JP2015177628A - Power storage control method, control device and power storage control system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a control device for controlling charge/discharge of a storage battery with which power can be suppressed from exceeding peak contract power of a power system even during execution of charge/discharge control for frequency control.SOLUTION: A storage battery control method for controlling charge/discharge of a power storage system 5 comprises a frequency detection step for detecting a system frequency, a high-pass extraction step of specifying the frequency variation of variation components of a system frequency, cutting variation components in a frequency region lower than a first frequency from the system frequency, and outputting a first differential frequency containing variation components in a frequency region higher than the first frequency, an instruction value generating step of generating a control instruction value for suppressing variation of the system frequency by using the first differential frequency, and a charge/discharge step of performing frequency control for suppressing the variation of the system frequency by using the control instruction value. In the high-pass extraction step, the first frequency is higher than the reciprocal number of a unit time for calculating average power consumption to be compared with the predetermined contract power.

Description

  The present invention relates to a control device that controls charging / discharging of a storage battery.

  In recent years, a collective power receiving service has been provided in commercial facilities and apartment houses as one of the power contracts. The collective power receiving service is a service for reducing an electricity bill by purchasing electricity of a consumer who consists of one or more households.

  In this collective power receiving service, a predetermined contract power (peak contract power) indicating a standard of average power consumption per unit time is determined in advance between the customer and the service provider. When the average power consumption per unit time of the consumer exceeds the contract power, the basic charge for using the power of the consumer is high. For this reason, it is desirable to control so that the peak of the average power consumption of the consumer per unit time does not exceed a predetermined contract power.

  2. Description of the Related Art Conventionally, there is known a technique for suppressing a peak of power consumption of a consumer by connecting a storage battery to a power load that consumes power, discharging the storage battery, and supplying power to the power load.

  For example, in Patent Document 1, a control device that controls charging / discharging of a storage battery charges the storage battery at night, and discharges the storage battery during the daytime when the power consumption is large. Is suppressed. Thus, a method for reducing the power cost by controlling the predetermined contract power based on the power contract by controlling charging and discharging of the storage battery is disclosed.

  Patent Document 2 discloses a frequency control device that uses charging / discharging of a secondary battery in order to suppress frequency fluctuations in the power system.

  A service in which a secondary battery is connected to an electric power system as in Patent Document 2 to suppress power voltage and frequency fluctuation is called an ancillary service. In particular, a service that suppresses system frequency fluctuation is called a frequency control frequency regulation (hereinafter abbreviated as “FR”) service.

  Frequency control (FR control) in an FR service using a storage battery performs control to charge when the system frequency is higher than the average reference frequency and to discharge when the system frequency is lower. is there.

JP 2008-306832 A JP 2001-37085 A

  However, in the techniques of Patent Documents 1 and 2, when charge / discharge control for frequency control is being performed on the storage battery, the predetermined contract power determined between the service provider and the customer is exceeded. There is.

  Therefore, in view of the above, the present invention is a storage battery control method for controlling charge / discharge of a storage battery, which can reduce exceeding a predetermined contract power even during charge / discharge control for frequency control. The purpose is to provide.

  To achieve the above object, a storage battery control method according to an aspect of the present invention is a storage battery control method for controlling charging / discharging of a power storage system connected to a power system and a power load, and the frequency of the power system A frequency detection step for detecting a certain system frequency, and specifying a frequency change of the fluctuation component of the system frequency, and cutting the fluctuation component of the system frequency corresponding to a frequency region lower than the first frequency from the system frequency A high-frequency extraction step for outputting a first differential frequency including a fluctuation component of the system frequency in a frequency region higher than the first frequency, and using the first differential frequency, A command value generation step for generating a control command value for controlling charge / discharge power of the power storage system, and the system using the control command value A charge / discharge step of performing frequency control for controlling charge / discharge of the power storage system so as to suppress fluctuations in the wave number, wherein the first frequency is compared with predetermined contract power in the high-frequency extraction step Average power consumption, which is higher than the reciprocal of unit time for calculating average power consumption, which is an average value of power supplied from the power system to the power load and the power storage system.

  These general or specific aspects may be realized by a system, a method, an integrated circuit, a computer program, or a recording medium such as a computer-readable CD-ROM. The system, method, integrated circuit, computer program And any combination of recording media.

  According to the storage battery control method of the present invention, it is possible to reduce exceeding predetermined contract power even during charge / discharge control for frequency control.

It is a block diagram of the storage battery control system of Embodiment 1. It is a graph which shows an example of a time change of system frequency deviation. 3 is a graph of frequency variation components according to the first embodiment. It is a figure which shows the time change of power consumption at the time of performing the frequency control using the result which cut the low frequency component by the high-pass filter part. It is a figure which shows the time change of power consumption when not using a high-pass filter part. 3 is a flowchart showing the operation of the storage battery control system according to Embodiment 1. It is a block diagram of the storage battery control system of Embodiment 2. FIG. 6 is a configuration diagram of a storage battery control system according to a third embodiment. It is a block diagram of the storage battery control system of Embodiment 4. It is a figure for demonstrating the case where an amplification factor is set to the variable filter which functions as a high-pass filter. It is a figure for demonstrating the case where an amplification factor is set to the variable filter which functions as a band pass filter. It is a figure for demonstrating the production | generation method of the output signal of a charging / discharging control part, ie, the charging / discharging control signal of a storage battery. It is a graph which shows the frequency component of a charge signal. It is a graph which shows the frequency component of a peak suppression signal. It is a figure which shows the example of allocation of the maximum value of the charging / discharging current which concerns on each of frequency control and peak suppression control in the case of performing frequency control and peak suppression control in the same time slot | zone. FIG. 10 is a configuration diagram of a storage battery control system according to a seventh embodiment.

(Knowledge that became the basis of the present invention)
The present inventor has found that the following problems occur with respect to the control device described in the “Background Art” column.

  In the system that suppresses the power peak consumed in the power system by the peak shaving control using the technology of Patent Document 1, especially when one storage battery is shared by multiple households, the power capacity of the storage battery that can be used per household Becomes lower. For this reason, for example, it becomes difficult to suppress the daytime power consumption peak with only one storage battery. Therefore, in order to prevent the power consumption peak from exceeding the predetermined contract power, it is necessary to set the predetermined contract power higher and to reduce the time zone exceeding the predetermined contract power as much as possible.

  However, in this case, the storage battery is used only for a short time of the day, and the storage battery cannot be effectively used.

  Therefore, profit (income) is provided by providing an ancillary service used for suppressing frequency fluctuations of the power system described in Patent Document 2, for example, in a part of the time zone when the storage battery is not used. Therefore, the storage battery can be effectively used.

  However, during charge / discharge control for frequency control, the total power consumption is the sum of the power consumption due to the power load of multiple households and the power consumption due to frequency control. That is, if power is further consumed by frequency control in addition to power consumption by the power load, there is a possibility that predetermined contracted power will be exceeded by performing frequency control. The system frequency fluctuation is caused not only by the power consumption by the consumer but also by the power generation amount of the power company, and is generally difficult to predict. For this reason, it is difficult to predict the power required for charge / discharge control related to frequency control.

  In order to solve such a problem, a storage battery control method according to an aspect of the present invention is a storage battery control method for controlling charging / discharging of a power storage system connected to a power system and a power load. A frequency detection step for detecting a system frequency, which is a frequency, and a frequency change of a fluctuation component of the system frequency is specified, and the fluctuation component of the system frequency corresponding to a frequency region lower than the first frequency is cut from the system frequency. In order to suppress fluctuations in the system frequency using the high-frequency extraction step of outputting a first differential frequency including a fluctuation component of the system frequency in a frequency region higher than the first frequency, and the first differential frequency A command value generation step for generating a control command value for controlling the charge / discharge power of the power storage system, and the control command value A charge / discharge step for performing frequency control for controlling charge / discharge of the power storage system so as to suppress fluctuations in system frequency, and in the high-frequency extraction step, the first frequency is compared with predetermined contract power. The average power consumption is higher than the reciprocal of unit time for calculating the average power consumption, which is an average value of power supplied from the power system to the power load and the power storage system.

