JP2021052549A - Posiwatt trading support device and posiwatt trading method - Google Patents

Abstract

To prevent malfunction of a power storage battery system when posiwatt trading is performed using an existing power storage battery system.SOLUTION: A posiwatt trading support device (5) can be connected to a power storage battery system (1) that includes a power storage battery (11) that can supply power separately from power from the outside to a load (2) that receives power from the outside via a power receiving point, and a control device (10) that controls the discharge power of the power storage battery on the basis of the value of the receiving power at a receiving point, and controls the charging power from the receiving point to the power storage battery such that the value of the receiving power does not exceed a predetermined threshold value (Pcmax). The posiwatt transaction support device (5) calculates the value of a virtual receiving power to be input to the control device (10) on the basis of a target value (Psetx) of the receiving power calculated in response to a demand response command in the posiwatt transaction, and sets the change rate to be equal to or less than a predetermined change rate when the target value of the receiving power is changed from a first value to a second value.SELECTED DRAWING: Figure 1

Description

The present invention relates to a positive watt trading support device and a positive watt trading method.

The conventional power grid generally takes the form of supplying the power generated by a large-scale power plant such as a thermal power plant or a hydraulic power plant to a company or a household that is a consumer of electricity. In recent years, an electric power network using a virtual power plant (VPP) instead of a conventional electric power network has been attracting attention. Virtual power plants are decentralized by advanced energy management technology that makes full use of IoT in order to utilize widely used energy resources (distributed energy resources) such as solar power generation, storage batteries, electric vehicles, and negawatt (power saving). It controls the energy resources of the power plant remotely and in an integrated manner, and realizes a function as if it were a single power plant.

In recent years, the development of technology for negawatt trading, which is one of the distributed energy resources of virtual power plants, is progressing.

Here, a virtual power plant is a power plant in which a holder or a third party of a distributed energy resource such as a power generation facility or a power storage facility directly connected to a power system controls the distributed energy resource. Providing equivalent functions. The virtual power plant is composed of, for example, a resource aggregator, an aggregation coordinator, and the like.

A resource aggregator is a business operator that controls power resources by directly concluding a virtual power plant service contract with a customer. An aggregation coordinator is a business operator that bundles electric power controlled by a resource aggregator and directly trades electric power with a general power transmission and distribution business operator or a retail electric power business operator. In addition, the negawatt transaction refers to a transaction for reducing the demand for electric power in response to a request from, for example, a power transmission and distribution business operator or a resource aggregator.

For example, Patent Document 1 discloses a negawatt trading support device for realizing negawatt trading using an existing storage battery system having a power receiving power adjusting function for adjusting the power received at a power receiving point to power equal to or less than the contract power threshold. ing.

The negawatt trading support device disclosed in Patent Document 1 monitors the received power at the receiving point (hereinafter, also referred to as “power receiving point”) so that the receiving point power does not exceed a predetermined threshold (load tracking threshold). It is connected to the front stage of the storage battery system equipped with a load tracking function that discharges the storage battery and supplies power to the load, and realizes negawatt trading by adjusting the apparent value of the received power and inputting it to the storage battery system. It is a device.

Specifically, the negawatt transaction support device disclosed in Patent Document 1 uses a value based on a target reduction amount of received power included in a command (demand response command) for instructing a demand response that triggers negawatt trading. The virtual power received is calculated by adding it to the measured value of, and input to the storage battery system. The storage battery system controls the discharge power of the storage battery and supplies it to the load based on the virtual power received power that is apparently larger than the actual power receiving point power. As a result, it is possible to reduce the received power according to the demand response command without modifying the existing storage battery system.

JP-A-2018-160949

By the way, in the power grid including the virtual power plant, if the sunny weather continues during the period when the power demand drops such as Golden Week and the year-end and New Year, the power supply by renewable energy such as solar power generation will increase and the power supply will exceed the demand power. There is a risk. In this case, it is necessary to balance the supply and demand of electricity.

As a method of balancing the supply and demand of electric power in such a situation, it is conceivable to carry out a positive watt transaction, which is a transaction of an increase in electric power demand, between a power transmission and distribution business operator and a consumer. In positive watt trading, the transmission and distribution business operator issues a demand response command (hereinafter, also referred to as "negawatt command") that instructs the reduction of power consumption, and a denmand response command (hereinafter, also referred to as "negawatt command") that instructs the increase of power consumption. Hereinafter, it is also referred to as a “positive watt command”), and the consumer increases the power consumption in accordance with the positive watt command, so that the increased amount of power used by the customer is traded. By carrying out this positive watt transaction, it is possible to balance the supplied power and the required power in a situation where the supplied power exceeds the required power.

However, a storage battery system having a general power receiving power adjustment function has a predetermined threshold value set in advance (hereinafter, """ in order to prevent the power receiving point power from exceeding the contract power of the consumer when the storage battery is charged. It has a function to control the charging power of the storage battery so as not to exceed the "maximum power value of the power receiving point during charging" (hereinafter, also referred to as "maximum power limiting function of the receiving point during charging"), but from the outside. It does not have a function to control the charging of the storage battery according to the command of.

Further, the negawatt trading support device disclosed in Patent Document 1 described above has a function for using an existing storage battery system or the like for negawatt trading, and does not have a function for realizing positive watt trading.

Therefore, prior to the present application, the inventors of the present application have studied a positive watt transaction support device that enables positive watt transaction using an existing storage battery system having a power receiving power adjustment function. In response to the positive watt directive, this positive watt transaction support device adds the target increase in power based on the positive watt directive to the maximum power value Pcmax at the time of charging to calculate the virtual power received, which is the value of the actual power received at the power receiving point. Instead, it is a device that inputs to an existing storage battery system.

Since this positive watt transaction support device inputs a value of virtual power received that is smaller than the actual power received at the power receiving point into the storage battery system, the storage battery system responds to the difference between the maximum power value at the power receiving point during charging and the virtual power received. The storage battery can be charged with the generated power. As a result, it is possible to increase the received power at the receiving point in accordance with the DR directive, and it is possible to realize positive watt trading.

However, it has been found that the storage battery system malfunctions under predetermined conditions when the above-mentioned positive watt transaction support device is used. As a result of examining such a problem, the following findings were obtained.

The positive watt transaction support device attempts to realize positive watt transaction by controlling the input of the storage battery system, but since the control timing of the existing storage battery system equipped with the load tracking function differs for each system, the two are matched. It's not easy.

The value of the received power (virtual power received) input from the positive watt transaction support device by the storage battery system because the timing when the positive watt transaction support device makes a control input to the storage battery system and the control timing in the storage battery system do not match. It turned out that the storage battery system malfunctioned because it could not cope with the sudden change in the power consumption. It is considered that this is because the storage battery system cannot cooperate with the positive watt transaction support device when there is a sudden change in the control input value.

For example, some storage battery systems have a function of being controlled so as to systematically charge and discharge regardless of the value of the received power. In this case, in the storage battery system, the control target value of the storage battery is set to the value of the received power (virtual power received) to be monitored (control input value) and the value set for planned charging and discharging (planned operation). The larger value) may be selected at the control timing of the storage battery system.

In such a case, the value to be selected in the storage battery system is "" even though the "control input value" drops sharply and the magnitude relationship between the "control input value" and the "planned operation value" is switched. The storage battery system may malfunction due to the sudden drop in the "control input value" being selected without switching from the "control input value" to the "planned operation value".

It is considered that this is because the control cycle (control timing) of the storage battery system 1 does not match the input timing of the virtual power received by the positive watt transaction support device.

The present invention has been made in view of the above problems, and an object of the present invention is to prevent malfunction of the storage battery system when a positive watt transaction is performed using an existing storage battery system.

The apparatus according to a typical embodiment of the present invention includes a storage battery capable of supplying electric power separately from the external electric power to a load receiving electric power from the outside through the electric receiving point, and the electric power receiving point. The value of the received power in the above is input, the discharge power of the storage battery is controlled based on the value of the received power, and the storage battery is charged from the power receiving point so that the value of the received power does not exceed a predetermined threshold. A positive watt transaction support device that can be connected to a storage battery system equipped with a control device that controls electric power, and the target value of the received power calculated in response to a demand response command that requests an increase in the power used in the positive watt transaction. The value of the virtual received power is calculated based on the value of the received power and the predetermined threshold value, and is input to the control device in place of the value of the received power, and the target value of the received power is set to the first value. When changing from to a second value larger than the first value, the target value of the received power is changed so that the rate of change of the target value of the received power is equal to or less than a predetermined rate of change. And.

