JP2021052543A - Negawatt trading support device and negawatt trading method - Google Patents

Abstract

To realize negawatt trading while preventing malfunction of a power storage battery system when the negawatt trading is conducted using an existing power storage battery system.SOLUTION: A negawatt trading support device (3) that can be connected to a power storage battery system (1) calculates a bias value of receiving power on the basis of a target value of the receiving power acquired in response to a demand response command requesting the reduction of power in negawatt trading and a predetermined threshold value, calculates the value of a virtual receiving power from the bias value of the receiving power and the value of the receiving power, inputs the calculated virtual receiving power to the control device (10) as a control reference value instead of the value of the receiving power, and changes the bias value of the receiving power such that a change rate of the bias value of the receiving power is equal to or less than a predetermined change rate when the bias value of the receiving power is changed from a first value to a second value smaller than the first value.SELECTED DRAWING: Figure 1

Description

The present invention relates to a negawatt trading support device and a negawatt trading method, and more particularly to a negawatt trading support device and a negawatt trading method for realizing a virtual power plant.

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, a power network using a virtual power plant (VPP) has been attracting attention as an alternative power network to the conventional power network. 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, technology for negawatt trading, which is one of the distributed energy resources of virtual power plants, is expected to spread as an elemental technology of virtual power plants.

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, negawatt trading refers to trading of the amount of power demand reduction in response to requests from power transmission and distribution business operators, resource aggregators, and the like.

On the other hand, among the consumers, there are consumers who have a power receiving power adjustment facility that adjusts the power received so that the power received is equal to or less than the contracted power threshold (hereinafter, also referred to as "power receiving power adjustment consumer"). .. The power receiving power adjustment equipment uses regular power generation equipment such as storage battery systems and private power generation equipment and a demand controller, and when the load of the power receiving power adjustment consumer increases, the power is transferred from the regular power generation equipment to the load of the power receiving power adjustment consumer. It is a facility that supplies and adjusts the received power to the power below the contract power threshold.

In equipment using a demand controller, when the load of the received power adjustment consumer increases, the demand controller selectively cuts off the load in the received power adjustment consumer so that the received power becomes less than the contracted power threshold. There is.

For example, a power receiving power adjustment consumer who has a storage battery system as a power receiving power adjustment facility automatically adjusts the charge / discharge power of the storage battery system according to the power received for the purpose of cutting the peak of the power received.

JP-A-2018-160949

Such a received power adjustment facility is usually autonomously controlled, and is not configured to accept an external control command. Therefore, in order to use the existing power receiving power adjustment equipment for negawatt trading, it is necessary to modify or replace the control device so that the target value of the power received can be changed from the outside via the communication means.

However, when modifying a control device such as a PCS, it is expected that a large amount of cost will be required because the modification specifications differ depending on the manufacturer and device, and in the case of a device manufactured with standard specifications, it is treated as a non-standard product. There is concern that it will become a device.

Therefore, in recent years, research has been conducted on a negawatt trading support device that realizes negawatt trading without modifying or replacing the existing power receiving power adjusting equipment of such a receiving power adjusting consumer.

For example, in Patent Document 1, the received power at the receiving point (hereinafter, also referred to as “power receiving point”) is monitored, and the storage battery is discharged so that the receiving point power does not exceed a predetermined threshold (load tracking threshold). In a storage battery system equipped with a load tracking function that supplies power to a load, a negative watt trading support device that realizes negative watt trading by adjusting the apparent value of the received power and inputting it into the storage battery system is disclosed. ..

This negawatt transaction support device is a storage battery system that adds a value corresponding to the amount of reduction in the received power included in the command (demand response command) that instructs the demand response that triggers the negawatt transaction to the actual received power. Enter in. The power storage system discharges the storage battery and supplies power to the load so that the virtual received power does not exceed the load tracking threshold. This makes it possible to reduce the received power in response to the demand response command.

Prior to the present application, the inventors of the present application provide a negawatt trading support device in front of a storage battery system having a load tracking function, and when trying to realize negawatt trading, the storage battery system malfunctions under a predetermined situation. I found it. As a result of examining such a problem, the following findings were obtained.

The negawatt trading support device attempts to realize negawatt trading 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. Since the timing at which the negawatt trading support device inputs control to the storage battery system does not match the control timing within the storage battery system, the storage battery system malfunctions as a result of being unable to respond to sudden changes in the control input value. I understood it. It is considered that this is because the storage battery system cannot cooperate with the negawatt trading 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 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 a value determined by the value of the control input from the negawatt transaction support device (control input value) and a value set for systematic charging and discharging (planning). It may be configured to select the larger of (operating value) and 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. As a result of selecting the rapidly decreasing "control input value" without switching from the "control input value" to the "planned operation value", a malfunction may occur. It can be said that this is because the control timing of the storage battery does not match the timing of the control input by the negawatt transaction support device.
For example, at the end of negawatt trading, the "control input value" for negawatt trading, which is larger than the "planned operating value", must be switched to the "planned operating value" before becoming "0". However, if the negawatt transaction ends in the middle of the control timing of the storage battery system, "0" may be output as the control amount instead of the "planned operation value". As a result, it is considered that there is a possibility of causing a malfunction that the storage battery system stops even though the operation must be continued at the "planned operation value".