  According to this, the first differential frequency including the fluctuation component of the system frequency in the frequency region higher than the first frequency obtained by cutting the fluctuation component of the system frequency corresponding to the frequency region lower than the first frequency from the system frequency Accordingly, a control command value for performing frequency control is generated. For this reason, the control command value generated by the FR signal generation unit is obtained by cutting a frequency component lower than the first frequency, which is a frequency higher than the reciprocal of unit time for calculating the average power consumption. Based on the first differential frequency including the fluctuation component of the system frequency in the frequency region higher than the first frequency. Since the frequency control is performed based on the control command value, the frequency control without considering the fluctuation component of the unit time order for calculating the average power consumption compared with the predetermined contract power is performed. That is, since the low frequency component of the unit time order is removed in the time zone in which the frequency control is performed, the frequency control can be performed so that the average power consumption does not exceed the predetermined contract power.

  In addition, when the average power consumption exceeds the predetermined contract power, a power charge of a consumer who manages the power storage system may increase.

  In the charging / discharging step, peak suppression control for controlling charging / discharging of the power storage system may be further performed so that the average power consumption is equal to or less than the predetermined contract power.

  In the charge / discharge step, the frequency control and the peak suppression control may be performed in different time zones.

  Further, the method further includes a prediction step of predicting a peak time zone in which the average power consumption exceeds the predetermined contract power, and in the charge / discharge step, the peak suppression control is performed in the peak time zone, and the peak time The frequency control may be performed in at least a part of a time zone that is not a time zone.

  Furthermore, from a frequency variation based on a time variation of power supplied from the power system to the power load and the power storage system, a variation component in a frequency region higher than a second frequency that is a frequency higher than the first frequency. A low-frequency extraction step for outputting a differential frequency variation including a variation component corresponding to a frequency region lower than the second frequency by cutting, and in the prediction step, the low-frequency extraction step outputs the The peak time zone may be predicted using the difference frequency variation.

  The method further includes an amplifying step for amplifying or attenuating the frequency control signal including the control command value generated in the command value generating step, and the gain in the amplifying step is decreased as the first frequency is decreased. May be.

  In the high frequency extraction step, the first frequency may be variable.

  Further, the method includes an instruction generation step of receiving a remote instruction via a network and generating a change instruction for changing the first frequency to an instruction frequency indicated by the remote instruction. The first frequency may be changed to the indicated frequency in accordance with the change instruction.

  Further, in the charge / discharge step, a time period from a time before a first predetermined time to a start time before a start time of a time zone in which the peak suppression control is performed, and the system frequency is a reference frequency of the system frequency If higher, a charge signal obtained by adding a charge signal component to a frequency control signal including the control command value may be generated, and the frequency control may be performed based on the charge signal.

  The charging signal component may be proportional to a low frequency component lower than the reciprocal of the unit time among the fluctuation components of the system frequency.

  In the charge / discharge step, the peak suppression control and the frequency control are performed in the same time zone, and the maximum frequency of the fluctuation component of the charge / discharge signal in the peak suppression control may be lower than the first frequency. .

  Furthermore, the method further includes a measurement step of measuring the control command value, and in the measurement step, the time change of the output power of the power storage system is detected, and the time change of the detected output power is stored in a storage unit, You may receive the result of the time change of the said output electric power memorize | stored in the said memory | storage part, and may transmit to an external apparatus using a communication network.

  In the measurement step, a fluctuation component in a frequency region lower than the third frequency that is equal to or lower than the first frequency and equal to or higher than the second frequency is calculated from the frequency fluctuation based on the time change of the detected output power. A second differential frequency including a fluctuation component corresponding to a frequency region higher than the third frequency may be output by cutting, and the second differential frequency may be stored in the storage unit.

  These general or specific aspects may be realized by a recording medium recording medium such as an apparatus, a system, an integrated circuit, a computer program, or a computer-readable CD-ROM, and the system, method, integrated circuit, You may implement | achieve with arbitrary combinations of a computer program or a recording medium.

  Hereinafter, a control device and a storage battery control system according to one embodiment of the present invention will be specifically described with reference to the drawings.

  Note that each of the embodiments described below shows a specific example of the present invention. The numerical values, shapes, materials, constituent elements, arrangement positions and connecting forms of the constituent elements, steps, order of steps, and the like shown in the following embodiments are merely examples and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

<Embodiment 1>
The storage battery control system according to the present embodiment uses a power storage system connected in parallel to an electric power load connected to the electric power system to suppress fluctuations in the system frequency of the electric power system and to provide auxiliary power to the electric power load. Supply.

  The first embodiment will be described below.

  FIG. 1 is a configuration diagram of a storage battery control system according to the first embodiment.

  The storage battery control system 1 includes a power load 4 connected to the power system 2, a power storage system 5 connected in parallel to the power load 4, a control device 6, and a power detection unit 3.

  The power load 4 indicates the total power load in one or more households, an apartment, a condominium, a hotel, or the like composed of one or more rooms. However, the power load 4 is not limited to the total power load described above, and may be another power load.

  The power storage system 5 includes at least a chargeable / dischargeable secondary battery and a power conditioner (not shown). This power conditioner includes a DC / DC converter or a DC / AC inverter, and converts electric power into desired power among the electric power system 2, the electric power load 4, and the secondary battery.

  The control device 6 controls charging / discharging of the power storage system 5.

  The power detection unit 3 measures a temporal change in the total power that is the total power consumed by the power load 4 and the power storage system 5. That is, the power detection unit 3 measures the power (total power) supplied from the power system 2 to the power load 4 and the power storage system 5, and identifies the time change of the power from the measured result.

  In addition, if the electric power detection part 3 is arrange | positioned between the electric power grid | system 2, and the electric power load 4 and the electrical storage system 5, as shown in FIG. 1, the total electric power of the electric power load 4 and the electrical storage system 5 will be measured. However, this form may not be adopted for the detection of the total power. That is, in order to measure the total power consumed by the power load 4 and the power storage system 5, two detection units for detecting the respective powers of the power load 4 and the power storage system 5 are provided and detected by the two detection units. You may measure the sum total of the electric power performed as total electric power.

  Here, the electric energy usually means an integrated value of electric power in a predetermined time and corresponds to energy. Here, the amount of power may be referred to as power amount. Moreover, electric power (power) and electric energy (energy) correspond to each other. Therefore, here, electric power may be used in the meaning of electric energy (energy), and electric energy may be used in the meaning of electric power (power). Moreover, electric power and electric energy may mean those values.

  The owner or manager of the power load 4 and the power storage system 5 purchases power from the power supplier of the power system based on the total power detected by the power detection unit 3.

  In general, the electricity bill is basically calculated based on the total power consumption (kWh). Here, when a predetermined contracted power (hereinafter referred to as “peak contracted power”) of the total power is contracted in advance (collective power receiving contract), the rate of electricity rate (yen / kWh) according to the value of the peak contracted power ) Will change. The smaller the value of the peak contract power, the lower the rate of electricity charges. Therefore, the electricity charges can be purchased cheaply by reducing the peak contract power. That is, when the average power consumption exceeds the peak contract power, the power charge for the consumer who manages the power storage system increases.

  This peak contract power is defined from the power average time T1. Here, the power average time T1 is average power consumption compared with the peak contract power, and is a unit time for calculating the average power consumption of the total power. That is, when the total power detected by the power detection unit 3 is averaged by the power average time T1, it is necessary that this average power consumption does not exceed the peak contract power. The power average time is usually a time in a range of 30 minutes to 60 minutes, for example, but may be a time other than this.