According to the present invention, it is possible to prevent malfunction of the storage battery system.

It is a figure which shows the structure of the positive watt trading apparatus which incorporated the positive watt transaction support apparatus which concerns on embodiment into an existing generator system. It is a figure for demonstrating operation of a storage battery system. It is a figure for demonstrating operation of a storage battery system. It is a timing chart which shows the outline of the operation of a storage battery system. It is a block diagram which shows an example of the structure of an output control part. It is a timing chart which shows an example of the operation of an output control part. It is a timing chart which shows the change of each electric power before and after DR activation in the positive watt trading apparatus which concerns on embodiment. It is a figure which shows each electric power of the positive watt trading apparatus which concerns on 1st Embodiment at a predetermined time in FIG. It is a figure which shows each electric power of the positive watt trading apparatus which concerns on 1st Embodiment at a predetermined time in FIG. It is a figure which shows each electric power of the positive watt trading apparatus which concerns on 1st Embodiment at a predetermined time in FIG. It is a figure which shows each electric power of the positive watt trading apparatus which concerns on 1st Embodiment at a predetermined time in FIG. It is a figure which shows each electric power of the positive watt trading apparatus which concerns on 1st Embodiment at a predetermined time in FIG.

1. 1. Outline of Embodiment First, an outline of a typical embodiment of the invention disclosed in the present application will be described. In the following description, as an example, reference numerals on drawings corresponding to the components of the invention are described in parentheses.

[1] The positive watt transaction support device (5) according to a typical embodiment of the present invention has the power from the outside with respect to the load (2) that receives power from the outside via the power receiving point. Separately, a storage battery (11) capable of supplying power and a value of the received power at the receiving point are input, the discharge power of the storage battery is controlled based on the value of the received power, and the value of the received power is predetermined. It is a positive watt transaction support device (5) that can be connected to a storage battery system (1) including a control device (10) that controls the charging power from the power receiving point to the storage battery so as not to exceed the threshold value. The positive watt transaction support device (5) has the target value (Psetx) of the received power calculated in response to the demand response command requesting an increase in the power used in the positive watt transaction, the value of the received power (PjA), and the predetermined value. The value of the virtual received power (PjB) is calculated based on the threshold value (Pcmax) of, and is input to the control device in place of the value of the received power (PjA), and the target value of the received power is set to the first value. When changing from to a second value larger than the first value, the target value of the received power is changed so that the rate of change of the target value of the received power is equal to or less than a predetermined rate of change. And.

[2] When the target value (Psetx) of the received power is changed from the first value to the second value in the positive watt transaction support device according to the above [1], the target value (Psetx) of the received power. May be changed stepwise from the first value to the second value at predetermined time intervals.

[3] The positive watt transaction support device according to the above [2] includes a received power target value determining unit that determines a target value of the received power in response to a demand response command requesting an increase in power used in the positive watt transaction. In response to the demand response command, the sum of the value of the received power and the target value of the received power is added to the predetermined threshold value to calculate the value of the virtual received power, and the virtual power received is input to the control device. It has a power calculation unit and a schedule management unit that instructs execution and stop of the power adjustment process in response to the demand response command. In the received power target value determination unit, the schedule management unit stops the power adjustment process. When instructed, the target value of the received power may be changed stepwise from the value set immediately before to zero at the predetermined time intervals.

[4] A method according to a typical embodiment of the present invention includes a storage battery capable of supplying electric power separately from the external electric power to a load receiving electric power from the outside via a receiving point. The value of the received power at the power receiving point is input, the discharge power of the storage battery is controlled based on the value of the received power, and the storage battery is controlled from the power receiving point so that the value of the received power does not exceed a predetermined threshold. It is a positive watt transaction support method that supports positive watt transaction using a storage battery system equipped with a control device for controlling charging power to the power. In this positive watt transaction support method, the first step of receiving a demand response command requesting an increase in power consumption in positive watt transaction, the target value of the received power calculated in response to the demand response command, and the value of the received power. The second step of calculating the value of the virtual received power based on the predetermined threshold value and inputting the value of the received power to the control device in place of the value of the received power, and the target value of the received power from the first value. When changing to a second value larger than the first value, the third step of changing the target value of the received power so that the rate of change of the target value of the received power is equal to or less than a predetermined rate of change. , Is included.

[5] In the positive watt transaction support method of the above [4], the third step is a step of gradually changing the target value of the received power from the first value to the second value at predetermined time intervals. May include.

2. Specific Examples of Embodiments Hereinafter, specific examples of embodiments of the present invention will be described with reference to the drawings. In the following description, the same reference numerals will be given to the components common to each embodiment, and the repeated description will be omitted.

FIG. 1 is a diagram showing a configuration of a positive watt trading device in which a positive watt trading support device according to an embodiment of the present invention is incorporated into an existing storage battery system.
The positive watt trading device 100 is installed on the premises of a customer, for example, and receives power in response to a demand response command (hereinafter, also referred to as “DR command”) transmitted from a resource aggregator or the like constituting a virtual power plant. It is a system that enables positive watt trading by increasing the power received in.

As shown in FIG. 1, the positive watt trading device 100 includes a storage battery system 1 and a positive watt trading support device 5 provided in front of the storage battery system 1 (control device 10).

The storage battery system 1 is a facility provided with a storage battery that supplies power separately from the received power to the load 2 to which the received power is supplied at the power receiving point of the consumer and can be charged by the received power at the receiving point. .. For example, the storage battery system 1 is an existing system on the premises of a customer.

As shown in FIG. 1, the storage battery system 1 includes a control device 10, a storage battery 11, and a power conversion unit 12. The storage battery system 1 has, as an operation mode, a charge mode for charging the storage battery 11 and a discharge mode for discharging the storage battery 11. The storage battery system 1 operates so that the charging power of the storage battery 11 changes according to the received power in the charging mode, and operates so that the discharging power of the storage battery 11 changes according to the received power in the discharging mode.

The storage battery 11 is a secondary battery that can be recharged repeatedly, and is, for example, a sodium-sulfur battery.

The power conversion unit 12 is controlled by a control device 10 described later, and converts power between the storage battery 11, the load 2, and the system. The power conversion unit 12 is, for example, an AC / DC conversion device. For example, in the charging mode, the power conversion unit 12 converts alternating current power (AC) from the receiving point into direct current power (DC) and supplies it to the storage battery 11 in response to an instruction from the control device 10, and in the discharging mode. According to the instruction from the control device 10, the DC power from the storage battery 11 is converted into AC power and supplied to the load 2. In the discharge mode, the power Pc from the storage battery 11 and the power from the power receiving point are supplied to the load 2, so that the power supplied from the outside (system) to the power receiving point (power receiving point power) can be reduced. It will be possible.

The control device 10 is a device for controlling the power conversion unit 12 to control the charging / discharging of the storage battery 11. The control device 10 has, as hardware resources, for example, a processor such as a CPU, various storage devices such as a RAM and a ROM, a timer (counter), an A / D conversion circuit, a D / A conversion circuit, and input / output. It is provided with a program processing device (for example, a microcontroller) having a configuration in which peripheral circuits such as an I / F circuit are connected to each other via a bus.

As shown in FIG. 1, the control device 10 includes a discharge control unit 14, a charge control unit 15, and a mode switching unit 16 as functional blocks for realizing a function of adjusting the discharge power and the charge power of the storage battery 11. It has a power adjustment value output unit 17. In these functional blocks, for example, in the program processing device (microcontroller) as a hardware resource constituting the control device 10 described above, the processor executes various operations according to the program stored in the storage device, and the input / output I / It is realized by controlling peripheral circuits such as an F circuit and a timer. In the present embodiment, the functional blocks of the control device 10 will be described as being realized by program processing, but some or all of the functional blocks may be realized by a hardware logic circuit or the like.

The load power calculation unit 13 calculates the value of the load power PLB by adding, for example, the value of the input power received and the value of the power Pc of the storage battery 11.

In the present embodiment, the power (discharge power) Pc when the storage battery 11 is discharged is represented by a positive value, and the power (charge power) Pc when the storage battery 11 is charged is represented by a negative value. To do.

