspect of the present invention, the variable power generator includes: a thermal power generator; a secondary battery that performs charging and pumping with surplus power from the thermal power generator; It consists of a set, and the rated output or the increased capacity output of the secondary battery is taken into consideration so as to ease the restriction of the pumping power by the pumped-storage generator, and the margin for lowering the thermal generator at the off-peak time of power demand is secured.

  According to a seventh aspect of the present invention, in the power generation planning method according to the first aspect of the present invention, the variable power generator includes: a thermal power generator; a secondary battery that performs charging and pumping with surplus power from the thermal power generator; A first power generation schedule that relaxes the amount of power generated by a pumped-storage generator, and a generator that must generate power even if it does not satisfy a predetermined economic condition among a fixed power generator and a variable power generator, Alternatively, a second power generation schedule in a time zone in which power generation must be performed even if predetermined economic conditions are not satisfied, and a third power generation schedule based on power generation conditions in which predetermined economic conditions must be sacrificed A new operation schedule of each secondary battery that shares at least one of them is created.

  The invention of claim 8 includes a control of a secondary battery that is connected to an electric power system that supplies electric power to the consumer on the consumer side that uses electric power, and performs charging and discharging for the consumer. An apparatus for creating a power generation plan for power to be supplied to the power system, which generates an estimation means for estimating the total demand power by all consumers who receive power supply from the power system, and fixed power to be supplied to the power system Fluctuating power that can be generated within the constraints that satisfy the specified economic conditions by means of fixed power calculation that calculates the fixed power generated by the fixed power generator and the variable power generator that generates the fluctuating power supplied to the power system. A variable power calculation means for calculating the total share power shared by the secondary battery by subtracting the sum of the fixed power and the variable power from the total demand power, and each secondary battery Present Based on the amount of charge and the operation schedule, the individual shared power calculation means for calculating the individual shared power shared by each secondary battery among the total shared power, and the new of each secondary battery based on the individual shared power Charge / discharge amount determining means for determining a proper operation schedule or charge / discharge amount, and secondary battery control means for controlling each secondary battery based on the determined new operation schedule or charge / discharge amount.

  The present invention takes various information on the power system side by taking the above-described means, and is output from a chargeable / dischargeable secondary battery connected to the power system and a control device for controlling the secondary battery. Demand for secondary batteries whose output changes depending on the operation signal is reduced by suppressing the maximum demand of consumers, or by charging with electricity with low electricity charges at midnight and discharging in the daytime when electricity charges are expensive In addition to leveling, it is possible to realize various contributions to the power system side by supplying power to the power system.

  According to the power generation planning method and the power generation planning apparatus of the present invention, it is possible to devise a power generation plan that suppresses the fuel cost of the generator more than before by utilizing the capacity of the secondary battery.

  The best mode for carrying out the present invention will be described below with reference to the drawings.

  In addition, the code | symbol in the figure used for description of each following embodiment attaches | subjects and shows the same code | symbol about the same part as FIG.12 and FIG.19.

(First embodiment)
The power generation planning method according to the first embodiment of the present invention is provided on the consumer side that uses electric power, connected to an electric power system that supplies electric power to the consumer, and performs charging and discharging for the consumer. This is a method for creating a power generation plan for power to be supplied to the power system, including control of the secondary battery. A block diagram showing a configuration example of a power system to which such a power generation planning method is applied is shown in FIG.

  As shown in FIG. 1, in the power system to which the power generation planning method according to the present embodiment is applied, power is transmitted from the thermal power generator 16, the hydroelectric power generator 17, and the nuclear power generator 18 through the transmission line 60. The secondary batteries 21 to 24 are dispersedly arranged in the facility premises of the primary or secondary distribution substations 11 to 15 and the customers 62 to 64 that are further distributed by the distribution lines 27 therefrom. The distribution line 27 is provided with a switch 25 and a section switch 26 as appropriate.

  A communication means is provided at a place where each of the secondary batteries 21 to 24 is installed with a control station such as a central power supply system (hereinafter referred to as “medium supply system”) (not shown). In response to the adjustment signal, the output adjustment for each location is performed to contribute to the power system. Moreover, about the consumers 61-64, it is also possible to transmit / receive information by using communication means, such as an optical fiber cable which the electric power company has installed.