The present invention has been made in view of the above problems, and an object of the present invention is to realize negawatt trading while preventing malfunction of the storage battery system when performing negawatt trading using an existing storage battery system. It is in.

In order to solve the above problems, the negative watt transaction support device according to the typical embodiment of the present invention is provided with a load that receives power from the outside via the power receiving point, separately from the power from the outside. It is provided with a storage battery capable of supplying power and a control device that receives the value of the received power at the receiving point as an input and controls the value of the output power of the storage battery so that the value of the received power does not exceed a predetermined threshold. It is a negative watt transaction support device that can be connected to the storage battery system, and the received power is based on the target value of the received power acquired in response to a demand response command requesting reduction of electric power in the negative watt transaction and the predetermined threshold value. The bias value of the above is calculated, the value of the virtual received power is calculated from the bias value of the received power and the value of the received power, and the calculated virtual received power is used as a control reference value instead of the value of the received power. When the bias value of the received power is changed from the first value to the second value smaller than the first value by inputting to the control device, the rate of change of the bias value of the received power changes by a predetermined value. It is characterized in that the bias value of the received power is changed so as to be equal to or less than the rate.

It is a figure which shows the structure of the negawatt trading apparatus which incorporated the negawatt trading support apparatus 100 which concerns on 1st Embodiment into the existing storage battery system 1. It is a figure for demonstrating the operation of the storage battery system 1. It is a figure for demonstrating the operation of the storage battery system 1. It is a figure for demonstrating the operation of the storage battery system 1. It is a figure which shows the structural example of the DR fluctuation adjustment part 40. It is a timing chart which shows an example of the calculation operation of the output value to the virtual power receiving power calculation unit 35 at the end of DR in the DR fluctuation adjustment unit 40 of the negawatt transaction support apparatus 3 which concerns on 1st Embodiment.

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 negative watt transaction support device (3) 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 (12) capable of supplying power and a value of the received power at the receiving point are input, and the value of the output power of the storage battery (12) is set so that the value of the received power does not exceed a predetermined threshold. A negative watt transaction support device (3) that can be connected to a storage battery system (1) provided with a control device (10) to control, and receives power acquired in response to a demand response command requesting reduction of electric power in negative watt transaction. The bias value of the received power is calculated based on the target value of the power and the predetermined threshold value, the value of the virtual received power is calculated from the bias value of the received power and the value of the received power, and the calculated virtual power is calculated. The received power is input to the control device (10) as a control reference value instead of the value of the received power, and the bias value of the received power is changed from the first value to a second value smaller than the first value. When changing to, the bias value of the received power is changed so that the rate of change of the bias value of the received power is equal to or less than a predetermined rate of change.

[2] In the negawatt trading support device of the above [1], when the bias value of the received power is changed from the first value to the second value smaller than the first value, the bias value of the received power is changed. The first value to the second value may be changed stepwise at predetermined time intervals.

[3] In the negative watt transaction support device of the above [2], a target value acquisition unit for acquiring a demand response target value which is a target value of received power in the demand response command based on the demand response command, and the demand response A bias value calculation unit that calculates the bias value of the received power by adding the predetermined threshold value to the target value, and a predetermined value from the bias value of the received power immediately before the end of the demand response command to zero at the end of the demand response command. An adjustment unit that calculates a DR fluctuation adjustment value that changes each time, and at the end of the demand response command, the DR fluctuation adjustment value is added to the value of the received power to calculate the virtual received power and input to the control device. It may be provided with a virtual power receiving power processing unit.

[4] In the negawatt transaction support device of the above [3], the demand response command includes a reduction amount specified value that specifies the reduction amount of the received power, and the target value acquisition unit bases the reduction amount specified value. By subtracting from, the target value of the received power may be obtained.

[5] In the negawatt transaction support device of the above [3], the demand response command includes a command value of the received power, and the target value acquisition unit acquires the command value of the received power as the target value of the received power. You may.

[6] The negative watt transaction support method according to a typical embodiment of the present invention can supply electric power separately from the external electric power to a load that receives electric power from the outside through the receiving point. A storage battery system including a storage battery and a control device that receives the value of the received power at the receiving point as an input and controls the value of the output power of the storage battery so that the value of the received power does not exceed a predetermined threshold is used. It is a negative watt transaction support method that supports the negative watt transaction, and the first step of receiving a demand response command requesting power reduction in the negative watt transaction, and the target value of the received power acquired in response to the demand response command. The bias value of the received power is calculated based on the predetermined threshold value, the value of the virtual received power is calculated from the bias value of the received power and the value of the received power, and the calculated virtual received power is used as the said. The second step of inputting to the control device as a control reference value instead of the value of the received power, and when changing the bias value of the received power from the first value to a second value smaller than the first value. It is characterized by including a third step of changing the bias value of the received power so that the rate of change of the bias value of the received power is equal to or less than a predetermined rate of change.