The discharge control unit 14 controls the discharge power of the storage battery 11 in the discharge mode. The discharge control unit 14 calculates the discharge power adjustment value Pda, which is the target value of the discharge power of the storage battery 11, based on the value of the load power PLB calculated by the load power calculation unit 13. Specifically, the discharge control unit 14 monitors the value of the load power PLB and calculates the discharge power adjustment value Pda so that the value of the load power PLB does not exceed a preset threshold value (load tracking threshold value).

The charge control unit 15 controls the charge power of the storage battery 11 in the charge mode. The charge control unit 15 calculates the charge power adjustment value Pca, which is the target value of the charge power of the storage battery 11, based on the value of the load power PLB calculated by the load power calculation unit 13. The details of the charge control unit 15 will be described later.

The mode switching unit 16 controls switching of the operation mode of the storage battery system 1. The mode switching unit 16 switches the operation mode of the storage battery system 1 according to, for example, the mode designation signal Sm input from the outside.

For example, the mode switching unit 16 is a switch unit SWd connected between the discharge control unit 14 and the power adjustment value output unit 17, and a switch connected between the charge control unit 15 and the power adjustment value output unit 17. It has a part SWc and.

The switch unit SWd is turned on when the mode designation signal Sm that specifies the discharge mode is input, and is turned off when the mode designation signal Sm that specifies the charging mode is input. On the other hand, the switch unit SWc is turned on when the mode designation signal Sm that specifies the charging mode is input, and is turned off when the mode designation signal Sm that specifies the discharge mode is input.

Therefore, when the discharge mode is specified by the mode designation signal Sm, the switch unit SWd is turned on and the switch unit SWc is turned off, so that the mode switching unit 16 has the discharge power adjustment value Pda calculated by the discharge control unit 14. Is output. On the other hand, when the charging mode is specified by the mode designation signal Sm, the switch unit SWd is turned off and the switch unit SWc is turned on, so that the mode switching unit 16 is charged with the charging power adjustment value Pca calculated by the charging control unit 15. Is output.

Here, the operation mode is designated by the mode designation signal Sm, for example, by the user operating the input interface (for example, a touch panel or a mechanical switch) of the storage battery system 1. For example, when the user operates the input interface of the storage battery system 1 to specify the operation mode, the mode designation signal Sm corresponding to the designated operation mode is input to the mode switching unit 16. As described above, the mode switching unit 16 outputs a power adjustment value (discharge power adjustment value Pda or charge power adjustment value Pca) according to the operation mode designated by the mode designation signal Sm.

The power adjustment value output unit 17 outputs the discharge power adjustment value Pda or the charge power adjustment value Pca input from the mode switching unit 16 to the power conversion unit 12. For example, when the discharge power adjustment value Pda is input from the mode switching unit 16, the power adjustment value output unit 17 outputs the discharge power adjustment value Pda to the power conversion unit 12, and the mode switching unit 16 outputs the discharge power adjustment value Pda. When the charging power adjustment value Pca is input, the charging power adjustment value Pca is output to the power conversion unit 12.

The power conversion unit 12 controls charging / discharging of the storage battery 11 according to the power adjustment value input from the power adjustment value output unit 17. The power conversion unit 12 controls the discharge of the storage battery 11 so that the discharge power of the storage battery 11 matches the discharge power adjustment value Pda in the discharge mode, and the charge power of the storage battery 11 becomes the charge power adjustment value Pca in the charge mode. The charging of the storage battery 11 is controlled so as to match.

Next, the details of the charge control unit 15 will be described.
The charge control unit 15 monitors the value of the load power PLB and calculates the charge power adjustment value Pca so that the value of the load power PLB does not exceed a preset threshold value (maximum power value Pcmax of the power receiving point during charging). .. Specifically, the charge control unit 15 has a power receiving point maximum power setting unit 150 during charging, a charge power adjustment value calculation unit 151, an output limit unit 152, and a maximum value selection unit 153.

The charging power receiving point maximum power setting unit 150 sets the charging power receiving point maximum power value Pcmax. Here, the maximum power value Pcmax at the power receiving point during charging is a threshold value for limiting the charge amount of the storage battery 11 so that the power received at the power receiving point at the time of charging the storage battery 11 does not exceed the contracted power of the consumer. In the storage battery system 1, the charging power Pc of the storage battery 11 is adjusted with reference to the maximum power value Pcmax at the power receiving point during charging.

As the maximum power value Pcmax at the power receiving point during charging, for example, a value according to the contracted power of the consumer is set. For example, by setting the maximum power receiving point Pcmax at the time of charging to a value lower than the contracted power, the storage battery system 1 can operate with a margin. The maximum power value Pcmax at the power receiving point during charging is not limited to one, and a plurality of Pcmax may be set so that the threshold value for control can be selected.

The charging power adjustment value calculation unit 151 calculates the charging power adjustment value Pca. The charging power adjustment value Pca is a target value of the charging power of the storage battery 11 for charging the storage battery 11 so that the received power at the receiving point does not exceed the maximum power receiving point Pcmax at the time of charging.

Specifically, the charging power adjustment value calculation unit 151 calculates the charging power adjustment value Pca by subtracting the maximum power receiving point Pcmax at the time of charging from the value of the load power PLB calculated by the load power calculation unit 13. ..

The output limiting unit 152 is input with the charging power adjustment value Pca calculated by the charging power adjustment value calculation unit 151, and the input charging power adjustment value Pca is a negative value (for example, a value in the range of -9999 to 0). If, the input charging power adjustment value Pca is output as it is, and if the charging power adjustment value Pca is a positive value, the charging power adjustment value Pca is output as “0”.

The maximum value selection unit 153 inputs the charging power adjustment value Pca output from the output limiting unit 152 and the charging power setting value Pcst, and outputs whichever is larger to the mode switching unit 16.

Here, the charging power setting value Pcst is an upper limit value of the charging power of the storage battery 11, and is set in advance by, for example, the user operating the input interface of the storage battery system 1.

For example, when the charging power setting value Pcst is -2000 kW and the charging power adjustment value Pca calculated by the charging power adjustment value calculation unit 151 is -3000 kW, the maximum value selection unit 153 sets the charging power setting value Pcst (= -2000 kW). ) Is output as the charging power adjustment value Pca. The charging power adjustment value Pca output from the maximum value selection unit 153 is input to the power conversion unit 12 via the mode switching unit 16 and the power adjustment value output unit 17.

In this way, the maximum value selection unit 153 selects the larger of the charging power adjustment value Pca and the charging power set value Pcst, so that the power received at the receiving point (power of the load 2) becomes the maximum power at the receiving point during charging. Even if the value is sufficiently lower than the value Pcmax and the storage battery 11 can be charged a lot, the charging power of the storage battery 11 is limited to the charging power set value Pcst or less.

Next, the operation of the storage battery system 1 will be described with reference to the drawings. Here, the operation of the storage battery system 1 will be described with reference to a configuration example of the existing storage battery system 1 having a power receiving power adjustment function to which the positive watt transaction support device 5 is not connected.

2A and 2B are diagrams for explaining the operation of the storage battery system 1.
In the storage battery system 1 shown in FIGS. 2A and 2B, it is assumed that the maximum power receiving point during charging is set to Pcmax = 4000 kW, the charged power set value is set to Pcst = −2000 kW, and the initial value of the actual power of the load 2 is 1000 kW. FIG. 2A shows a numerical example of each electric power in the storage battery system 1 when the discharge mode is switched to the charge mode, and FIG. 2B shows each of the electric powers in the storage battery system 1 when the actual power of the load increases in the charge mode. Numerical examples of power are shown.

As shown in FIGS. 2A and 2B, in the configuration example of the existing storage battery system 1 having the power received power adjustment function to which the positive watt transaction support device 5 is not connected, the actual power received PjA received at the power receiving point of the consumer. The value is directly input to the control device 10 as the value of the received power.

As shown in FIG. 2A, when the discharge mode is specified by the mode designation signal Sm, the discharge power adjustment value Pda is selected by the mode switching unit 16, and the discharge power adjustment value Pda causes the power adjustment value output unit 17. It is input to the power conversion unit 12 via. Here, it is assumed that the discharge power adjustment value Pda = 0 kW, and the power conversion unit 12 does not discharge the storage battery 11.