  FIG. 2 is a detailed block diagram for explaining a control method of the secondary battery in the power system as described above.

  That is, each secondary battery 20 provided in a customer or the like is controlled based on a command from the mid-supply system 30 that controls the power system 10 via the secondary battery control system 40 provided individually. The The mid-supply system 30 includes a power generation plan function 31 such as a next day power generation plan, and the power generation plan function 31 creates a power generation schedule for the generators 16, 17, and 18.

  Further, a breaker 41, a detector 42, and a DC / AC converter 43 are further arranged on the premises of each customer, and the detector 42 measures a voltage and a current at a connection point with the power system 10. Then, when the measurement result is given to the secondary battery control system 40, when an abnormality due to a grid fault is detected, the circuit breaker 41 is opened, and the customer's premises equipment is disconnected from the power system 10. The secondary battery control system 40 controls the DC / AC converter 43 to charge or discharge the secondary battery 20 in accordance with an operation schedule registered in advance or a system state fetched from the detector 42. Thereby, load leveling to the loads L1 to L3 on the customer side is performed.

  Next, operation | movement of the electric power generation plan function 31 of the mid-supply system 30 comprised as mentioned above is demonstrated using the flowchart shown in FIG.

  That is, FIG. 3 is a process flowchart showing a control method for the secondary battery for the purpose of suppressing the fuel cost of the generator in the power generation planning function 31.

First, in step SP01, the power generation planning function 31 takes in the estimated total demand of the power system 10 monitored and controlled by the mid-supply system 30 (SP01). In step SP02, the charge amount and the operation schedule of the secondary battery 20 connected to the power system 10 monitored and controlled by the mid-supply system 30 are captured (SP02). Then, from the charge amount and the operation schedule taken in step SP02, the power generation possible amount is calculated according to the following equation (1).
(Electrical power generation amount) = (charge amount) − (operation schedule power generation amount) Expression (1).

  Next, a pumping / thermal power sharing curve is created by subtracting fixed power generation (nuclear power, self-current hydroelectric power generation, etc.) based on the predicted total demand captured in step SP01 (SP04).

  In this way, the economic load distribution of pumped-storage generators and thermal power generators is made based on the pumping / thermal power sharing curve, and a power generation schedule is created. The amount of control, the upper and lower limits of the generator output, the rate of change, etc.), the generator schedule must be created at the expense of economy. Is created, and economic load distribution is performed on the remaining share as a secondary battery share curve (SP05).

  Further, secondary battery allocation calculation is performed for assigning the secondary batteries 20 to the secondary battery sharing curve based on the power generation possible amount of the secondary batteries 20 captured in step SP03 (SP06). FIG. 4 shows a flowchart describing detailed processing of such secondary battery allocation calculation.

  That is, when performing the secondary battery distribution calculation, a secondary battery with a large daily amount among the secondary batteries that have no time constraints on the discharge based on the daily power generation possible amount of the secondary battery 20 taken in step SP03. Are assigned in order to the time zone of the secondary battery sharing curve with the rated output in order, and the assigned result is reflected in the schedule of the secondary battery (SP06a). If the assignment to the secondary battery sharing curve is completed at this stage, the secondary battery allocation calculation is completed (SP06b: Yes).

  On the other hand, in step SP06b, when the assignment to the secondary battery sharing curve is not completed (SP06b: No), next, among the secondary batteries that can be discharged in the time zone of the secondary battery sharing curve, The secondary batteries are assigned to the secondary battery sharing curve at the rated output in order from the largest daily quantity, and the assigned result is reflected in the schedule of the secondary battery (SP06c). If the allocation to the secondary battery sharing curve is completed at this stage, the secondary battery allocation calculation is completed (SP06d: Yes).

