JP6662091B2 - Power storage system control device, system having the control device, and power storage system control method - Google Patents

Description

  The present invention relates to a technique for controlling a plurality of power storage systems for stabilizing power system fluctuations.

  In recent years, interconnection to power systems such as wind power generation and solar power generation has been promoted. On the other hand, the output of these naturally fluctuating power sources fluctuates, and the output is unstable. Therefore, there is a concern that power quality may deteriorate or supply and demand may become unstable.

  As a measure for maintaining the quality of power and stabilizing supply and demand, for example, suppression of output fluctuation of a naturally fluctuating power supply by a power storage system can be cited. Here, the power storage system is a system that connects a power storage device such as an EDLC (Electric Double-Layer Capacitor), a secondary battery, a flywheel, and compressed air to a power system via a power conversion device. Is what you do. In the output fluctuation suppression processing of the natural power supply by the power storage system, a charge / discharge command value that cancels the output fluctuation of the natural power supply is calculated, and charging or power to the power storage system is performed based on the charge / discharge command value. Discharge from the storage system. As a result, the output of the natural fluctuation power supply is smoothed.

  As another measure, for example, frequency fluctuation suppression by a power storage system can be cited. In the power system, the frequency is constantly maintained by balancing power generation and demand.However, if the supply and demand balance is disrupted due to fluctuations in the output of naturally fluctuating power sources, such fluctuations appear as frequency fluctuations, causing power system instability. And deterioration of power quality. In the frequency fluctuation suppression process by the power storage system, the frequency of the power system is detected, a charge / discharge command value for canceling the fluctuation is calculated, and the power storage system performs charging / discharging based on the charge / discharge command value. . This stabilizes the power system and maintains power quality.

  In the frequency fluctuation suppression, the frequency detection, the calculation of the charge / discharge command value, the charge / discharge of the power storage system are performed in each power storage system, and the frequency detection is performed in a central power supply command center (power supply system) or the like. In some cases, calculation and transmission (load frequency control) of a charge / discharge command value for the power storage system is performed, and the power storage system performs charging / discharging based on the charge / discharge command.

  In stabilizing the power system by such a power storage system, a plurality of power storage systems may constitute one power storage site, and each of the power storage systems may share and output charge and discharge power of a different periodic component. is there. Specifically, a plurality of power storage systems each having a power storage device having different charge / discharge characteristics are configured, and charge / discharge power of different cycles is shared according to the respective charge / discharge characteristics.

  Regarding this, for example, in Patent Document 1, in the output fluctuation suppression of the natural fluctuation power supply, after the power storage system a compensates for the short-period fluctuation component, the other power storage system b compensates for the long-period fluctuation component. Is disclosed.

JP-A-2002-349417

  According to the technique disclosed in Patent Document 1, the power storage system b charges the power discharged by the power storage system a, or discharges the power charged by the power storage system a from the power storage system b. And so on.

  FIG. 10 is a diagram for explaining a problem of the related art disclosed in Patent Document 1. Among these, FIG. 10A shows a short-period output fluctuation suppression by the power storage system a, and FIG. 10B shows a long-period output fluctuation suppression by the power storage system b.

  According to the output fluctuation suppressing method disclosed in Patent Literature 1, first, a short-period fluctuation is smoothed by the power storage system a, and then the power storage system is used for the power smoothed by the power storage system a. In step b, long-period fluctuations are smoothed. In such a method, a state occurs in which the power storage system b charges the power discharged by the power storage system a, and conversely, a state occurs in which the power storage system b discharges the power charged by the power storage system a. Such charging / discharging between the power storage systems does not only contribute to the suppression of the output fluctuation of the naturally fluctuating power supply, which is the original purpose, but also causes a loss due to charging / discharging.

  An object of the present invention is to provide a technique capable of reducing charge and discharge between power storage systems and thereby reducing loss due to charge and discharge between power storage systems.

According to the control device of one embodiment of the present invention, when the power storage system including the power storage device and the power conversion device is configured with N (N is an integer of 3 or more) units and stabilizes the power system, A control device for controlling charging / discharging of each of the power storage devices, the power storage site charging / discharging being a charge / discharge command value for the entire N power storage systems for stabilizing the power system. A charge / discharge command value calculation unit for calculating a command value and a first charge / discharge command value for a first power storage system that performs charge / discharge in the longest cycle are transmitted to control the first power storage system. A first control unit, and a k-th charge / discharge command value for a k-th power storage system that performs charging / discharging at a shorter cycle than the (k−1) -th (k is an integer of 2 or more and less than N) power storage system To the k-th A control unit of the k for controlling the storage system, and a control unit of the N which controls the power storage system of the first N, among the N control unit, said first control unit Calculating the upper and lower envelopes of the power storage site charge / discharge command value , based on the upper and lower envelopes, extracting the longest cycle component from the power storage site charge / discharge command value. A first determination unit that determines a first charge / discharge command value for the first power storage system based on the first waveform, and the k-th control unit includes: , The power storage site charge / discharge command value or the (k-1) th charge / discharge residual, which is the input value to the (k-1) th determination unit, and the (k-1) th determination unit determines A k-th calculation unit for calculating a k-th charge / discharge residual from the (k−1) th charge / discharge command value obtained, Based on the upper and lower envelope of charging and discharging residual of the first k seeking upper and lower envelope of charging and discharging residuals, the determining unit of the first (k-1) is determined A k-th waveform obtained by extracting a short-period component from the charge / discharge command value of (k-1) is obtained, and a k-th charge / discharge command value for the k-th power storage system is calculated based on the k-th waveform. And a k-th determining unit for determining, wherein the N-th control unit determines a charge / discharge residual which is an input value to the (N-1) -th determining unit and a (N-1) -th determination. An N-th calculation unit for calculating an N-th charge / discharge residual from the (N-1) th charge / discharge command value determined by the unit, and an N-th waveform from the N-th charge / discharge residual; An N-th determination unit that determines an N-th charge / discharge command value for the N-th power storage system based on the N-th waveform.

According to the control device according to another aspect of the present invention, when the power storage system including the power storage device and the power conversion device is configured with N (N is an integer of 3 or more) units and the power system is stabilized, A control device for controlling the charging and discharging of each of the power storage devices, wherein the power storage site is a command value for charging and discharging the entire N power storage systems for stabilizing the power system. A charge / discharge command value calculation unit for calculating a charge / discharge command value, and a first charge / discharge command value for a first power storage system that performs charge / discharge in the shortest cycle, and controlling the first power storage system And a k-th charge / discharge for a k-th power storage system that performs charging / discharging at a longer cycle than the (k-1) -th (k is an integer of 2 or more and less than N) power storage system The command value is transmitted and the k-th And a control unit of the k for controlling the energy storage system, and a control unit of the N which controls the power storage system of the first N, among the N control unit, the first control unit based on the envelope of said upper and lower seeking upper and lower envelopes of said electric power storage site discharge command value, to extract the component of the shortest period from the power storage site discharge command value A first determination unit that determines a first waveform, and determines a first charge / discharge command value for the first power storage system based on the first waveform, the k-th control unit The power storage site charge / discharge command value or the (k-1) th charge / discharge residual value, which is an input value to the (k-1) th determination unit, and the (k-1) th determination unit A k-th calculation unit that calculates a k-th charge / discharge residual from the determined (k−1) th charge / discharge command value; Based on the upper and lower envelope of charging and discharging residual of the first k seeking upper and lower envelope of charging and discharging the residual of the k, determining unit of the first (k-1) is determined A k-th waveform obtained by extracting a long-period component from the (k-1) th charge / discharge command value obtained is obtained, and a k-th charge / discharge command for the k-th power storage system is obtained based on the k-th waveform. A k-th determination unit for determining a value, wherein the N-th control unit is configured to control a charge / discharge residual value which is an input value to the (N-1) -th determination unit; An (N−1) th charging / discharging command value determined by the determining unit, and an Nth calculating unit that calculates an Nth charging / discharging residual; and an Nth waveform from the Nth charging / discharging residual. And determining an N-th charge / discharge command value for the N-th power storage system based on the N-th waveform.

According to the control device according to still another aspect of the present invention, when the power storage system including the power storage device and the power conversion device is configured by two units and the power system is stabilized, A control device for controlling each charge / discharge, and calculates a power storage site charge / discharge command value, which is a charge / discharge command value for the entire two power storage systems, for stabilizing the power system. A charge / discharge command value calculation unit, and a first charge / discharge command value for a first power storage system that performs short-cycle or long-cycle charge / discharge, and controls the first power storage system. A control unit, and a second charge / discharge command value for a second power storage system that performs a long-period or short-period charge / discharge with respect to the short-period or long-period charge / discharge by the first power storage system, respectively. A second control unit for transmitting and controlling the second power storage system, wherein the first control unit obtains upper and lower envelopes of the power storage site charge / discharge command value. Based on the upper and lower envelopes , a first waveform obtained by extracting a short-cycle or long-cycle component from the power storage site charge / discharge command value is obtained, and the first waveform is obtained using the first waveform. A first determination unit that determines a first charge / discharge command value for the first power storage system, wherein the second control unit is configured to control the power storage site as an input value to the first determination unit. A calculation unit for calculating a second charge / discharge residual from the charge / discharge command value and the first charge / discharge command value determined by the first determination unit; and a second charge / discharge residual from the second charge / discharge residual. Determining a waveform and, based on the second waveform, a second charging and discharging of the second power storage system. A second determination unit that determines a command value, characterized by having a.

  According to a control device according to still another aspect of the present invention, a configuration may be adopted in which a receiving unit that receives a power storage site charge / discharge command value from outside is provided instead of the above-described charge / discharge command value calculation unit. .

  A system according to an aspect of the present invention includes: a power storage system including the power storage device and the power conversion device; a power storage system including a plurality of power storage devices for stabilizing the power system; and a configuration including the control device described above. can do.

According to a method for controlling a power storage system including a plurality of power storage devices according to one embodiment of the present invention, the power storage device includes a power storage device and a power conversion device, and includes N (N is an integer of 3 or more) power devices. A method for controlling a power storage system for stabilizing a system, comprising: obtaining upper and lower envelopes of a power storage site charge / discharge command value, which is a charge / discharge command value for all N power storage systems. Based on the upper and lower envelopes , a first waveform that extracts the longest-period component from the power storage site charge / discharge command value is obtained, and the longest-period component is extracted based on the first waveform. A first charge / discharge command value for a first power storage system that performs charge / discharge is determined, and the power used for determining a (k−1) th (k is an integer of 2 or more and less than N) charge / discharge command value The storage site charge / discharge command value or the (k− ) And the (k−1) th charge / discharge command value, and calculates the kth charge / discharge residual, and calculates the upper and lower envelopes of the kth charge / discharge residual. based on the upper and lower envelope of charging and discharging residual of the k-th seek, seeking the first (k-1) waveform of the k extracting the components of the short period from the charge and discharge command value of the Based on the k-th waveform, a k-th charge / discharge command value for a k-th power storage system that performs charging / discharging in a cycle shorter than that of the (k-1) -th power storage system is determined. )) Calculating an Nth charge / discharge residual from the (N−1) th charge / discharge residual used in determining the charge / discharge command value and the (N−1) th charge / discharge command. Determining an Nth waveform from the Nth charge / discharge residual, and determining an Nth charge / discharge command value for the Nth power storage system based on the Nth waveform. And butterflies.