[7] In the negawatt trading support method of the above [6], when the bias value of the received power is changed from the first value to the second value smaller than the first value, the bias value of the received power is changed. The first value to the second value may be changed stepwise at predetermined time intervals.

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.

(First Embodiment)
FIG. 1 is a diagram showing a configuration of a negawatt trading device in which the negawatt trading support device according to the first embodiment is incorporated into an existing storage battery system.

The negawatt trading device 100 is installed on the premises of a power receiving power adjustment consumer, for example, 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. , A system that reduces the power received at the power receiving point and enables negawatt trading.

As shown in FIG. 1, the negawatt trading device 100 includes a storage battery system 1 and a negawatt trading support device 3 provided in front of the storage battery system 1 (control device 10).

The storage battery system 1 is a power receiving power adjustment facility provided with a storage battery capable of supplying power separately from the power received to the load 2 to which the power received at the power receiving point of the power receiving power adjustment consumer is supplied.

As shown in FIG. 1, the storage battery system 1 includes a control device 10, a power converter 11, and a storage battery 12. The storage battery system 1 is configured so that the output power Pg of the storage battery 12 via the power converter 11 changes according to the received power. That is, in the storage battery system 1, the control device 10 adjusts the generated power of the storage battery 12 based on the input value of the received power PjB and the value of the output power Pg of the storage battery 12, and the storage battery output power adjustment value Pga. Is determined and output to the power converter 11, and the power converter 11 outputs the output power adjusted according to the storage battery output power adjustment value Pga.

The control device 10 is a device for controlling the power converter 11 to adjust the output power of the storage battery 12. 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 load power calculation unit 13, a load tracking threshold value setting unit 14, and an output power adjustment value calculation as functional blocks for realizing a function of adjusting the output power of the storage battery 12. It has a part 15. 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 controls peripheral circuits such as input / output I / F circuits and timers. By doing so, it will be realized.

The load power calculation unit 13 calculates the load power value PLB by, for example, adding the input power received power value and the output power Pg value of the storage battery 12.

The load tracking threshold setting unit 14 sets a threshold (hereinafter, also referred to as “load tracking threshold”) Pgref (corresponding to the first threshold) for determining the output target (output power value Pg) of the storage battery system 1. To do.

As the load tracking threshold value Pgref, for example, a value according to the contracted power of the received power adjustment consumer is set. For example, the load tracking threshold value Pgref may be set to a value equal to the contracted power, but by setting the load following threshold value to a value lower than the contracted power, the storage battery system 1 can operate with a margin. The load tracking threshold value Pgref is not limited to one, and a plurality of load tracking threshold values may be set so that the threshold value based on which control is performed can be further set.

The output power adjustment value calculation unit 15 is a functional unit that calculates the output power adjustment value Pga, which is the target value of the output power of the storage battery 12, so that the load power PLB does not exceed the load tracking threshold value Pgref. The output power adjustment value calculation unit 15 calculates the output power adjustment value Pga by subtracting the load follow-up threshold value Pgref from the load power value PLB calculated by the load power calculation unit 13. The calculated output power adjustment value Pga is output from the control device 10 to the power converter 11 when it is “0” or more. When the calculated output power adjustment value Pga is less than "0", "0" is output from the control device 10 to the power converter 11.

Here, 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 an existing power receiving power adjusting facility to which the negawatt trading support device 3 is not connected.

2A to 2C are diagrams for explaining the operation of the storage battery system 1.

In the storage battery system 1 shown in FIGS. 2A to 2C, it is assumed that the load tracking threshold value Pgref = 2300 kW. Further, FIG. 2A shows a numerical example of an output power or the like when the size of the load 2 is 2000 kW, and FIG. 2B shows an output power or the like immediately after the size of the load 2 changes from 2000 kW to 2500 kW. 2C shows a numerical example of the output power and the like when the magnitude of the load 2 is 2500 kW.

As shown in FIGS. 2A to 2C, in the configuration example of the existing power receiving power adjustment equipment to which the negawatt transaction support device 3 is not connected, the value of the actual power received PjA received at the power receiving point of the power receiving power adjustment consumer is It is input to the control device 10 as the value of the received power.

As shown in FIG. 2A, when the magnitude of the load 2 is 2000 kW, which is lower than the load tracking threshold value Pgref = 2300 kW, the storage battery 12 does not output electric power. That is, since the actual received power PjA = 2000 kW at the receiving point, the load power value PLB calculated by the load power calculation unit 13 is equal to the actual received power PjA (= 2000 kW).