Next, consider the case where the operation mode is switched from the discharge mode to the charge mode by the mode designation signal Sm. In this case, when the operation mode is switched to the charging mode, the storage battery 11 is neither charged nor discharged, so that the power Pc of the storage battery 11 is 0 kW. On the other hand, as shown in FIG. 2A, since the power of the load 2 is 1000 kW, the actual power received PjA at the power receiving point is 1000 kW. Therefore, the value of the load power PLB of the load 2 calculated by the load power calculation unit 13 is the same value (= 1000 kW) as the actual received power PjA.

The charge control unit 15 subtracts the maximum power value Pcmax (= 4000 kW) at the receiving point during charging from the load power PLB (= 1000 kW) to calculate the charge power adjustment value Pca (= -3000 kW). In this case, since the calculated charge power adjustment value Pca (= -3000 kW) is a negative value, the output limiting unit 152 has the charge power adjustment value Pca (= -3000 kW) calculated by the charge power adjustment value calculation unit 151. ) Is output to the maximum value selection unit 153 as it is.

In this case, since the charging power adjustment value Pca (= -3000 kW) is smaller than the charging power set value Pcst (= -2000 kW), the maximum value selection unit 153 sets the charge power set value Pcst (= -2000 kW) to the mode switching unit. Output to 16.

Since the charge mode is specified by the mode designation signal Sm in the mode switching unit 16, the charge power set value Pcst (= -2000 kW) output from the charge control unit 15 (maximum value selection unit 153) is selected to generate power. The adjustment value output unit 17 outputs the charging power set value Pcst (= −2000 kW) to the power conversion unit 12. As a result, the power conversion unit 12 starts charging the storage battery 11 and controls the power supply from the power receiving point to the storage battery 11 so that the charging power of the storage battery 11 matches the charging power set value Pcst (= −2000 kW). To do.

When charging of the storage battery 11 is started, power is supplied from the power receiving point to the load 2 and the storage battery 11, so that the actual power received PjA at the power receiving point increases. When the charging power of the storage battery 11 reaches the target value of −2000 kW, the actual power received PjA at the power receiving point is equal to the power (= 2000 kW) of the storage battery 11 from the initial value (= 1000 kW). It becomes a large value (= 3000 kW). On the other hand, since the charging power Pc of the storage battery 11 is −2000 kW, the value of the load power PLB calculated by the load power calculation unit 13 is the same value as at the start of charging (1000 kW (= 3000 kW-2000 kW)). , Charging control will continue.

Next, consider the case where the actual power of the load 2 increases from 1000 kW to 3000 kW while the storage battery 11 is being charged. In this case, as shown in FIG. 2B, when the actual power of the load increases, the value of the load power PLB calculated by the load power calculation unit 13 increases from 1000 kW to 3000 kW, and the charge input to the maximum value selection unit 153. The power adjustment value Pca increases from -3000 kW to -1000 kW.

In this case, since the charging power adjustment value Pca (= -1000kW) is larger than the charging power setting value Pcst (= -2000kW), the maximum value selection unit 153 sets the charging power adjustment value Pca (= -1000kW) to the mode switching unit. Output to 16.

The mode switching unit 16 selects the charging power adjustment value Pca (= -1000 kW) output from the charging control unit 15 (maximum value selection unit 153), and the power adjustment value output unit 17 selects the charging power adjustment value Pca (=-). 1000 kW) is output to the power conversion unit 12. As a result, the power conversion unit 12 supplies power to the storage battery 11 so that the charging power of the storage battery 11 matches the charging power adjustment value Pca (= -1000 kW) instead of the charging power set value Pcst (= -2000 kW). The actual power received PjA becomes 4000 kW.

In this way, the storage battery system 1 controls the charging power Pc so as not to exceed the maximum power receiving point (4000 kW) at the time of charging even when the actual power of the load 2 increases during charging of the storage battery 11.

FIG. 3 is a timing chart showing an outline of the operation of the storage battery system 1.
In FIG. 3, the horizontal axis represents time and the vertical axis represents electric power. Further, in FIG. 3, reference numeral 301 represents the actual power of the load 2, reference numeral 302 represents the actual received power PjA, and reference numeral 303 represents the power (charging power) Pc of the storage battery 11. Further, reference numeral 304 indicates the actual power received when the storage battery 11 is charged with a constant charging power (= charging power set value Pcst) when the storage battery system 1 does not have the power receiving point maximum power limiting function at the time of charging. It represents PjA.
In FIG. 3, for convenience of illustration, the sign of the electric power (charging power) Pc when the storage battery 11 is charged is set to “positive (+)”.

First, when the charging power set value Pcst is set and switched to the charging mode, as shown in FIG. 3, the control device 10 determines the charging power Pc of the storage battery 11 so that the charging power Pc matches the charging power set value Pcst. To control.

In this case, the control device 10 sets the charging power Pc to the charging power set value Pcst during the period in which the actual power receiving power PjA does not exceed the maximum power receiving point Pcmax at the time of charging (for example, the period from time t1 to time t2). The charging power Pc of the storage battery 11 is controlled so as to match, and the period during which the actual received power PjA exceeds the maximum power value Pcmax at the receiving point during charging (for example, the period from time t0 to time t1 and the period from time t2 to time t3). ), The storage battery 11 is charged by the difference between the maximum power value Pcmax at the power receiving point during charging and the actual power of the load 2.

On the other hand, during a period in which the actual power of the load 2 is larger than the maximum power value Pcmax at the receiving point during charging (for example, a period from time t3 to time t4), the control device 10 stops charging the storage battery 11.

As described above, in the charging mode, the control device 10 of the storage battery system 1 has the charging power Pc of the storage battery 11 so that the total value of the received power and the charging power Pc of the storage battery 11 does not exceed the maximum power value Pcmax of the power receiving point during charging. Therefore, it is possible to prevent the actual received power PjA from exceeding the contracted power by charging the storage battery 11. Assuming that the storage battery system 1 does not have the power receiving point maximum power limiting function during charging and the storage battery 11 is charged with a constant charging power (= charging power set value Pcst) regardless of the actual power of the load 2. As shown by reference numeral 304, the actual received power PjA becomes large, and the possibility of exceeding the contract power becomes very high.

Next, the positive watt transaction support device 5 will be described.
Instead of the target value of the feedback system in the storage battery system 1 described above, the positive watt transaction support device 5 uses a value corresponding to the DR command value (value specified in the demand response) that triggers the positive watt transaction as a new target value. This is a device for controlling the storage battery system 1.

The positive watt transaction support device 5 has, as hardware resources, for example, a processor such as a CPU, various storage devices such as a RAM and a ROM, a timer (counter), an A / D conversion circuit, and a D / A conversion circuit. It is provided with a program processing device (for example, a microcontroller) having a configuration in which peripheral circuits such as input / output I / F circuits are connected to each other via a bus. Further, the positive watt transaction support device 5 also includes, for example, a communication circuit for performing wired or wireless communication with a higher-level device such as a resource aggregator or a storage battery system 1.

The positive watt transaction support device 5 has a target value of the received power calculated in response to a demand response command (positive watt command) requesting an increase in the power used in the positive watt transaction, a value of the received power, and a predetermined threshold value (power receiving point at the time of charging). The value of the virtual received power is calculated based on the maximum power value Pcmax), and is input to the control device 10 of the storage battery system 1 in place of the value of the received power.

The positive watt transaction support device 5 is a target of the received power in order to prevent a malfunction caused by a mismatch between the control cycle (control timing) of the storage battery system 1 described above and the input timing of the virtual received power from the positive watt transaction support device 5. When changing the value from the first value to the second value larger than the first value, the target value of the received power is changed so that the rate of change of the target value of the received power is equal to or less than the predetermined rate of change. ..

Specifically, when the positive watt transaction support device 5 changes the target value of the received power from the first value to the second value, the target value of the received power is changed from the first value to the second value for a predetermined time. Change step by step. For example, when the power adjustment process (DR) based on the positive watt directive is terminated, if the target value of the received power during DR is P1 and the target value of the received power after the end of DR is P2 (> P1), the positive watt transaction support The device 5 changes the target value of the received power from P1 to P2 stepwise (stepwise) by ΔP every predetermined time ΔT.

As shown in FIG. 1, the positive watt transaction support device 5 has a DR command receiving unit 51, a schedule management unit 52, and received power as functional blocks for realizing a function of supporting a positive watt transaction using the storage battery system 1 described above. It has a target value determination unit 53, a baseline calculation unit 54, a positive watt setting unit 57, and a virtual power receiving power calculation unit 59. These functional blocks, for example, in the above-mentioned program processing device (microcontroller), the processor executes various operations according to the program stored in the storage device, and peripheral circuits such as an input / output I / F circuit and a timer and the above-mentioned communication. It is realized by controlling the circuit.

