JP2018068076A - Storage battery control system and power supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a storage battery control system and a power supply system, effectively utilizing a storage battery provided in the power supply system.SOLUTION: A storage battery 13 charges power supplied from a commercial power system A and a fuel power generator 11, and discharges and supplies the charged power to a load L. A control unit 13 performs at least one of preliminary discharge control to calculate an estimated charge amount of the storage battery 13 during a first target period, to discharge the storage battery 13 in a period before the first target period, in such a manner that the power storage amount of the storage battery 13 in the first target period comes to have a magnitude enabling charging the estimated charge amount, and preliminary discharge control to calculate an estimated discharge amount of the storage battery 13 during a second target period, to charge the storage battery in a period before the second target period, in such a manner that the power storage amount of the storage battery 13 in the second target period comes to have a magnitude enabling discharging the estimated discharge amount.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply system including a fuel generator linked to a commercial power system, and a storage battery control system that controls a storage battery included in the power supply system.

  In recent years, attention has been focused on a power supply system including a gas engine generator linked to a commercial power system. This power supply system has an advantage of high energy efficiency because not only the power supplied by the power generation of the gas engine generator but also the exhaust heat generated during power generation can be used. In addition, this power supply system supplies power by allowing the gas engine generator to operate independently during a power outage during which power supply from the commercial power system stops (hereinafter referred to as “power outage”). There is also an advantage of being able to.

  However, when the gas engine generator operates independently during a power failure, the power consumption of the load fluctuates rapidly, and the amount of fluctuation is so large that it is difficult to follow the combustion control of the gas engine generator. The excess and deficiency between the amount and the amount of power supplied by the gas engine generator causes the frequency of the power supplied by the gas engine generator to vary significantly. In this case, the rotational speed of the gas engine generator fluctuates significantly, and in the worst case, there is a problem that the gas engine generator fails or stops. This problem is particularly noticeable when the gas engine generator performs lean combustion in order to improve power generation efficiency.

  Therefore, in Patent Document 1 and Non-Patent Document 1, when the gas engine generator operates independently during a power failure, the fluctuation of the frequency of the power supplied by the gas engine generator is suppressed by using the charging and discharging of the storage battery. A power supply system has been proposed. In these power supply systems, when the gas engine generator operates independently during a power outage, the output of the gas engine generator increases by discharging the storage battery if the load is applied or the power consumption of the load increases rapidly. The frequency stability of the gas engine generator can be improved by keeping the output reduction rate of the gas engine generator constant by charging the storage battery if the power consumption of the load decreases rapidly. Improve.

JP 2008-301545 A

Toshiyuki Ito, “Study on effective combination and control method of power storage that contributes to improvement of gas engine operation stability”, Doctoral dissertation, Graduate School of Environment and Energy, Waseda University, February 2012

  In the power supply systems proposed in Patent Document 1 and Non-Patent Document 1, charging and discharging of the storage battery are controlled based only on fluctuations in the power supplied by the gas engine generator, so that the storage battery is fully charged or completely discharged. It is possible to become the state of. When the storage battery is fully charged or completely discharged, subsequent charging or discharging becomes impossible, and it is impossible to suppress fluctuations in the frequency of power supplied by the gas engine generator. There's a problem.

  Further, in the power supply systems proposed in Patent Document 1 and Non-Patent Document 1, the storage battery simply waits in a floating charge state during normal times when power is supplied from the commercial power system. This is because, in normal times, fluctuations in the power consumption of the load are absorbed by the increase or decrease of the power supplied from the commercial power system, so the magnitude and frequency of the power supplied to the load by the gas engine generator are made constant (for example, This is because it is possible to perform a rated operation that maximizes the power generation efficiency), and charging and discharging of the storage battery become unnecessary. However, if the amount of power consumed by the load at normal times decreases significantly, the amount of power generated by the gas engine generator must also be reduced or the power generation must be stopped. There's a problem. In addition, when the power consumption of the load significantly increases during normal times, the amount of power supplied from the commercial power system must be increased accordingly. There is a problem that.

  Furthermore, in a power supply system using a fuel generator (a power generation device that generates power by consuming fuel) other than a gas engine generator such as a fuel cell, the same as the power supply system using the gas engine generator described above. Problems can arise.

  Then, this invention provides the storage battery control system and power supply system which utilize effectively the storage battery with which the power supply system is equipped.

  To achieve the above object, the present invention provides a storage battery control system including a control unit that controls charging and discharging of a storage battery, wherein the storage battery consumes a commercial power system and a predetermined fuel to generate power. Charging the power supplied from the machine, and discharging and supplying the charged power to a predetermined load that consumes the power supplied from the commercial power system and the fuel generator, and the control unit Calculates a predicted charge amount that is an amount of power that is predicted to be charged by the storage battery in a predetermined first target period in the future, and a storage amount of the storage battery in the first target period is charged to the predicted charge amount. Pre-discharge control for discharging the storage battery in a period before the first target period so as to have a possible size, and prediction that the storage battery will be discharged in a predetermined second target period in the future A period before the second target period so that the amount of electricity stored in the storage battery in the second target period is such that the predicted discharge amount can be discharged. The storage battery control system is characterized in that at least one of precharge control for charging the storage battery is performed.

  According to the storage battery control system, it is possible to prevent the storage battery from being in a state where it cannot be charged (for example, a fully charged state) by the pre-discharge control of the storage battery by the control unit, and / or the control unit. It becomes possible to prevent the storage battery from being in a state in which it cannot be discharged (for example, a state of complete discharge) by the precharge control of the storage battery.

  In the above storage battery control system, the control unit calculates the predicted charge amount and the preliminary discharge control when the first target period is a normal time when power is supplied from the commercial power system. At least one of the calculation of the predicted discharge amount and the pre-charge control when the second target period is the normal time may be performed.

  According to this storage battery control system, the storage battery can be charged and / or discharged in a normal state that occupies most of the period during which the power supply system operates. Then, by making the storage battery chargeable in normal times, for example, when the amount of power consumed by the load is small and the amount of power generated by the fuel generator is excessive, the reduction in the amount of power generated by the fuel generator or power generation It is possible to avoid the deterioration of the power generation efficiency of the fuel generator due to the stop of the operation. In addition, by making the storage battery dischargeable in normal times, for example, when the amount of power consumed by the load is large and the amount of power generated by the fuel generator is insufficient, the amount of power supplied from the commercial power system is excessively large. Thus, it becomes possible to prevent a tight supply and demand of commercial power grids and an increase in power charges. Also, by making the storage battery dischargeable at normal times, for example, when the fuel generator is stopped but the amount of power supplied from the commercial power system needs to be reduced slightly, the fuel generator is started. Thus, it is possible to avoid operating the fuel generator with poor power generation efficiency by generating a small amount of power.