The output power adjustment value calculation unit 15 subtracts the load follow-up threshold Pgref (= 2300 kW) from the load power value PLB (= 2000 kW) calculated by the load power calculation unit 13, and sets the output power adjustment value Pga to minus 300 kW. Although it is calculated, since this is less than "0", "0" is input to the power converter 11 as the output power adjustment value Pga. In this case, only the power from the outside (system) is input to the load 2. The output power adjustment value calculation unit 15 has a limiter function, and when the value obtained by subtracting the load tracking threshold Pgref from the load power value PLB is less than "0", it is corrected to "0" and output. It is output as the power adjustment value Pga.

Next, consider the case where the magnitude of the load 2 changes from 2000 kW to 2500 kW. Immediately after the change, as shown in FIG. 2B, since the storage battery 12 has not yet output power, the actual received power PjA at the receiving point changes to 2500 kW, which is equal to the value of the load 2. Further, the load power value PLB calculated by the load power calculation unit 13 is a value (= 2500 kW) equal to the actual received power PjA because the storage battery 12 has not yet output the power.

The output power adjustment value calculation unit 15 subtracts the load follow-up threshold Pgref (= 2300 kW) from the load power value PLB (= 2500 kW) calculated by the load power calculation unit 13 to obtain the output power adjustment value Pga (= 200 kW). Is calculated and input to the power converter 11.

As a result, at the next control timing, 200 kW of power is supplied from the storage battery 12 to the load 2, and as shown in FIG. 2C, the actual received power PjA at the receiving point is the initial value (in the case of FIG. 2B). The value (2300 kW) is smaller than that of (2500 kW) by the output power (200 kW) of the storage battery 12. That is, the actual received power PjA (= 2300 kW) at the power receiving point becomes equal to the load tracking threshold Pgref (= 2300 kW). In this case as well, the load power value PLB calculated by the load power calculation unit 13 is the value (= 2500 kW) obtained by adding the output power (200 kW) of the storage battery to the actual power received power PjA (= 2300 kW).

Similar to FIG. 2B, the output power adjustment value calculation unit 15 subtracts the load follow-up threshold Pgref (= 2300 kW) from the load power value PLB (= 2500 kW) calculated by the load power calculation unit 13 to adjust the output power. The value Pga (= 200 kW) is calculated and input to the power converter 11. After that, the control device 10 adjusts the output power of the storage battery 12 so that the actual received power PjA (= 2300 kW) does not exceed the load tracking threshold value Pgref (= 2300 kW).

As described above, the control device 10 of the storage battery system 1 outputs the power of the storage battery 12 when the load value exceeds the load tracking threshold Pgref, and after the power output from the storage battery 12, the power of the receiving point is loaded. The output power supplied from the storage battery 12 to the load 2 is controlled so as not to exceed the tracking threshold Pgref. That is, the control device 10 receives the received power as an input and controls the output power of the storage battery 12 so that the total value (load power PLB) of the received power and the output power of the storage battery 12 converges to the load tracking threshold Pgref. It constitutes a feedback system for PI control.

Next, the negawatt trading support device 3 will be described.

The negawatt transaction support device 3 replaces the target value of the feedback system in the existing storage battery system 1 described above with a new target value specified by the DR command value (value specified by the demand response) that triggers the negawatt transaction. As a value, it is a device that controls the storage battery system 1.

The negawatt trading support device 3 of the present embodiment further changes the bias value of the received power from the first value to the second value smaller than the first value in order to prevent the above-mentioned malfunction of the storage battery system 1. At that time, the bias value of the received power is changed so that the rate of change of the bias value of the received power is equal to or less than the predetermined rate of change.

Specifically, when the negawatt trading support device 3 changes the bias value of the received power from the first value to the second value, the bias 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, in the negawatt trading support device 3, the bias value of the received power immediately before the end of the power adjustment process (DR) based on the demand response command is P1, and the target value of the bias value of the received power after the end of DR is P2. When (<P1), the bias value of the received power is changed stepwise (stepwise) from P1 to P2 by ΔP (≦ (P1-P2)) at predetermined time Δt intervals.

The negative watt transaction support device 3 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 negawatt transaction support device 3 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.

As shown in FIG. 1, the negawatt trading support device 3 includes a DR command receiving unit 31 and a received power target value calculating unit 32 as functional blocks for realizing a function of supporting negawatt trading using the storage battery system 1. , Bias value calculation unit 33, DR activation command unit 34, virtual power receiving power calculation unit 35, schedule management unit 36, baseline calculation unit 37, and load tracking threshold input unit 38. ..

Further, in the negawatt trading support device 3 of the present embodiment, when the bias value of the received power is changed from the first value to the second value smaller than the first value, the rate of change of the bias value of the received power is predetermined. As a functional block that changes the bias value of the received power so as to be equal to or less than the rate of change of, the DR fluctuation adjusting unit 40 is provided.

In these functional blocks of the negative watt transaction support device 3, 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 the input / output I / F circuit, timer, etc. It is realized by controlling the peripheral circuit of the above and the communication circuit.