In the present embodiment, the above functional blocks of the positive watt transaction support device 5 will be described as being realized by program processing, but some or all of these functional blocks are realized by a hardware logic circuit or the like. May be good.
Hereinafter, each functional block constituting the positive watt transaction support device 5 will be described in detail.

The DR command receiving unit 51 receives a DR command from a higher-level device such as a resource aggregator. The DR command includes, for example, DR activation time data 510 and Pt data 511, which is a target value (hereinafter, also referred to as “target reduction amount”) of the power reduction amount by DR.

For example, in the DR activation time data 510, as information for specifying the period for activating the DR, information for specifying the time for activating the DR (DR start time) and information for specifying the time for stopping the DR (DR end) Time) and is included. In the case of the DR command (negative watt command) that instructs the reduction of the received power, the target reduction amount Pt of a positive value is input, and in the case of the DR command (positive watt command) that instructs the increase of the received power, the negative value. The target reduction amount Pt is input. For example, in the case of the negawatt command instructing the reduction of electric power of 500 kW, the target reduction amount Pt = 500 kW, and in the case of the positive watt directive instructing the increase of electric power of 1000 kW, the target reduction amount Pt = −1000 kW.

The baseline calculation unit 54 calculates the value of the baseline P0.

Here, the baseline P0 is a value that serves as a reference when the consumer reduces the received power in accordance with the DR directive in the negawatt trading and the positive watt trading. For example, baseline P0 is the average value of load power or received power at a predetermined time for the consumer over the past few days. For example, the average value of the load power specified every 30 minutes in the past 5 days can be used as the value of the baseline P0 in the DR activation period. When DR is activated, it is preferable that the load power PLB of the day and the baseline P0 of the consumer are close to each other. In this embodiment, it is assumed that a value based on the received power immediately before the DR is activated is calculated as the value of the baseline P0.

The schedule management unit 52 executes the power adjustment process for adjusting the received power at the power receiving point based on the DR command (hereinafter, also referred to as “invocation of DR”) and stops the power adjustment process (hereinafter, “stop of DR””. Also referred to as). The schedule management unit 52 outputs a DR activation command signal X indicating whether or not DR can be activated based on the DR activation time data 510 included in the DR command received by the DR command receiving unit 51.

The schedule management unit 52 has, for example, a timer that performs time counting, and when the DR command receiving unit 51 receives a DR command, the DR start time and the DR end time included in the DR activation time data 510 are set to the timer. Set.

The schedule management unit 52 normally outputs a DR activation command signal X (= 0) instructing to stop the activation of DR. The schedule management unit 52 outputs a DR activation command signal X (= 1) instructing the activation of DR when the measured time coincides with the set start time. After that, when the measured time coincides with the set DR end time, the DR activation command signal X (= 0) instructing to stop the activation of DR is output again.

The received power target value determination unit 53 determines the received power target value Psetx in response to the DR command. The received power target value Psetx is a target value of the received power when adjusting the received power at the receiving point according to the DR command.

Further, when the schedule management unit 52 instructs the schedule management unit 52 to stop the power adjustment process (stop the DR), the received power target value determining unit 53 sets the received power target value Psetx every predetermined time from the value set immediately before. Gradually change to zero.

Specifically, the received power target value determination unit 53 includes a control target value calculation unit 530, a control target value output unit 533, and an output control unit 534. The control target value calculation unit 530 calculates the control target value Pset based on the target reduction amount Pt included in the DR command received by the DR command reception unit 51 and the baseline P0 calculated by the baseline calculation unit 54. To do.

Here, the control target value Pset is a target value of the received power required to achieve the target reduction amount Pt specified by the DR directive.

The control target value calculation unit 530 calculates the control target value Pset (= P0-Pt) by subtracting the target reduction amount Pt from the value of the baseline P0.

The control target value output unit 533 controls the output of the control target value Pset based on the DR activation command signal X. The control target value output unit 533 is, for example, a multiplication circuit, and outputs a value obtained by multiplying the DR activation command signal X (= “1” or “0”) by the control target value Pset.

When the DR activation command signal X is a value (X = 0) indicating to stop the activation of the DR, the control target value output unit 533 outputs the control target value Pset as “0”, and the DR activation command signal X is output. When the value (X = 1) instructing the activation of DR, the control target value Pset output from the control target value calculation unit 530 is output as it is.

The output control unit 534 controls the output of the received power target value Psetx.
Specifically, when the output control unit 534 executes the power adjustment process according to the positive watt command (when the DR activation command signal X = 1), the control target value Pset output from the control target value output unit 533 is set to ". The value multiplied by -1 ”is output as the received power target value Psetx (= −Pset). On the other hand, when the power adjustment process corresponding to the positive watt command is stopped (when the DR activation command signal X = 0), the received power target value Psetx is output as “0”.

Further, when the output control unit 534 stops executing the power adjustment process according to the positive watt command (when the DR activation command signal X is switched from "1" to "0"), the output control unit 534 sets the received power target value Psetx immediately before. From the value obtained by multiplying the control target value Pset output from the control target value output unit 533 by "-1" (first value) to "0 (second value)", ΔP each for a predetermined time ΔT. Output by changing in stages.

Here, the time when the received power target value Psetx changes from the first value Px to the second value Py is the control cycle of the storage battery system 1, for example, the maximum value selection unit 153 charges with the charging power adjustment value Pca. It is preferable that the cycle is longer than the cycle for determining the magnitude relationship with the power set value Pcst. For example, when the control cycle of the storage battery system 1 is 10 seconds, the time for changing from the first value Px to the second value Py is set to 60 seconds.

More preferably, when the received power target value Psetx input to the storage battery system 1 is changed from the first value Px to the second value Py, the rate of change ΔP / ΔT of the received power target value Psetx is a predetermined rate of change α. It is set to be as follows.

Here, the predetermined rate of change α is a value peculiar to the storage battery system 1 determined based on the specifications of the storage battery system 1 used in the positive watt trading device 100. For example, the predetermined rate of change α is the cycle in which the maximum value selection unit 153 of the target storage battery system determines the magnitude relationship between the charging power adjustment value Pca and the charging power set value Pcsst, and the magnitude relationship by the maximum value selection unit 153. It is determined based on the charging power set value Pcst, which is one of the parameters to be compared with. For example, when the control cycle of the storage battery system 1 is 10 seconds and the charging power is 2000 kW, the predetermined rate of change α = 200.

FIG. 4 is a block diagram showing an example of the configuration of the output control unit 534.
As shown in FIG. 4, the output control unit 534 includes, for example, an input value selection unit 540, an addition unit 542, a sample hold unit 541, an output restriction unit 545, an output unit 546, a multiplication unit 543, and an adjustment value setting unit 544. And has a sampling timing determination unit 547.

The input value selection unit 540 adds the control target value Pset output from the control target value output unit 533 and the value output from the multiplication unit 543 described later as the input value IN of the sample hold unit 541 described later. Output.

The sample hold unit 541 sets the value output from the input value selection unit 540 as the input value IN, samples and holds the input value IN at a predetermined cycle, and outputs the input value IN as the output value OUT. The sample hold unit 541 samples and holds the input value IN in response to an instruction from the sampling timing determination unit 547, and outputs the input value IN as an output value OUT.

The sampling timing determination unit 547 is a functional unit that determines the sampling timing of the input value IN by the sample hold unit 541. Specifically, the sampling timing determination unit 547 instructs the sample hold unit 541 to sample the input value IN every predetermined time ΔT.

For example, the sampling timing determination unit 547 outputs a sampling signal (pulse) Ss having a constant period ΔT to determine the sampling timing of the input value IN by the sample hold unit 541. For example, the sample hold unit 541 samples the input value IN according to the rising edge of the sampling signal (pulse) Ss output from the sampling timing determination unit 547 and outputs it as the output value OUT, and outputs the next sampling signal (pulse). ) The output value OUT is held regardless of the input value IN until the rising edge of Ss is detected.