  In the storage battery control system, the control unit performs at least the calculation of the predicted charge amount and the preliminary discharge control, and the control unit generates power during the first target period. Then, a first predicted power generation amount that is a predicted power amount and a first predicted load consumption amount that is a power amount predicted to be consumed by the load during the first target period are calculated, and the first When the predicted power generation amount is larger than the first predicted load consumption amount, the power amount obtained by subtracting the first predicted load consumption amount from the first predicted power generation amount is calculated as the predicted charge amount, and the first predicted power generation amount May be calculated with the predicted charge amount set to 0 when the predicted load consumption is less than or equal to the first predicted load consumption amount.

  According to this storage battery control system, the predicted charge amount can be accurately calculated based on the first predicted power generation amount and the first predicted load consumption amount during normal times when power can be supplied from the commercial power system.

  In the storage battery control system, the control unit performs at least the calculation of the predicted discharge amount and the precharge control, and the control unit generates power during the second target period. Then, a second predicted power generation amount that is a predicted power amount and a second predicted load consumption amount that is a power amount predicted to be consumed by the load during the second target period are calculated, and the second When the predicted load consumption is larger than the second predicted power generation amount, the predicted discharge amount that does not exceed the predicted difference amount that is the power amount obtained by subtracting the second predicted power generation amount from the second predicted load consumption amount is calculated. When the second predicted load consumption is equal to or less than the second predicted power generation amount, the predicted discharge amount may be calculated as zero.

  According to this storage battery control system, the predicted discharge amount can be accurately calculated based on the second predicted power generation amount and the second predicted load consumption amount in normal times when power can be supplied from the commercial power system.

  In the storage battery control system, when the predicted difference amount is larger than a predetermined discharge start threshold value, the control unit calculates an electric energy obtained by subtracting the discharge start threshold value from the predicted difference amount as the predicted discharge amount. And when the said prediction difference amount is below the said discharge start threshold value, you may calculate the said prediction discharge amount as 0.

  According to this storage battery control system, peak shift can be performed using the power discharged by the storage battery in normal times.

  Further, in the above storage battery control system, the control unit is configured to execute the commercial power supply in the second target period in response to a request to alleviate a tight power supply and demand of the commercial power system issued for the second target period. When part or all of the amount of power supplied from the power system to the load is reduced, the amount of power to be reduced may be calculated as the predicted discharge amount.

  According to this storage battery control system, it is possible to perform demand response using power discharged from the storage battery in normal times.

  In the above storage battery control system, the control unit performs at least the calculation of the predicted charge amount and the pre-discharge control, and the control unit stores the power of the storage battery that is reduced by the pre-discharge control. The amount of power supplied by the storage battery to the load instead of the fuel generator and the storage battery in order to start the fuel generator in the start stage of a power failure when the supply of power from the commercial power system stops The pre-discharge control may be performed such that at least one of the amount of electric power supplied to the fuel generator is equal to or greater than a necessary amount for the power failure start stage.

  In the storage battery control system, the control unit performs at least the calculation of the predicted discharge amount and the precharge control, and the control unit determines whether the storage amount of the storage battery in the second target period is The storage battery supplies the fuel in order to start the fuel generator and the amount of power that the storage battery supplies to the load in place of the fuel generator at the start of a power failure when the supply of power from the commercial power system stops. The pre-charge control may be performed so that the amount of power to be supplied to the generator is greater than or equal to the required amount of power failure start stage including the power amount.

  According to these storage battery control systems, the pre-discharge control and / or the pre-charge control of the storage battery is performed so that the storage amount of the storage battery is equal to or greater than the necessary amount at the power failure start stage. For this reason, it is possible to supply power to the load and start the fuel generator regardless of the timing of the power failure.

  Further, in the above storage battery control system, the control unit may charge the storage battery at a predetermined timing so that a storage amount of the storage battery that is reduced by natural discharge is equal to or greater than a necessary amount at the power failure start stage.

  According to this storage battery control system, even when the storage battery is on standby without being charged or discharged, it is possible to maintain the storage amount of the storage battery at or above the required amount for the power failure start stage.

  In the above storage battery control system, the control unit may calculate the necessary amount of power outage start stage according to the operating state of the fuel generator.

  In particular, in the above-described storage battery control system, the control unit requires that the power outage start stage required amount during the period when the fuel generator is generating power or immediately after the stop is smaller than the power outage start stage required amount during other periods. As described above, the required amount of power failure start stage may be calculated.

  According to these storage battery control systems, the power failure start stage required amount can be calculated strictly, and therefore it is possible to prevent the power failure start stage required amount from being estimated more than necessary. Therefore, it is possible to increase the amount of electricity stored in the storage battery that can be discharged in normal times.

  Further, in the above storage battery control system, the control unit may supply electric power supplied by the fuel generator when the operating state of the fuel generator during the power failure satisfies a predetermined standard and is stable. You may control the said storage battery so that it may charge.

  According to this storage battery control system, the storage battery can recover the amount of power lost due to discharge at the start of a power failure, so that the reduction in the frequency of power supplied by the fuel generator at the time of a power failure can be suppressed. It becomes possible to secure the necessary amount of the power outage start stage to be supplied when the discharge or the next power outage occurs.

  The present invention also includes a fuel generator that consumes a predetermined fuel and generates power, and that supplies power to a predetermined load linked to the commercial power system, and is supplied from the commercial power system and the fuel generator. A storage battery that charges and consumes the electric power to be supplied and supplies the electric power by discharging to the load, and the storage battery control system that includes a control unit that controls charging and discharging of the storage battery. A featured power supply system is provided.

  According to this power supply system, it is possible to prevent the storage battery from becoming unchargeable (for example, full charge) by the pre-discharge control of the storage battery by the control unit, and / or the storage battery by the control unit. This precharge control can prevent the storage battery from being in a state where it cannot be discharged (for example, complete discharge).

  According to the storage battery control system and the power supply system of the above characteristics, the control unit prevents the storage amount of the storage battery from becoming a non-chargeable size by performing pre-discharge control of the storage battery, and / or the control unit. Prevents the storage amount of the storage battery from becoming undischargeable by performing the precharge control of the storage battery. Therefore, the storage battery can be effectively used.

The block diagram shown about an example of the structure of the electric power supply system which concerns on embodiment of this invention. The time-sequential graph for demonstrating an example of operation | movement (pre-discharge control) of the electric power supply system in normal times. The time-sequential graph for demonstrating an example of operation | movement (pre-discharge control) of the electric power supply system in normal times. The time-sequential graph for demonstrating an example of operation | movement (precharge control) of the electric power supply system in normal time. The time-sequential graph for demonstrating an example of operation | movement (precharge control) of the electric power supply system in normal time. The time series graph for demonstrating an example of operation | movement of the electric power supply system at the time of a power failure. The time-sequential graph for demonstrating an example of the operation | movement of the electric power supply system in normal time (pre-discharge control which considered the amount required for the power failure start stage). The time-sequential graph for demonstrating an example of the operation | movement of the electric power supply system in normal time (pre-discharge control which considered the amount required for the power failure start stage). The time-sequential graph for demonstrating an example of the operation | movement of the electric power supply system in normal time (pre-charge control which considered the power failure start stage required amount). The time-sequential graph for demonstrating an example of the operation | movement of the electric power supply system in normal time (pre-charge control which considered the power failure start stage required amount). The time-sequential graph which shows an example of the calculation method of a power failure start stage required amount.