According to a method for controlling a power storage system including a plurality of power storage devices according to another embodiment of the present invention, the method includes a power storage device and a power conversion device, and includes N (N is an integer of 3 or more) units. A method for controlling a power storage system that stabilizes a power system by using a power storage site charge / discharge command value, which is a charge / discharge command value for the N power storage systems as a whole. the on the basis of the envelope of the upper and lower seek, seeking first waveform obtained by extracting the component of the shortest period from the power storage site discharge command value, based on the first waveform, the shortest A first charge / discharge command value for a first power storage system that performs periodic charge / discharge is determined, and is used to determine a (k−1) th (k is an integer of 2 or more and less than N) charge / discharge command value. The power storage site charge / discharge command value or the ( The k-th charge / discharge residual is calculated from the charge / discharge residual of (-1) and the (k-1) th charge / discharge command value, and the upper and lower envelopes of the k-th charge / discharge residual are calculated. based on the upper and lower envelope of charging and discharging residual of the first k seeking line, obtains the first (k-1) waveform of the k extracted a more long-period component discharge command value of , Determining a k-th charge / discharge command value for a k-th power storage system that performs charging / discharging at a longer cycle than the (k-1) -th power storage system based on the k-th waveform; The Nth charge / discharge residual is calculated from the (N-1) th charge / discharge residual used in determining the charge / discharge command value of (-1) and the (N-1) th charge / discharge command value. Determining an Nth waveform from the Nth charge / discharge residual, and determining an Nth charge / discharge command value for the Nth power storage system based on the Nth waveform. The features.

  ADVANTAGE OF THE INVENTION According to this invention, charging / discharging between electric power storage systems can be reduced, and it becomes possible by this to reduce the loss by charging / discharging between electric power storage systems.

1 is a configuration diagram of a power storage system according to an embodiment of the present invention. FIG. 2 is a configuration diagram of a control device according to the first embodiment when the power storage system is configured by two units. FIG. 2 is a configuration diagram of a control device according to the first embodiment when the power storage system includes three or more power storage systems. FIG. 3 is a diagram (part 1) for explaining output fluctuation suppression of a natural power supply for two power storage systems. It is FIG. (2) explaining the output fluctuation | variation suppression of the natural fluctuation power supply with respect to two electric power storage systems. It is FIG. (3) explaining the output fluctuation | variation suppression of the natural fluctuation power supply with respect to two electric power storage systems. It is FIG. (4) explaining the output fluctuation | variation suppression of the natural fluctuation power supply with respect to two electric power storage systems. It is a figure (the 1) which shows the waveform in each stage in the case of controlling from three cycles of output fluctuation for three electric power storage systems. It is a figure (the 2) which shows the waveform in each stage in the case of controlling from three cycles of output fluctuations for three electric power storage systems. FIG. 11 is a diagram (part 3) illustrating waveforms at each stage when the three power storage systems are suppressed from long-term output fluctuations. FIG. 10 is a diagram (part 4) illustrating waveforms at each stage when the three power storage systems are suppressed from long-term output fluctuations. It is a figure (the 5) which shows the waveform in each stage in the case of suppressing from a long cycle output fluctuation about three power storage systems. FIG. 13 is a diagram (part 6) illustrating waveforms at each stage when three power storage systems are suppressed from long-term output fluctuations. FIG. 9 is a configuration diagram of a control device according to a second embodiment in a case where two power systems are configured. FIG. 6 is a configuration diagram of a control device according to a second embodiment in a case where three or more power systems are configured. FIG. 3 is a diagram (part 1) for explaining output fluctuation suppression of a natural power supply for two power storage systems. It is FIG. (2) explaining the output fluctuation | variation suppression of the natural fluctuation power supply with respect to two electric power storage systems. It is FIG. (3) explaining the output fluctuation | variation suppression of the natural fluctuation power supply with respect to two electric power storage systems. It is FIG. (4) explaining the output fluctuation | variation suppression of the natural fluctuation power supply with respect to two electric power storage systems. It is a figure (the 1) which shows the waveform in each stage in the case of suppressing from short-term output fluctuation about three power storage systems. It is a figure (the 2) which shows the waveform in each stage in the case of suppressing from short-term output fluctuation about three power storage systems. It is a figure (the 3) which shows the waveform in each stage in the case of suppressing from short-term output fluctuation about three power storage systems. FIG. 11 is a diagram (part 4) illustrating waveforms at each stage when the three power storage systems are suppressed from short-term output fluctuations. FIG. 10 is a diagram (part 5) illustrating waveforms at each stage when the three power storage systems are suppressed from short-period output fluctuations. FIG. 11 is a diagram (part 6) illustrating waveforms at each stage when the three power storage systems are suppressed from short-term output fluctuations. FIG. 9 is a diagram for explaining a problem of the conventional technology.

Hereinafter, embodiments for carrying out the invention will be described in detail with reference to the drawings.
FIG. 1 is a configuration diagram of a power storage system according to an embodiment of the present invention. In the configuration diagram shown in FIG. 1, a natural power supply 6 such as a wind power generator 6A or a solar power generator 6B is connected to the power system 5. A plurality of power storage systems 1 are connected to the power system 5 to suppress output fluctuations of the natural fluctuation power supply 6. The power storage system 1 is configured with N (N is an integer of 2 or more) units, but FIG. 1 illustrates only three power storage systems 1 (1_1 to 1_3).

  The power storage system 1 has a power storage device 2 and a power conversion device 3, is connected to a power system 5 via an interconnection transformer 4, and is connected to a natural power supply 6 such as a wind power generation 6 </ b> A or a solar power generation 6 </ b> B. In order to cancel the output fluctuation, charge / discharge of electric power is performed.

The power storage device 2 performs charging and discharging of the power generated by the natural fluctuation power supply 6. The power storage device 2 is, for example, an EDLC, a secondary battery, a flywheel, compressed air, or the like.
The power conversion device 3 exchanges active power between the power system 5 and the power storage device 2. In the following description, the direction in which power is released from power storage device 2 is “positive”. The power conversion device 3 exchanges active power between the power system 5 and the power storage device 2 based on the active power command value from the control device 10.

  When the power storage device 2 is a secondary battery, a capacitor, or the like, the DC power of the secondary battery, the capacitor, or the like and the AC power of the power system 5 are bidirectionally converted. When the power storage device 2 is a flywheel, compressed air, or the like, the flywheel or the like is connected to the motor generator, and bidirectionally converts AC power on the motor generator side and AC power on the power system 5 side. .

  The control device 10 is based on the power storage site charge / discharge command values Po for the entire N power storage systems 1 obtained from the active power Pg of the natural fluctuation power supply 6 and the storage amounts Sb_1 to Sb_N of the N power storage devices 2. , Calculate the charge / discharge command values Po_1 to Po_N of each power storage system 1. The control device 10 controls the charging and discharging of each power storage system 1 by transmitting the charge / discharge command values Po_1 to Po_N of each power storage system 1 obtained by the calculation to the power conversion device 3 of each power storage system 1. .

  In each power storage system 1_n (n is an integer of 1 or more and N or less), the power storage device 2_n is charged / discharged according to the charge / discharge command value Po_n received from the control device 10. Thereby, the output of the natural fluctuation power supply 6 is smoothed.

  In FIG. 1, the power storage site charge / discharge command value Po is used by the power storage site charge / discharge command value calculation unit 20 </ b> _ <b> 1 to suppress the output fluctuation of the natural power supply 6. Although a configuration obtained by calculation from the power Pg is shown, the configuration is not limited to this. For example, the power storage site charge / discharge command value Po is calculated by an external system (load frequency control of the central power supply system) from the frequency fluctuation and power flow fluctuation generated in the power system 5 as a result of the output fluctuation of the natural fluctuation power supply 6. The control device 10 may be configured to acquire the power storage site charge / discharge command value Po by receiving the signal at the receiving unit, and use this.

  In addition, the control device 10, the power storage site charge / discharge command value calculation unit 20_1, and the control system of each device in FIG. 1 may be partially or wholly installed at a distance and controlled by communication. For example, when one power storage site is virtually configured by a plurality of distributed power storage systems and charge / discharge power of different periodic components is shared and output to each power storage system, a power storage site charge / discharge command is issued. It is also possible to mount the value calculation unit 20_1 and the control device 10 in a central computer and collectively calculate and distribute the charge / discharge command values Po_1 to Po_N to each power storage system by the central computer.

  Further, regarding the control device 10, the power storage site charge / discharge command value calculation unit 20_1, and the control system of each device, FIG. 1 illustrates a configuration assuming a form in which a digital control device, that is, a programmable controller is provided in a storage battery system. However, the method of realization is not limited to hardware, software, analog, and digital.

In the following, an example will be described in which the output fluctuation of the natural fluctuation power supply 6 in the power system 5 as shown in FIG. 1 is suppressed.
<First embodiment>
First, in the following, of the N power storage systems 1, the first unit (the power storage system 1_1 in FIG. 1) performs charging and discharging in the longest cycle, and the k-th unit has a shorter cycle than the (k-1) -unit. The case where the Nth unit (the power storage system 1_N) performs the shortest cycle charge and discharge will be described.

  In the present embodiment, the control device 10 sequentially calculates the command value Po_n and transmits the command value Po_n to the power storage system 1 in ascending order for n. How the control device 10 determines the charge / discharge command values Po_1 to Po_N for the respective power storage systems 1_1 to 1_N will be further described with reference to the drawings.

  FIG. 2 is a configuration diagram of the control device 10 when the power storage system 1 is configured by two units. The control device 10 illustrated in FIG. 2 calculates charge / discharge command values Po_1 and Po_2 of the two power storage systems 1_1 and 1_2, and transmits the calculated values to the power conversion devices 3 of the respective power storage systems.

  The power storage site charge / discharge command value calculation unit 20_1 of FIG. 2 calculates the power storage site charge / discharge command value Po from the active power Pg of the natural fluctuation power supply 6, and an output sharing control unit 30_1 serving as a first output sharing control unit. The power storage site charge / discharge command value Po is input to the power storage site. As described in the description of FIG. 1, the control device 10 according to the present embodiment includes the power storage site charge / discharge command value calculation unit 20 </ b> _ <b> 1 and may have a configuration in which the device itself calculates the command value Po. Alternatively, a command value Po calculated by another external system may be received and used.