The DR command receiving unit 31 of the negawatt trading support device 3 receives a DR command from a higher-level device such as a resource aggregator.

The DR command includes, for example, DR activation time data (hereinafter, also referred to as "DR activation time information") and a target value of the power reduction amount by the DR command (hereinafter, also referred to as "target reduction amount"). Data Pt and are included. For example, in the DR activation time data, as information for specifying the period for activating the DR, information for specifying the time for activating the DR command (DR activation time) and information for specifying the time for stopping the activation of the DR command are included. (DR stop time) and is included.

The baseline calculation unit 37 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. For example, the baseline P0 is the value of the load 2 at a predetermined time or the average value of the received power over the past several days for the consumer. For example, the average value of the load 2 values specified every 30 minutes in the past 5 days can be used as the baseline P0 value in the DR activation period. When DR is activated, it is preferable that the value of the load 2 on the day of the consumer and the baseline P0 are close to each other.

The received power target value calculation unit 32 determines the received power target value Pset based on the target reduction amount Pt received by the DR command receiving unit 31 and the baseline P0. This received power target value Pset becomes a new target value for realizing negawatt trading using the storage battery system 1.

The received power target value Pset is a target value of the received power when the received power at the receiving point is reduced in response to the DR command. The received power target value calculation unit 32 calculates the received power target value Pset (= P0-Pt) by subtracting the target reduction amount Pt from the baseline P0.

The load tracking threshold input unit 38 is a functional unit that outputs the load tracking threshold Pgref required for converting the feedback target value in the control device 10 of the storage battery system 1 into the received power target value Pset. The load tracking threshold value Pgref is a value that cancels the load tracking threshold value Pgref input from the load tracking threshold value setting unit 14 of the control device 10 in the storage battery system 1. Therefore, the load tracking threshold value input unit 38 is set with the same load tracking threshold value Pgref as the control device 10 of the storage battery system 1, and the load tracking threshold value input unit 38 gives the load tracking threshold value Pgref to the bias value calculation unit 33. ..

The bias value calculation unit 33 calculates the received power target bias value Pbias based on the received power specified value Pset and the load following threshold value Pgref output from the load following threshold value input unit 38.

The received power target bias value Pbias is a correction that makes the value of the received power input to the control device 10 of the storage battery system 1 appear larger than the actual received power PjA at the receiving point in order to realize the negawatt transaction using the storage battery system 1. The value.

Specifically, the bias value calculation unit 33 subtracts the received power specified value Pset from the load tracking threshold value Pgref to calculate the received power target bias value Pbias, and gives it to the DR activation command unit 34.

The schedule management unit 36 is a functional unit that controls execution (invocation of DR) and stop of power reduction processing based on the DR command. The schedule management unit 36 outputs a DR activation command signal X indicating whether or not DR can be activated based on the DR activation time information included in the DR command received by the DR command receiving unit 31.

The schedule management unit 36 has, for example, a timer that performs timekeeping, and when the DR command receiving unit 31 receives the DR command, the DR command activation time and the DR end time included in the DR activation time information are described above. Set in the timer. The schedule management unit 36 normally outputs a DR activation command signal X (= 0) instructing the stop of the power reduction process based on the DR command. When the measured time coincides with the set activation time, the schedule management unit 36 outputs a DR activation command signal X (= 1) instructing execution of the power reduction process based on the DR command. After that, when the measured time coincides with the set stop time, the DR activation command signal X (= 0) instructing the stop of the power reduction process based on the DR command is output.

The DR activation command unit 34 controls the output of the received power target bias value Pbias based on the DR activation command signal X. The DR activation command unit 34 outputs, for example, "0" when the DR activation command signal X is a value (for example, 0) instructing the stop of the power reduction process based on the DR command. On the other hand, when the DR activation command signal X is a value (for example, 1) indicating the execution of the power reduction process based on the DR command, the "power received power target bias value Pbias" calculated by the bias value calculation unit 33 is output. To do. The DR activation command unit 34 outputs these values (“received power target bias value Pbias” or “0”: hereinafter, also referred to as “received power bias value”) to the DR fluctuation adjusting unit 40.

The DR fluctuation adjusting unit 40 receives an output (received power bias value: "received power bias value" from the DR activation command unit 34 so that the change in the value (received power bias value) received from the DR activation command unit 34 does not fluctuate abruptly. The power target bias value Pbias ”or“ 0 ”) is adjusted and then output to the virtual power receiving power calculation unit 35.

Here, the DR fluctuation adjusting unit 40 will be described.
FIG. 3 is a block diagram showing an example of the configuration of the DR fluctuation adjusting unit 40.

As shown in FIG. 3, the DR fluctuation adjustment unit 40 includes, for example, an input value selection unit 41, a sampling timing determination unit 42, a sample hold unit 43, an output restriction unit 44, an adjustment value setting unit 45, an addition unit 46, and It has a multiplication unit 47.