  The control device 6 includes a charge / discharge control unit 7, a peak prediction unit 8, a frequency detection unit 9, a high-pass filter unit 10, and an FR signal generation unit 11.

  The frequency detection unit 9 detects a system frequency that is a frequency of the power system 2. Specifically, the frequency detection unit 9 detects a temporal change in the system frequency (= f (Hz)) of the power system 2. Although the frequency detection unit 9 detects the system frequency from between the power detection unit 3 and the power storage system 5, it may be detected from any location as long as the system frequency can be measured.

  The high-pass filter unit 10 performs a predetermined cut out of the system frequency deviation (Δf (t) = f−f0), that is, the time change Δf (t) of the value obtained by subtracting the reference frequency (= f0) from the system frequency. A low frequency fluctuation component lower than the frequency (= F (Hz)) is cut. Here, it is assumed that the frequency deviation obtained by cutting the low frequency component is Δfh (t). That is, the high-pass filter unit 10 identifies the frequency change of the fluctuation component of the system frequency and cuts the fluctuation component of the system frequency corresponding to the frequency region lower than the first frequency (cut frequency F) from the system frequency. A first differential frequency including a fluctuation component of the system frequency in a frequency region higher than one frequency is output. Here, the reference frequency f0 is an average frequency of the system frequency. For example, in the Kanto / Tohoku area in Japan, f0 = 50 Hz.

  The FR signal generation unit 11 generates and outputs an FR signal FR (t) for controlling the frequency of the power storage system 5 from the output signal of the high-pass filter unit 10. That is, the FR signal generation unit 11 uses the first differential frequency output by the high-pass filter unit 10 to control the charge / discharge power of the power storage system 5 in order to suppress fluctuations in the system frequency. The FR signal FR (t) is generated. At this time, the FR signal is expressed as (Equation 1).

  FR (t) = − a · Δfh (t) (a is a positive constant) (Equation 1)

  The FR signal FR (t) indicates discharge power when positive and charge power when negative. That is, when frequency control is performed by the FR signal FR (t), the power storage system 5 is charged when the system frequency f is higher than the reference frequency f0, and is discharged when it is low.

  FIG. 2 is a graph showing an example of a time change of the system frequency deviation. Specifically, (1) of FIG. 2 is an example of a time change of the conventional system frequency deviation Δf (t) when the high-pass filter unit 10 is not provided. (2) of FIG. 2 shows an example of a time change of the system frequency deviation Δfh (t) of the present invention when the high-pass filter unit 10 is present. In addition, a dotted line is a value when it averages by electric power average time T1.

  The charge / discharge control unit 7 performs frequency control using the signal FR (t) generated by the FR signal generation unit.

  FIG. 3 shows a graph of frequency components of each signal and a method for setting the cut frequency F of the high-pass filter section.

  The dotted curve in FIG. 3 is an example of the frequency dependence of the frequency fluctuation component with respect to the time variation (Δf (t) = f−f0) of the system frequency deviation, and the solid curve cuts the low frequency component at the cut frequency F. An example of the frequency dependence at this time is shown.

  As shown in FIG. 3, the cut frequency F as the first frequency is a reciprocal of the power average time T1, that is, a value higher than 1 / T1. When the power average time T1 is, for example, 30 to 60 minutes, 1 / T1 is 2.8 × 10 ^ (− 4) to 5.6 × 10 ^ (− 4) (Hz).

  Next, an example of a frequency cut calculation method will be described. The solid line in (1) of FIG. 2 is the system frequency deviation Δf = f−f0, and the dotted line is the average of Δf at time 1 / F (= Δf1).

  For example, Δf1 is calculated as follows.

  When Δt is the time interval of the total power data acquired by the power detection unit 3 and t (n) = Δt × n (n = 1, 2, 3,...), T = t (n + 1) Δf1 (t (n + 1)) at is obtained by the following (Equation 2) using Δf1 (t (n)) and Δf (t (n + 1)).

  Δf1 (t (n + 1)) = Δf1 (t (n)) · (N−1) / N + Δf (t (n + 1)) / N (Expression 2)

  Here, 1 / F is (Equation 3).

  1 / F = Δt · N (Expression 3)

  (Equation 2) and (Equation 3) obtain Δf1 (t) obtained by averaging the high frequency components, and further subtract Δf1 (t) from Δf (t) to obtain a signal (Δfh (t )) Is obtained.

  That is, Δfh (t) is obtained as in (Equation 4).

  Δfh (t) = Δf (t) −Δf1 (t) (Expression 4)

  As shown in (2) of FIG. 2, Δfh (t) is a graph from which low-frequency fluctuation components on the order of time 1 / F are removed.

  Instead of the above calculation method, other calculation methods may be used, and the frequency of the analog output signal of the power detection unit 3 may be cut using a hardware low-pass filter. .

  The charge / discharge control unit 7 charges and discharges the power storage system 5 and performs frequency control of the power system. The charge / discharge control unit 7 controls charging or discharging of the power storage system 5 using the FR signal generated by the FR signal generation unit 11 so as to suppress the frequency fluctuation of the power system 2.

  Moreover, the charge / discharge control part 7 can perform peak suppression control in addition to frequency control. The peak suppression control is control for suppressing the average power consumption of the consumer by discharging the power storage system 5. Thereby, it can be expected that the average power consumption of the consumer is made smaller than the peak contract power. In addition, although the charge / discharge control part 7 performs frequency control, it does not necessarily need to perform peak suppression control.

  That is, the peak of power consumption supplied from the power system can be suppressed by the peak suppression control.

  In the first embodiment, the charge / discharge control unit 7 separately performs peak suppression control and frequency control in different time zones. There is also a method of performing peak suppression control and frequency control at the same time. This method will be described in another embodiment described later.

  The charging / discharging control unit 7 performs different peak time control and frequency control of the power storage system 5 based on the peak time zone predicted by the peak prediction unit 8 and the FR signal generated by the FR signal generation unit 11. Divided into two. In other words, the charge / discharge control unit 7 controls the power storage system 5 to operate in the peak suppression control in the peak time zone predicted by the peak prediction unit 8 when the peak power is exceeded, or all of the other time zones or A part controls the power storage system 5 by frequency control based on the FR signal from the FR signal generation unit 11. That is, the charge / discharge control unit 7 performs peak suppression control in the peak time zone, and performs frequency control in at least a part of the time zone that is not the peak time zone.

  Next, peak prediction control of the charge / discharge control unit 7 will be described.

  The peak prediction unit 8 predicts a peak time period in which the average power consumption exceeds the peak contract power.

  The peak prediction unit 8 is a time change trend from the past to the present of the total power P (t) of the power load 4 and the power storage system 5 detected by the power detection unit 3 and environmental factors (such as temperature forecast and weather forecast). ) To predict power consumption P ′ (tf) at a future time tf (> t), and determine a peak time zone that is a time zone in which peak suppression control is necessary. That is, the peak prediction unit 8 predicts a peak predicted value and a peak time zone that are predicted values of the peak of the total power. Although a detailed peak time zone prediction method is not described here, any prediction method may be used.

  The peak prediction unit 8 predicts a time zone tx where P ′ (t)> Pp, where Pp is the peak contract power at the time of the power contract, and charge / discharge control the time zone (tx) information, peak prediction value, and the like. Send to part 7.

  In addition, when the charging / discharging control unit 7 knows in advance a time zone or a predicted value in which the total power P (t) detected by the power detection unit 3 is likely to exceed the peak contract power Pp based on some information, the peak The prediction unit 8 may be omitted.

  However, since the peak prediction unit 8 can accurately predict the peak time zone, the time zone during which the peak suppression control is performed is reduced even when the peak suppression control is unnecessary, and the time allocated to the frequency control is reduced. Since the number of bands increases, income from frequency control increases.

