JP2021158738A - Electric power transaction support device and electric power transaction method - Google Patents

Abstract

To provide an electric power transaction support device and an electric power transaction method that realize optimal electric power transaction by appropriately switching between negative watt transaction and positive watt transaction in electric power transaction using an existing power adjustment installation.SOLUTION: An electric power transaction support device (3) is characterized by including: target value acquisition units (30, 31) that acquire a target value of a storage battery (11) based on a demand response command that requests increase or decrease of power consumption in an electric power transaction; a power threshold value setting unit (32) in which a power threshold value having the same value as a discharge threshold value and a charge threshold value of the storage battery (11), which is set to the same value in advance in a power adjustment installation (1); a virtual received power calculation unit (33) that calculates a virtual received power by adding the target value of the storage battery (11) to the power threshold value; and a virtual received power output unit (35) that outputs the calculated value of the virtual received power to the control device of the power adjustment installation in place of the value of the received power at the receiving point.SELECTED DRAWING: Figure 1

Description

The present invention relates to an electric power transaction support device and an electric power transaction method.

The conventional power network generally takes the form of supplying the power generated by a large-scale power plant such as a thermal power plant or a hydropower 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 negative watts (power saving). It controls the energy resources of the above in a remote and integrated manner, and realizes the function as if it were one 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 an electric 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 conducts electric power transactions 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 transaction support device for realizing negawatt transactions using an existing storage battery system having a received power adjustment function for adjusting the received power at a receiving point to power equal to or less than a contract power threshold. ing.

The negawatt transaction 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 transactions 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 area 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 transactions, the transmission and distribution business operator has a Denmand Response Directive (hereinafter, also referred to as "Negawatt Directive") that instructs the reduction of power consumption as described above, and a Denmand Response Directive (hereinafter, also referred to as "Negawatt Directive") that instructs the increase of power consumption. Hereinafter, it is also referred to as “Posiwatt Directive”), and the consumer increases the power consumption in accordance with the Posiwatt Directive, so that the increase in the power consumption of the consumer is traded. By performing 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 referred to as "." It is equipped with a function to control the charging power of the storage battery (hereinafter, also referred to as "charging power receiving point maximum power limiting function") so as not to exceed the "charging power receiving point maximum power value" and "charging threshold"). However, it does not have a function to control the charging of the storage battery in response to an external command.

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

In this way, electric power transactions between power transmission and distribution business operators and consumers include negawatt transactions and positive watt transactions, but existing power regulation equipment such as storage battery systems can handle both negative watt transactions and positive watt transactions. It cannot be switched and executed.

The present invention has been made in view of the above problems, and an object of the present invention is to appropriately switch between negawatt transactions and positive watt transactions in electric power transactions using existing electric power adjustment equipment to realize optimum electric power transactions. To do.

The electric power transaction support device according to a typical embodiment of the present invention is an auxiliary power source capable of supplying electric power separately from the external electric power to a load that receives electric power from the outside via a receiving point. Then, the value of the received power at the receiving point is used as an input, the value of the discharged power of the auxiliary power source is controlled so that the value of the received power does not exceed a predetermined discharge threshold, and the value of the received power is predetermined. It is a power transaction support device that can be connected to a power adjustment facility equipped with a control device that controls the value of the charge power of the auxiliary power source so as not to exceed the charge threshold value of the above, and increases or decreases the power consumption in the power transaction. The same value as the discharge threshold value and the charge threshold value of the auxiliary power source set to the same value in advance in the power adjustment facility and the target value acquisition unit that acquires the target value of the auxiliary power source based on the demand response command for requesting. The power threshold setting unit in which the power threshold of the above is set, the virtual power receiving power calculation unit that calculates the virtual received power by adding the target value of the auxiliary power source to the power threshold, and the calculated value of the virtual received power. It is characterized by including a virtual power receiving power output unit that outputs power to the control device of the power adjusting facility instead of the value of the power received at the power receiving point.

According to the present invention, it is possible to switch between a negawatt transaction and a positive watt transaction in an electric power transaction using an existing electric power adjusting facility.