The input value selection unit 41 sets either one of the received power target bias value Pbias output from the DR activation command unit 34 and the output value (OUT-ΔP) of the multiplication unit 47 described later to the sample hold unit 43 described later. Output as input value IN.

The sample hold unit 43 uses the value output from the input value selection unit 41 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 43 samples and holds the input value IN in response to an instruction from the sampling timing determination unit 42, and outputs the input value IN as an output value OUT.

The sampling timing determination unit 42 is a functional unit that determines the sampling timing of the input value IN by the sample hold unit 43. Specifically, the sampling timing determination unit 42 instructs the sample hold unit 43 to sample the input value IN every predetermined time ΔT. For example, the sampling timing determination unit 42 outputs a sampling signal (pulse) Ss having a constant period ΔT. For example, the sample hold unit 43 samples the input value IN according to the rising edge of the sampling signal (pulse) Ss output from the sampling timing determination unit 42, outputs it as the output value OUT, and outputs the next sampling signal (pulse). ) The output value OUT is held 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 bias value Pbias, and is the sampling cycle of the sample hold unit 43, that is, the power received output from the DR fluctuation adjusting unit 40. This is a value that defines the period in which the power target bias value Pbias is updated. 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 44 is a so-called limiter. When the output value OUT output from the sample hold unit 43 is input and the input output value OUT is a positive value, the output limiting unit 44 uses the input output value OUT as the DR fluctuation adjustment value. If the output value OUT is a negative value, "0" is output as the DR fluctuation adjustment value instead of the output value OUT.

The addition unit 46 subtracts the adjustment value ΔP from the output value OUT output from the sample hold unit 43 and outputs the output value.

The adjustment value setting unit 45 sets the adjustment value ΔP. Here, the adjustment value ΔP is one of the parameters for defining the rate of change ΔP / ΔT of the received power target bias value Pbias, and the amount of change of the received power target bias value Pbias per predetermined time (sampling cycle) ΔT. Is. The adjustment value ΔP can be arbitrarily set in advance by, for example, a user or the like. The adjustment value setting unit 45 inputs a preset adjustment value ΔP to the addition unit 46. For example, the magnitude of the value to be the control target of the storage battery output during the planned operation of the storage battery system 1 can be set as the adjustment value ΔP.

The multiplication unit 47 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 46.

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 47 outputs the output value (OUT−ΔP) of the addition unit 46 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 46 is output as “0”.

Returning to FIG. 1, the virtual received power calculation unit 35 is a functional unit that calculates the virtual received power PjB corrected for the value of the received power to be input to the control device 10 of the storage battery system 1. The virtual power reception power calculation unit 35 calculates the virtual power reception power PjB by adding the DR fluctuation adjustment value output from the DR fluctuation adjustment unit 40 to the actual power reception power PjA at the power reception point. The virtual received power PjB calculated by the virtual received power calculation unit 35 is input to the control device 10 by, for example, a current signal of 4 to 20 mA.

For example, when DR is not activated (when the DR activation command signal X = 0), “0” is output from the DR fluctuation adjusting unit 40, so that the virtual power receiving power calculation unit 35 can actually receive power PjA. The virtual received power PjB is calculated by adding "0" to the value of. That is, when the DR activation is not instructed (when the DR activation command signal X = 0), the value of the actual received power PjA is output as it is as the received power PjB, and the control device 10 (load power calculation unit 13) , The load power PLB is calculated using the actual received power PjA.

On the other hand, when DR is activated (when DR activation command signal X = 1), the DR fluctuation adjustment unit 40 outputs the “power received power target bias value Pbias” calculated based on the demand response command. Therefore, the virtual power receiving power calculation unit 35 calculates the virtual power PjB by adding the “power receiving power target bias value Pbias” to the value of the actual power receiving power PjA. That is, when DR is activated, the value obtained by raising (biasing) the value of the actual received power PjA by the "received power target bias value Pbias" is output as the received power PjB, and the control device 10 (load). The power calculation unit 13) calculates the load power PLB using the virtual power received power PjB instead of the actual power received power PjA.

Furthermore, when a sudden change in the value specified by the demand response command occurs when DR is activated, or when the state in which DR is activated is switched to the state in which DR is not activated, DR fluctuation adjustment is performed. As the value output from the unit 40 to the virtual power receiving power calculation unit 35, a DR fluctuation adjustment value adjusted so that the “power received power target bias value Pbias” calculated based on the demand response command does not fluctuate suddenly is input. There is. The virtual power receiving power calculation unit 35 calculates the virtual power PjB by adding the DR fluctuation adjustment value to the value of the actual power receiving power PjA. That is, when a sudden change in the value specified by the demand response command occurs when DR is activated, or when the state in which DR is activated is switched to the state in which DR is not activated, the actual received power is received. The value obtained by raising (biasing) the value of PjA by the DR fluctuation adjustment value is output as the received power PjB, and the control device 10 (load power calculation unit 13) uses the virtual received power PjB instead of the actual received power PjA. Use to calculate the load power PLB. The value of the virtual power received input to the storage battery system 1 changes for a moment by the DR fluctuation adjustment value due to the DR fluctuation adjustment value adjusted so as not to fluctuate suddenly, but this change is instantly compensated by the change in the storage battery output Pg. Then, the actual received power PjA changes by the amount of the change in the DR fluctuation adjustment value in an instant, and as a result, the value of the virtual received power does not change.