  The control device 10 in FIG. 2 includes an output sharing control unit 30_1 as a first control unit and an output sharing control unit 30_2 as a second (= Nth) control unit. The control device 10 calculates the charge / discharge command values Po_1 and Po_2 of each of the power storage systems 1_1 and 1_2 from the input power storage site charge / discharge command values Po for the entire power storage system. Then, the charge / discharge of the power storage systems 1_1, 1_2 is controlled by transmitting the charge / discharge command values Po_1, Po_2 to the power conversion devices 3_1, 3_2 of the power storage systems 1_1, 1_2, respectively.

  Among these, the output sharing control unit 30_1 calculates the charge / discharge command value Po_1 that suppresses the output fluctuation in the longest cycle from the power storage site charge / discharge command value Po, and sends the charge / discharge command to the power conversion device 3_1 of the power storage system 1_1. Transmit the value Po_1. At the same time, the output sharing control unit 30_1 inputs the charge / discharge command value Po_1 to the charge / discharge residual calculation unit 20_2.

In the embodiment, when the command value Po_n is positive (+), discharging is instructed, and when the command value Po_n is negative (-), charging is instructed.
In the charge / discharge residual calculation unit 20_2, the output sharing control unit 30_2 determines whether the input signal (power storage site charge / discharge command value Po) to the output sharing control unit 30_1 as the first control unit and the output sharing control unit 30_1. A charge / discharge residual Pe_2 with respect to the charge / discharge command value Po_1 which is the output first command value is obtained. Then, the charge / discharge command value Po_2 for the power storage system 1_2 is determined using the obtained charge / discharge residual Pe_2.

  Each element constituting the control device 10 may be configured integrally or may be configured separately. For example, the output sharing control unit 30_1 and the output sharing control unit 30_2 can be incorporated in the same control device, or can be separately incorporated in different control devices. Similarly, for example, the charge / discharge residual calculation unit 20_2 can be integrated with the output sharing control unit 30_2 and incorporated in the same control device, or can be separately incorporated in different control devices.

FIG. 3 is a configuration diagram of the control device 10 when the power storage system 1 includes three or more power storage systems.
The control device 10 illustrated in FIG. 3 includes output sharing control units 30_1 to 30_N. As described in the above description, the control device 10 controls the entire power storage system 1 obtained from the active power Pg of the natural power supply 6 in the power storage site charge / discharge command value calculation unit 20_1 or in an external system. Command values Po_1 to Po_N of each of the power storage systems 1_1 to 1_N are calculated from the power storage site charge / discharge command values Po for the power storage sites. Then, the charge / discharge of the power storage systems 1_1 to 1_N is controlled by transmitting the charge / discharge command values Po_1 to Po_N to the power conversion devices 3 (3_1 to 3_N) of the power storage systems 1_1 to 1_N, respectively.

  N output sharing control units 30_1 to 30_N, which are first to Nth control units of the control device 10, are configured to output charge / discharge command values Po_1 to Po_N for the first to Nth units of the N power storage systems 1, respectively. Perform arithmetic and transmission.

  As compared with the configuration diagram of FIG. 2, first, the output sharing control unit 30_1, which is the first control unit, and the charge / discharge residual calculation unit 20_N, which is the Nth control unit, and the output sharing control unit 30_N The difference is that an output sharing control unit 30_k which is a control unit of k and a charge / discharge residual calculation unit 20_k (k is an integer of 2 or more and less than N) are provided.

  The charge / discharge residual calculation unit 20_k is determined by the charge / discharge residual Pe_k-1 which is an input value to the output sharing control unit 30_k-1 which is the (k-1) th control unit, and the output sharing control unit 30_k-1. A charge / discharge residual Pe_k is calculated from the charge / discharge command value Po_k-1. The output sharing control unit 30_k determines a command value Po_k for the power storage system 1_k using the charge / discharge residual Pe_k.

  Further, compared to the configuration of FIG. 2, the N-th control unit 30_N also includes a charge / discharge residual calculation unit 20_N, and performs the same processing as the charge / discharge residual calculation unit 20_k of the k-th control unit 30_k. That is, the charge / discharge residual calculation unit 20_N is determined by the charge / discharge residual Pe_N-1 which is an input value to the output sharing control unit 30_N-1 which is the (N-1) th control unit and the output sharing control unit 30_N-1. The residual with respect to the set command value Po_N-1 is calculated.

  Thus, the power storage site charge / discharge command value calculation unit 20_1 and the charge / discharge residual calculation units 20_k, 20_N each calculate the values Po, Pe_k, Pe_N to be input to the corresponding output sharing control unit 30. Since the operation is being performed, both of them are denoted by reference numeral “20” in FIGS.

  In this way, the control device 10 according to the present embodiment uses the charge / discharge command value Po for the entire power storage system 1 and the charge / discharge command for the power storage system 1_n in the output sharing control unit 30_n that is the control unit of each stage. The value Po_n is determined. Then, the above processing is repeated until the charge / discharge command value Po_N is obtained by the output sharing control unit 30_N, which is the final stage control unit.

  The output sharing control unit 30_n calculates the charge / discharge command value Po_n for the n-th power storage system 1 from the smoothed waveform of the result of performing the output fluctuation suppression in order from the first to the N-th power storage system 1 in the order of longer cycle. Will be done. As a result, in the power storage systems 1_1 to 1_N that perform charging and discharging according to the charge and discharge command values Po_1 to Po_N, charge and discharge commands of different periods are shared by the first to Nth units. In addition, the charge / discharge commands of the N power storage systems 1 are aligned by charging or discharging. Therefore, charging / discharging between the N power storage systems 1 does not occur, and loss due to charging / discharging between the power storage systems 1 is reduced.

  In the control device 10 having the configuration illustrated in FIGS. 2 and 3, a more specific example of how the output sharing control unit 30_n as the n-th control unit obtains the charge / discharge command value Po_n for the n-th power storage system 1 will be described. Will be described.

  The output sharing control unit 30_n includes a Bollinger band deriving unit 31_n, an upper / lower envelope selecting unit (hereinafter abbreviated as a selecting unit) 32_n, a charged amount correcting unit 33_n, and an output limiting unit 34_n. Here, it is assumed that n ≠ N.

  When n is an integer of 2 or more and less than N, first, in the output sharing control unit 30_n, the Bollinger band derivation unit 31_n calculates the Bollinger band of the charge / discharge residual Pe_n in the period of the past T1. Specifically, the Bollinger band derivation unit 31_n calculates the upper envelope Pe_max_n and the lower envelope Pe_min_n of the Bollinger band from the M_n latest data in the charge / discharge residual Pe_n input from the charge / discharge residual calculation unit 20_n. Ask. Here, the discrete M_n pieces of data correspond to the latest data in the period of the past T1.

  When n = 1, in the output sharing control unit 30_1, first, the Bollinger band deriving unit 31_1 calculates the Bollinger band of the power storage site charge / discharge command value Po in the past T1 period. Specifically, the Bollinger band deriving unit 31_1 calculates the upper envelope Pe_max_1 of the Bollinger band and the lower envelope from M_1 latest data in the power storage site charge / discharge command value Po input from the charge / discharge command value calculation unit 20_1. Find the line Pe_min_1. Here, M_1 pieces of discrete data correspond to the latest data in the period of the past T1.

  The number M_n of evaluation section data of the Bollinger band is set such that M_n decreases as n increases. By setting in this way, as described above, the charge / discharge command value Po_n can be calculated as a charge / discharge command value having a cycle shorter than the charge / discharge command value Po_n-1.

  When n is an integer of 1 or more and less than N, to obtain the upper and lower envelopes of the Bollinger band, first, the moving average calculation unit of the Bollinger band derivation unit 31_n calculates the charge / discharge residual Pe_n as an input signal. The moving average Pe_ave_n is calculated from the M_n latest data in. The moving average Pe_ave_n is given by the following equation. When n = 1, the input signal is calculated using the power storage site charge / discharge command value Po.

Here, the current value of the charge / discharge residual Pe_n is Pe_n (t), and the value at the point in time traced back by the period T1 is Pe_n (t−M_n + 1).

  The standard deviation calculating unit calculates the standard deviation σ_n from the M_n latest data in the charge / discharge residual Pe_n, which is the input signal, using the moving average Pe_ave_n of the above equation (1) obtained by the moving average calculating unit. . The standard deviation σ_n is given by the following equation.

Here, as for the standard deviation σ, in the case of a normal distribution, 68.27% of all data falls within ± 1σ from the average value. Within the range of ± 2σ from the average value, 94.45% of all data, 99.73% within ± 3σ, and 99.9999% within ± 6σ. From this, subsequently, the Bollinger band operation unit obtains the K standard deviation K * σ_n using the standard deviation σ_n (t) obtained by the standard deviation unit operation unit. Then, the upper envelope Pe_max_n and the lower envelope Pe_min_n are calculated by adding or subtracting the moving average Pe_ave_N (t) obtained by the moving average calculator to the K standard deviation. K is set at about 1 to 6.
Upper envelope: Pe_max_n (t) = Pe_ave_n (t) + K * σ_n (t) (3)
Lower envelope: Pe_min_n (t) = Pe_ave_n (t) -K * σ_n (t) (4)
The selection unit 32_n compares the upper envelope Pe_max_n and the lower envelope Pe_min_n at each time with the upper envelope Pe_max_n (t) and the lower envelope Pe_min_n (t) obtained by the Bollinger band derivation unit 31_n. Then, the selection unit 32_n selects one of the upper envelope, the lower envelope, and zero based on the comparison result, and outputs the signal Pr_n. Specifically, when both the upper envelope Pe_max_n and the lower envelope Pe_min_n are positive, the lower envelope Pe_min_n is selected. When both the upper envelope Pe_max_n and the lower envelope Pe_min_n are negative, the upper envelope Pe_max_n is selected. When the upper envelope Pe_max_n and the lower envelope Pe_min_n are separated into positive and negative, respectively, zero is selected. By the selection process of the selection unit 32_n, a signal Pr input to the output sharing control unit 30_n or a waveform Pr_n obtained by smoothing Pe_n is obtained.

  As shown in FIG. 3, in the embodiment, correction and restriction are further applied to the waveform Pr_n obtained by performing the selection processing in the selection unit 32_n. Specifically, correction based on the amount of stored power Sb_n of the power storage device 2_n of the power storage system 1_n and various restrictions on the power storage device 2_n and the power conversion device 3_n are added to the waveform Pr_n output from the selection unit 32_n.

  The storage amount correction unit 33_n generates the correction signal Sc_n such that the storage amount Sb_n of the power storage device 2_n approaches the target value So_n of the storage amount. The correction signal Sc_n is added to the output signal Pr_n of the selection unit 32_n. Thereby, the amount of stored power in power storage device 2_n is maintained in the intermediate region.

  Note that the charge / discharge direction of the command value Po_n (+ or-) may be different depending on the direction of the charge correction by the charge correction unit 33_n, but the direction of the charge / discharge command generally follows the charge or discharge. In addition, it is possible to reduce a loss caused by charging and discharging between the power storage systems 1.