  The charge / discharge control unit 7 stores the output result (peak time zone (tx) information, peak predicted value, etc.) of the peak prediction unit 8. Based on the stored output result, the charge / discharge control unit 7 does not exceed the peak contract power Pp in all or part of the peak time zone (tx) of the total power of the power load 4 and the power storage system 5. Then, a predetermined amount of power is discharged from the power storage system 5.

  For example, the discharge power discharged from the power storage system 5 in the peak suppression control is a value obtained by subtracting the peak contract power from the peak predicted value predicted by the peak prediction unit 8.

  In the peak suppression control, a predetermined amount of discharge power (that is, discharge current) to be discharged to the power storage system 5 may be constant, or may be a value that varies according to fluctuations in the peak predicted value or the like.

  The time zone for peak suppression control or frequency control may be a slot time defined at regular intervals (for example, 1 hour) as a unit time or an irregular time zone. That is, the peak suppression control time zone for performing peak suppression control (hereinafter referred to as “PS time zone”) may be a time zone based on the peak time zone predicted by the peak prediction unit 8.

  FIG. 4 is a diagram illustrating a temporal change in power consumption when frequency control is performed using the result of cutting low frequency components by the high-pass filter unit.

  More specifically, (1) in FIG. 4 is a graph showing a time change between the power consumption PL (dotted line) by the power load 4 and the charge / discharge power PF (solid line) of the power storage system 5 related to frequency control. . Moreover, (2) of FIG. 4 is a graph which shows the time change of total electric power PT (= PL + PF) at the time of performing peak suppression control and frequency control in mutually different time zones.

  The time zone from time t1 to time t2 in FIG. 4 is a time zone (FR time zone) in which frequency control is performed.

  The solid line graph in the FR time zone from time t1 to time t2 in (2) of FIG. 4 shows the total power PT (= PL + PF), which is the sum of the power consumption PL and the charge / discharge power PF, and the bold line graph is It is a graph when averaged by electric power average time T1.

  The charge / discharge power PF by frequency control added to the power consumption PL has a fluctuation component in the order of the power average time T1 removed. That is, in the FR time zone in which the total power PT is predicted not to exceed the peak by the peak prediction unit 8, the cut frequency higher than 1 / T1 that is the reciprocal of the power average time T1 among the fluctuation frequency components of the system frequency. Low frequency components lower than F are cut. For this reason, the FR signal for performing frequency control, which is generated by the FR signal generation unit 11, has a variation corresponding to a frequency region higher than the cut frequency F cut from a variation component corresponding to a frequency region lower than the cut frequency F. Based on the first differential frequency composed of containing components. Since the frequency control is performed based on the FR signal, the frequency control is performed without considering the fluctuation component of the power average time T1 order calculated as the average power consumption compared with the peak contract power. That is, since the low frequency component of the power average time T1 order is removed in the FR time zone that is predicted not to exceed the peak, the total power (thick dotted line) averaged at the power average time T1 is the peak contract. Frequency control can be performed so as not to exceed the power Pp.

  Note that there is a time during which the total power PT (solid line) instantaneously exceeds the peak contract power Pp between the time t1 and the time t2, but it is the power average time T1 that is compared with the peak contract power Pp. There is no problem because it is the averaged total power (thick dotted line) and the total power (thick dotted line) does not exceed the peak contract power Pp.

  In the PS time zone, the above-described peak suppression control is performed by the charge / discharge control unit 7. Specifically, the charge / discharge control unit 7 supplies the electric power load 4 with a certain amount of discharge power in the PS time period from time t2 to time t3, and the result is shown in (2) of FIG. As described above, the total power PT (solid line) in the time period from time t2 to time t3 can be controlled so as not to exceed the contract power Pp.

  FIG. 5 is a diagram illustrating a temporal change in power consumption when the high-pass filter unit is not used.

  More specifically, (1) in FIG. 5 shows the power consumption PL (dotted line) by the power load 4 and the charge / discharge power PF ( A solid line). (2) of FIG. 5 is a graph showing the total power PT when the peak suppression control and the frequency control are performed in different time zones when the high-pass filter unit 10 is not present. When the high-pass filter unit 10 is not used, the frequency control is performed based on the frequency fluctuation with the low-frequency fluctuation frequency component remaining, and as shown in (2) of FIG. The sum total power (thick dotted line) may exceed the peak contract power Pp between time t4 and time t2 in the FR time zone.

  In the first embodiment, it is assumed that frequency control and peak suppression control are performed in different time zones, but the same applies when frequency control and peak suppression control are controlled in the same time. Get the effect. That is, since the FR signal contains only a high frequency component larger than 1 / T1, it can be said that the peak power is not exceeded due to the frequency control signal without affecting the peak suppression control.

  Furthermore, not only by making the cut frequency F higher than 1 / T1, but also by making it lower than the reciprocal (1 / T2) of the response time (= T2) of thermal power generation (that is, 1 / T1 <F <1 / T2). The control device 6 can perform frequency control that can contribute to suppression of high-frequency fluctuations that thermal power generation cannot cope with. Here, since the response time of thermal power generation is generally about 5 to 10 minutes, for example, assuming T2 = 10 minutes, 1 / T2 is about 1.67 × 10 ^ (− 3) Hz.

  Next, the flow of peak suppression control and frequency control will be described using the flowchart of FIG.

  FIG. 6 is a flowchart showing the operation of the storage battery control system according to the first embodiment.

  The peak prediction unit 8 predicts the power consumption of the consumer (that is, the power supplied to the power load 4 and the power storage system 5 by the power system 2) (S1).

  Next, the peak prediction unit 8 predicts a future peak time zone from the output value of the power detection unit 3 from the past to the present (= time t) and environmental factors (such as temperature forecast and weather forecast) (S2). . The peak time zone, peak prediction value, etc. predicted by the peak prediction unit 8 are stored in the charge / discharge control unit 7.

  The FR signal generation unit 11 is obtained by cutting the fluctuation component of the system frequency corresponding to the frequency region lower than the first frequency by the high-pass filter unit 10 from the system frequency detected by the frequency detection unit 9. An FR signal (control command value) for frequency control is generated using the first differential frequency including the fluctuation component of the system frequency corresponding to the frequency region higher than the frequency (S3).

  Next, the charge / discharge control unit 7 determines whether or not the current time t is a peak suppression time zone (PS time zone) (S4).

  If charging / discharging control part 7 judges that it is a PS time slot (S4: YES), based on the stored peak prediction value, for example, discharge control (peak control) for discharging power storage system 5 with a constant discharge current will be performed. Implement (S5). After step S5 is performed, the process returns to step S1.

  On the other hand, if the charge / discharge control unit 7 determines that it is not the PS time zone (S4: NO), it determines whether or not the current time t is a frequency control time zone (FR time zone) (S6).

  It should be noted that frequency control is performed at least partly when it is not the peak control time zone. There may be a time zone during which frequency control is not performed.

  When it is determined that the current time t is the FR time zone (S6: YES), the charge / discharge control unit 7 performs frequency control of the power storage system 5 based on the FR signal generated in step S3, and returns to step S1. .

  When determining that the current time t is not the FR time zone (S6: NO), the charge / discharge control unit 7 returns to step S1.

  FIG. 6 is a flow in which peak prediction is always performed in step S1 and generation of an FR signal is performed in step S2. However, when the time period during which peak suppression and frequency control are not performed is known in advance, the peak prediction in step S1 and the FR signal generation in step S2 may be omitted or suspended.

  In addition, in operation | movement of the storage battery control system 1, since it is not necessary to perform peak suppression control, each step shown below should just be included.