Next, the operation of the negawatt trading support device 3 of the present embodiment will be described. The negawatt transaction support device 3 of the present embodiment changes the value of the virtual received power input to the storage battery system 1 from the first value to the second value smaller than the first value. The virtual power received is changed so that the rate of change is equal to or less than the predetermined rate of change. For example, in the negawatt transaction support device 3 of the present embodiment, when the DR ends, the DR fluctuation adjustment unit 40 calculates the output value to the virtual power received power calculation unit 35 based on the demand response command immediately before the end of the DR. The power received power target bias value Pbias is changed stepwise at predetermined time intervals until it becomes 0.

FIG. 4 is a timing chart showing an example of the operation of calculating the output value to the virtual power receiving power calculation unit 35 at the end of DR in the DR fluctuation adjustment unit 40 of the negawatt transaction support device 3 of the present embodiment.

In FIG. 4, in order from the top, the sampling signal Ss, the DR activation command signal X, the input value IN of the sample hold unit 43, and the output value OUT of the sample hold unit 43 are shown.

As shown in FIG. 4, it is assumed that the DR activation command signal X is a value (X = 1) instructing the activation of DR at time t0, and the received power target bias value Pbias = P0. Further, it is assumed that P0> P1> P2> P3> P4> P5 and P4 = 0.

In this case, at the sampling timing at time t1, X = 1 and the received power target bias value Pbias = P0 following the time t0. Therefore, the input value selection unit 41 receives the power received power target bias value Pbias from the DR activation command unit 34. = P0 is input, and 0 (= (OUT−ΔP) × 0) is input from the multiplication unit 47. As a result, Pbias = P0 is input to the sample hold unit 43 as the input value IN.

The sample hold unit 43 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 44 outputs the output value OUT (= P0) as it is as the DR fluctuation adjustment value.

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 to the input value selection unit 41 from the DR activation command unit 34, and (P0-ΔP) is input from the multiplication unit 47. As a result, the input value IN of the sample hold unit 43 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 43, the sample hold unit 43 continues to output P0 as the output value OUT.

After that, when the sampling signal Ss is input at time t3, the sample hold unit 43 samples the input value IN = (P0-ΔP) and switches the output value OUT from P0 to (P0-ΔP). Hold that value. Since the output value OUT (= P1)> 0, the output limiting unit 44 outputs the output value OUT (= P1) as it is as the DR fluctuation adjustment value.

Further, when the output value OUT is switched from P0 to P1 (= P0-ΔP) at time t2, the addition unit 46 outputs P2 (= P0-2ΔP). As a result, the input value IN of the sample hold unit 43 is switched from P1 to P2 (= P0-2ΔP).

After that, at times t4 and t5 as well as at time t3, the sample hold unit 43 samples the input signal IN and updates the output value OUT, so that the DR fluctuation adjustment value increases by ΔP and receives power at time t6. The power target bias value Pbias = P4 = 0.

As described above, according to the DR fluctuation adjustment unit 40 having the configuration shown in FIG. 4, when the power adjustment process according to the demand response command is executed (when the DR activation command signal X = 1), the received power target bias When the value Pbias is output and the execution of the power adjustment process according to the demand response command is stopped (when the DR activation command signal X is switched from "1" to "0"), the received power target bias value Pbias is immediately set to immediately before. It is possible to output by gradually changing the received power target bias value Pbias (first value) from Pbias (first value) to "0 (second value)" by ΔP every predetermined time ΔT.

Here, as described above, by appropriately setting at least one of ΔP and ΔT, the rate of change ΔP / ΔT of the received power target bias value Pbias can be changed in the control cycle (ΔT) of the storage battery system 1. It is possible to set the rate of change (ΔP / ΔT) or less, which is determined based on the capacity (for example, the magnitude ΔP of the value to be controlled as the control target of the storage battery output during planned operation).

In this way, by providing the negawatt transaction support device 3 in front of the storage battery system 1, the control device 10 is similar to the case where the negawatt transaction support device 3 is not provided when the DR is not activated. The load power PLB is calculated using the actual power received power PjA, and when DR is activated, the load power PLB is calculated based on the virtual power received power PjB instead of the actual power received power PjA. Furthermore, when a sudden change in the value specified by the demand response command occurs when DR is activated, or when the state in which DR is activated is switched to the state in which DR is not activated, DR fluctuation adjustment is performed. The value obtained by raising (biasing) the value of the actual received power PjA by the DR fluctuation adjustment value calculated by the unit 40 is output as the received power PjB, and the control device 10 (load power calculation unit 13) outputs the actual received power. Instead of PjA, the load power PLB is calculated using the virtual power received power PjB raised by the DR fluctuation adjustment value.