Here, the predetermined time ΔT is one of the parameters that defines the rate of change ΔP / ΔT of the received power target value Psetx, and is the sampling cycle of the sample hold unit 541, that is, the cycle in which the received power target value Psetx is updated. This is the specified value. For example, the predetermined time ΔT (hereinafter, also referred to as “sampling cycle ΔT”) can be arbitrarily set in advance by a user or the like.

The output limiting unit 545 is a so-called limiter. The output limiting unit 545 inputs the output value OUT output from the sample hold unit 541, and when the input output value OUT is a positive value, the output limiting unit 545 outputs the input output value OUT as it is and outputs it. When the value OUT is a negative value, the output value OUT is output as “0”.

The output unit 546 outputs a value obtained by multiplying the value output from the output limiting unit 545 by "-1" as the received power target value Psetx.

The addition unit 542 subtracts the adjustment value ΔP set by the adjustment value setting unit 544 from the output value OUT output from the sample hold unit 541 and outputs the output value.

Here, the adjustment value ΔP is one of the parameters for defining the rate of change ΔP / ΔT of the power receiving power target value Psetx, and is the amount of change in the power receiving power target value Psetx per predetermined time (sampling period) ΔT. .. The adjustment value ΔP can be arbitrarily set in advance by, for example, a user or the like. The adjustment value setting unit 544 inputs a preset adjustment value ΔP to the addition unit 542.

The multiplication unit 543 outputs a value obtained by multiplying the inversion signal of the DR activation command signal X (= “1” or “0”) and the output value (OUT−ΔP) of the addition unit 542. For example, when the DR activation command signal X is a value (X = 0) indicating to stop the activation of the DR, the multiplication unit 543 outputs the output value (OUT-ΔP) of the addition unit 542 as it is, and outputs the DR activation command as it is. When the signal X is a value (X = 1) indicating the activation of DR, the output value (OUT-ΔP) of the addition unit 542 is output as “0”.

Next, the operation of the output control unit 534 will be described.
FIG. 5 is a timing chart showing an example of the operation of the output control unit 534.
In FIG. 5, in order from the top, the sampling signal Ss, the DR activation command signal X, the input value IN of the sample hold unit 541, the output value OUT of the sample hold unit 541, and the received power target value Psetx are shown.

As shown in FIG. 5, at time t0, it is assumed that the DR activation command signal X is a value (X = 1) instructing the activation of DR, and the control target value Pset = P0. Further, it is assumed that P0> P1> P2> P3> P4 (= 0)> P5.

In this case, at the sampling timing at time t1, X = 1 and the control target value Pset = P0, as at time t0. Therefore, the input value selection unit 540 is subjected to the control target value output unit 533 to control target value Pset =. P0 is input, and 0 (= (OUT−ΔP) × 0) is input from the multiplication unit 543. As a result, Pset = P0 is input to the sample hold unit 541 as the input value IN.

The sample hold unit 541 samples the input value IN = P0 according to the sampling signal Ss, outputs the output value OUT = P0, and holds the value. Since the output value OUT (= P0)> 0, the output limiting unit 545 outputs the output value OUT (= P0) as it is. The output unit 546 outputs a value (−P0) obtained by multiplying the output value OUT (= P0) output from the output limiting unit 545 by “-1” as the received power target value Psetx.

Next, at time t2, it is assumed that the DR activation command signal X is switched from the value instructing the activation of the DR (X = 1) to the value instructing the stop of the DR (X = 0). At this time, 0 is input from the control target value output unit 533 to the input value selection unit 540, and (P0-ΔP) is input from the multiplication unit 543. As a result, the input value IN of the sample hold unit 541 is switched from P0 to P1 (= P0-ΔP). However, at this time, since the sampling signal Ss is not input to the sample hold unit 541, the output value OUT is not updated and is “P0”.

After that, when the sampling signal Ss is input at time t3, the sample hold unit 541 samples the input value IN = (P0-ΔP) and switches the output value OUT from P0 to P1 = (P0-ΔP). And hold.

Since the output value OUT (= P1)> 0, the output limiting unit 545 outputs the output value OUT (= P1) as it is. The output unit 546 outputs a value (-P1 =-(P0-ΔP)) obtained by multiplying the output value OUT (= P1) output from the output limiting unit 545 by "-1" as the received power target value Psetx. ..

Further, when the output value OUT is switched from P0 to P1 (= P0-ΔP) at time t3, the addition unit 542 outputs P2 (= P0-2ΔP). As a result, the input value IN of the sample hold unit 541 is switched from P1 to P2 (= P0-2ΔP).

After that, at times t4 and t5 as well as at time t3, every time the sampling signal Ss is input, the sample hold unit 541 samples the input value IN and updates the output value OUT. As a result, the received power target value Psetx increases by ΔP for each sampling cycle ΔT, and the received power target value Psetx = −P4 = 0 at time t6.

As described above, according to the output control unit 534 having the configuration shown in FIG. 4, when the power adjustment process corresponding to the positive watt command is executed (when the DR activation command signal X = 1), the received power target value is obtained. Psetx (= -Pset) is the value obtained by multiplying the control target value Pset by "-1", and when the execution of the power adjustment process according to the positive watt command is stopped (DR activation command signal X is from "1" to "0". (When switched to), the received power target value Psetx changes to “0” at a constant rate of change ΔP / ΔT.

Here, the rate of change ΔP / ΔT of the power receiving power target value Psetx is set to be smaller than the predetermined rate of change α determined by the specifications of the storage battery system 1 described above. The rate of change ΔP / ΔT can be set to an appropriate value by adjusting the values of the sampling period ΔT and the amount of change (adjustment value) ΔP of the received power target value Psetx.

Next, the operation of the positive watt trading device 100 according to the present embodiment will be described with reference to the drawings.

FIG. 6 is a timing chart showing changes in each electric power before and after the activation of DR in the positive watt trading apparatus 100 according to the first embodiment. 7A to 7E are diagrams showing each electric power of the positive watt trading device 100 at a predetermined time in FIG.

In FIG. 6, the horizontal axis represents time and the vertical axis represents electric power [MW]. Further, in FIG. 6, the reference reference numeral 600 represents the baseline P0, the reference reference numeral 601 represents the actual received power PjA, the reference reference numeral 602 represents the received power target value Psetx, and the reference reference numeral 603 represents the maximum power receiving point during charging. It represents Pcmax, and reference numeral 604 represents the electric power (charging power) Pc of the storage battery 11. In FIG. 6, for convenience of illustration, the sign of the electric power (charging power) Pc when the storage battery 11 is charged is set to “positive (+)”.

FIG. 7A shows a numerical example of each electric power of the positive watt trading apparatus 100 at time t0 of FIG. 6, and FIG. 7B shows a numerical example of each electric power of the positive watt trading apparatus 100 at time t1 of FIG. FIG. 7C shows a numerical example of each electric power of the positive watt trading apparatus 100 at time t2 of FIG. 6, and FIG. 7D shows a numerical example of each electric power of the positive watt trading apparatus 100 at time t3 of FIG. FIG. 7E shows a numerical example of each electric power of the positive watt trading apparatus 100 at time t4 of FIG.

In the positive wattage trading apparatus 100 shown in FIGS. 7A to 7E, it is assumed that the operation mode of the storage battery system 1 is the charging mode, the maximum power receiving point at the time of charging is Pcmax = 5000 kW, and the charged power set value Pcst = -3000 kW. Further, it is assumed that the power of the load 2 is set to 3500 kW before and after the DR is activated, the actual received power PjA is set to 3500 kW, and the baseline P0 is set to 3500 kW, which is the same as the actual received power PjA.

Further, at a time before the time t0 in FIG. 6, the positive watt transaction support device 5 receives a DR command (positive watt command) instructing that the received power is increased by 2000 kW during the period from the time t1 to the time t3. It is assumed that the DR start time t1 and the DR end time t3 are set in the schedule management unit 52, and the target reduction amount Pt = −2000 kW is set in the received power target value determination unit 53.

As shown in FIGS. 6 and 7A, for example, at the time t0 before the DR is activated, the schedule management unit 52 outputs the DR activation command signal X as “0”. As a result, the received power target value determining unit 53 outputs the received power target value Psetx = 0 as described above.

The virtual power receiving power calculation unit 59 is output from the charging power receiving point maximum power value Pcmax (= 5000kW), the actual power receiving power PjA (= 3500kW), and the power receiving power target value determining unit 53 output from the positive watt setting unit 57. The value obtained by adding the received power target value Psetx (= 0) is input to the control device 10 of the storage battery system 1 as the virtual received power PjB (= PjA + Pcmax + Psetx = 8500 kW).