  The output limiting unit 34_n generates a charge / discharge command value Po_n including these restrictions based on various restrictions of the power conversion device 3_n and the power storage device 2_n. The various restrictions here include, for example, a limiter, a change rate limiter, a filter for suppressing the change rate, a wait time for switching between charging and discharging, and the like. Thus, the charge / discharge command value Po_n of the power storage system 1_n is obtained.

  Similarly to the power storage amount correction, the positive / negative charging / discharging direction of the command value Po_n may be different, for example, via a rate-of-change limiter, depending on the restriction imposed by the output limiting unit 34_n. However, since the direction of the charge / discharge command is generally aligned with the charge or discharge, it is possible to reduce the loss caused by charge / discharge between the power storage systems 1.

  As described above, the charge / discharge command value Po_n output from the output sharing control unit 30_n is not only transmitted to the power storage system 1_n, but also input to the charge / discharge residual calculation unit 20_n + 1. In this way, the control device 10 obtains each charge / discharge command value Po_n in order from the power storage system 1 that performs charge / discharge in the longest cycle.

  In the embodiment, as shown in FIG. 3, the output sharing control unit 30_N of n = N performs the process of deriving the upper and lower envelopes of the Bollinger band, and the derived upper and lower envelopes and zero. The process of selecting is not performed. Only the process of correcting the power storage amount in the power storage amount correction unit 33_N and the process of restricting by the output restriction unit 34_N are executed. However, the output sharing control unit 30_N where n = N may be configured to execute the deriving process and the selecting process of the upper envelope and the lower envelope.

  A specific example of how the power storage system 1 including a plurality of units suppresses output fluctuations based on the command values Po_1 to Po_N from the control device 10 having the configuration illustrated in FIGS. 2 and 3 will be described with reference to the drawings. A description is given below.

  4A to 4D are diagrams illustrating the suppression of output fluctuation of the natural fluctuation power supply 6 for the two power storage systems 1_1 and 1_2. As described in the description of FIG. 1, here, of the two power storage systems 1, the power storage system 1_1 performs charging and discharging in a long cycle, and the power storage system 1_2 performs charging and discharging in a short cycle.

  FIG. 4A illustrates a power storage site charge / discharge command value Po obtained by the charge / discharge command value calculation unit 20_1 in FIG. As described above, the power storage site charge / discharge command value Po is a charge / discharge command value required for the entire two power storage systems 1_1 and 1_2 with respect to the active power Pg of the natural fluctuation power supply 6.

As shown in the figure, finally, the combined output Out_l of the active power Pg of the natural fluctuation power supply 6 and the charge / discharge power from the two power storage systems 1 is finally obtained by the two power storage systems 1. Suppress to a waveform that gradually decreases. In this case, among the total required power storage site discharge command value Po system, space beyond synthesis output OUT_L, i.e., until time _{t a1,} and a period from time _{t a2} ~ time _{t a3,} the energy storage system 1_1 , 1_2. Area electric power storage site discharge command value Po is lower than the combined output OUT_L, i.e., time _{t a1} ~ time _{t a2,} a period after time _{t a3,} an area to be discharged from the power storage system 1_1.

  FIG. 4B shows the upper envelope Pe_max_1 and the lower side of the power storage site charging / discharging command value Po shown in FIG. 4A, which are derived by the Bollinger band deriving unit 31_1 of the output sharing control unit 30_1 which is the first output sharing control unit. 2 shows an envelope Pe_min_1.

The Bollinger band deriving unit 31_1 first calculates the moving average Pe_ave_1 by substituting the M latest data of the past period T into the above equation (1).
Then, the moving average Pe_ave_1 and the M most recent data of the past period T are substituted into the above equation (2) to calculate the standard deviation σ. In FIG. 4B, for simplicity, the standard deviation σ_1 is represented by “σ”, and the K standard deviation is represented by “Kσ”.

  In this way, the K standard deviations + Kσ_1 and −Kσ_1 are obtained from the predetermined value K. When the K standard deviation and the moving average Pe_ave_1 are substituted into the equations (3) and (4), respectively, the upper envelope Pe_max_1 and the lower envelope Pe_min_1 are obtained. Is found.

FIG. 4C shows a charge / discharge command value Po_1 derived by the output sharing control unit 30_1.
The selection unit 32_1 of the output sharing control unit 30_1 selects the upper envelope Pe_max_1, the lower envelope Pe_min_1, or zero by comparing the upper envelope Pe_max_1 and the lower envelope Pe_min_1 shown in FIG. 4B. In the example of FIG. 4C, the time _{t c1} lower envelope Pe_min_1 up, until the time _{t c1} ~ time _{t c2} zero, after the time _{t c2} upper envelope Pe_max_1 is selected. It can be confirmed that the charge / discharge command value Po_1 generated as a result of the selection unit 32_1 performing such a selection suppresses the fluctuation of the long-period component included in the power storage site charge / discharge command value Po. Here, it is assumed that there is no influence of the correction by the charged amount correction unit 33_1 and the limitation by the output restriction unit 34_1, and the output signal Pr_1 of the selection unit 32_1 and the charge / discharge command value Po_1 are equal.

FIG. 4D shows a charge / discharge command value Po_2 derived by the output sharing control unit 30_2 based on the charge / discharge residual Pe_2 calculated by the charge / discharge residual calculation unit 20_2.
The output sharing control unit 30_2, which is the second output sharing control unit, performs a short-term operation based on the charging / discharging residual Pe_2, which is a waveform after the power storage system 1_1 has suppressed a long-period output fluctuation by the charging / discharging command value Po_1. A command value Po_2 for suppressing the output fluctuation of the cycle is obtained. When output fluctuation suppression is performed in the power storage system 1_2 based on the charge / discharge command value Po_2, finally, the combined power Out_l of the active power Pg of the natural fluctuation power supply 6 and the charge / discharge power of the entire two power storage systems 1 is obtained. And the waveforms as shown in FIG. Here, it is assumed that there is no influence of the correction by the power storage correction unit 33_2 and the restriction by the output restriction unit 34_2, and the charge / discharge residual Pe_2 is equal to the charge / discharge command value Po_2.

  As described above, the two power storage systems 1_1 and 1_2 suppress the long-period fluctuation of the output fluctuation of the natural fluctuation power supply 6 such as the wind power generation 6A with the charge and discharge command value Po_1 in the power storage system 1_1, Short-period fluctuations are suppressed by the charge / discharge command value Po_2 in the power storage system 1_2. Since the power storage systems 1_1 and 1_2 share charge / discharge commands having different periods, the charge / discharge commands are charged or discharged. Therefore, charge and discharge do not occur between the two power storage systems 1_1 and 1_2, and loss due to this can be reduced.

  FIGS. 4A to 4D show a case where the charge / discharge command values Po_1 and Po_2 are obtained by calculation for each of the two power storage systems 1_1 and 1_2 to suppress the long-cycle and short-cycle fluctuations, respectively. However, as described above, the present embodiment is also applicable to a case where the number of power storage systems 1_1 to 1_N is three or more.

How the output fluctuation is suppressed when the power storage system includes three or more power storage systems will be described with reference to FIGS. 5A to 5F.
5A to 5F are diagrams showing waveforms at each stage when the output fluctuations of the three power storage systems 1_1 to 1_3 are suppressed. Here, the waveform at each stage when the command value is obtained in order from the long-term output fluctuation is shown. That is, the power storage system 1_1 performs output fluctuation suppression in the longest cycle, and sequentially performs output fluctuation suppression in shorter cycles from the power storage system 1_1 to the power storage system 1_3.

  5A shows the waveform input to the control device 10, that is, the original waveform of the power storage site charge / discharge command value Po calculated by the power storage site charge / discharge command value calculation unit 20_1.

  FIG. 5B shows that the output sharing control unit 30_1, which is the first control unit, derives the Bollinger band from the waveform of FIG. 5A by the method described above to obtain the upper and lower envelopes, and obtains the upper and lower envelopes. This is a waveform obtained by selecting one of the envelope or zero by the above method. 5B is a waveform (power storage site charge / discharge command value Po) of FIG. 5A, a series 2 is an upper envelope, a series 3 is a lower envelope, and a series 4 is a waveform selected by the selection unit 32_1. It is.

  FIG. 5C shows a waveform of the charge / discharge command value Po_1 determined by the output sharing control unit 30_1 which is the first control unit. The waveform shown in FIG. 5C is obtained by adding the above-described correction and restriction to the waveform of series 4 in FIG. 5B by the charged amount correction unit 33_1 and the output restriction unit 34_1 as necessary. The charge fluctuation command value Po_1 suppresses the output fluctuation in the longest cycle.

  FIG. 5D is the same as FIG. 5B for the waveform (charge / discharge residual Pe_2) after the output sharing control unit 30_2, which is the second control unit, performs the output fluctuation suppression by the charge / discharge command value Po_1 of FIG. 5C. 3 shows a waveform obtained by performing the above processing. That is, the Bollinger band is derived from the waveform (charge / discharge residual Pe_2) after the output fluctuation is suppressed by the charge / discharge command value Po_1, the upper / lower envelope is calculated, and the upper envelope, the lower envelope or The waveform obtained by selecting one from zero is shown. Sequences 1 to 4 are the same as those in FIG. 5B.

  FIG. 5E shows a waveform of the charge / discharge command value Po_2 determined by the output sharing control unit 30_2 which is the second control unit. It is the same as FIG. 5C that the waveform of FIG. 5E is obtained by adding the above-described correction and limitation by the charged amount correction unit 33_2 and the output restriction unit 34_2 to the waveform of the series 4 in FIG. 5D as necessary. is there. The charge / discharge command value Po_2 suppresses output fluctuations in a cycle shorter than that of the power storage system 1_1.

  FIG. 5F shows a waveform of the charge / discharge command value Po_3 determined by the output sharing control unit 30_3 as the third control unit. As described above with reference to FIG. 3, the output sharing control unit 30_3 of the final stage does not perform processing such as derivation of a Bollinger band, and the charge / discharge command value Po_2 determined by the output sharing control unit 30_2 of the preceding stage. And a charge / discharge residual Pe_3 obtained by a difference between the charge / discharge residual Pe_2 input to the output sharing control unit 30_2, and as needed, correct or limit the charged amount correction unit 33_3 or the output restriction unit 34_3. Thus, the charge / discharge command value Po_3 is determined. With the charge / discharge command value Po_3, output fluctuations in a cycle shorter than the power storage system 1_2 (the shortest cycle) are suppressed.

  5A to 5F exemplify a case in which the power storage system 1 is configured with three units. However, even when the number of power storage systems 1 is four or more, the charge / discharge command value Po_n for each power storage system 1 is similarly calculated. Is possible.