As a result, the negawatt trading device 100 using the negawatt trading support device 3 of the present embodiment can realize the negawatt trading while preventing the malfunction of the storage battery system when performing the negawatt trading using the existing storage battery system. It will be possible.

(Extension of embodiment)
In the above embodiment, a configuration in which a target reduction amount Pt is received as a DR command and the received power target value calculation unit 32 determines the received power target value Pset based on the target reduction amount Pt has been described as an example. However, the negawatt trading support device 3 is not limited to this configuration. For example, the DR command receiving unit 31 may receive the received power target value Pset as a DR command and output it to the bias value calculating unit 33. In this case, the baseline calculation unit 37 and the received power target value calculation unit 32 may be omitted.

Further, the DR command receiving unit 31 can handle both the case where the target reduction amount Pt is included as the DR command and the case where the received power target value Pset is included in the negawatt transaction support device 3. Based on the content of the received DR command, the target reduction amount Pt or the received power target value Pset may be selectively input to the received power target value calculation unit 32 and the bias value calculation unit 33.

100 ... Negawatt trading device, 1 ... Storage battery system, 10 ... Control device, 11 ... Power converter, 12 ... Storage battery, 13 ... Load power calculation unit, 14 ... Load tracking threshold setting unit, 2 ... Load, 3 ... Negawatt trading support Device, 31 ... DR command receiving unit, 32 ... Power received power target value calculation unit, 33 ... Bias value calculation unit, 34 ... DR activation command unit, 35 ... Virtual power receiving power calculation unit, 36 ... Schedule management unit, 37 ... Baseline Calculation unit, 38 ... Load tracking threshold input unit, 40 ... DR fluctuation adjustment unit, 41 ... Input value selection unit, 42 ... Sampling timing determination unit, 43 ... Sample hold unit, 44 ... Output limit unit, 45 ... Adjustment value setting Part, 46 ... Addition part, 47 ... Multiplying part.

Claims (6)

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 power received. A negative watt transaction support device that can be connected to a storage battery system including a control device that controls the value of the output power of the storage battery so that
The bias value of the received power is calculated based on the target value of the received power acquired in response to the demand response command requesting the reduction of power in the negawatt transaction and the predetermined threshold value, and the bias value of the received power and the said The value of the virtual received power is calculated from the value of the received power, and the calculated virtual received power is input to the control device as a control reference value instead of the value of the received power.
When changing the bias value of the received power from the first value to a second value smaller than the first value, the rate of change of the bias value of the received power is equal to or less than a predetermined rate of change. A negawatt trading support device characterized by changing the bias value of the received power. In the negawatt trading support device according to claim 1.
When the bias value of the received power is changed from the first value to the second value smaller than the first value, the bias value of the received power is predetermined from the first value to the second value. A negawatt trading support device characterized by changing in stages over time. The negawatt trading support device according to claim 2.
Based on the demand response command, a target value acquisition unit that acquires a demand response target value that is a target value of the received power in the demand response command, and a target value acquisition unit.
A bias value calculation unit that calculates the bias value of the received power by adding the predetermined threshold value to the demand response target value, and
At the end of the demand response command, an adjustment unit that calculates a DR fluctuation adjustment value that changes from the bias value of the received power immediately before the end to zero by a predetermined value, and
It is characterized by including a virtual power receiving power processing unit that adds the DR fluctuation adjustment value to the value of the received power to calculate the virtual power received and inputs it to the control device at the end of the demand response command. Negawatt trading support device. The negawatt trading support device according to claim 3.
The demand response command includes a reduction amount specified value that specifies the reduction amount of the received power.
The target value acquisition unit is a negawatt trading support device characterized by acquiring the target value of the received power by subtracting the reduction amount designated value from the baseline. The negawatt trading support device according to claim 3.
The demand response command includes a command value of the received power.
The target value acquisition unit is a negawatt transaction support device characterized by acquiring a command value of the received power as a target value of the received power. 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 power received. Is a negative watt transaction support method for supporting negative watt transaction using a storage battery system provided with a control device for controlling the value of the output power of the storage battery so that
The first step in receiving a demand response directive requesting power reduction in negawatt trading, and
The bias value of the received power is calculated based on the target value of the received power acquired in response to the demand response command and the predetermined threshold value, and the virtual power is received from the bias value of the received power and the value of the received power. The second step of calculating the value of the electric power and inputting the calculated virtual received power into the control device as a control reference value instead of the value of the received power.
When changing the bias value of the received power from the first value to a second value smaller than the first value, the rate of change of the bias value of the received power is equal to or less than a predetermined rate of change. A negawatt trading support method comprising the third step of changing the bias value of the received power.

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