In the storage battery system 1, at time t0, the storage battery 11 is not charging, so the charging power Pc = 0 kW. Therefore, the load power calculation unit 13 outputs the same value as the virtual received power PjB (= PjA + Pcmax = 8500 kW) as the load power PLB (= 8500 kW) of the load 2. The charging power adjustment value calculation unit 151 subtracts the maximum power receiving point Pcmax (= 5000kW) during charging from the load power PLB value (8500 kW) calculated by the load power calculation unit 13 to obtain the charging power adjustment value Pca (= 5000 kW). = 3500 kW) is calculated and given to the output limiting unit 152. Since the charging power adjustment value Pca (= 3500 kW) is a positive value, the output limiting unit 152 outputs the charging power adjustment value Pca to the maximum value selection unit 153 as “0”.

Since the charging power adjustment value Pca (= 0 kW) output from the output limiting unit 152 is larger than the charging power set value Pcst (= -3000 kW), the maximum value selection unit 153 sets the charging power adjustment value Pca (= 0 kW). It is selected and input to the mode switching unit 16.

As described above, since the operation mode of the storage battery system 1 is the charging mode, the mode switching unit 16 transmits the charging power adjustment value Pca (= 0 kW) input from the maximum value selection unit 153 to the power adjustment value output unit 17. Upon input, the power adjustment value output unit 17 outputs the charging power adjustment value Pca (= 0 kW) to the power conversion unit 12. As a result, charging of the storage battery 11 is not started at time t0.

Next, consider the case where the time reaches the DR start time t1. At this time, as shown in FIGS. 6 and 7B, the DR activation command signal X is switched from “0” to “1” by the schedule management unit 52. As a result, the received power target value determination unit 53 sets the received power target value Psetx (= P0-Pt = 3500 kW- (-2000 kW) = 5500 kW) multiplied by "-1" (-5500 kW). Output as the value Psetx.

The virtual power receiving power calculation unit 59 is output from the charging power receiving point maximum power value Pcmax (= 5000kW), the actual power receiving power PjA (= 3500kW), and the power receiving power target value determining unit 53 output from the positive watt setting unit 57. The value obtained by adding the received power target value Psetx (= −5500 kW) is input to the control device 10 of the storage battery system 1 as the virtual power received power PjB (= PjA + Pcmax + Psetx = 3000 kW).

That is, the positive watt transaction support device 5 uses the storage battery system 1 to adjust the virtual power received power PjB (= 3000 kW) corrected so that the power received at the power receiving point looks smaller than the actual power received power PjA (= 3500 kW) in response to the activation of DR. Enter in.

In the storage battery system 1, at time t1, the charging power Pc = 0 kW, so that the load power calculation unit 13 sets the same value as the virtual power received power PjB given by the positive watt transaction support device 5 to the load power PLB of the load 2 ( = 3000 kW) is output.

The charging power adjustment value calculation unit 151 subtracts the maximum power receiving point Pcmax (= 5000kW) at the time of charging from the load power PLB value (3000 kW) calculated by the load power calculation unit 13 to obtain the charging power adjustment value Pca (= 5000 kW). = -2000k) is calculated. Since the charge power adjustment value Pca (= -2000 kW) is a negative value in the output limiting unit 152, the charge power adjustment value Pca (= -2000 kW) calculated by the charge power adjustment value calculation unit 151 is selected as it is as the maximum value. Input to unit 153.

At this time, since the charging power adjustment value Pca (= -2000 kW) is larger than the charging power set value Pcst (= -3000 kW), the maximum value selection unit 153 selects the charging power adjustment value Pca (= -2000 kW). Input to the mode switching unit 16. The mode switching unit 16 and the power adjustment value output unit 17 output the input charge power adjustment value Pca (= −2000 kW) to the power conversion unit 12.

The power conversion unit 12 starts charging the storage battery 11 so that the charging power Pc of the storage battery 11 matches the charging power adjustment value Pca (= −2000 kW). As a result, the charging power Pc of the storage battery 11 quickly becomes −2000 kW.

After time t1, the power conversion unit 12 controls the charging of the storage battery 11 so that the charging power Pc of the storage battery 11 matches the charging power adjustment value Pca (= −2000 kW). For example, at time t2 when the charging power Pc coincides with the charging power adjustment value Pca (= −2000 kW), as shown in FIG. 7C, the actual received power PjA at the receiving point is the actual power of the load 2 (= 3500 kW). It is the sum (= 5500 kW) of the charging power to the storage battery 11 | Pc | (= 2000 kW). As a result, the virtual received power PjB calculated by the virtual received power calculation unit 59 becomes 5000 kW (= PjA + Pcmax + Pset = 5500 kW + 5000 kW-5500 kW).

As shown in FIGS. 6 and 7C, at time t2, the charging power Pc = −2000 kW in the storage battery system, so that the load power calculation unit 13 adds the charged power Pc (= −2000 kW) to the virtual received power PjB (= 5000 kW). ) Is added, and the value (= 3000 kW) is output as the load power PLB of the load 2. The charging power adjustment value calculation unit 151 subtracts the maximum power receiving point Pcmax (= 5000kW) at the time of charging from the load power PLB value (3000 kW) calculated by the load power calculation unit 13 to obtain the charging power adjustment value Pca (= 5000 kW). = -2000 kW) is calculated.

Since the input charging power adjustment value Pca (= -2000 kW) is a negative value, the output limiting unit 152 outputs the input charging power adjustment value Pca (= -2000 kW) to the maximum value selection unit 153 as it is. .. The maximum value selection unit 153 selects the charging power adjustment value Pca (= -2000kW> -3000kW), and the mode switching unit 16 and the power adjustment value output unit 17 convert the charging power adjustment value Pca (= -2000kW) into power. Output to unit 12.

In this way, in the DR activation period, the virtual power is corrected so as to be smaller than the maximum power value Pcmax (= 5000 kW) at the time of charging by the target increase amount of power (= PjA + Psetx = 3500-5500 = 2000 kW). Since the received power PjB (= 3000 kW) is input to the storage battery system 1, the storage battery 11 is charged with the charging power Pc = −2000 kW. As a result, during the DR activation period, the actual received power PjA at the receiving point becomes 5500 kW, which is 2000 kW larger than the actual power of load 2 (baseline P0), and the target reduction amount (= -2000 kW) based on the positive watt command is realized. can do.

Next, as shown in FIG. 6, consider the case where the time reaches the DR end time t3. At this time, as shown in FIG. 7D, the DR activation command signal X is switched from “1” to “0” by the schedule management unit 52. As a result, as described above, the received power target value determination unit 53 steps the control target value Pset immediately before the DR activation command signal X is switched from “1” to “0” by the adjustment value ΔP for each sampling cycle ΔT. By changing to, the received power target value Psetx is generated (see FIG. 5). That is, as shown in FIG. 6, the received power target value Psetx gradually increases at the rate of change ΔP / ΔT after the time t3 when the DR activation command signal X is switched from “1” to “0”, and at time t5. It becomes "0".

As a result, as shown in FIG. 6, during the period from the time t3 to the time t4 when the target value Psetx of the received power reaches -3500 kW, the charging power Pc and the actual received power PjA of the storage battery gradually change, and at the time t4. Charging of the storage battery 11 is stopped (Pc = 0 kW). Then, at the time t5 when the target value Psetx of the received power reaches 0 kW, the values of the virtual received power PjB and the actual received power PjA return to the state before the start of DR (time t0) as shown in FIG. 7E.

As described above, the positive watt transaction support device 5 according to the present embodiment is made smaller than the value of the received power (actual received power PjA) in response to the demand response command (DR command) requesting an increase in the power used in the positive watt transaction. The value of the virtual received power PjB corrected to is calculated and input to the control device 10 of the storage battery system 1 in place of the value of the received power.

Specifically, as described above, the positive watt transaction support device 5 receives power with respect to the maximum power value Pcmax at the time of charging, which is the upper limit of the power receiving point power when charging the storage battery 11 in the storage battery system 1. The difference between the actual received power PjA and the control target value Pset according to the positive watt command, that is, the sum of the actual received power PjA at the receiving point and the received power target value Psetx (corresponding to the target increase in power based on the positive watt command). The added value is input to the storage battery system 1 as the virtual received power PjB.