<< Configuration example of power supply system >>
First, an example of the configuration of a power supply system according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram illustrating an example of a configuration of a power supply system according to an embodiment of the present invention.

  As shown in FIG. 1, the power supply system 1 includes a fuel generator 11, an inverter 12, a storage battery 13, a consumption history data acquisition unit 14, a database 15, and a control unit 16. The load L shown in FIG. 1 may be a specific device that consumes power, or a collection of these devices (for example, all power consumption sources in facilities such as business establishments and houses). Also good.

  The fuel generator 11 is constituted by a power generation device that generates power by consuming a predetermined fuel, such as a gas engine generator or a fuel cell. The power generator constituting the fuel generator 11 supplies power in conjunction with the commercial power system A, for example, including a converter that can output AC power in synchronization with the AC power supplied from the commercial power system A. This is a possible configuration. In addition, the fuel generator 11 can supply power in conjunction with the commercial power system A during normal times when power is supplied from the commercial power system A, and the supply of power from the commercial power system A stops. In the event of a power failure, power can be supplied independently (independently) from the commercial power system A.

  The inverter 12 converts, for example, AC power supplied from the commercial power system A and the fuel generator 11 into DC power that can be charged by the storage battery 13 and AC power that allows the load L to consume the DC power discharged by the storage battery 13. It consists of a converter that converts to

  The storage battery 13 is configured by connecting at least one battery cell (single cell) that charges and discharges DC power, such as a lithium ion battery. In addition, the storage battery 13 measures various characteristics of the storage battery 13 (for example, individual battery cells or the entire voltage value, current value, internal resistance value, temperature, charged amount or state of charge (SOC)). In addition, a BMS (Battery Management System) 131 that charges and discharges the storage battery 13 according to the measurement result and the control instruction of the control unit 16 is provided.

  The consumption history data acquisition unit 14, for example, a measuring device that generates consumption history data that is time-series data obtained by measuring the amount of power consumed by the load L every unit time (for example, every 30 minutes) (for example, , Smart meter) or a data server that records consumption history data obtained by the measuring device (for example, a general electric power company that collectively records consumption history data obtained from smart meters installed in each facility) Is a communication device that acquires consumption history data wirelessly or by wire from a data server managed and operated by The consumption history data acquisition unit 14 may acquire the consumption history data from the measurement device or data server each time the measurement device or data server acquires new consumption history data, or for a certain period ( For example, consumption history data for one day or one week) may be acquired together.

  The database 15 is composed of a recording device capable of recording a large amount of data, such as a hard disk, and records consumption history data acquired by the consumption history data acquisition unit 14. In addition to the consumption history data, the database 15 also records power generation plan data that is data representing the operation schedule of the fuel generator 11 in normal times. The power generation plan data is data representing the start date / time and stop date / time of the fuel generator 11, the output of the fuel generator 11 (for example, the amount of power supplied by the fuel generator 11 per unit time), and the like.

  The control unit 16 includes, for example, an arithmetic device such as a CPU (Central Processing Unit) and a storage device such as a semiconductor memory. The control unit 16 acquires measurement results of the BMS 131 and various data recorded in the database 15 and controls charging and discharging of the storage battery 13 based on the acquired data. Specifically, the control unit 16 formulates a plan for charging and discharging the storage battery 13 based on the acquired data, and gives a control instruction to the BMS 131 so that the plan is executed.

<< Operation example of power supply system >>
Next, an operation example of the power supply system 1 according to the embodiment of the present invention will be described. Below, the operation example in the normal time of the power supply system 1 and the operation example at the time of a power failure will be described separately.

<Example of normal operation>
Next, an operation example of the power supply system 1 according to the embodiment of the present invention in a normal state will be described with reference to the drawings. 2 to 5 are time-series graphs for explaining an example of the operation of the power supply system in normal times. However, FIG.2 and FIG.3 is a graph for demonstrating the preliminary discharge control of the storage battery 13 by the control part 16, and FIG.4 and FIG.5 is a graph for demonstrating the precharge control of the storage battery 13 by the control part 16. FIG. is there.

  First, with reference to FIG.2 and FIG.3, the prior discharge control of the storage battery 13 by the control part 16 is demonstrated. FIG. 2A shows the “predicted power generation amount” (“first predicted power generation amount”) that is the power amount predicted to be generated by the fuel generator 11 in the future unit time (corresponding to the “first target period”). It is a graph which shows an example. FIG. 2B is a graph showing an example of “predicted load consumption” (corresponding to “first predicted load consumption”), which is the amount of power predicted to be consumed by the load L in a future unit time. FIG. 2C is a graph showing the “predicted difference amount” that is the amount of power calculated by subtracting the predicted power generation amount shown in FIG. 2A from the predicted load consumption amount shown in FIG. 2B. .

  The control unit 16 calculates the predicted power generation amount based on the power generation plan data recorded in the database 15. The predicted power generation amount shown in FIG. 2A is the power amount predicted to be obtained when the fuel generator 11 generates power (when rated operation is performed) so that the power generation efficiency is maximized.

  Further, the control unit 16 calculates the predicted load consumption based on the consumption history data recorded in the database 15. For example, the control unit 16 collectively calculates the predicted load consumption of a plurality of unit times on the prediction target day which is a future day. Specifically, for example, the control unit 16 selects one or more past days in the consumption history data whose conditions are similar to those of the prediction target day (for example, the day of the prediction target day and the day of the week or the month are the same, the latest of the prediction target date) Data of time series consumed by the load L during several days, etc., and statistical processing is performed on the extracted power amount data for each unit time (for example, the closer the condition is to the prediction target day, the greater the weight) Predictive load consumption is calculated by weighted average processing or simple average processing.

  Further, the control unit 16 calculates a predicted difference amount by subtracting the predicted power generation amount from the predicted load consumption amount, and calculates a predicted discharge amount and a predicted charge amount based on the predicted difference amount. The predicted discharge amount is the amount of power that is predicted to be discharged from the storage battery 13 in a future unit time. The predicted charge amount is an amount of power that is predicted to be charged by the storage battery 13 in a future unit time.

  When the predicted difference amount is positive, the control unit 16 calculates the amount of power that does not exceed the predicted difference amount as the predicted discharge amount. When the predicted difference amount is 0 or less, the control unit 16 calculates the predicted discharge amount as 0. More specifically, when the predicted difference amount is positive and larger than the discharge start threshold value Dth, the control unit 16 calculates, as the predicted discharge amount, the power amount obtained by subtracting the discharge start threshold value Dth from the predicted difference amount. When the amount is equal to or less than the discharge start threshold Dth, the predicted discharge amount is calculated as 0. In addition, the discharge start threshold value Dth is a value of an arbitrary size set by, for example, a user of the power supply system 1.