  As described above, according to the present embodiment, in order to stabilize the fluctuation of the power system, the power storage system 1 is configured by a plurality of units, and the output fluctuation suppression of a different cycle is assigned to each power storage system 1. In this case, the output fluctuation is suppressed in order from the long-term output fluctuation. The charge / discharge command value Po_n of the n-th unit is obtained from the first unit to the N-th unit based on the waveform smoothed by suppressing the output fluctuation in order from the one with the longest cycle. When the command values to be transmitted to the power conversion devices 3 of the respective power storage systems 1 are obtained in this manner, the command values are charged or discharged among all the power storage systems 1. Therefore, charging / discharging between the plurality of power storage systems 1 does not occur, and loss due to charging / discharging between the power storage systems 1 is reduced.

<Second embodiment>
Next, in the following, of the N power storage systems 1, the first unit (the power storage system 1_1 in FIG. 1) performs charging and discharging in the shortest cycle, and the k-th unit has a longer cycle than the k-1th unit. The case where charging and discharging are performed and the Nth unit (the power storage system 1_N) performs charging and discharging in the longest cycle will be described.

  In the present embodiment, the control device 10 sequentially calculates the charge / discharge command value Po_n and transmits the same to the power storage system 1 in ascending order for n. How the control device 10 determines the charge / discharge command values Po_1 to Po_N for the respective power storage systems 1_1 to 1_N will be further described with reference to the drawings.

  FIG. 6 is a configuration diagram of the control device 10 when the power storage system 1 is composed of two units. The control device 10 illustrated in FIG. 6 calculates the charge / discharge command values Po_1 and Po_2 of the two power storage systems 1_1 and 1_2 and transmits the calculated values to the power converter 3 of each power storage system.

  6 calculates a power storage site charge / discharge command value Po from the active power Pg of the natural fluctuation power supply 6, and outputs a power sharing control unit 30_1 serving as a first output sharing control unit. The power storage site charge / discharge command value Po is input to the power storage site. As described in the description of FIG. 1, the control device 10 according to the present embodiment includes the power storage site charge / discharge command value calculation unit 20 </ b> _ <b> 1 and may have a configuration in which the device itself calculates the command value Po. Alternatively, a command value Po calculated by another external system may be received and used.

  The control device 10 of FIG. 6 includes an output sharing control unit 30_1 as a first control unit and an output sharing control unit 30_2 as a second (= Nth) control unit. The control device 10 calculates the charge / discharge command values Po_1 and Po_2 of each of the power storage systems 1_1 and 1_2 from the input power storage site charge / discharge command values Po for the entire power storage system. Then, the charge / discharge of the power storage systems 1_1, 1_2 is controlled by transmitting the charge / discharge command values Po_1, Po_2 to the power conversion devices 3_1, 3_2 of the power storage systems 1_1, 1_2, respectively.

  Among these, the output sharing control unit 30_1 calculates the charge / discharge command value Po_1 that suppresses the output fluctuation in the shortest cycle from the power storage site charge / discharge command value Po, and sends the charge / discharge command to the power conversion device 3_1 of the power storage system 1_1. Transmit the value Po_1. At the same time, the output sharing control unit 30_1 inputs the charge / discharge command value Po_1 to the charge / discharge residual calculation unit 20_2.

In the embodiment, when the command value Po_n is positive (+), discharging is instructed, and when the command value Po_n is negative (-), charging is instructed.
In the charge / discharge residual calculation unit 20_2, the output sharing control unit 30_2 determines whether the input signal (power storage site charge / discharge command value Po) to the output sharing control unit 30_1 as the first control unit and the output sharing control unit 30_1. A charge / discharge residual Pe_2 with respect to the charge / discharge command value Po_1 which is the output first command value is obtained. Then, the charge / discharge command value Po_2 for the power storage system 1_2 is determined using the obtained charge / discharge residual Pe_2.

  Each element constituting the control device 10 may be configured integrally or may be configured separately. For example, the output sharing control unit 30_1 and the output sharing control unit 30_2 can be incorporated in the same control device, or they can be separately incorporated in different control devices. Similarly, for example, the charge / discharge residual calculation unit 20_2 can be integrated with the output sharing control unit 30_2 and incorporated in the same control device, or can be separately incorporated in different control devices.

FIG. 7 is a configuration diagram of the control device 10 when the power storage system 1 includes three or more power storage systems.
The control device 10 illustrated in FIG. 7 includes output sharing control units 30_1 to 30_N. As described in the above description, the control device 10 controls the entire power storage system 1 obtained from the active power Pg of the natural power supply 6 in the power storage site charge / discharge command value calculation unit 20_1 or in an external system. Command values Po_1 to Po_N of each of the power storage systems 1_1 to 1_N are calculated from the power storage site charge / discharge command values Po for the power storage sites. Then, the charge / discharge of the power storage systems 1_1 to 1_N is controlled by transmitting the charge / discharge command values Po_1 to Po_N to the power conversion devices 3 (3_1 to 3_N) of the power storage systems 1_1 to 1_N, respectively.

  N output sharing control units 30_1 to 30_N, which are first to Nth control units of the control device 10, are configured to output charge / discharge command values Po_1 to Po_N for the first to Nth units of the N power storage systems 1, respectively. Perform arithmetic and transmission.

  Compared with the configuration diagram of FIG. 6, first, the output sharing control unit 30_1 as the first control unit and the charge / discharge residual calculation unit 20_N as the Nth control unit and the output sharing control unit 30_N The difference is that an output sharing control unit 30_k which is a control unit of k and a charge / discharge residual calculation unit 20_k (k is an integer of 2 or more and less than N) are provided.

  The charge / discharge residual calculation unit 20_k is determined by the charge / discharge residual Pe_k-1 which is an input value to the output sharing control unit 30_k-1 which is the (k-1) th control unit, and the output sharing control unit 30_k-1. A charge / discharge residual Pe_k is calculated from the charge / discharge command value Po_k-1. The output sharing control unit 30_k determines a command value Po_k for the power storage system 1_k using the charge / discharge residual Pe_k.

  6, the N-th control unit 30_N also includes a charge / discharge residual calculation unit 20_N, and performs the same processing as the charge / discharge residual calculation unit 20_k of the k-th control unit 30_k. That is, the charge / discharge residual calculation unit 20_N is determined by the charge / discharge residual Pe_N-1 which is an input value to the output sharing control unit 30_N-1 which is the (N-1) th control unit and the output sharing control unit 30_N-1. The residual with respect to the set command value Po_N-1 is calculated.

  Thus, the power storage site charge / discharge command value calculation unit 20_1 and the charge / discharge residual calculation units 20_k, 20_N each calculate the values Po, Pe_k, Pe_N to be input to the corresponding output sharing control unit 30. Since the operation is being performed, both of them are denoted by reference numeral “20” in FIGS.

  In this way, the control device 10 according to the present embodiment uses the charge / discharge command value Po for the entire power storage system 1 and the charge / discharge command for the power storage system 1_n in the output sharing control unit 30_n that is the control unit of each stage. The value Po_n is determined. Then, the above processing is repeated until the charge / discharge command value Po_N is obtained by the output sharing control unit 30_N, which is the final stage control unit.

  The output sharing control unit 30_n calculates the charge / discharge command value Po_n for the n-th power storage system 1 from the smoothed waveform obtained by performing the output fluctuation suppression in order from the shortest cycle to the N-th power storage system 1. Will be done. As a result, in the power storage systems 1_1 to 1_N that perform charging and discharging according to the charge and discharge command values Po_1 to Po_N, charge and discharge commands of different periods are shared by the first to Nth units. In addition, the charge / discharge commands of the N power storage systems 1 are aligned by charging or discharging. Therefore, charging / discharging between the N power storage systems 1 does not occur, and loss due to charging / discharging between the power storage systems 1 is reduced.

  In the control device 10 having the configuration illustrated in FIGS. 6 and 7, a more specific example of how the output sharing control unit 30_n, which is the n-th control unit, obtains the charge / discharge command value Po_n for the n-th power storage system 1 will be described. Will be described.

  The output sharing control unit 30_n includes a Bollinger band deriving unit 31_n, an upper / lower envelope selecting unit (hereinafter abbreviated as a selecting unit) 32_n, a charged amount correcting unit 33_n, an output limiting unit 34_n, and a charge / discharge command value calculating unit 35_n. Have. Here, it is assumed that n ≠ N.

  When n is an integer of 2 or more and less than N, first, in the output sharing control unit 30_n, the Bollinger band derivation unit 31_n calculates the Bollinger band of the charge / discharge residual Pe_n in the period of the past T1. Specifically, the Bollinger band deriving unit 31_n calculates the upper envelope Pe_max_n and the lower envelope Pe_min_n of the Bollinger band from the M_n latest data in the charging / discharging residual Pe_n input from the charging / discharging residual calculator 20_n. Ask. Here, the discrete M_n pieces of data correspond to the latest data in the period of the past T1.

  When n = 1, in the output sharing control unit 30_1, first, the Bollinger band deriving unit 31_1 calculates the Bollinger band of the power storage site charge / discharge command value Po in the past T1 period. Specifically, the Bollinger band deriving unit 31_1 calculates the upper envelope Pe_max_1 of the Bollinger band and the lower envelope from M_1 latest data in the power storage site charge / discharge command value Po input from the charge / discharge command value calculation unit 20_1. Find the line Pe_min_1. Here, M_1 pieces of discrete data correspond to the latest data in the period of the past T1.

  The number M_n of evaluation section data of the Bollinger band is set so that M_n increases as n increases. By setting in this way, a charge / discharge command value having a cycle longer than the charge / discharge command value Po_n-1 can be calculated as described above.

  When n is an integer of 1 or more and less than N, to obtain the upper and lower envelopes of the Bollinger band, first, the moving average calculation unit of the Bollinger band derivation unit 31_n calculates the charge / discharge residual Pe_n as an input signal. The moving average Pe_ave_n is calculated from the M_n latest data in. The moving average Pe_ave_n is given by the following equation. When n = 1, the input signal is calculated using the power storage site charge / discharge command value Po.

Here, the current value of the charge / discharge residual Pe_n is Pe_n (t), and the value at the point in time traced back by the period T1 is Pe_n (t−M_n + 1).

  The standard deviation calculating unit calculates the standard deviation σ_n from the M_n latest data in the charge / discharge residual Pe_n, which is the input signal, using the moving average Pe_ave_n of the above equation (5) obtained by the moving average calculating unit. . The standard deviation σ_n is given by the following equation.