On the other hand, in step SP06d, if the assignment to the secondary battery sharing curve is not completed (SP06d: No), finally, using the following formulas (2) to (5), all the secondary batteries On the other hand, the secondary battery is assigned to the secondary battery sharing curve at the n times rated output in descending order of the daily amount. At this stage, since the customer is scheduled to use the secondary battery, the output is (n−1) × rated and the power generation possible time is as follows (SP06e).
(Daily amount) / {(n−1) × rated output} <(power generation possible time at n times rating) (2)
(Power generation possible time) = (Power generation possible time at n times rating) Formula (3)
(Daily amount) / {(n-1) × rated output}> (power generation possible time at n times rating) Expression (4)
(Power generation possible time) = (Daily amount) / {(n−1) × Rated output} (5)

  If the allocation to the secondary battery sharing curve is completed at this stage, the secondary battery allocation calculation is completed (SP06f: Yes). On the other hand, if there is a remaining distribution (SP06f: No), the process ends as a secondary battery capacity shortage.

  As a result of the secondary battery allocation calculation as described above, if the daily amount can be secured with a secondary battery capable of generating electricity (SP07: Yes), each secondary battery is output by outputting its operation schedule to each secondary battery. An output request is made for SP06 (SP06).

  On the other hand, when the daily amount cannot be secured (SP07: No), feedback is applied by returning to the processing of step SP05 so as to exclude a part of the constraint condition for the insufficient daily amount (SP08), and the target can be achieved. The processing from step SP05 to step SP07 is repeated. A generator operation plan is created by periodically operating these operations (SP10).

  As described above, according to the power generation planning method according to the present embodiment, the secondary battery 20 has conventionally created an operation schedule of the thermal power generator 16 at the expense of economy due to various constraints. By utilizing the surplus power generated and the load, it becomes possible to relax the constraint condition, and the thermal power generator 16 can be operated more efficiently than before, so that the fuel cost can be suppressed.

(Second Embodiment)
The power generation planning method according to the second embodiment of the present invention assumes that the secondary battery 20 is a virtual generator equivalent to a pumped-storage generator, and makes the sharing curve of the thermal power generator 16 flatter than that of the conventional thermal power generator. The purpose of this is to reduce the fuel cost of the thermal power generator 16 by operating the engine 16 efficiently. Such a power generation planning method is made by a power generation planning function 31 of the mid-supply system 30 as shown in FIG. 2 as in the first embodiment. Therefore, here, the operation of the power generation planning function 31 will be described using the flowchart shown in FIG. 5 with respect to differences from the first embodiment. In the flowchart of FIG. 5, the same step numbers are assigned to the portions that perform the same processing as the step numbers shown in the flowchart of FIG. 3.

  First, by assuming that the secondary battery 20 is a virtual generator equivalent to a pumped-storage generator by the power generation planning function 31, the sharing curve of the thermal power generator 16 is made flatter than before, and the thermal power generator 16 is operated efficiently. When the control for the purpose of suppressing the fuel cost of the thermal power generator 16 is performed, the estimated total demand of the power system 10 monitored and controlled by the mid-supply system 30 is taken in similarly to the process shown in the flowchart of FIG. (SP01). Further, the charging amount and operation schedule of the secondary battery 20 connected to the power system 10 monitored and controlled by the mid-supply system 30 are captured (SP02). Furthermore, the amount of power generation possible is calculated from the charge amount taken in at step SP02 and the operation schedule (SP03). Then, based on the predicted total demand captured in step SP01, a pumping / thermal power sharing curve is created (SP04) by subtracting the fixed power generation (nuclear power, self-current hydroelectric power generation, etc.). Then, in order to flatten the sharing curve of the thermal power generator 16, a lifting moisture sharing curve is first created so as to take the load in the load peak zone by the pumped-storage generator (SP05).

  As a result, the remaining share becomes the share curve of the thermal power generator 16. In order to further flatten the share curve, the secondary battery 20 is assumed to be a virtual generator equivalent to the pumped water generator. Create a shared share curve. Specifically, a sharing curve required to lower the unit kW (SP22) by the peak kW of the thermal power generator sharing curve is created (SP23), and the daily amount of the sharing curve is calculated ( SP24).

  Then, the daily amount of the sharing curve calculated in step SP24 is compared with the secondary battery power generation possible amount calculated in step SP03, and if the secondary battery power generation possible amount is larger (SP25: Yes), step SP22 is performed. Then, the unit kW is further lowered, and the processing from step SP22 to step SP25 is repeated until the daily amount of the sharing curve becomes equal to or larger than the secondary battery power generation possible amount.