  The reason why the control unit 16 calculates the predicted discharge amount as described above will be described. When the predicted difference amount is positive, the predicted power generation amount is insufficient with respect to the predicted load consumption amount, and the shortage power amount is in principle covered by power supplied from the commercial power system A (purchased). However, if the amount of power supplied from the commercial power grid A per unit time becomes too large, it may be a factor that imposes a tight supply and demand of the commercial power grid A, and the power rate will rise. Therefore, when the predicted difference amount becomes larger than the discharge start threshold Dth, the control unit 16 discharges the storage battery 13 and reduces the amount of power supplied from the commercial power system A. That is, the control unit 16 performs the peak shift so that the power consumption amount per unit time does not become larger than the discharge start threshold value Dth. In the example shown in FIG. 2 (c), the predicted difference amount in any unit time does not become larger than the discharge start threshold Dth, so the storage battery 13 is not discharged for this purpose. That is, in the example shown in FIG. 2C, the predicted discharge amount in all unit times is calculated as zero.

  The control unit 16 calculates the absolute value of the predicted difference amount as the predicted charge amount when the predicted difference amount is negative, and calculates the predicted charge amount as 0 when the predicted difference amount is 0 or more.

  The reason why the control unit 16 calculates the predicted charge amount as described above will be described. When the predicted difference amount is negative, a part of the electric power generated by the fuel generator 11 is not consumed and remains. Therefore, the control unit 16 causes the storage battery 13 to charge the surplus power. Such a situation can frequently occur when the fuel generator 11 is operated with high efficiency regardless of the predicted load consumption as illustrated in FIG.

  In the example shown in FIGS. 2A to 2C, the predicted load consumption is small overall. Therefore, as illustrated in FIG. 2C, the storage battery 13 is not discharged in all unit times, and the storage battery 13 is charged in some unit times (unit time in which the predicted difference amount is smaller than 0). Is called. In other words, the control unit 16 calculates the predicted discharge amount in all unit times illustrated in FIGS. 2A to 2C as 0, and sets the predicted charge amount in some unit times to a value larger than 0. Calculate as

  FIG. 3A is a graph illustrating the amount of power stored in the storage battery 13 when charging of the storage battery 13 illustrated in FIG. 2C is performed, and the preliminary discharge control (details will be described later with reference to FIG. 3B). This will be described with reference to FIG. Moreover, in FIG. 3A and FIG. 3B described later, an upper limit value Cu and a lower limit value Cl of a range in which the storage amount of the storage battery 13 should be stored are also shown. The upper limit value Cu is the amount of electricity stored when the storage battery 13 is fully charged or the amount of electricity stored by subtracting a predetermined margin (error) from the amount of electricity stored. Similarly, the lower limit value Cl is the amount of electricity stored when the storage battery 13 is completely discharged or the amount of electricity stored by adding a predetermined margin (error) to the amount of electricity stored.

  As illustrated in FIG. 3A, when the storage battery 13 is charged without being discharged, the amount of power stored in the storage battery 13 becomes larger than the upper limit value Cu in the unit time T1. In this case, since the storage battery 13 cannot be charged after the unit time T1, there is a concern that the frequency of the power supplied by the fuel generator 11 will increase.

  Therefore, as illustrated in FIG. 3B, the control unit 16 has a storage time before the unit time T1 so that the storage amount of the storage battery 13 in the unit time T1 can be charged with the predicted charge amount. Pre-discharge control for discharging the storage battery 13 is performed in the period T2 (hatched area in the figure). By performing this preliminary discharge control, the amount of electricity stored in the storage battery 13 decreases, so that even if the estimated amount of charge is charged in the unit time T1, the amount of electricity stored in the storage battery 13 can be made to be the upper limit value Cu or less. Become. In order to effectively use the power discharged from the storage battery 13 by the pre-discharge control, it is preferable to perform the pre-discharge control during a period in which the predicted difference amount is positive (in particular, a period in which the predicted difference amount is as large as possible).

  Next, with reference to FIG.4 and FIG.5, the precharge control of the storage battery 13 by the control part 16 is demonstrated. FIG. 4A is a graph illustrating an example of a predicted power generation amount (corresponding to “second predicted power generation amount”) in a future unit time (corresponding to “second target period”). FIG. 4B is a graph illustrating an example of predicted load consumption (corresponding to “second predicted load consumption”) in a future unit time. FIG. 4C is a graph showing a predicted difference amount calculated by subtracting the predicted power generation amount shown in FIG. 4A from the predicted load consumption amount shown in FIG.

  The calculation method of the predicted power generation amount, the predicted load consumption amount, the predicted difference amount, the predicted charge amount, and the predicted discharge amount by the control unit 16 is the same as in the case of the pre-discharge control described with reference to FIGS. Moreover, the predicted load consumption illustrated in FIG. 4A is the same as the predicted load consumption illustrated in FIG.

  In the example shown in FIGS. 4A to 4C, the predicted load consumption is large as a whole. Therefore, as illustrated in FIG. 4C, the storage battery 13 is not charged in all unit times, and in some unit times (unit time in which the predicted difference amount is larger than the discharge start threshold Dth) Discharge occurs. In other words, the control unit 16 calculates the predicted discharge amount in all unit times illustrated in FIGS. 4A to 4C as 0, and sets the predicted charge amount in some unit times to a value larger than 0. Calculate as

  Furthermore, in the example shown in FIGS. 4A to 4C, a demand response request is issued in the period T3. The demand response is to reduce the amount of power supplied from the commercial power system A in order to alleviate the tight supply and demand of the commercial power system A. In this example, the demand response is supplied from the commercial power system A by discharging the storage battery 13. Reduce the amount of power consumed. The control unit 16 also calculates the amount of power that is discharged from the storage battery 13 by the demand response as the predicted discharge amount. In FIG. 4C, for convenience of explanation of the amount of power discharged from the storage battery 13 by demand response, the discharge start threshold value Dth is locally reduced in the period T3.

  For example, the control unit 16 acquires data related to execution of a demand response that is input by a user of the power supply system 1 by operating an input device such as a keyboard, or issues a demand response request via a predetermined communication device. Or the like, the demand response should be executed and the amount of power to be discharged by the storage battery 13 is recognized based on the demand response, and the predicted discharge amount including the amount of power is calculated. However, when the control unit 16 has a problem in controlling the storage battery 13 by executing the demand response (for example, the storage amount of the storage battery 13 in either a unit time scheduled to execute the demand response or a unit time thereafter) ) Is smaller than the lower limit value Cl), the demand response need not be executed.