Here, as for the standard deviation σ, in the case of a normal distribution, 68.27% of all data falls within ± 1σ from the average value. Within the range of ± 2σ from the average value, 94.45% of all data, 99.73% within ± 3σ, and 99.9999% within ± 6σ. From this, subsequently, the Bollinger band operation unit obtains the K standard deviation K * σ_n using the standard deviation σ_n (t) obtained by the standard deviation unit operation unit. Then, the upper envelope Pe_max_n and the lower envelope Pe_min_n are calculated by adding or subtracting the moving average Pe_ave_N (t) obtained by the moving average calculator to the K standard deviation. K is set at about 1 to 6.
Upper envelope: Pe_max_n (t) = Pe_ave_n (t) + K * σ_n (t) (7)
Lower envelope: Pe_min_n (t) = Pe_ave_n (t) -K * σ_n (t) (8)
The selection unit 32_n compares the upper envelope Pe_max_n and the lower envelope Pe_min_n at each time with the upper envelope Pe_max_n (t) and the lower envelope Pe_min_n (t) obtained by the Bollinger band derivation unit 31_n. Then, the selection unit 32_n selects one of the upper envelope, the lower envelope, and zero based on the comparison result, and outputs the signal Pr_n. Specifically, when both the upper envelope Pe_max_n and the lower envelope Pe_min_n are positive, the lower envelope Pe_min_n is selected. When both the upper envelope Pe_max_n and the lower envelope Pe_min_n are negative, the upper envelope Pe_max_n is selected. When the upper envelope Pe_max_n and the lower envelope Pe_min_n are separated into positive and negative, respectively, zero is selected. By the selection process of the selection unit 32_n, a signal Pr input to the output sharing control unit 30_n or a waveform Pr_n obtained by smoothing Pe_n is obtained.

  When n is an integer greater than or equal to 1 and less than N, the charge / discharge command value calculator 35_n outputs an input signal to the output sharing controller 30_n (when n = 1, the power storage site charge / discharge command value Po, n is 2 or more and N In the case of an integer less than, the difference between the charge / discharge residual Pe_n) and the output signal Pr_n of the selector 32_n is calculated and output.

  As shown in FIG. 7, in the embodiment, the waveform obtained by the charge / discharge command value calculation unit 35_n is further corrected and restricted. Specifically, the waveform output from the charge / discharge command value calculation unit 35_n is corrected based on the amount of power Sb_n stored in the power storage device 2_n of the power storage system 1_n, and various restrictions are imposed on the power storage device 2_n and the power conversion device 3_n. Add.

  The storage amount correction unit 33_n generates the correction signal Sc_n such that the storage amount Sb_n of the power storage device 2_n approaches the target value So_n of the storage amount. The correction signal Sc_n is added to the output signal Pr_n of the charge / discharge command value calculator 35_n. Thereby, the amount of stored power in power storage device 2_n is maintained in the intermediate region.

  Note that, depending on the direction of the charge correction by the charge correction unit 33_n, the positive / negative (+ or −) of the command value Po_n, that is, the charge / discharge direction may be different, but the direction of the charge / discharge command is generally aligned with the charge or discharge. Therefore, it is possible to reduce a loss caused by charging and discharging between the power storage systems 1.

  The output limiting unit 34_n generates a charge / discharge command value Po_n including these restrictions based on various restrictions of the power conversion device 3_n and the power storage device 2_n. The various restrictions here include, for example, a limiter, a change rate limiter, a filter for suppressing the change rate, a wait time for switching between charging and discharging, and the like. Thus, the charge / discharge command value Po_n of the power storage system 1_n is obtained.

  As in the case of the power storage amount correction, depending on the restrictions imposed by the output limiting unit 34_n, the sign Po_n of the command value, that is, the charge / discharge direction may be different, for example, via a change rate limiter. However, since the direction of the charge / discharge command is generally aligned with the charge or discharge, it is possible to reduce the loss caused by charge / discharge between the power storage systems 1.

  As described above, the charge / discharge command value Po_n output from the output sharing control unit 30_n is not only transmitted to the power storage system 1_n, but also input to the charge / discharge residual calculation unit 20_n + 1. In this way, the control device 10 obtains each charge / discharge command value Po_n in order from the power storage system 1 that performs charge / discharge in the shortest cycle.

  In the embodiment, as illustrated in FIG. 7, the output sharing control unit 30_N of n = N performs the process of deriving the upper and lower envelopes of the Bollinger band, and the derived upper and lower envelopes and zero. The process of selecting is not performed. Only the process of correcting the power storage amount in the power storage amount correction unit 33_N and the process of restricting by the output restriction unit 34_N are executed. However, the output sharing control unit 30_N where n = N may be configured to execute the deriving process and the selecting process of the upper envelope and the lower envelope.

  A specific example of how the power storage system 1 including a plurality of units suppresses output fluctuations based on the command values Po_1 to Po_N from the control device 10 having the configuration illustrated in FIGS. 6 and 7 will be described with reference to the drawings. A description is given below.

  8A to 8D are diagrams illustrating the suppression of output fluctuation of the natural fluctuation power supply 6 for the two power storage systems 1_1 and 1_2. As described in the description of FIG. 1, here, of the two power storage systems 1, the power storage system 1_1 performs charging and discharging in a short cycle, and the power storage system 1_2 performs charging and discharging in a long cycle.

  FIG. 8A illustrates a power storage site charge / discharge command value Po obtained by the charge / discharge command value calculation unit 20_1 in FIG. As described above, the power storage site charge / discharge command value Po is a charge / discharge command value required for the entire two power storage systems 1_1 and 1_2 with respect to the active power Pg of the natural fluctuation power supply 6.

As shown in the figure, finally, the combined output Out_l of the active power Pg of the natural fluctuation power supply 6 and the charge / discharge power from the two power storage systems 1 is finally obtained by the two power storage systems 1. Suppress to a waveform that gradually decreases. In this case, among the total required power storage site discharge command value Po system, space beyond synthesis output OUT_L, i.e., until time _{t a1,} and a period from time _{t a2} ~ time _{t a3,} the energy storage system 1_1 , 1_2. Area electric power storage site discharge command value Po is lower than the combined output OUT_L, i.e., time _{t a1} ~ time _{t a2,} a period after time _{t a3,} an area to be discharged from the power storage system 1_1.

  FIG. 8B shows the upper envelope Pe_max_1 and the lower side of the power storage site charging / discharging command value Po shown in FIG. 8A, which are derived by the Bollinger band deriving unit 31_1 of the output sharing control unit 30_1 which is the first output sharing control unit. 2 shows an envelope Pe_min_1.

The Bollinger band deriving unit 31_1 first calculates the moving average Pe_ave_1 by substituting the M latest data of the past period T into the above equation (5).
Then, the moving average Pe_ave_1 and the M most recent data of the past period T are substituted into the above equation (6) to calculate the standard deviation σ. In FIG. 8B, for simplicity, the standard deviation σ_1 is represented by “σ”, and the K standard deviation is represented by “Kσ”.

  In this way, K standard deviations + Kσ_1 and −Kσ_1 are obtained from the predetermined value K, and when the K standard deviation and the moving average Pe_ave_1 are substituted into the equations (7) and (8), respectively, the upper envelope Pe_max_1 and the lower envelope Pe_min_1 are obtained. Is found.

FIG. 8C shows a waveform Pr_1 derived by the charge / discharge command value calculation unit 35_1.
The selection unit 32_1 of the output sharing control unit 30_1 selects the upper envelope Pe_max_1, the lower envelope Pe_min_1, or zero by comparing the upper envelope Pe_max_1 and the lower envelope Pe_min_1 shown in FIG. 8B. In the example of FIG. 8C, the time _{t c1} lower envelope Pe_min_1 up, until the time _{t c1} ~ time _{t c2} zero, after the time _{t c2} upper envelope Pe_max_1 is selected, Pr_1 is generated.

  FIG. 8D shows a charge / discharge command value calculation unit 35_1 of the output sharing control unit 30_1, a power storage site charge / discharge command value Po that is an input signal to the output sharing control unit 30_1, and Pr_1 that is an output signal of the selection unit 32_1. Shows the charge / discharge command value Po_1 obtained from the difference between the two.

  By subtracting Pr_1, which is a long-period output fluctuation signal, from the power storage site charge / discharge command value Po, the charge / discharge command value Po_1 becomes a signal for suppressing short-period output fluctuation. It can be confirmed that the charge / discharge command value Po_1 generated by the output sharing control unit 30_1 suppresses the fluctuation of the short-cycle component included in the power storage site charge / discharge command value Po.

  Here, it is assumed that there is no influence of the correction by the charged amount correction unit 33_1 and the limitation by the output limit unit 34_1, and the output signal of the charge / discharge command value calculation unit 35_1 is equal to the charge / discharge command value Po_1.

FIG. 8D shows a charge / discharge command value Po_2 derived by the output sharing control unit 30_2 based on the charge / discharge residual Pe_2 calculated by the charge / discharge residual calculation unit 20_2.
Here, it is assumed that there is no influence of the correction by the charged amount correction unit 33_2 and the limitation by the output restriction unit 34_2, and the charge / discharge residual Pe_2 is equal to the charge / discharge command value Po_2.

  The output sharing control unit 30_2, which is the second output sharing control unit, is configured to perform a long operation based on the charge / discharge residual Pe_2, which is a waveform after the short-period output fluctuation is suppressed in the power storage system 1_1 by the charge / discharge command value Po_1. A charge / discharge command value Po_2 for suppressing a cycle output fluctuation is obtained. When output fluctuation suppression is performed in the power storage system 1_2 based on the charge / discharge command value Po_2, finally, the combined power Out_l of the active power Pg of the natural fluctuation power supply 6 and the charge / discharge power of the entire two power storage systems 1 is obtained. And the waveforms as shown in FIG.

  As described above, the two power storage systems 1_1 and 1_2 suppress the short-period fluctuation of the output fluctuation of the natural fluctuation power supply 6 such as the wind power generation 6A with the charge and discharge command value Po_1 in the power storage system 1_1. Long-period fluctuations are suppressed by the charge / discharge command value Po_2 in the power storage system 1_2. Since the power storage systems 1_1 and 1_2 share charge / discharge commands having different periods, the charge / discharge commands are charged or discharged. Therefore, charge and discharge do not occur between the two power storage systems 1_1 and 1_2, and loss due to this can be reduced.

  FIGS. 8A to 8D show a case where the charge / discharge command values Po_1 and Po_2 are obtained by calculation for each of the two power storage systems 1_1 and 1_2 to suppress the short-cycle and long-cycle fluctuations, respectively. However, as described above, the present embodiment is also applicable to a case where the number of power storage systems 1_1 to 1_N is three or more.

How the output fluctuation is suppressed when the power storage system includes three or more power storage systems will be described with reference to FIGS. 9A to 9F.
9A to 9F are diagrams illustrating waveforms at each stage when the output fluctuations of the three power storage systems 1_1 to 1_3 are suppressed. Here, the waveform at each stage when the command value is obtained in order from the short-period output fluctuation is shown. That is, the power storage system 1_1 performs output fluctuation suppression in the shortest cycle, and sequentially performs output fluctuation suppression in a longer cycle from the power storage system 1_1 to the power storage system 1_3.

  9A shows a waveform input to the control device 10, that is, an original waveform of the power storage site charge / discharge command value Po calculated by the power storage site charge / discharge command value calculation unit 20_1.

  FIG. 9B shows that the output sharing control unit 30_1, which is the first control unit, derives a Bollinger band from the waveform of FIG. 9A by the method described above to obtain upper and lower envelopes. This is a waveform obtained by selecting one of the envelope or zero by the above method. 9B is a waveform (power storage site charge / discharge command value Po) of FIG. 9A, a series 2 is an upper envelope, a series 3 is a lower envelope, and a series 4 is a waveform selected by the selection unit 32_1.