  As a result, the calculated sharing curve (SP25: No) becomes a secondary battery sharing curve, and secondary battery allocation calculation is performed on this secondary battery sharing curve (SP06). And if the amount of the day can be secured with the secondary battery capable of generating electricity (SP07: Yes), the amount of the day is pasted as a load in the midnight zone, and the thermal power sharing curve is calculated (SP27). Thermal power economic load distribution is performed on the thermal power sharing curve (SP28). And the output request | requirement is performed with respect to each secondary battery by outputting the operation schedule of the secondary battery determined above to each secondary battery (SP11).

  On the other hand, when the daily amount cannot be secured (SP07: No), feedback is returned to the processing of step SP22 so as to exclude a part of the constraint condition for the insufficient daily amount (SP26), and the target can be achieved. The processes from step SP22 to step SP07 are repeated. By periodically operating these operations (SP12), a generator operation plan is created.

  As described above, according to the power generation planning method according to the present embodiment, the peak time zone was conventionally shared only by the pumping and the reservoir generator, but the surplus power generated by the secondary battery 20 should be utilized. As a result, the thermal power sharing curve in the peak time zone becomes flatter than before. As a result, the output constant operation time of the thermal power generator 16 is expanded, and the thermal power generator 16 can be operated efficiently, so that the fuel cost can be suppressed.

(Third embodiment)
The power generation planning method according to the third exemplary embodiment of the present invention uses the power generation planning function 31 to replace the secondary battery 20 with a generator schedule with poor operating efficiency or a power generation amount during times with low operating efficiency. The secondary battery is controlled for the purpose of suppressing the fuel cost of the thermal power generator 16. Such a power generation planning method is made by a power generation planning function 31 of the mid-supply system 30 as shown in FIG. 2 as in the first embodiment. Therefore, here, the difference between the operation of the power generation planning function 31 and the first embodiment will be described using the flowchart shown in FIG. In the flowchart of FIG. 6, the same step numbers are assigned to the portions that perform the same processing as the step numbers shown in the flowcharts of FIGS. 3 and 5.

  First, the power generation plan function 31 is intended to suppress the fuel cost of the thermal power generator 16 by substituting the secondary battery 20 for a generator schedule with poor operating efficiency or a power generation amount during times with poor operating efficiency. In the case of performing the control, the estimated total demand of the power system 10 monitored and controlled by the mid-supply system 30 is taken in similarly to the processing shown in the flowchart of FIG. 3 (SP01). Further, the charging amount and the operation schedule of the secondary battery 20 connected to the power system 10 monitored and controlled by the mid-supply system 30 are taken in (SP02). Furthermore, the amount of power generation possible is calculated from the charge amount taken in at step SP02 and the operation schedule (SP03). Then, based on the estimated total demand captured in step SP01, a pumping / thermal power sharing curve is created by subtracting the fixed generation (nuclear power, self-current hydropower generation, etc.) (SP04). In order to flatten the sharing curve of the thermal power generator 16, a lifting moisture sharing curve is first created so as to take the load in the load peak zone by the pumped-storage generator (SP05). This remaining share becomes a thermal generator share curve.

  Thermal power economic load distribution calculation is performed on this thermal power sharing part curve (SP30), and the operation schedule of the generator with the lowest power generation efficiency is set as a secondary battery sharing curve (SP31). If the secondary battery allocation calculation is performed for the secondary battery share curve (SP06), and the amount of the secondary battery 20 capable of generating power can be secured (SP07: Yes), the daily amount is loaded into the midnight zone. To calculate the thermal power sharing curve (SP27). Further, thermal economic load distribution is performed on the thermal power sharing curve except for the generator replaced with the secondary battery 20 (SP33). And the output request | requirement is performed with respect to each secondary battery by outputting the operation schedule of the secondary battery determined above to each secondary battery (SP11).

  On the other hand, when the daily amount cannot be secured (SP07: No), the secondary battery share curve is re-created so that the flat operation is performed in increments of unit steps from the lowest output of the generator with the lowest power generation efficiency. Feedback is applied (SP32), and the processing from step SP06 to step SP07 is repeated until the target is achieved. By periodically operating these operations (SP12), a generator operation plan is created.