  That is, a storage battery control method for controlling charging / discharging of the storage battery control system 1 connected to the power system 2 and the power load 4, a frequency detection step for detecting a system frequency that is a frequency of the power system 2, and a system frequency First, including the fluctuation component of the system frequency in the frequency region higher than the first frequency by identifying the frequency change of the fluctuation component and cutting the fluctuation component of the system frequency corresponding to the frequency region lower than the first frequency from the system frequency A high frequency extraction step for outputting a difference frequency, and a command value generation step for generating a control command value for controlling charge / discharge power of the power storage system 5 in order to suppress fluctuations in the system frequency using the first difference frequency And charging / discharging for performing frequency control for controlling charging / discharging of the power storage system 5 so as to suppress fluctuations in the system frequency using the control command value. Tsu and up, may if it contains. In the high frequency extraction step, the first frequency is an average power consumption that is compared with predetermined contract power, and is an average value that is an average value of the power supplied from the power system 2 to the power load 4 and the power storage system 5. It is higher than the reciprocal of unit time for calculating power consumption.

  Further, in the charge / discharge step, peak suppression control for controlling charge / discharge of the power storage system 5 may be performed so that the average power consumption is equal to or less than a predetermined contract power.

  Further, in the charge / discharge step, frequency control and peak suppression control may be performed in different time zones.

  In addition, the method further includes a prediction step of predicting a peak time zone in which the average power consumption exceeds a predetermined contract power, and in the charge / discharge step, peak suppression control is performed in the peak time zone and Frequency control may be performed in some time zones.

<Embodiment 2>
FIG. 7 shows a configuration diagram of the storage battery control system 1a according to the second embodiment.

  As in the first embodiment, the storage battery control system 1a according to the second embodiment includes a power load 4 connected to the power system 2, a power storage system 5 connected in parallel thereto, a control device 6a, and a power detection unit 3. It consists of.

  The structural difference between the storage battery control system 1a according to Embodiment 2 and the storage battery control system 1a according to Embodiment 2 is that the control device 6 has a low-pass filter between the peak prediction unit 8 and the power detection unit 3. It has the part 12. Since other constituent elements, reference numerals, and the like are not different from those of the first embodiment, detailed description thereof is omitted.

  The low-pass filter unit 12 is a signal Ph obtained by cutting a high frequency component higher than the cut frequency FL among the fluctuation components of the total power P (t) of the power load 4 and the power storage system 5, which is an output signal of the power detection unit 3. (T) is output. That is, the low-pass filter unit 12 cuts the fluctuation component in the frequency region higher than the second frequency (cut frequency FL) from the frequency variation based on the time change of the total power, so that the frequency region is lower than the second frequency. The difference frequency variation including the corresponding variation component is output. Here, the cut frequency FL is lower than the reciprocal 1 / T1 (that is, the cut frequency F1) of the power average time. That is, the second frequency is lower than the first frequency.

  The peak prediction unit 8 predicts the power consumption Ph ′ (tf) at the future time tf from the way of time change of Ph (t) from the past to the present. That is, the peak prediction unit 8 predicts the peak time zone using the differential frequency fluctuation output by the low-pass filter unit 12. Further, the peak prediction unit 8 predicts a peak time zone tx where Ph ′ (t)> Pp, and the peak time zone tx predicted to the charge / discharge control unit 7 when the peak contract power determined by the power contract is Pp. Transmit peak prediction value.

  Since the instantaneous high-frequency peak is canceled by averaging at the power average time T1, it is not necessary to perform peak suppression control. Therefore, by cutting the second frequency fluctuation component (frequency FL or higher) from the frequency fluctuation based on the time change of the total power detected by the power detection unit 3 as described above, the instantaneous power consumption peak of the high frequency is included. Therefore, the peak time zone can be reduced as much as possible, and the FR revenue can be increased by assigning the reduced time zone to the frequency control time zone.

  That is, in the operation of the storage battery control system 1a, in addition to each step in the operation of the storage battery control system 1, further, from the frequency fluctuation based on the time change of the power supplied from the power system 2 to the power load 4 and the power storage system 5 A low frequency range that outputs a differential frequency variation including a variation component corresponding to a frequency region lower than the second frequency by cutting a variation component in a frequency region higher than the second frequency, which is a frequency higher than the first frequency. An extraction step is included, and in the prediction step, the peak time zone is predicted using the difference frequency fluctuation output in the low-frequency extraction step.

<Embodiment 3>
FIG. 8 shows a configuration diagram of a storage battery control system 1b according to the third embodiment.

  The storage battery control system 1b according to the third embodiment further includes an FR signal measuring unit 18 in addition to the configuration of the storage battery control system 1 according to the first embodiment, and the control device 6 according to the first embodiment. The difference is that the control device 6 b includes a variable filter unit 13 instead of the pass filter unit 10. Since other components, reference numerals, and the like are not different from those of the first embodiment, detailed description thereof is omitted.

  The variable filter unit 13 receives the frequency signal that is the output result of the frequency detection unit 9 and outputs the filter processing result to the FR signal generation unit 11. The variable filter unit 13 can switch a part or all of the high-pass filter function, the low-pass filter function, the band-pass filter function, and the function that does nothing (no filtering) described in the first embodiment. . Alternatively, filter band information such as the cut frequency F that characterizes the filter function can be varied.

  Thereby, it becomes possible to select the function according to various situations by switching the function of the variable filter part 13. For example, the filter function can be used off in a time zone in which frequency control by the high-pass filter function is not permitted. Or, for example, the function of the variable filter unit 13 is set to the high-pass filter control only when the total power consumed by the power load 4 and the power storage system 5 is likely to exceed the peak contract power during the frequency control. By performing the frequency control with the FR signal from which the low frequency component is cut, the peak can be suppressed in the frequency control. Or, for example, in order to deal with bidding on a plurality of FR markets with different bidding conditions, a cut frequency can be changed.

  Next, the FR signal measuring unit 18 will be described.

  In general, in the FR market, it is necessary to report the results of frequency control to the manager of the FR market. The FR signal measuring unit 18 is a means for carrying out this report.

  The FR signal measurement unit 18 includes a power detection unit 14, a storage unit 15, and a communication unit 16. The power detection unit 14 is a storage battery power detection unit that detects temporal changes in the output power of the power storage system 5. The power detection unit 14 transmits the detected time change of the output power of the power storage system 5 to the storage unit 15.

  The storage unit 15 stores the time change of the output power detected by the power detection unit 14.

  The communication unit 16 receives the result of the time change of the charge / discharge power stored in the storage unit 15 and transmits the result using, for example, a line of the Internet 17. Thereby, it becomes possible to transmit the frequency control implementation result to the manager of the FR market.

  That is, in the operation of the storage battery control system 1b, in addition to each step in the operation of the storage battery control system 1, it further includes a measurement step of measuring a control command value. In the measurement step, the time change of the output power of the power storage system 5 Is stored in the storage unit 15, the result of the time change in the output power stored in the storage unit 15 is received, and the outside of the Internet 17 is used as a communication network. To the device.

<Embodiment 4>
FIG. 9 shows a configuration diagram of a storage battery control system 1c according to the fourth embodiment.

  The storage battery control system 1c according to the fourth embodiment is such that the FR signal measurement unit 18 is omitted from the configuration of the storage battery control system 1b according to the third embodiment, and the FR signal generation unit of the control device 6 according to the third embodiment. 11 is different from the charging / discharging control unit 7 in that an amplifying unit 19 is added and a remote control unit 20 for remotely controlling the variable filter unit 13 is added. Since other components, reference numerals, and the like are the same as those in the third embodiment, detailed description thereof is omitted.

  As described in the third embodiment, the variable filter unit 13 switches a part or all of a high-pass filter function, a low-pass filter function, a band-pass filter function, and a function that does nothing (no filtering). be able to. Alternatively, filter band information such as the cut frequency F that characterizes the filter function can be varied. That is, the variable filter unit 13 can change the first frequency.

  The remote control device 21 is a device that remotely controls the variable filter unit 13. The remote control device 21 is a device that can be controlled by a power supplier, for example.