  FIG. 9C shows a waveform of the charge / discharge command value Po_1 determined by the output sharing control unit 30_1 which is the first control unit. The waveform (Pr_1) of series 4 is subtracted from the series 1 (power storage site charge / discharge command value Po) of FIG. 9B, and the above-described correction and limitation are performed by the storage amount correction unit 33_1 and the output restriction unit 34_1 as necessary. With this addition, the waveform shown in FIG. 9C is obtained. The shortest cycle output fluctuation is suppressed by the charge / discharge command value Po_1.

  FIG. 9D is the same as FIG. 9B for the waveform (charge / discharge residual Pe_2) after the output sharing control unit 30_2 as the second control unit has performed the output fluctuation suppression by the charge / discharge command value Po_1 of FIG. 9C. 3 shows a waveform obtained by performing the above processing. That is, a Bollinger band is derived from the waveform (charge / discharge residual Pe_2) after the output fluctuation is suppressed by the charge / discharge command value Po_1, the upper and lower envelopes are calculated, and the upper and lower envelopes are calculated. Alternatively, a waveform obtained by selecting one from zero is shown. Sequences 1 to 4 are the same as those in FIG. 9B.

  FIG. 9E shows a waveform of the charge / discharge command value Po_2 determined by the output sharing control unit 30_2 which is the second control unit. The waveform (Pr_2) of series 4 is subtracted from the series 1 (charge / discharge residual Pe_2) of FIG. 9D, and the above-described correction and limitation are added by the charged amount correction unit 33_2 and the output restriction unit 34_2 as necessary. Obtaining the waveform of FIG. 9E is the same as in FIG. 9C. With the charge / discharge command value Po_2, output fluctuation in a cycle longer than that in the power storage system 1_1 is suppressed.

  FIG. 9F shows a waveform of the charge / discharge command value Po_3 determined by the output sharing control unit 30_3 which is the third control unit. As previously described with reference to FIG. 7, the output sharing control unit 30_3 of the final stage does not perform processing such as derivation of a Bollinger band, and the charge / discharge command value Po_2 determined by the output sharing control unit 30_2 of the preceding stage and the output The charge / discharge residual Pe_3 obtained from the difference between the charge / discharge residual Pe_2 input to the sharing control unit 30_2 is corrected or limited by the charged amount correction unit 33_3 or the output restriction unit 34_3 as necessary, and charged. The discharge command value Po_3 is determined. The charge / discharge command value Po_3 suppresses output fluctuations in a cycle longer than the power storage system 1_2 (the longest cycle).

  9A to 9F exemplify a case in which the power storage system 1 is configured with three units. However, even when the number of power storage systems 1 is four or more, the charge / discharge command value Po_n for each power storage system 1 is similarly calculated. Is possible.

  As described above, according to the present embodiment, in order to stabilize the fluctuation of the power system, the power storage system 1 is configured by a plurality of units, and the output fluctuation suppression of a different cycle is assigned to each power storage system 1. In this case, the output fluctuations in a short cycle are suppressed in order. The charge / discharge command value Po_n of the n-th unit is obtained from the first unit to the N-th unit based on the waveform smoothed by suppressing the output fluctuation in order from the one with the shorter cycle. When the command values to be transmitted to the power conversion devices 3 of the respective power storage systems 1 are obtained in this manner, the command values are charged or discharged among all the power storage systems 1. Therefore, charging / discharging between the plurality of power storage systems 1 does not occur, and loss due to charging / discharging between the power storage systems 1 is reduced.

  The present invention is not limited to the above-described embodiments as they are, and can be embodied by modifying the constituent elements without departing from the gist of the embodiment. Various inventions can be formed by appropriately combining a plurality of components disclosed in the above embodiments. For example, all the components shown in the embodiments may be appropriately combined. Further, components of different embodiments may be appropriately combined. It goes without saying that various modifications and applications are possible without departing from the spirit of the invention.

REFERENCE SIGNS LIST 1 power storage system 2 power storage device 3 power conversion device 4 transformer for interconnection 6 natural fluctuation power supply 10 controller

Claims (17)