  As described above, according to the power generation planning method according to the present embodiment, power generation with poor power generation efficiency is achieved by replacing the generator with poor power generation efficiency by utilizing surplus power generated by the secondary battery 20. It is not necessary to operate the machine, and the fuel cost can be reduced.

(Fourth embodiment)
The power generation planning method according to the fourth embodiment of the present invention uses the power generation planning function 31 to operate the secondary battery 20 so as to relax the constraint conditions of the thermal power generator 16, thereby reducing the fuel of the thermal power generator 16. The secondary battery is controlled for the purpose of reducing the cost. Such a power generation planning method is made by a power generation planning function 31 of the mid-supply system 30 as shown in FIG. 2 as in the first embodiment. Therefore, here, the operation of the power generation planning function 31 will be described with reference to the flowchart shown in FIG. 7 with respect to differences from the first embodiment. Note that there are a wide variety of constraints on the thermal power generator 16, and among them, the change rate constraint on the generator is shown as an example. In the flowchart of FIG. 7, the same step numbers are assigned to the portions that perform the same processing as the step numbers shown in the flowcharts of FIGS. 3, 5, and 6.

  First, when the control for the purpose of suppressing the fuel cost of the thermal power generator 16 is performed by operating the secondary battery 20 so as to relax the constraints of the thermal power generator 16 by the power generation planning function 31. In the same manner as the process shown in the flowchart of FIG. 3, the estimated total demand of the power system 10 monitored and controlled by the mid-supply system 30 is captured (SP01). Further, the charging amount and operation schedule of the secondary battery 20 connected to the power system 10 monitored and controlled by the mid-supply system 30 are captured (SP02). Furthermore, the amount of power generation possible is calculated from the charge amount taken in at step SP02 and the operation schedule (SP03). Then, based on the estimated total demand captured in step SP01, a pumping / thermal power sharing curve is created by subtracting the fixed generation (nuclear power, self-current hydropower generation, etc.) (SP04). In order to flatten the sharing curve of the thermal power generator 16, a lifting moisture sharing curve is first created so as to take the load in the load peak zone by the pumped-storage generator (SP05). This remaining share becomes a thermal generator share curve.

  By implementing kWH economic load distribution that relaxes the change rate constraint condition of the thermal power generator with respect to the thermal power sharing curve, a kWH balance considering economic efficiency can be achieved (SP41). On the other hand, the speed of change of the generator is important in order to achieve kW balance. However, for the kW balance generator operation plan created earlier, distribution of the thermal power distribution curve is considered in consideration of the speed of change. Implement (SP42). At this time, a portion where the kW balance cannot be achieved due to the change rate is generated, so a secondary battery sharing curve is created so that the portion is complemented by the secondary battery (SP43). Thereafter, as a result of carrying out the secondary battery distribution calculation (SP06), if the daily amount can be secured with the secondary battery 20 capable of generating power (SP07: Yes), the daily amount is pasted as a load at midnight, and the thermal power sharing curve Is calculated (SP27). Furthermore, the thermal power load distribution which complemented the generator change speed with the secondary battery 20 is implemented with respect to the thermal power share curve (SP45). And the output request | requirement is performed with respect to each secondary battery by outputting the thermal-power economical load distribution implemented by step SP45 to each secondary battery (SP11).

  On the other hand, when the daily amount cannot be secured (SP07: No), the feedback that excludes the condition relaxation target from the generator with the fastest change speed among the generators with the change speed restriction is applied (SP44), and the target Until the above is achieved, the processing from step SP41 to step SP07 is repeated. By periodically operating these operations (SP12), a generator operation plan is created.

  As described above, according to the power generation planning method according to the present embodiment, conventionally, an operation schedule of the thermal power generator 16 has been created at the expense of economy due to the load following restriction of the thermal power generator 16. By sharing the unbalanced supply and demand due to the relaxation of the constraints on the economic load distribution result with the surplus power generated by the secondary battery 20, the thermal power generator 16 can be operated more efficiently than before. Thus, the fuel cost can be suppressed.