  FIG. 5A is a graph illustrating the amount of electricity stored in the storage battery 13 when the storage battery 13 illustrated in FIG. 4C is discharged. The precharge control (details are shown later in FIG. 5B). This will be described with reference to FIG. In FIG. 5A and FIG. 5B described later, an upper limit value Cu and a lower limit value Cl are also shown.

  As illustrated in FIG. 5A, when the storage battery 13 is discharged without being charged, the amount of power stored in the storage battery 13 becomes smaller than the lower limit value Cl in unit time T4. In this case, since the storage battery 13 cannot be discharged after the unit time T4, the supply and demand of the commercial power system A due to the increase in the amount of power supplied from the commercial power system A to the load L, and the increase in power charges Is concerned.

  Therefore, as illustrated in FIG. 5B, the control unit 16 determines that the storage amount of the storage battery 13 in the unit time T4 is larger than the unit time T4 so that the predicted discharge amount can be discharged. Precharge control for charging the storage battery 13 is performed in the period T5 (hatched area in the figure). By performing this precharge control, the amount of electricity stored in the storage battery 13 increases, so that even if the predicted amount of discharge is discharged in the unit time T4, the amount of electricity stored in the storage battery 13 can be set to the lower limit value Cl or more. Become. In addition, in order to prevent the supply and demand of the commercial power system A and the increase in the electric power charge from occurring due to the precharge control, a period in which the predicted difference amount is as small as possible (especially even if the precharge control is performed, the predicted difference amount is discharged It is preferable to perform the pre-charge control during a period when the start threshold value Dth is below.

  As described above, in the power supply system 1 according to the embodiment of the present invention, the control unit 16 performs the pre-discharge control and the pre-charge control of the storage battery 13 so that the storage amount of the storage battery 13 cannot be charged and is not discharged. Prevent it from becoming possible. Therefore, the storage battery 13 can be used effectively.

  In particular, it is possible to make the storage battery 13 in a state in which charging and discharging can be performed in normal times that occupy most of the period in which the power supply system 1 operates. Then, by making the storage battery 13 chargeable in normal times, for example, when the amount of power consumed by the load L is small and the amount of power generated by the fuel generator 11 becomes excessive, the amount of power generated by the fuel generator 11 It is possible to avoid the deterioration of the power generation efficiency of the fuel generator 11 due to a decrease in power consumption or a stoppage of power generation. Further, by making the storage battery 13 dischargeable in normal times, for example, when the amount of power consumed by the load is large and the amount of power generated by the fuel generator is insufficient, the amount of power supplied from the commercial power system A is excessive. Therefore, it is possible to prevent the supply and demand of the commercial power system A from becoming tight and the electricity price from rising.

  4 and 5 show an operation example in the case where the power supply system 1 performs both demand response and peak shift, the power supply system 1 may perform only one of them. .

  Further, the control unit 16 may execute only one of the precharge control and the predischarge control. For example, the fuel generator 11 is small with respect to the load L, the load consumption is often larger than the power generation amount during rated operation of the fuel generator 11, and the storage amount of the storage battery 13 is lower than the lower limit value Cl. If there is a concern about only smallness (complete discharge), only precharge control may be performed. Further, for example, the fuel generator 11 is large with respect to the load L, the load consumption is often smaller than the power generation amount during the rated operation of the fuel generator 11, and the storage amount of the storage battery 13 is higher than the upper limit value Cu. If only the increase (full charge) is a concern, only pre-discharge control may be performed.

  2 to 5, even if the fuel generator 11 maintains the rated operation, the demand response and the peak shift are performed, the charged amount of the storage battery 13 is reduced by performing the precharge control and the predischarge control. Although an example of operation that is in the range of not less than the value Cl and not more than the upper limit value Cu (not fully charged and not completely discharged) is shown, the amount of power stored in the storage battery 13 even if precharge control and predischarge control are performed in some cases May deviate from the above range. In this case, the control unit 16 may relax at least one of the operating conditions in the power supply system 1 based on a predetermined index such as economy.

  Specifically, for example, as operating conditions of the power supply system 1, << 1 >> rated operation of the fuel generator 11, << 2 >> execution of demand response or peak shift, << 3 >> continuous operation of the fuel generator 11 (without stopping) Assume that the minimum power is generated). In this case, if the magnitude of economic loss (including lost profit) by ignoring the operating conditions is in the order of << 3 >>, << 2 >>, << 1 >>, the operating conditions are << 1 >>, << 2 >> and << 3 >> may be ignored in this order. However, it is assumed that the control unit 16 can control the operation of the fuel generator 11.

  2 to 5 exemplify the case where the fuel generator 11 is in operation, for example, the fuel generator 11 is stopped during a period when the power consumption of the load L is small, such as a business holiday. Can do. During this period, for example, if the fuel generator is stopped, but it is necessary to slightly reduce the amount of power supplied from the commercial power system, the storage battery 13 is in a state that can be discharged by the above-described pre-discharge control. May be discharged. As a result, it is possible to avoid operating the fuel generator with poor power generation efficiency by starting the fuel generator and generating a small amount of electric power.

<Operation example at power failure>
An operation example of the power supply system 1 according to the embodiment of the present invention during a power failure will be described with reference to the drawings. FIG. 6 is a time-series graph for explaining an example of the operation of the power supply system during a power failure. FIG. 6A is a graph showing an example of “load consumption”, which is the amount of power consumed by the load L per unit time. FIG. 6B is a graph illustrating an example of “power generation amount” that is the amount of power generated and supplied by the fuel generator 11 per unit time. FIG. 6C shows an example of “charge amount” that is the amount of power that the storage battery 13 charges per unit time and “discharge amount” that is the amount of power that the storage battery 13 discharges and supplies to the load L per unit time. It is a graph.

  As shown in FIGS. 6A and 6B, during a power outage, there is no supply of power from the commercial power system A, so the power generation amount can vary in accordance with the variation in load consumption. However, when the load consumption increases rapidly compared to the previous unit time as in the first unit time of the period T6, or compared to the previous unit time as in the first unit time of the period T7. If the power generation amount cannot follow the fluctuation of the load consumption in the case of sudden decrease, the frequency of the power supplied by the fuel generator 11 fluctuates. In the worst case, the fuel generator 11 breaks down or stops. There is a fear.

  Therefore, as shown in FIG. 6C, when the load consumption fluctuates greatly compared to the immediately preceding unit time, such as the first unit time in each of the periods T6 and T7, the control unit 16 determines this load. By compensating for the excess and deficient amount of power generated when the power generation amount cannot follow the fluctuation of the consumption amount by charging and discharging the storage battery 13, the variation in the frequency of the power supplied by the fuel generator 11 is suppressed. .