When a power storage system having a power storage device and a power conversion device is composed of N (N is an integer of 3 or more) units and the power system is stabilized, control for controlling charging and discharging of the power storage device is performed. A device,
A charge / discharge command value calculation unit that calculates a power storage site charge / discharge command value, which is a charge / discharge command value for the entire N power storage systems, for stabilizing the power system,
A first control unit that controls the first power storage system by transmitting a first charge / discharge command value to the first power storage system that performs charge / discharge in the longest cycle;
Transmitting a k-th charge / discharge command value to a k-th power storage system that performs charging / discharging at a shorter cycle than the (k-1) -th power storage system (k is an integer of 2 or more and less than N); A k-th control unit that controls the power storage system of
An N-th control unit that controls the N-th power storage system;
Wherein the first control unit of the N control units includes:
Based on the envelope of said upper and lower seeking upper and lower envelopes of said electric power storage site discharge command value, first extracting the component of the longest period from the power storage site discharge command value A first determination unit that determines a first charge / discharge command value for the first power storage system based on the first waveform.
And the k-th control unit includes:
The power storage site charge / discharge command value or the (k-1) th charge / discharge residual, which is an input value to the (k-1) th determination unit, and the (k-1) th determination unit have determined. A k-th calculation unit that calculates a k-th charge / discharge residual from the (k−1) th charge / discharge command value;
The upper and lower envelopes of the k-th charge / discharge residual are determined, and based on the upper and lower envelopes of the k-th charge / discharge residual, the (k−1) -th determination unit determines A k-th waveform from which a short-period component is extracted from the determined (k-1) -th charge / discharge command value is obtained, and a k-th charge / discharge for the k-th power storage system is performed based on the k-th waveform. A k-th determining unit for determining a command value;
And the N-th control unit includes:
The Nth charging / discharging residual, which is an input value to the (N-1) th determining unit, and the (N-1) th charging / discharging command value determined by the (N-1) th determining unit, the Nth charging / discharging command value. An N-th calculation unit for calculating a discharge residual;
An N-th determination unit that determines an N-th waveform from the N-th charge / discharge residual, and determines an N-th charge / discharge command value for the N-th power storage system based on the N-th waveform;
A control device comprising: When a power storage system having a power storage device and a power conversion device is composed of N (N is an integer of 3 or more) units and the power system is stabilized, control for controlling charging and discharging of the power storage device is performed. A device,
A charge / discharge command value calculation unit that calculates a power storage site charge / discharge command value, which is a charge / discharge command value for the entire N power storage systems, for stabilizing the power system,
A first control unit that controls the first power storage system by transmitting a first charge / discharge command value to a first power storage system that performs charge / discharge in the shortest cycle;
Transmitting a k-th charge / discharge command value to a k-th power storage system that performs charging / discharging at a longer cycle than the (k-1) -th power storage system (k is an integer less than or equal to 2 and less than N); A k-th control unit that controls the power storage system of
An N-th control unit that controls the N-th power storage system;
Wherein the first control unit of the N control units includes:
Based on the envelope of said upper and lower seeking upper and lower envelopes of said electric power storage site discharge command value, first extracting the component of the shortest period from the power storage site discharge command value A first determination unit that determines a first charge / discharge command value for the first power storage system based on the first waveform.
And the k-th control unit includes:
The power storage site charge / discharge command value or the (k-1) th charge / discharge residual, which is an input value to the (k-1) th determination unit, and the (k-1) th determination unit have determined. A k-th calculation unit that calculates a k-th charge / discharge residual from the (k−1) th charge / discharge command value;
The upper and lower envelopes of the k-th charge / discharge residual are determined, and based on the upper and lower envelopes of the k-th charge / discharge residual, the (k−1) -th determination unit determines A k-th waveform obtained by extracting a long-period component from the determined (k-1) -th charge / discharge command value is obtained, and a k-th charge / discharge for the k-th power storage system is performed based on the k-th waveform. A k-th determining unit for determining a command value;
And the N-th control unit includes:
The Nth charging / discharging residual, which is the input value to the (N-1) th determining unit, and the (N-1) th charging / discharging command value determined by the (N-1) th determining unit, the Nth charging / discharging command value. An N-th calculation unit for calculating a discharge residual;
An N-th determination unit that determines an N-th waveform from the N-th charge / discharge residual and determines an N-th charge / discharge command value for the N-th power storage system based on the N-th waveform;
A control device comprising: The first determination unit of the first control unit includes:
A first residual calculation unit that calculates a first difference between the power storage site charge / discharge command value and a signal represented by the first waveform,
Determining the first charge / discharge command value based on the first difference obtained by the first residual calculation unit;
The k-th determining unit of the k-th control unit includes:
A k-th residual calculation unit that calculates a k- th difference between the k-th charge / discharge residual determined by the k-th calculation unit and a signal represented by the k-th waveform,
The control device according to claim 2, wherein the k-th charge / discharge command value is determined based on the k-th difference obtained by the k-th residual calculation unit. The n-th (n is an integer equal to or greater than 1 and less than or equal to N) determining unit corrects the amount of power stored in the n-th power storage system with respect to the n-th charge / discharge command value determined by the n-th determining unit. Department control device according to any one of claims 1-3, which is characterized in that the further comprises respectively. An output limiting unit that adds a constraint of the n-th power storage system to the n-th charge / discharge command value set by the n-th (n is an integer of 1 or more and N or less) determining unit. The control device according to any one of claims 1 to 4, characterized in that: The n-th (n is an integer of 1 or more and N or less) determining unit is
A waveform calculation unit that calculates an upper envelope and a lower envelope of a Bollinger band obtained from the charge / discharge command value or the charge / discharge residual for the entire power storage system,
The upper envelope and to determine the sign of the lower envelope Noso respectively, and the upper envelope, the charge and discharge command value of the waveform take one of the lower envelope or zero the n control device according to claim 1, characterized in that it comprises a selection unit for, a. A control device that controls charging and discharging of each of the power storage devices when the power storage system including the power storage device and the power conversion device is configured with two units and stabilizes the power system,
A charge / discharge command value calculation unit that calculates a power storage site charge / discharge command value, which is a charge / discharge command value for the entire two power storage systems, for stabilizing the power system,
A first control unit that controls the first power storage system by transmitting a first charge / discharge command value to a first power storage system that performs short-cycle or long-cycle charge / discharge;
Transmitting a second charge / discharge command value to a second power storage system that performs a long cycle or a short cycle charge / discharge with respect to the short cycle / long cycle charge / discharge by the first power storage system, A second control unit that controls the second power storage system;
And the first control unit comprises:
Based on the envelope of said upper and lower seeking upper and lower envelopes of said electric power storage site discharge command value, to extract the components of the short cycle or long cycle from the power storage site discharge command value A first determination unit that determines a first waveform and determines a first charge / discharge command value for the first power storage system using the first waveform;
And the second control unit comprises:
A second charge / discharge residual is calculated from the power storage site charge / discharge command value, which is an input value to the first determination unit, and the first charge / discharge command value determined by the first determination unit. An operation unit;
A second determination unit that determines a second waveform from the second charge / discharge residual, and determines a second charge / discharge command value for the second power storage system based on the second waveform;
A control device comprising: When the first charge / discharge command value controls a short cycle charge / discharge, and the second charge / discharge command value controls a long cycle charge / discharge, the first control unit controls the first charge / discharge. The decision part is
A first residual calculation unit that calculates a first difference between the power storage site charge / discharge command value and a signal represented by the first waveform,
The control device according to claim 7, wherein the first charge / discharge command value is determined based on the first difference obtained by the first residual calculation unit. When a power storage system having a power storage device and a power conversion device is composed of N (N is an integer of 3 or more) units and the power system is stabilized, control for controlling charging and discharging of the power storage device is performed. A device,
For stabilizing the power system, a receiving unit that receives a power storage site charge / discharge command value that is a charge / discharge command value for the entire N power storage systems from the outside,
A first control unit that controls the first power storage system by transmitting a first charge / discharge command value to the first power storage system that performs charge / discharge in the longest cycle;
Transmitting a k-th charge / discharge command value to a k-th power storage system that performs charging / discharging at a shorter cycle than the (k-1) -th power storage system (k is an integer of 2 or more and less than N); A k-th control unit that controls the power storage system of
An N-th control unit that controls the N-th power storage system;
Wherein the first control unit of the N control units includes:
Based on the envelope of said upper and lower seeking upper and lower envelopes of said electric power storage site discharge command value, first extracting the component of the longest period from the power storage site discharge command value A first determination unit that determines a first charge / discharge command value for the first power storage system based on the first waveform.
And the k-th control unit includes:
The power storage site charge / discharge command value or the (k-1) th charge / discharge residual, which is an input value to the (k-1) th determination unit, and the (k-1) th determination unit have determined. A k-th calculation unit that calculates a k-th charge / discharge residual from the (k−1) th charge / discharge command value;
The upper and lower envelopes of the k-th charge / discharge residual are determined, and based on the upper and lower envelopes of the k-th charge / discharge residual, the (k−1) -th determination unit determines A k-th waveform from which a short-period component is extracted from the determined (k-1) -th charge / discharge command value is obtained, and a k-th charge / discharge for the k-th power storage system is performed based on the k-th waveform. A k-th determining unit for determining a command value;
And the N-th control unit includes:
The Nth charging / discharging residual, which is the input value to the (N-1) th determining unit, and the (N-1) th charging / discharging command value determined by the (N-1) th determining unit, the Nth charging / discharging command value. An N-th calculation unit for calculating a discharge residual;
An N-th determination unit that determines an N-th waveform from the N-th charge / discharge residual and determines an N-th charge / discharge command value for the N-th power storage system based on the N-th waveform;
A control device comprising: When a power storage system having a power storage device and a power conversion device is composed of N (N is an integer of 3 or more) units and the power system is stabilized, control for controlling charging and discharging of the power storage device is performed. A device,
For stabilizing the power system, a receiving unit that receives a power storage site charge / discharge command value that is a charge / discharge command value for the entire N power storage systems from the outside,
A first control unit that controls the first power storage system by transmitting a first charge / discharge command value to a first power storage system that performs charge / discharge in the shortest cycle;
Transmitting a k-th charge / discharge command value to a k-th power storage system that performs charging / discharging at a longer cycle than the (k-1) -th power storage system (k is an integer less than or equal to 2 and less than N); A k-th control unit that controls the power storage system of
An N-th control unit that controls the N-th power storage system;
Wherein the first control unit of the N control units includes:
Based on the envelope of said upper and lower seeking upper and lower envelopes of said electric power storage site discharge command value, first extracting the component of the shortest period from the power storage site discharge command value A first determination unit that determines a first charge / discharge command value for the first power storage system based on the first waveform.
And the k-th control unit includes:
The power storage site charge / discharge command value or the (k-1) th charge / discharge residual, which is an input value to the (k-1) th determination unit, and the (k-1) th determination unit have determined. A k-th calculation unit that calculates a k-th charge / discharge residual from the (k−1) th charge / discharge command value;
Based on the upper and lower envelope of charging and discharging residual of the first k seeking upper and lower envelope of charging and discharging residual of the first k, determining unit of the (k-1) is determined A k-th waveform obtained by extracting a long-period component from the (k-1) th charge / discharge command value obtained is obtained, and a k-th charge / discharge command for the k-th power storage system is obtained based on the k-th waveform. A k-th determining unit for determining a value;
And the N-th control unit includes:
The (N-1) th charge / discharge residual, which is the input value to the (N-1) th determination unit, and the (N-1) th charge / discharge command determined by the (N-1) th determination unit An N-th calculation unit for calculating an N-th charge / discharge residual from the value and
An N-th determination unit that determines an N-th waveform from the N-th charge / discharge residual and determines an N-th charge / discharge command value for the N-th power storage system based on the N-th waveform;
A control device comprising: The first determination unit of the first control unit includes:
A first residual calculation unit that calculates a first difference between the power storage site charge / discharge command value and a signal represented by the first waveform,
Determining the first charge / discharge command value based on the first difference obtained by the first residual calculation unit;
The k-th determining unit of the k-th control unit includes:
A k-th residual calculation unit that calculates a k- th difference between the k-th charge / discharge residual determined by the k-th calculation unit and a signal represented by the k-th waveform,
The control device according to claim 10, wherein the k-th charge / discharge command value is determined based on the k-th difference obtained by the k-th residual calculation unit. A control device that controls charging and discharging of each of the power storage devices when the power storage system including the power storage device and the power conversion device is configured with two units and stabilizes the power system,
For performing stabilization of the power system, a receiving unit that externally receives a power storage site charge / discharge command value that is a charge / discharge command value for the entire two power storage systems,
A first control unit that controls the first power storage system by transmitting a first charge / discharge command value to a first power storage system that performs short-cycle or long-cycle charge / discharge;
Transmitting a second charge / discharge command value to a second power storage system that performs a long cycle or a short cycle charge / discharge with respect to the short cycle / long cycle charge / discharge by the first power storage system, A second control unit that controls the second power storage system;
And the first control unit comprises:
Based on the envelope of said upper and lower seeking upper and lower envelopes of said electric power storage site discharge command value, to extract the components of the short cycle or long cycle from the power storage site discharge command value A first determination unit that determines a first waveform and determines a first charge / discharge command value for the first power storage system using the first waveform;
And the second control unit comprises:
A second charge / discharge residual is calculated from the power storage site charge / discharge command value, which is an input value to the first determination unit, and the first charge / discharge command value determined by the first determination unit. An operation unit;
A second determination unit that determines a second waveform from the second charge / discharge residual, and determines a second charge / discharge command value for the second power storage system based on the second waveform;
A control device comprising: When the first charge / discharge command value controls a short cycle charge / discharge, and the second charge / discharge command value controls a long cycle charge / discharge, the first control unit controls the first charge / discharge. The decision part is
A first residual calculation unit that calculates a first difference between the power storage site charge / discharge command value and a signal represented by the first waveform,
The control device according to claim 12, wherein the first charge / discharge command value is determined based on the first difference obtained by the first residual calculation unit.   A system including the power storage device and the power conversion device, including a power storage system configured with a plurality of units and stabilizing a power system, and a control device according to any one of claims 1 to 13. . A method for controlling a power storage system, comprising a power storage device and a power conversion device, comprising N (N is an integer of 3 or more) units and stabilizing the power system,
Based on the envelope of said upper and lower seeking upper and lower envelope of the electric power storage site discharge command value is a command value of the charging and discharging of the total N number of electric power storage system, the electric power storage site A first waveform obtained by extracting a component of the longest cycle from the charge / discharge command value is obtained, and a first charge / discharge command for a first power storage system that performs a longest cycle charge / discharge based on the first waveform. Determine the value,
The (k−1) th (k is an integer of 2 or more and less than N) charge / discharge command value used in determining the power storage site charge / discharge command value or the (k−1) th charge / discharge residual error; The k-th charge / discharge residual is calculated from the charge / discharge command value of (k-1),
The upper and lower envelopes of the k-th charge / discharge residual are obtained, and the (k−1) th charge / discharge command is determined based on the upper and lower envelopes of the k-th charge / discharge residual. A k-th waveform obtained by extracting a component having a shorter cycle than the value, and based on the k-th waveform, a k-th power storage system that performs charging and discharging in a cycle shorter than that of the (k-1) -th power storage system Determine the k-th charge / discharge command value for
The (N-1) th charge / discharge residual used in determining the (N-1) th charge / discharge command value and the Nth charge / discharge residual from the (N-1) th charge / discharge command value. , And
An Nth waveform is obtained from the Nth charge / discharge residual, and an Nth charge / discharge command value for the Nth power storage system is determined based on the Nth waveform. How to control. A method for controlling a power storage system, comprising a power storage device and a power conversion device, comprising N (N is an integer of 3 or more) units and stabilizing the power system,
Based on the envelope of said upper and lower seeking upper and lower envelope of the electric power storage site discharge command value is a command value of the charging and discharging of the total N number of electric power storage system, the electric power storage site A first waveform obtained by extracting the shortest cycle component from the charge / discharge command value is obtained, and a first charge / discharge command for the first power storage system performing the shortest cycle charge / discharge based on the first waveform. Determine the value,
The (k−1) th (k is an integer of 2 or more and less than N) charge / discharge command value used in determining the power storage site charge / discharge command value or the (k−1) th charge / discharge residual error; The k-th charge / discharge residual is calculated from the charge / discharge command value of (k-1),
The upper and lower envelopes of the k-th charge / discharge residual are obtained, and the (k−1) th charge / discharge command is determined based on the upper and lower envelopes of the k-th charge / discharge residual. A k-th waveform obtained by extracting a component having a longer period from the value, and a k-th power storage system that performs charging and discharging at a longer cycle than the (k-1) -th power storage system based on the k-th waveform. Determine the k-th charge / discharge command value for
The (N-1) th charge / discharge residual used in determining the (N-1) th charge / discharge command value and the Nth charge / discharge residual from the (N-1) th charge / discharge command value. , And
An Nth waveform is obtained from the Nth charge / discharge residual, and an Nth charge / discharge command value for the Nth power storage system is determined based on the Nth waveform. How to control. In the process of determining the first charge / discharge command value,
Calculating a first difference between the power storage site charge / discharge command value and a signal represented by the first waveform;
Determining the first charge / discharge command value based on the first difference;
In the process of determining the k-th charge / discharge command value,
Calculating a k- th difference between the k-th charge / discharge residual and a signal represented by the k-th waveform;
The method for controlling a power storage system according to claim 16, wherein the k-th charge / discharge command value is determined based on the k-th difference.