(Fifth embodiment)
The power generation planning method according to the fifth embodiment of the present invention uses the power generation planning function 31 to replace the secondary battery 20 with a generator schedule with a large amount of carbon dioxide emissions or a power generation amount with a large amount of carbon dioxide emissions. By doing so, carbon dioxide emissions are suppressed.

  In such a power generation planning method, as a result of the thermal economic load distribution calculation shown in step SP30 of the flowchart of FIG. 6 in the third embodiment, in step SP31, the operation schedule of the generator having the largest amount of carbon dioxide emissions is determined. By substituting with the secondary battery share curve, it becomes possible to devise a power generation plan that suppresses carbon dioxide emissions.

  As described above, according to the power generation planning method according to the present embodiment, it is possible to replace the generator that generates a large amount of carbon dioxide by utilizing the surplus generated power of the secondary battery 20. This eliminates the need to operate a generator that emits a large amount of carbon dioxide, which is effective for future measures for taxing carbon dioxide emissions.

(Sixth embodiment)
In the power generation planning method according to the sixth embodiment of the present invention, the power generation planning function 31 assumes that the secondary battery 20 is a virtual load equivalent to a pumped water generator, and the sharing curve of the thermal power generator 16 is flatter than before. To. Thereby, the thermal power generator 16 is operated efficiently, and the fuel cost of the thermal power generator 16 is suppressed.

  Such a power generation planning method is replaced with step SP31 in the flowchart of FIG. 6 in the third embodiment so as to create a shared curve necessary for raising the unit kW from the bottom kW at midnight, and further step SP27. In the above, the secondary battery charging daily amount is pasted as the amount of power generation in the peak time zone to replace the thermal power sharing curve. As a result, an extra stop of the thermal power generator 16 is reduced, and a power generation plan that suppresses the fuel cost of the thermal power generator 16 can be made.

  As described above, according to the power generation planning method according to the present embodiment, conventionally, the off-peak time period was shared only by the pumped-generator power, but by utilizing the surplus load of the secondary battery 20, It is possible to increase the power reduction margin during off-peak hours. As a result, the extra stop of the thermal power generator 16 is reduced, the thermal power generator 16 can be operated efficiently, and the fuel cost can be suppressed.

(Seventh embodiment)
A power generation planning method according to the seventh embodiment of the present invention will be described with reference to the drawings.

  FIG. 8 is a detailed block diagram for explaining a control method of the secondary battery in the power system to which the power generation planning method according to the seventh embodiment is applied. This detailed block diagram is different from the detailed block diagram shown in FIG. 2 only in that the secondary battery control system includes a power generation planning function 51. Therefore, here, the operation of the power generation planning function 51 will be described with reference to the processing flowchart shown in FIG.

  That is, in the power generation planning method according to the present embodiment, the power generation planning function 51 of the secondary battery control system 40 has the necessary secondary battery share curve, the power generation unit price, and the power generation planning function 31 of the mid-supply system 30. Is received when the mid-supply system 30 implements the power generation plan (SP61). Then, considering the request and the charge / discharge schedule (SP62) from the beginning of the secondary battery 20, a charge / discharge schedule for the secondary battery 20 is created (SP63). In addition, a surplus charge / discharge schedule is created based on the charge / discharge schedule considered in step SP62 (SP64).

  Furthermore, optimal schedule calculation is performed from the required charge / discharge schedule created in step SP63 and the surplus charge / discharge schedule created in step SP64 (SP65). Specifically, an additional charge / discharge schedule that is proportionally distributed to the required charge / discharge schedule is created for the surplus charge / discharge enable schedule of the secondary battery 20. The proportionality coefficient used for this proportional distribution is the minimum kW of the surplus charge / discharge schedule / the maximum kW of the required charge / discharge schedule. As another example, there is a method in which the surplus chargeable schedule is distributed by weighting the required charge / discharge schedule with a charge by time zone.