  Specifically, for example, the control unit 16 detects fluctuations in the load consumption amount by monitoring the amount of electric power and the amount of current that the fuel generator 11 supplies to the load L. And the control part 16 is compared with the load consumption in the last unit time, when it is estimated that the load consumption in the next unit time increases rapidly (for example, the fluctuation | variation of the load consumption in the time interval shorter than unit time) When the amount becomes larger than a predetermined threshold value), the insufficient amount of power is supplied by discharging the storage battery 13 (see period T6). In addition, the control unit 16 may predict that the load consumption in the immediately following unit time is suddenly reduced as compared with the load consumption in the immediately preceding unit time (for example, fluctuation in load consumption in a time interval shorter than the unit time). When the amount becomes larger than a predetermined threshold value), the excessive amount of power is absorbed by charging the storage battery 13 (see period T7). In these cases, the control unit 16 charges and discharges the storage battery 13 only for the amount of power and the period necessary to compensate for the excess and deficiency of the amount of power generated when the power generation amount cannot follow the load consumption. .

  The control unit 16 may perform the precharge control and the predischarge control described in the above <normal operation example> during a power failure. However, when the precharge control is performed at the time of a power failure, since the storage battery 13 charges a part of the power generated by the fuel generator 11, the power generation amount of the fuel generator 11 during the period in which the precharge control is executed increases. To do. Therefore, it is preferable that the control unit 16 performs the precharge control during a period in which the predicted load consumption is smaller than the amount of power obtained when the fuel generator 11 performs rated operation, for example. Moreover, when performing prior discharge control at the time of a power failure, since the electric power which the storage battery 13 discharges covers a part of electric power which the load L consumes, the electric power generation amount of the fuel generator 11 in the period which performs prior discharge control Decrease. Therefore, it is preferable that the control unit 16 performs pre-discharge control during a period in which the predicted load consumption is larger than the amount of power obtained when the fuel generator 11 is rated.

  In the above description, the case where the control unit 16 controls the charging and discharging of the storage battery 13 based on the load consumption is illustrated, but the control unit 16 acquires the frequency of the power generated by the fuel generator 11. At the same time, charging and discharging of the storage battery 13 may be controlled based on the frequency. For example, when the control unit 16 charges the storage battery 13 when the frequency of the fuel generator 11 becomes higher than a predetermined upper limit threshold, and the frequency of the fuel generator 11 becomes lower than the predetermined lower limit threshold. The storage battery 13 may be discharged. Similarly, the control unit 16 may acquire the rotation speed of the fuel generator 11 that is a gas engine generator, and may control charging and discharging of the storage battery 13 based on the rotation speed.

<< Deformation, etc. >>
[1] In the power supply system 1, the “power failure start stage necessary amount” that is the amount of power required at the power failure start stage may be supplied by discharging the storage battery 13. The amount of power required to start the power failure includes the amount of power supplied from the storage battery 13 to the load L instead of the fuel generator 11 and the amount of power supplied from the storage battery 13 to the fuel generator 11 to start the fuel generator 11. At least one is included. In addition, the storage battery 13 supplies the load L before the fuel generator 11 starts to supply power to the load L as the amount of power that the storage battery 13 supplies to the load L instead of the fuel generator 11. The storage battery 13 supplies the load L in order to stabilize the amount of power and the power supplied by the fuel generator 11 after the fuel generator 11 starts supplying power to the load L (for example, to suppress fluctuations in frequency). The amount of power to be included. Note that a predetermined margin (error) may be included in the power outage start stage necessary amount.

  In this case, it is preferable that the control unit 16 controls the charging and discharging of the storage battery 13 so that the storage amount of the storage battery 13 is equal to or greater than the necessary amount at the power failure start stage so that the power failure may occur at any timing. . An operation example of the power supply system 1 in this case will be described below with reference to the drawings.

  7 and 8 are time-series graphs for explaining an example of the operation of the power supply system in normal times (pre-discharge control in consideration of the necessary amount of power failure start stage). The graphs described in FIGS. 7A to 7C are the same as those in FIGS. 2A to 2C, and the graphs described in FIGS. Same as (a) and (b).

  As shown to Fig.8 (a), when the control part 16 does not perform prior discharge control, the electrical storage amount of the storage battery 13 in unit time T1 will become larger than the upper limit Cu. In addition, as shown in FIG. 8B, when the control unit 16 performs the pre-discharge control in the period T2 without considering the power failure start stage required amount Cx (hatched area in the drawing), the storage battery decreases by the pre-discharge control. The amount of electricity stored in 13 is smaller than the required amount Cx at the power outage start stage.

  Therefore, as illustrated in FIG. 8C, the control unit 16 performs the pre-discharge control so that the storage amount of the storage battery 13 that is decreased by the pre-discharge control is equal to or greater than the power failure start stage necessary amount Cx. Specifically, the control unit 16 performs the pre-discharge control in the period T8 in which the power storage amount is large, not in the period T2 in which the power storage amount is small (hatched area in the drawing).

  9 and 10 are time-series graphs for explaining an example of the operation of the power supply system in normal times (pre-charge control in consideration of the necessary amount of power failure start stage). 9A to 9C are the same as those shown in FIGS. 4A to 4C, and the graphs shown in FIGS. 10A and 10B are the same as those shown in FIG. Same as (a) and (b).

  As shown to Fig.10 (a), when the control part 16 does not perform precharge control, the electrical storage amount of the storage battery 13 will become smaller than the lower limit Cl in unit time T4. Further, as shown in FIG. 10B, when the control unit 16 only performs the precharge control in the period T5 without considering the power failure start stage necessary amount Cx (hatched area in the figure), in the unit time T4. The amount of electricity stored in the storage battery 13 becomes smaller than the required amount Cx at the start of power failure.

  Therefore, as illustrated in FIG. 10C, the control unit 16 performs precharge control so that the amount of power stored in the storage battery 13 in the unit time T4 is equal to or greater than the power outage start stage required amount Cx. Specifically, the control unit 16 performs pre-charge control in the period T9 in addition to the period T5 (hatched area in the figure).

  As described above, the control unit 16 performs the pre-discharge control and the pre-charge control so that the power storage amount of the storage battery 13 is equal to or greater than the power outage start stage necessary amount Cx, so that a power outage occurs at any timing during normal times. However, it is possible to supply power to the load L and start the fuel generator 11.

  In the above-described embodiment, the operating conditions of the power supply system 1 include three conditions: << 1 >> rated operation of the fuel generator 11, << 2 >> demand response or peak shift, and << 3 >> continuous operation of the fuel generator 11. Although the priorities are mentioned with reference to the example, << 4 >> the maintenance of the required amount Cx of the power failure start stage can be one of the operation conditions. In this case, the priority order may be set based on the economy as described above, but << 4 >>, which is an operating condition for preparing for an emergency such as a power failure, is more than the other operating conditions << 1 >> to << 3 >>. Also, it may be set so as not to be relaxed.