  The remote control unit 20 receives a control signal from the remote control device 21 and remotely controls the filter band information of the variable filter unit 13. The remote control device 21 installed remotely transmits filter band information such as the cut frequency F via, for example, the Internet 17 line. After receiving the control signal, the remote control unit 20 transmits a filter band information control signal such as the cut frequency F to the variable filter unit 13. That is, the remote control unit 20 receives a remote instruction via a network such as the Internet 17, generates a change instruction for changing the first frequency to the instruction frequency indicated by the remote instruction, and sends the change instruction to the variable filter unit 13. Output.

  The variable filter unit 13 receives the system frequency detected by the frequency detection unit 9 and the change instruction from the remote control unit 20, outputs the filter processing result to the FR signal generation unit 11, and amplifies the cut frequency F information. 19 output. That is, the variable filter unit 13 changes the first frequency to the designated frequency in accordance with the change instruction in the high frequency extraction step.

  For example, when the variable filter unit 13 operates as a high-pass filter, a low frequency component equal to or lower than the cut frequency F of the output signal of the frequency detection unit 9 is cut. At this time, the cut frequency F of the high-pass filter is variable.

  The cut frequency F is calculated from, for example, (Expression 2) and (Expression 3) as in the first embodiment, and the cut frequency F can be made variable by changing Δt or N in (Expression 3). .

  Note that the above is just an example of a method for changing parameters (filter band information and the like) in the variable filter unit 13, and a hardware variable filter or the like may be used.

  Thus, based on the control signal transmitted by the remote control device 21, the variable filter unit 13 can change the cut frequency F of the high-pass filter, for example. Therefore, the power supplier can freely change the fluctuation component of the control device 6c that executes the frequency control according to the frequency component of the fluctuation of the system frequency.

  For example, when the high frequency component of the frequency component of the fluctuation of the system frequency becomes large in a certain time zone, the variable filter unit 13 is controlled as a high frequency filter having a high cut frequency F during that time zone. Thus, it is possible to carry out suppression specialized for fluctuations in high frequency components.

  Also, when the low-frequency component of the frequency component of the system frequency fluctuation becomes large in a certain time zone, the variable filter unit is controlled as a low-pass filter, specializing in the fluctuation of the low-frequency component Suppression can also be implemented.

  Next, the operation of the amplifying unit 19 will be described.

  The amplifying unit 19 is an FR signal amplifying unit that multiplies the intensity (magnitude) of the output signal (= FR signal) of the FR signal generating unit 11 by A (A> 0). That is, the amplification unit 19 amplifies or attenuates the FR signal generated by the FR signal generation unit 11. That is, the FR signal calculation formula is changed from (Formula 1) to the following (Formula 5).

  FR (t) = − A · a · Δfh (t) (a is a positive constant) (Equation 5)

  When the amplification factor A is 1 or less, the amplifying unit 19 operates as an attenuator instead of an amplifier. Here, even in the case of an attenuating function, it is referred to as an amplifying unit.

  Next, a method for setting the amplification factor A when the variable filter unit 13 is used as a high-pass filter will be described.

  The amplifying unit 19 receives information on the cut frequency F output from the variable filter unit 13 and changes the amplification factor according to the cut frequency F. At this time, the gain A is decreased as the cut frequency F is decreased.

  FIG. 10 is a diagram for describing a case where an amplification factor is set in a variable filter that functions as a high-pass filter. Specifically, (1) of FIG. 10 shows an example of a method for setting the amplification factor A of the amplification unit 19 with respect to the cut frequency F. In (1) of FIG. 10, the amplification factor A is a linear function of F, but may not be a linear function as long as it is monotonically increasing. Moreover, (2) and (3) of FIG. 10 are graphs showing the time change of the remaining battery capacity of the power storage system 5 during the frequency control, that is, the SOC (State of Charge). It is assumed that the controllable range of the remaining battery capacity of the power storage system 5 is, for example, the operation range B shown in the figure centering on 50%.

  (2) in FIG. 10 is a graph showing a case where the cut frequency F = FF, for example, and (3) in FIG. 10 is a graph when the cut frequency F is lower than FF. The solid line represents the SOC variation, and the dotted line represents the low frequency component of the SOC variation.

  As shown in (3) of FIG. 10, when the cut frequency F is lower than FF, the fluctuation of the low frequency component (dotted line) becomes larger than that in the case of F = FF in (2) of FIG. The sum of the high frequency component and the low frequency component easily exceeds the controllable range of the remaining battery level (SOC). For this reason, the amplification unit 19 decreases the amplification factor as the first frequency decreases. Therefore, by setting the amplification factor A to be smaller as the cut frequency F becomes lower, it is possible to make it difficult for the SOC fluctuation to exceed the SOC controllable range as shown in (3) of FIG.

  Next, a method for setting the amplification factor A when the variable filter unit 13 is used as a bandpass filter will be described.

  Note that the passband of the bandpass filter is changed from the cut frequency F1 to the cut frequency FH, and the cut frequency FH is variable. The cut frequency F1 may be zero.

  The amplifying unit 19 receives information on the cut frequency FH output from the variable filter unit 13, and changes the amplification factor A according to the cut frequency FH. At this time, the gain A is decreased as the cut frequency FH increases.

  FIG. 11 is a diagram for describing a case where an amplification factor is set in a variable filter that functions as a bandpass filter. Specifically, (1) of FIG. 11 shows an example of the amplification factor A of the amplification unit 19 with respect to the cut frequency FH. In (1) of FIG. 11, the amplification factor A is a linear function with respect to the cut frequency FH, but may not be a linear function as long as it decreases monotonously. Moreover, (2) and (3) in FIG. 11 are graphs showing the remaining time of the storage battery remaining amount, that is, the SOC of the power storage system 5 during the frequency control. The controllable range of the remaining battery level of the power storage system 5 is, for example, an operation range B shown in the figure centering on 50%.

  (2) in FIG. 11 is a graph when the cut frequency FH = FF, for example, and (3) in FIG. 11 is a graph when the cut frequency FH is lower than FF. The solid line represents the SOC variation, and the dotted line represents the low frequency component of the SOC variation.

  When the cut frequency FH is lower than FF as shown in (3) of FIG. 11, the fluctuation of the high frequency component is smaller than in the case of F = FF of (2) of FIG. 11, so that the SOC can control the SOC. It becomes easy to exceed the range. Therefore, as the cut frequency FH is increased, the high frequency component of the FR signal is increased and the fluctuation range thereof is increased. Therefore, the gain A is decreased. Thereby, it is possible to make it difficult for the SOC fluctuation to exceed the SOC controllable range.

  That is, in the operation of the storage battery control system 1c, in addition to each step in the operation of the storage battery control system 1b, the operation further includes an amplification step of amplifying or attenuating the FR signal including the control command value generated in the command value generation step. In the amplification step, the amplification factor is decreased as the first frequency is lowered.

<Embodiment 5>
In the storage battery control system 1 according to the fifth embodiment, the charge / discharge control unit 7 has a function of adding a predetermined charging signal to the FR signal according to the first embodiment in the frequency control time zone. In addition, the structure of the storage battery control system 1 is the same as FIG.

  FIG. 12 is a diagram for explaining a method of generating an output signal of the charge / discharge control unit, that is, a charge / discharge control signal of the storage battery.

  Specifically, (1) of FIG. 12 is a graph showing the time variation of the system frequency in the frequency control time zone (FR time zone) and the peak suppression control time zone (PS time zone). Here, the PS time zone is a time zone from time t103 to time t104. The reference frequency of the system frequency is 50 Hz.