Cost calculation is performed on the additional charge / discharge schedule created in step SP65 from the power generation unit price transmitted from the power generation plan function 31 of the mid-supply system 30 (SP66). As a result of cost calculation,
Σ (additional charge / discharge schedule × medium power generation unit price) −Σ (additional charge / discharge schedule × secondary battery power generation unit price)
However, it is determined whether or not the secondary battery 20 is additionally charged / discharged in response to a request from the mid-supply system 30 depending on whether or not a certain threshold value set for determination for schedule replacement is exceeded (SP67). That is, when the threshold is not exceeded (SP67: No), the process is terminated without responding to the request from the mid-supply system 30. On the other hand, when the threshold value is exceeded (SP67: Yes), the charging / discharging schedule of the secondary battery 20 is changed, and at the same time, the additional charging / discharging schedule is transmitted to the power generation planning function 31 of the mid-supply system 30 (SP68). By periodically operating these operations (SP70), a generator operation plan is created.

  As described above, according to the power generation planning method according to the present embodiment, the consumer can effectively utilize the surplus of the secondary battery 20 and can clearly obtain a profit. At the same time, it becomes possible for the operator of the power system 10 to implement a power generation plan that suppresses the fuel cost of the generator.

  As described above, according to each embodiment, the original purpose of introducing the secondary battery 20 by the customer is realized, and at the same time, an economical operation plan of the thermal power generator 16 is made by utilizing the remaining capacity of the secondary battery 20. It becomes like this. For this reason, it becomes possible to suppress a fuel cost conventionally and can bring about a great effect on management of an electric power company.

  Note that the present invention is not limited to the configurations described in the above embodiments. Within the scope of the invented technical idea of the scope of claims, a person skilled in the art can conceive of various changes and modifications. The technical scope of the present invention is also applicable to these changes and modifications. It is understood that it belongs to.

The block diagram which shows the structural example of the electric power grid | system to which the power generation planning method which concerns on 1st Embodiment is applied. The detailed block diagram for demonstrating the control method of the secondary battery in an electric power grid | system. The processing flowchart which shows the control method to the secondary battery aiming at the fuel cost control of the generator by the power generation planning method which concerns on 1st Embodiment. The flowchart which shows the detailed process of secondary battery allocation calculation. The process flowchart which shows the control method to the secondary battery aiming at the fuel cost control of the generator by the power generation planning method which concerns on 2nd Embodiment. The process flowchart which shows the control method to the secondary battery aiming at the fuel cost control of the generator by the power generation planning method which concerns on 3rd Embodiment. The process flowchart which shows the control method to the secondary battery aiming at the fuel cost control of the generator by the power generation planning method which concerns on 4th Embodiment. The detailed block diagram for demonstrating the control method of the secondary battery in the electric power grid which applies the power generation planning method which concerns on 7th Embodiment. The processing flowchart which shows operation | movement of the electric power generation plan function of a secondary battery control system. The figure which shows the example of the daily demand curve in a consumer. The figure which shows an example of the demand curve of the day when the maximum electric power exceeded contract electric power. The block diagram which shows the control system of the secondary battery by a prior art. The figure which shows the output example of a secondary battery. The figure which shows an example of the state which suppressed the output fluctuation by the secondary battery. The figure which shows the output example of a secondary battery. The figure for demonstrating the contract electric power change by introduction of a secondary battery. The figure which shows the output characteristic of a secondary battery. The figure for demonstrating the potential of a secondary battery. The block diagram which shows the structural example of a general electric power grid | system.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Secondary battery, 2 ... Control apparatus, 3 ... Power receiving end, 5 ... Distribution system, 10 ... Electric power system, 11-15 ... Substation for distribution, 16 ... Thermal power generator, 17 ... Hydroelectric power generator, 18 ... Nuclear power Power generator, 21-24 ... secondary battery, 25 ... switch, 26 ... section switch, 27 ... distribution line, 30 ... middle supply system, 31 ... power generation planning function, 40 ... secondary battery control system, 41 ... shut-off , 42 ... detector, 43 ... DC / AC converter, 51 ... power generation planning function, 60 ... power transmission line, 61-64 ... customer

Claims (8)