  Further, the amount of electricity stored in the storage battery 13 can be varied by natural discharge in addition to charging and discharging. Therefore, the control unit 16 may charge the storage battery 13 at a predetermined timing so that the storage amount of the storage battery 13 that decreases due to natural discharge becomes equal to or greater than the power failure start stage required amount Cx. For example, when the storage battery 13 is on standby without being charged or discharged, the control unit 16 recognizes the storage amount of the storage battery 13 based on the measurement result of the BMS 131, and the storage amount is equal to or greater than the power outage start stage necessary amount Cx. The storage battery 13 may be charged when it falls below a predetermined threshold (or is predicted to fall below the threshold). Further, for example, when the storage battery 13 is on standby without being charged or discharged, the control unit 16 may charge the storage battery 13 at a predetermined time interval.

[2] The power failure start stage required amount Cx described in [1] above can be strictly changed according to the operating state of the fuel generator 11. Therefore, the control unit 16 may calculate the power failure start stage necessary amount Cx so as to fluctuate according to the operating state of the fuel generator 11, and perform the above-described control based on the power failure start stage necessary amount Cx.

  Here, a strict power failure start stage required amount calculation method according to the operating state of the fuel generator 11 will be described with reference to the drawings. FIG. 11 is a time-series graph showing an example of a method for calculating the required amount of power outage start stage. FIG. 11A is a graph showing the predicted power generation amount of the fuel generator 11. FIG.11 (b) is a graph which shows the power failure start stage required amount in case the fuel generator 11 produces | generates the estimated electric power generation amount shown to Fig.11 (a).

  As shown in FIGS. 11A and 11B, the control unit 16 determines that the power outage start stage required amount in the period T10 during the power generation of the fuel generator 11 or immediately after the stop is the power outage start stage required amount in other periods. The required amount of power failure start stage is calculated so as to be smaller than that. This is because if the fuel generator 11 is generating electricity or just after it is stopped, the temperature of the device is already higher than in other cases (when it has been stopped for a certain period of time). This is because the electric power for starting the generator 11 is unnecessary or small, and the time until the fuel generator 11 can stably supply electric power can be shortened.

  The control unit 16 predicts the operating state of the fuel generator 11 based on the power generation plan data recorded in the database 15 and calculates the required amount of power outage start stage. At this time, the control unit 16 obtains actual measurement data (for example, data indicating the output of the fuel generator 11, equipment such as lubricating oil and cooling water) that represents the operating state of the fuel generator 11 acquired from the fuel generator 11. Based on the data indicating the cold temperature state, the power outage start stage necessary amount may be calculated. Since the control unit 16 can recognize the actual operating state of the fuel generator 11 at the present time by referring to the actual measurement data, the predicted accuracy of the operating state of the fuel generator 11 and the necessary amount of power failure start stage thereafter The calculation accuracy of can be improved. Further, since the actual measurement data is recorded in the database 15 and the past actual measurement data and the power generation plan data are associated with each other, the control unit 16 can recognize the correspondence between the past power generation plan and the actually measured operating state. In addition, it is possible to further improve the prediction accuracy of the operating state of the fuel generator 11 in the future and the calculation accuracy of the required amount of power failure start stage.

  Thus, if the control part 16 calculates a power failure start stage required amount exactly | strictly, it can prevent estimating the power failure start stage required amount larger than necessary. Therefore, the amount of electricity stored in the storage battery 13 that can be discharged in normal times can be increased.

[3] During a power failure, the fuel generator 11 is operating stably (for example, satisfying a predetermined standard, such as fluctuations in the frequency of power supplied by the fuel generator 11 being within a predetermined range) The control unit 16 may charge the storage battery 13.

  Thereby, since the storage battery 13 can recover the amount of power lost by discharging at the start stage of the power failure, the discharge for suppressing the decrease in the frequency of the power supplied by the fuel generator 11 at the time of the power failure (see FIG. 6) (see period T1 in FIG. 6), and it is possible to secure the necessary amount of power failure start stage to be supplied when the next power failure occurs.

[4] The power supply system 1 may include a renewable energy generator using renewable energy such as a solar power generator or a wind power generator. In this case, for example, the control unit 16 may predict not only the fuel generator 11 but also the future power generation amount of the renewable energy generator, and the sum thereof may be set as the predicted power generation amount. In this case, for example, the control unit 16 corresponds to the power generation amount of the renewable energy generator recorded in the database 15 and an index (for example, weather information such as weather, temperature, wind speed) having a strong correlation with the power generation amount. A future power generation amount of the renewable energy generator may be predicted based on the attached data and a prediction result (for example, weather forecast) of the index.

[5] In the power supply system 1, when the power supplied by the commercial power grid A, the power supplied by the renewable energy generator, the power consumed by the load L, etc. suddenly fluctuate, the voltage at the output stage of the fuel generator 11 May fluctuate greatly, which may adversely affect the fuel generator 11 or reduce the power factor of the power supplied to the load L. Therefore, the control unit 16 charges and discharges the storage battery 13 and adjusts the power at the output stage of the fuel generator 11 via the inverter 12, thereby protecting the fuel generator 11 (for example, the voltage before and after the fluctuation or The voltage change rate may fall within a predetermined range) or the power factor may be improved (close to 100%). Further, the control unit 16 may monitor the voltage at the output stage of the fuel generator 11 and perform the above control when a fluctuation is detected or predicted.

[6] The power supply system 1 does not include the consumption history data acquisition unit 14, and the database 15 may not record new consumption history data. In this case, the control unit 16 calculates the predicted load consumption based only on the consumption history data recorded in advance in the database 15. However, when the power supply system 1 includes the consumption history data acquisition unit 14 and the database 15 records new consumption history data, the consumption history data representing the amount of power consumed by the load L in the near past is recorded in the database 15. can do. For this reason, the control unit 16 can accurately calculate the predicted power consumption amount by using the consumption history data.

[7] In the block diagram of the power supply system 1 shown in FIG. 1, each of the database 15 and the control unit 16 (corresponding to “storage battery control system”) includes a storage battery 13 or the like (fuel generator 11, inverter 12, storage battery 13, Although it is shown in the facility having the consumption history data acquisition unit 14 and the load L) and corresponds to the storage battery 13 etc. on a one-to-one basis, it is installed in a place away from the storage battery 13 etc. Alternatively, it may be shared by a plurality of storage batteries 13 or the like. For example, the database 15 and the control unit 16 are configured by one server computer, and a communication device for communicating with the server computer is provided for each of the plurality of facilities, and the server computer ( The control unit 16) may control charging and discharging of the storage battery 13 in each of the facilities. Further, when the consumption history data acquisition unit 14 acquires the consumption history data of a plurality of loads L from a predetermined data server, the consumption history data acquisition unit 14 is also configured as a part of the server computer. May be.

[8] The demand response may include not only consuming the electric power discharged by the storage battery 13 at the load L but also supplying the electric power discharged by the storage battery 13 to the commercial power system A (reverse power flow). .