  (2) of FIG. 12 is a graph showing the FR signal (FR (t)) generated by the FR signal generation unit 11 in the FR time period from time t101 to time t103. A solid line in (3) of FIG. 12 is a graph showing a charging signal (= FRA (t)) added to the FR signal in (2). Here, the charging signal is from the predetermined time (= TA) immediately before the PS time zone start time t103 to the PS time zone start time t103, that is, the time zone from time t101 to time t103, and It is positive only during a time zone in which the system frequency is higher than the reference frequency (50 Hz), that is, from time t101 to time t102, and zero otherwise. That is, the charge / discharge control unit 7 is between the time t101 and the start time t103, which is a first predetermined time TA before the start time t103 of the time zone (PS time zone) in which peak suppression control is performed, and the system frequency Is higher than the reference frequency of the system frequency, frequency control is performed using a charge signal obtained by adding a charge signal component to an FR signal including a control command value. In this case, it is preferable that the charge signal component is proportional to a low frequency component lower than the reciprocal of the power average time T1 among the fluctuation components of the system frequency. By determining the charging signal in this way, the charging signal works in a direction to suppress the frequency fluctuation of the system frequency.

  FIG. 13 is a graph showing frequency components of the charging signal. The charging signal is a low-frequency signal that varies at a lower frequency than the FR signal. When the maximum frequency of the low-frequency signal is F1, the maximum frequency F1 is preferably lower than the cut frequency F of the high-pass filter section. In FIG. 13, the maximum frequency F1 is higher than 1 / T1, but may be lower than 1 / T1.

  Here, for example, a method of calculating the charge signal component FRA (t) from time t101 to time t102 is as follows. When the fluctuation signal Δf (t) (> 0) of the system frequency is Δfl (t) that is a signal cut by a low-pass filter having a cut frequency F2 lower than 1 / T1, the charging signal component FRA (t) is It can be calculated by (Equation 6).

  FRA (t) = − b · Δfl (t) (b is a positive constant) (Expression 6)

  Furthermore, the charge / discharge signal FRT (t) for controlling the power storage system 5 can be calculated from the following (formula 7).

  FRT (t) = FR (t) + FRA (t) (Expression 7)

  (4) of FIG. 12 shows the time change of storage battery residual amount (SOC). In a normal time zone in which frequency control is performed (time zone before time t101), control is performed so that the average of SOC is close to approximately 50%. This is to make the life of the storage battery as long as possible.

  On the other hand, from the first predetermined time TA before the start time of the PS time zone, the SOC is greater than 50% by the charge signal of (3) in FIG. 12, and is 50% or more immediately before the start of peak suppression control. . As a result, after the PS time period ends, it can be avoided that the remaining battery charge (SOC) of the power storage system 5 is extremely lowered and the start of frequency control thereafter is delayed.

  That is, in the operation of the storage battery control system 1 according to the fifth embodiment, in the charge / discharge step in the operation of the storage battery control system 1 according to the first embodiment, the first predetermined time is higher than the start time of the time zone in which peak suppression control is performed. If it is from the time before the start time to the start time and the system frequency is higher than the reference frequency of the system frequency, a charge signal is generated by adding the charge signal component to the frequency control signal including the control command value, and the charging Frequency control may be performed based on the signal.

<Embodiment 6>
In the storage battery control system 1 according to the sixth embodiment, the charge / discharge control unit 7 also performs peak suppression control at the same time in the frequency control time zone. In addition, the structure of the storage battery control system 1 is the same as FIG.

  The FR signal is a high-frequency signal generated from the output of the high-pass filter unit 10. On the other hand, the peak suppression signal for peak suppression control is a low-frequency signal having a frequency component in a lower frequency range than the FR signal. When the maximum frequency of the low frequency signal is F2, the maximum frequency F2 is lower than the cut frequency F of the high-pass filter section.

  FIG. 14 is a graph showing frequency components of the peak suppression signal. In FIG. 14, the maximum frequency F2 is smaller than 1 / T1, but may be smaller than 1 / T1. A thick dotted line in FIG. 14 is a high-frequency signal that is an output signal of the FR signal generation unit 11. The solid line in FIG. 14 is an example of the low frequency signal of the peak suppression signal. The frequency control signal is a high frequency signal, and since the cut frequency F is larger than 1 / T1, the peak contract power is not exceeded due to the frequency control. On the other hand, since the low frequency signal of the peak suppression control has only a component lower than the cut frequency F, it does not affect the FR signal band. Thereby, since the FR signal and the peak suppression signal are completely separated on the frequency axis, the frequency control and the peak suppression control can be performed independently without the influence of each control signal.

  Even if peak suppression control is being performed as in the first embodiment, it is not necessary to stop frequency control, and thus revenue from the FR service may increase. However, when FR and peak suppression are performed simultaneously, a low-frequency component is added to the charge / discharge signal of the power storage system 5, which easily exceeds the operating range of the remaining battery charge (SOC). For this reason, the maximum value of charge / discharge power (current) in the frequency control needs to be set lower than that in the first embodiment.

  Since this causes a decrease in the FR revenue, the sixth embodiment may have a lower FR revenue than the first embodiment.

  FIG. 15 is a diagram illustrating an example of distribution of the maximum value of the charge / discharge current according to each of the frequency control and the peak suppression control when the frequency control and the peak suppression control are performed in the same time zone.

  (1) of FIG. 15 shows an example of distribution of the maximum value of the charge / discharge current according to each of frequency control and peak suppression control when frequency control and peak suppression control are performed in all time zones. The set value of the maximum charge / discharge current for peak suppression control is A1, and the set value of the maximum charge / discharge current during frequency control is A2. Although the frequency control and the peak suppression control are performed simultaneously, the sum of the maximum charge / discharge current (A1 + A2) is set so as not to exceed the controllable maximum charge / discharge current of the power storage system 5. In FIG. 15 (1), A1 and A2 are fixed values, but the distribution values may be variable according to the time zone.

  Also, there may be a time period during which peak suppression control and frequency control are not performed simultaneously.

  As shown in (2) of FIG. 15, peak suppression control and frequency control are performed simultaneously in a time zone in which the power consumption of the power load is likely to exceed the peak contract power, and at least a part of the other time is frequency control. It is good only as well. Thereby, in the case of only frequency control, the maximum discharge current A3 can be increased, and the income of FR can be increased.

  That is, in the operation of the storage battery control system 1 according to the sixth embodiment, even when the peak suppression control and the frequency control are performed in the same time zone in the charge / discharge step in the operation of the storage battery control system 1 according to the first embodiment. Good. In this case, it is preferable that the maximum frequency of the fluctuation component of the charge / discharge signal in the peak suppression control is lower than the first frequency.

<Embodiment 7>
FIG. 16 shows a configuration diagram of a storage battery control system 1d according to the seventh embodiment.

  The storage battery control system 1d of the seventh embodiment employs an FR signal measurement unit 23 in which a high-pass filter unit 22 is further added to the configuration of the FR signal measurement unit 18 of the storage battery control system 1b of the third embodiment. Further, the control device 6 of the storage battery control system 1d according to the seventh embodiment has the same configuration as the control device 6 of the storage battery control system 1 according to the first embodiment.

  The power detection unit 14 is a storage battery power detection unit that detects temporal changes in the charge / discharge power output from the power storage system 5. The power detection unit 14 transmits the detected time change of the output power of the power storage system 5 to the high-pass filter unit 22.

  The high-pass filter unit 22 cuts the low frequency component of the time-varying signal of the charge / discharge power and then transmits it to the storage unit 15. The cut frequency of the high-pass filter unit 22 is F3. F3 is larger than F2 defined in the sixth embodiment and smaller than F. As a result, only the frequency control signal having a component larger than the frequency F can be separated and extracted. That is, the high-pass filter unit 22 has a frequency region lower than the third frequency that is equal to or lower than the first frequency and equal to or higher than the second frequency, from the frequency variation based on the time change of the output power detected by the power detection unit 14. The second differential frequency including the fluctuation component corresponding to the frequency region higher than the third frequency is output by cutting the fluctuation component. The method for realizing the high-pass filter unit 22 may be realized in the same manner as the calculation method of (Equation 4) in the first embodiment, or a hardware high-pass filter may be used.