Supplying power to the power system, including control of a secondary battery that is connected to a power system that supplies power to the consumer and that charges and discharges for the consumer. A method for creating a power generation plan for
Estimating the total power demand by all consumers who receive power from the power system;
Calculating fixed power generated by a fixed power generator that generates fixed power to be fed to the power system;
Calculating the fluctuating power that can be generated within the constraints satisfying the predetermined economic conditions by the fluctuating power generator that generates fluctuating power to be fed to the power system;
Calculating the total shared power shared by the secondary battery by subtracting the sum of the fixed power and the variable power from the total demand power;
Based on the current charge amount and operation schedule of each secondary battery, calculating the individual shared power shared by each secondary battery among the total shared power,
Based on the individual shared power, determining a new operation schedule or charge / discharge amount of each secondary battery;
A power generation planning method comprising: controlling each of the secondary batteries based on the determined new operation schedule or charge / discharge amount. The power generation planning method according to claim 1,
The variable power generator is composed of a combination of a thermal power generator, the secondary battery that is charged and pumped with surplus power generated by the thermal power generator, and a pumped-water generator, and relaxes restrictions on the amount of power generated by the pumped-power generator A power generation planning method in which the power generation amount of the thermal power generator is determined in consideration of the rated output or the increased capacity output of the secondary battery. The power generation planning method according to claim 1,
When the supply of electric power is insufficient with respect to demand and the above-mentioned variable economic power generator must generate power even if the predetermined economic conditions are not satisfied, the secondary battery is used. A power generation planning method in which at least a part of the insufficient power is applied by generating power. The power generation planning method according to claim 1,
In the case where power is generated by the modified power generator and the fixed power generator, the power that must be generated under the power generation conditions that have to sacrifice the predetermined economic conditions is generated by the power generation by the secondary battery. Power generation planning method to be applied. The power generation planning method according to claim 1,
Of the fixed power generator and the variable power generator, for a generator having a larger amount of carbon dioxide discharged during power generation than a predetermined value, the secondary battery is used instead of the generator to generate power, or In the time zone in which the amount of carbon dioxide discharged during power generation is greater than a predetermined value, the secondary power instead of any one of the fixed power generator and the variable power generator that discharges carbon dioxide during power generation. A power generation planning method that uses a battery to generate power. The power generation planning method according to claim 1,
The variable power generator is a set of a thermal power generator, the secondary battery that charges and pumps water with surplus power from the thermal power generator, and a pumped-water generator, and relaxes restrictions on pumping power by the pumped-power generator Thus, a power generation planning method that secures a margin for lowering the thermal power generator during off-peak hours of the power demand in consideration of the rated output or the increased capacity output of the secondary battery. The power generation planning method according to claim 1, wherein the variable power generator is a set of a thermal power generator, the secondary battery that performs charging and pumping with surplus power generated by the thermal power generator, and a pumped water generator.
A first power generation schedule for relaxing the amount of power generated by the pumped-storage generator;
Of the fixed power generator and the variable power generator, a generator that must generate power even if it does not satisfy the predetermined economic conditions, or must generate power even if it does not satisfy the predetermined economic conditions. A second power generation schedule with no time zone,
A power generation plan for creating a new operation schedule for each of the secondary batteries that shares at least one of the third power generation schedule based on power generation conditions that must sacrifice the predetermined economic conditions. Method. Supplying power to the power system, including control of a secondary battery that is connected to a power system that supplies power to the consumer and that charges and discharges for the consumer. A device for creating a power generation plan for
Estimating means for estimating total demand power by all consumers who receive power supply from the power system;
Fixed power calculation means for calculating fixed power generated by a fixed power generator for generating fixed power to be supplied to the power system;
Fluctuating power calculation means for calculating a fluctuating power that can be generated within a constraint condition that satisfies a predetermined economic condition by a fluctuating power generator that generates fluctuating power to be fed to the power system
A total shared power calculation means for calculating the total shared power shared by the secondary battery by subtracting the sum of the fixed power and the variable power from the total demand power;
Based on the current charge amount and operation schedule of each secondary battery, individual shared power calculation means for calculating individual shared power shared by each secondary battery among the total shared power,
Charge / discharge amount determination means for determining a new operation schedule or charge / discharge amount of each secondary battery based on the individual shared power;
A power generation planning apparatus comprising: a secondary battery control unit that controls each of the secondary batteries based on the determined new operation schedule or charge / discharge amount.

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