[9] In the above-described embodiment, the control unit 16 charges the storage battery 13 only by an excessive amount of electric power (for example, the difference amount in the case where the electric power generation amount of the fuel generator 11 is larger than the load consumption amount). Control is performed such that the storage battery 13 is discharged by an insufficient amount of electric power (for example, when the load consumption is larger than the amount of power generated by the fuel generator 11 and exceeds the discharge start threshold Dth in the difference amount). Although illustrated about the case where it performs, the control method of charge and discharge of the storage battery 13 by the control part 16 is not restricted to this example.

  For example, the control unit 16 may cause the storage battery 13 to charge an amount of power that is greater than or equal to the excess amount of power, or may cause the storage battery 13 to discharge an amount of power that is greater than or equal to the insufficient amount of power. In particular, when charging / discharging efficiency of the storage battery 13 and conversion efficiency of the inverter 12 are taken into consideration, it is better to charge or discharge a larger amount of power than to charge or discharge a small amount of power. There is a case. Therefore, for example, data indicating the correspondence between the required amount of charge or discharge (surplus or insufficient power amount) and the amount of charge or discharge with high efficiency of the entire system, or necessary for deriving the correspondence Data representing various characteristics may be recorded in the database 15, and the control unit 16 may control charging or discharging of the storage battery 13 based on these data.

  The present invention can be used for a power supply system including a fuel generator linked to a commercial power system and a storage battery control system for controlling a storage battery included in the power supply system.

1: Power supply system 11: Fuel generator 12: Inverter 13: Storage battery 131: BMS
14: Consumption history data acquisition unit 15: Database 16: Control unit A: Commercial power system L: Load T1 to T10: Unit time, period Dth: Discharge start threshold Cu: Upper limit value Cl: Lower limit value Cx: Necessary amount of power failure start stage

Claims (13)

A storage battery control system comprising a control unit for controlling charging and discharging of a storage battery,
The storage battery charges a power supplied from a commercial power system and a fuel generator that generates power by consuming a predetermined fuel, and a predetermined load that consumes power supplied from the commercial power system and the fuel generator To discharge and supply the charged power,
The controller is
A predicted charge amount that is an amount of power that is predicted to be charged by the storage battery in a predetermined first target period in the future is calculated, and a storage amount of the storage battery in the first target period can be charged with the predicted charge amount. Pre-discharge control for discharging the storage battery in a period before the first target period so as to be a size;
A predicted discharge amount that is an amount of power that is predicted to be discharged by the storage battery in a predetermined second target period in the future is calculated, and a storage amount of the storage battery in the second target period is capable of discharging the predicted discharge amount. Precharge control for charging the storage battery in a period prior to the second target period so as to be a size;
A storage battery control system that performs at least one of the following.   The control unit calculates the predicted charge amount and performs the preliminary discharge control when the first target period is a normal time when power is supplied from the commercial power system, and the second target period is the normal time. 2. The storage battery control system according to claim 1, wherein at least one of the calculation of the predicted discharge amount and the precharge control in the case of The control unit performs at least the calculation of the predicted charge amount and the preliminary discharge control,
The controller is
A first predicted power generation amount that is predicted to be generated by the fuel generator during the first target period, and a first predicted load consumption amount that is predicted to be consumed by the load during the first target period. Each of the quantity,
When the first predicted power generation amount is larger than the first predicted load consumption amount, the power amount obtained by subtracting the first predicted load consumption amount from the first predicted power generation amount is calculated as the predicted charge amount, and the first The storage battery control system according to claim 2, wherein when the predicted power generation amount is equal to or less than the first predicted load consumption amount, the predicted charge amount is calculated as zero. The control unit performs at least the calculation of the predicted discharge amount and the precharge control,
The controller is
A second predicted power generation amount that is predicted to be generated by the fuel generator during the second target period, and a second predicted load consumption amount that is predicted to be consumed by the load during the second target period. Each of the quantity,
When the second predicted load consumption is larger than the second predicted power generation, the predicted discharge amount does not exceed a predicted difference amount that is an amount of power obtained by subtracting the second predicted power generation from the second predicted load consumption. 4. The storage battery control system according to claim 2, wherein when the second predicted load consumption is equal to or less than the second predicted power generation amount, the predicted discharge amount is calculated as 0. 5.   When the predicted difference amount is larger than a predetermined discharge start threshold, the control unit calculates an amount of power obtained by subtracting the discharge start threshold from the predicted difference amount as the predicted discharge amount, and the predicted difference amount is calculated as the discharge amount. The storage battery control system according to claim 4, wherein the predicted discharge amount is calculated as 0 when it is equal to or less than a start threshold.   The control unit is supplied from the commercial power system to the load during the second target period in response to a request to alleviate the tight power supply and demand of the commercial power system issued for the second target period. 6. The storage battery control system according to claim 4, wherein when part or all of the electric energy is reduced, the electric energy to be reduced is calculated as the predicted discharge amount. The control unit performs at least the calculation of the predicted charge amount and the preliminary discharge control,
The control unit is configured such that the storage battery is replaced with the load instead of the fuel generator at a power outage start stage in which power supply from the commercial power system is stopped when the storage amount of the storage battery that is reduced by the preliminary discharge control is stopped. The pre-discharge control is performed so that the amount of power to be supplied and at least one of the amount of power to be supplied to the fuel generator by the storage battery in order to start the fuel generator is equal to or greater than a necessary amount of power failure start stage including The storage battery control system according to any one of claims 2 to 6. The control unit performs at least the calculation of the predicted discharge amount and the precharge control,
The control unit supplies the load from the storage battery to the load in place of the fuel generator at the start stage of a power failure in which the storage amount of the storage battery in the second target period stops the supply of power from the commercial power system. Performing the pre-charge control so that the amount of electric power and at least one of the amount of electric power supplied to the fuel generator by the storage battery in order to start the fuel generator is equal to or greater than a necessary amount of power failure start stage including The storage battery control system according to any one of claims 2 to 7,   9. The control unit according to claim 7, wherein the control unit charges the storage battery at a predetermined timing so that a storage amount of the storage battery that is reduced by natural discharge is greater than or equal to a necessary amount at the power failure start stage. Storage battery control system.   The storage battery control system according to any one of claims 7 to 9, wherein the control unit calculates the necessary amount of the power failure start stage according to an operating state of the fuel generator.   The control unit includes the power outage start stage necessary amount so that the power outage start stage required amount during the period when the fuel generator is generating power or immediately after the stop is smaller than the power outage start stage necessary amount during other periods. The storage battery control system according to claim 10, wherein:   The control unit controls the storage battery so as to charge the power supplied by the fuel generator when the operating state of the fuel generator during the power outage satisfies a predetermined standard and is stable. The storage battery control system according to any one of claims 7 to 11, wherein: A fuel generator that consumes a predetermined fuel and generates power, and supplies power to a predetermined load linked to a commercial power system;
A storage battery that charges and consumes power supplied from a commercial power system and the fuel generator, and supplies power by discharging to the load;
The storage battery control system according to any one of claims 1 to 12, further comprising a control unit that controls charging and discharging of the storage battery,
A power supply system comprising:

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