  The storage unit 15 stores the second differential frequency that is the output signal of the high-pass filter unit 22.

  The communication unit 16 has a function of receiving the result of the time change of the charge / discharge power stored in the storage unit 15 and transmitting the result using, for example, a line of the Internet 17.

  Thereby, it becomes possible to transmit the frequency control implementation result to the manager of the FR market.

  That is, in the operation of the storage battery control system 1d according to the seventh embodiment, in the measurement step in the operation of the storage battery control system 1b according to the third embodiment, further based on the time change of the output power detected in the detection step. A frequency component that includes a variation component corresponding to a frequency region higher than the third frequency by cutting a variation component in a frequency region that is equal to or lower than the first frequency and lower than the third frequency that is equal to or higher than the second frequency. Two differential frequencies may be output, and the second differential frequency may be stored in the storage unit 15.

(Other embodiments)
In storage battery control systems 1 and 1a to 1f according to Embodiments 1 to 7, control devices 6 and 6a to 6e are not particularly mentioned, but are installed in a building in which power load 4 and power storage system 5 are installed. It may be provided, or may be provided at a location remote from the building. That is, if the control devices 6 and 6a to 6e can receive the output signal from the power detection unit 3, transmit the charge / discharge control command signal to the power storage system 5, and acquire the frequency of the power system, It may not be installed in the same place as the place where the load 4 and the power storage system 5 are installed. That is, for example, the control devices 6 and 6a to 6e may be things that function as a server that controls charging and discharging of the power storage system 5 via a network.

  The storage battery control method, the control device, and the storage battery control system according to the present invention can be used as a storage battery control method, a control device, a storage battery control system, and the like using a power storage system in an apartment house, an accommodation facility, a hospital, and the like.

DESCRIPTION OF SYMBOLS 1, 1a-1d Storage battery control system 2 Electric power system 3, 14 Electric power detection part 4 Electric power load 5 Electric power storage system 6, 6a-6c Control apparatus 7 Charging / discharging control part 8 Peak prediction part 9 Frequency detection part 10, 22 High frequency filter part DESCRIPTION OF SYMBOLS 11 FR signal generation part 12 Low-pass filter part 13 Variable filter part 15 Storage part 16 Communication part 17 Internet 18, 23 FR signal measurement part 19 Amplification part 20 Remote control part 21 Remote control apparatus

Claims (16)

A storage battery control method for controlling charging and discharging of a power storage system connected to a power system and a power load,
A frequency detection step of detecting a system frequency which is a frequency of the power system;
Identifying the frequency change of the fluctuation component of the system frequency, and cutting the fluctuation component of the system frequency corresponding to the frequency region lower than the first frequency from the system frequency, thereby the system in the frequency region higher than the first frequency A high-frequency extraction step for outputting a first differential frequency including a frequency fluctuation component;
Using the first differential frequency, a command value generating step for generating a control command value for controlling charge / discharge power of the power storage system in order to suppress fluctuations in the grid frequency;
A charge / discharge step of performing frequency control for controlling charge / discharge of the power storage system so as to suppress fluctuations in the system frequency using the control command value;
In the high frequency extraction step, the first frequency is an average power consumption that is compared with predetermined contract power, and is an average value that is an average value of power supplied from the power system to the power load and the power storage system A storage battery control method that is higher than the reciprocal of unit time for calculating power consumption. The storage battery control method according to claim 1, wherein when the average power consumption exceeds the predetermined contract power, a power charge of a consumer who manages the power storage system increases. The storage battery control method according to claim 1 or 2, wherein in the charging / discharging step, peak suppression control for controlling charging / discharging of the power storage system is further performed so that the average power consumption is equal to or less than the predetermined contract power. The storage battery control method according to claim 3, wherein in the charge / discharge step, the frequency control and the peak suppression control are performed in different time zones. further,
A prediction step of predicting a peak time period in which the average power consumption exceeds the predetermined contract power;
In the charge / discharge step,
In the peak time zone, the peak suppression control is performed,
The storage battery control method according to claim 3 or 4, wherein the frequency control is performed in at least a part of a time zone that is not the peak time zone. further,
Cutting fluctuation components in a frequency region higher than the second frequency, which is a frequency higher than the first frequency, from frequency fluctuations based on temporal changes in power supplied from the power system to the power load and the power storage system. Including a low-frequency extraction step of outputting a differential frequency variation including a variation component corresponding to a frequency region lower than the second frequency,
The storage battery control method according to claim 5, wherein, in the prediction step, the peak time zone is predicted using the difference frequency fluctuation output in the low-frequency extraction step. further,
An amplification step of amplifying or attenuating a frequency control signal including the control command value generated in the command value generation step;
The storage battery control method according to any one of claims 1 to 6, wherein an amplification factor in the amplification step is decreased as the first frequency becomes lower. The storage battery control method according to any one of claims 1 to 7, wherein the first frequency is variable in the high-frequency extraction step. further,
Including an instruction generation step of receiving a remote instruction via the network and generating a change instruction for changing the first frequency to an instruction frequency indicated by the remote instruction;
The storage battery control method according to claim 8, wherein, in the high frequency extraction step, the first frequency is changed to the indicated frequency in accordance with the change instruction. In the charge / discharge step, the time is between a time before a first predetermined time before the start time of the time zone in which the peak suppression control is performed and the start time, and the system frequency is higher than a reference frequency of the system frequency 10. A storage battery control according to claim 1, wherein a charge signal obtained by adding a charge signal component to a frequency control signal including the control command value is generated, and the frequency control is performed based on the charge signal. Method. The storage battery control method according to claim 10, wherein the charge signal component is proportional to a low frequency component lower than an inverse of the unit time among the fluctuation components of the system frequency. In the charge and discharge step, the peak suppression control and the frequency control are performed in the same time zone,
The storage battery control method according to claim 3, wherein a maximum frequency of a fluctuation component of the charge / discharge signal in the peak suppression control is lower than the first frequency. further,
Including a measurement step of measuring the control command value,
In the measurement step,
Detecting the time change of the output power of the power storage system,
Storing the detected time change of the output power in a storage unit;
The storage battery control method according to any one of claims 1 to 12, wherein a result of time change of the output power stored in the storage unit is received and transmitted to an external device using a communication network. In the measurement step, a fluctuation component in a frequency region lower than the third frequency that is equal to or lower than the first frequency and equal to or higher than the second frequency is cut from the frequency fluctuation based on the time change of the detected output power. To output a second differential frequency including a fluctuation component corresponding to a frequency region higher than the third frequency,
The storage battery control method according to claim 13, wherein the second differential frequency is stored in the storage unit. A storage battery control device for controlling charging / discharging of a power storage system connected to a power system and a power load,
A frequency detection unit for detecting a system frequency that is a frequency of the power system;
A high-pass filter that identifies a frequency change of a fluctuation component of the system frequency and outputs a first differential frequency including a fluctuation component higher than the first frequency by cutting a fluctuation component lower than the first frequency from the system frequency And
A command value generation unit that generates a control command value for controlling charge / discharge power of the power storage system in order to suppress fluctuations in the grid frequency, using the first differential frequency output by the high-pass filter unit When,
A charge / discharge control unit that performs frequency control for controlling charge / discharge of the power storage system so as to suppress fluctuations in the system frequency using the control command value;
The high-pass filter unit is an average power consumption in which the first frequency is compared with a predetermined contract power, and is an average value that is an average value of power supplied from the power system to the power load and the power storage system A control device that is set higher than the reciprocal of unit time for calculating power consumption. A storage battery connected in parallel to the power load connected to the power system;
A power detection unit that measures temporal changes in power supplied from the power system to the power load and the power storage system;
The control apparatus of Claim 15 which controls charging / discharging of the said storage battery, A storage battery control system is provided.

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