According to this, in the storage battery system 1, during the DR activation period, the difference between the actual received power PjA at the receiving point and the control target value Pset according to the positive watt command, that is, the amount of the target increase in power based on the positive watt command, Since it operates to charge the storage battery 11, it is possible to increase the received power by the amount specified by the DR command.

Further, the positive watt transaction support device 5 changes the received power target value Psetx from the first value (for example, -P0 in FIG. 5) to a second value (for example, -P4 in FIG. 5) larger than the first value. When changing, the rate of change (ΔP / Δt) of the received power target value Psetx determines the magnitude relationship between the predetermined rate of change (for example, the maximum value selection unit 153) between the charging power adjustment value Pca and the charging power set value Pcst. The rate of change determined based on the cycle) is set to be less than or equal to.

According to this, when the charging of the storage battery based on the positive watt command is stopped, the DR ends from the time when the received power target value Psetx changes, that is, the value of the received power target value Psetx (first value) at the time of DR execution. It is possible to make the time for changing to the current power received power target value Psetx (second value) longer than the control cycle of the storage battery system 1.
According to this, the storage battery system 1 controls the charging power of the storage battery according to the change of the received power target value Psetx without synchronizing the control cycle (control timing) of the storage battery system 1 and the control cycle of the positive watt transaction support device 5. Since the amount can be updated appropriately, it is possible to prevent malfunction of the storage battery system.

For example, the above-mentioned event, that is, the control input value (charging power adjustment value Pca) as an input signal of the maximum value selection unit 153 drops sharply, and the control input value (charging power adjustment value Pca) and the planned operation value (charging power adjustment value Pca) Even though the magnitude relationship with the charging power set value Pcst has been switched, the value to be selected by the maximum value selection unit 153 is from the control input value (charging power adjustment value Pca) to the planned operation value (charging power setting value Pcst). It is possible to prevent an event in which the storage battery system 1 malfunctions due to continuous selection of a control input value (charging power adjustment value Pca) that has dropped sharply without switching to.

Further, when the positive watt transaction support device 5 according to the present embodiment changes the received power target value Psetx from the first value to the second value, as shown in FIG. 5, the received power target value Psetx is set to the first value. From the value of to the second value, the value is changed stepwise every predetermined time ΔT.

According to this, it becomes easy to set the rate of change (ΔP / ΔT) of the received power target value Psetx to a desired value. For example, when the received power target value Psetx is changed by ΔP for each predetermined time ΔT, the rate of change (ΔP / ΔT) of the received power target value Psetx is equal to or less than the predetermined rate of change by adjusting the values of ΔT and ΔP. It becomes easy to set to.

The inventions made by the present inventors have been specifically described above based on the embodiments, but it goes without saying that the present invention is not limited thereto and can be variously modified without departing from the gist thereof. No.

For example, in the above embodiment, the case where the value of the baseline P0 is calculated in the positive watt transaction support device 5 (baseline calculation unit 54) is illustrated, but the present invention is not limited to this. For example, the value of the baseline P0 may be managed for each customer by a higher-level device such as a resource aggregator, transmitted from the higher-level device to the positive watt transaction support device 5, and set in the positive watt transaction support device 5.

Further, in the above embodiment, the case where the target reduction amount Pt is received as the DR command is illustrated, but the control target value Pset may be received as the DR command. In this case, the power receiving power target value determination unit 53 does not need the control target value calculation unit 530, and may input the received control target value Pset to the control target value output unit 533.

Further, in the above embodiment, a case where the received power target value Psetx is changed stepwise at predetermined time intervals when the power adjustment process based on the DR command is stopped (when switching from X = 1 to X = 0) will be described. However, it is not limited to this. For example, even when the received power target value Psetx is changed while DR is being activated (X = 1), the received power target value Psetx may be changed stepwise at predetermined time intervals. According to this, even when the target reduction amount Pt changes while the DR is activated, the storage battery system 1 is less likely to malfunction.

1 ... Storage battery system, 2 ... Load, 5 ... Posiwatt transaction support device, 10 ... Control device, 11 ... Storage battery, 12 ... Power conversion unit, 13 ... Load power calculation unit, 14 ... Discharge control unit, 15 ... Charge control unit, 16 ... Mode switching unit, 17 ... Power adjustment value output unit, 51 ... DR command receiving unit, 52 ... Schedule management unit, 53 ... Power received power target value determination unit, 54 ... Baseline calculation unit, 57 ... Positive watt setting unit, 59 ... Virtual power receiving power calculation unit, 100 ... Positive watt trading device, 150 ... Power receiving point maximum power setting unit during charging, 151 ... Charging power adjustment value calculation unit, 152 ... Output limiting unit, 153 ... Maximum value selection unit 510 ... DR activation Time data, 511 ... Target reduction amount Pt data, 530 ... Control target value calculation unit, 533 ... Control target value output unit, 534 ... Output control unit, 540 ... Input value selection unit, 541 ... Sample hold unit, 542 ... Addition unit, 543 ... Multiplying unit, 544 ... Adjustment value setting unit, 545 ... Output limiting unit, 546 ... Output unit, 547 ... Sampling timing determination unit, SWc, SWd ... Switch unit, IN ... Input value, OUT ... Output value , P0 ... Baseline, Pc ... Power (charging power), Pca ... Charging power adjustment value, Pcmax ... Charging power receiving point maximum power value, Pcst ... Charging power setting value, Pda ... Discharge power adjustment value, PjA ... Actual power received power , PjB ... Virtual power received, PLB ... Load power, Pset ... Control target value, Psetx ... Power received power target value, Pt ... Target reduction amount, Sm ... Mode designation signal, Ss ... Sampling signal, ΔP ... Adjustment value (change amount) , ΔP / ΔT ... predetermined rate of change, ΔT ... predetermined time (sampling cycle).

Claims (4)

For a load that receives power from the outside via the power receiving point, a storage battery that can supply power separately from the power from the outside and the value of the power received at the power receiving point are input, and the value of the received power is input. Connected to a storage battery system including a control device that controls the discharge power of the storage battery based on the above and controls the charging power from the power receiving point to the storage battery so that the value of the received power does not exceed a predetermined threshold value. A possible positive watt transaction support device,
The value of the virtual received power is calculated based on the target value of the received power calculated in response to the demand response command requesting an increase in the power used in the positive watt transaction, the value of the received power, and the predetermined threshold value. Input to the control device instead of the value of the received power,
When the target value of the received power is changed from the first value to the second value larger than the first value, the change rate of the target value of the received power is equal to or less than a predetermined change rate. A positive watt transaction support device that changes the target value of the received power. In the positive watt transaction support device according to claim 1,
When the target value of the received power is changed from the first value to the second value, the target value of the received power is changed stepwise from the first value to the second value at predetermined time intervals. A positive watt trading support device characterized by changing. In the positive watt transaction support device according to claim 2.
In response to a demand response command requesting an increase in power consumption in positive watt trading, a power receiving power target value determining unit that determines the target value of the received power,
In response to the demand response command, the sum of the value of the received power and the target value of the received power is added to the predetermined threshold value to calculate the value of the virtual received power, and the virtual power received is input to the control device. Power calculation unit and
It has a schedule management unit that instructs the execution and stop of the power adjustment process according to the demand response command.
When the schedule management unit instructs the stop of the power adjustment process, the received power target value determining unit sets the target value of the received power stepwise at predetermined time intervals from the value set immediately before. A positive watt trading support device characterized by changing to zero. For a load that receives power from the outside via the power receiving point, a storage battery that can supply power separately from the power from the outside and the value of the power received at the power receiving point are input, and the value of the received power is input. A storage battery system including a control device for controlling the discharge power of the storage battery based on the above and controlling the charging power from the power receiving point to the storage battery so that the value of the received power does not exceed a predetermined threshold is used. It is a positive watt transaction support method that supports the positive watt transaction that was there.
The first step of receiving a demand response command requesting an increase in power consumption in positive watt trading, and
The value of the virtual received power is calculated based on the target value of the received power calculated in response to the demand response command, the value of the received power, and the predetermined threshold value, and the value of the virtual received power is calculated in place of the value of the received power. The second step to input to the control device and
When the target value of the received power is changed from the first value to the second value larger than the first value, the change rate of the target value of the received power is equal to or less than a predetermined change rate. A positive watt transaction support method that includes a third step of changing the target value of the received power.

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