It is a figure which shows the configuration example of the electric power transaction apparatus which incorporated the electric power transaction support apparatus into an existing storage battery system. It is a figure which shows the configuration example of the changeover SW which exclusively switches ON / OFF of the 1st mode changeover switch SW1 and the 2nd mode changeover switch SW2. It is a timing chart in the case where the DR command includes the first DR command value which sets the value of the charging power of the storage battery 11 to 500 kW. It is a timing chart in the case where the DR command includes the first DR command value which sets the value of the discharge power of the storage battery 11 to 500 kW. This is a timing chart when the load suddenly increases from 6000 kW to 7700 kW when the storage battery 11 is controlled according to the DR command including the first DR command value of 500 kW. It is a timing chart when the DR command includes the second DR command value which specified that the received power is increased by 500kW from the baseline power. It is a timing chart when the DR command includes the second DR command value which specified that the received power is reduced by 500kW from the baseline power. It is a figure which shows the other configuration example of the electric power transaction apparatus which incorporated the electric power transaction support apparatus into an existing storage battery system.

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] In the electric power transaction support device (3) according to the typical embodiment of the present invention, the electric power from the outside is the electric power from the outside with respect to the load (2) that receives the electric power from the outside through the receiving point. Separately, the auxiliary power source (11) capable of supplying power and the value of the received power at the receiving point are input, and the auxiliary power source (11) is discharged so that the value of the received power does not exceed a predetermined discharge threshold. It is possible to connect to a power adjustment facility (1) equipped with a control device that controls the value of the electric power and controls the value of the charging power of the auxiliary power source so that the value of the received power does not exceed a predetermined charging threshold. A target value acquisition unit (30) that acquires a target value of the auxiliary power source (11) based on a demand response command that requests an increase or decrease in power consumption in electric power trading. , 31) and the power threshold setting unit (32) in which the discharge threshold and the charge threshold of the auxiliary power source (11) set to the same value in advance in the power adjustment facility (1) are set. , The virtual power receiving power calculation unit (33) that calculates the virtual power receiving power by adding the target value of the auxiliary power source (11) to the power threshold, and the value of the calculated virtual power receiving power at the power receiving point. It is characterized in that it is provided with a virtual power receiving power output unit (35) that outputs power to the control device of the power adjusting facility instead of the value of.

[2] In the power transaction support device of the above [1], the target value acquisition unit targets the auxiliary power source based on a demand response command that specifies the value of the discharge power or the value of the charge power of the auxiliary power source. The target value of the auxiliary power source is calculated based on the individual control target value calculation unit that calculates the value, the demand response command that specifies the value of the amount of increase or decrease of the received power, and the value of the received power at the power receiving point. It also has a power receiving point control target value calculation unit, and may acquire the target value of the auxiliary power source calculated by the individual control target value calculation unit or the power receiving point control target value calculation unit.

[3] In the power transaction support device of the above [1] or [2], the virtual received power output unit uses the value of the virtual received power instead of the value of the received power at the receiving point as described in the power adjusting facility. A virtual power receiving power output permitting unit that permits output to the control device may be further provided.

[4] In the power transaction support device according to any one of the above [2] or [3], the frequency deviation, which is the difference between the power supply frequency and the reference frequency at the power receiving point, is the first power value. Further provided with a frequency deviation correction unit that converts to a frequency deviation correction value, adds a predetermined offset value to the first frequency deviation correction value, and calculates a second frequency deviation correction value.
The individual control target value calculation unit may have a command value adjusting unit that subtracts the second frequency deviation correction value from the value of the discharge power or the value of the charging power included in the demand response command.

[5] In the power transaction support device according to any one of the above [1] to [4], when the received power at the power receiving point exceeds the contracted power, the virtual power adjusting facility controls the control device. A contract power excess prevention unit for inputting the value of the received power at the receiving point without inputting the value of the received power may be further provided.

[6] The electric power 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 via a receiving point. The values of the auxiliary power source and the received power at the receiving point are input, and the value of the discharging power of the auxiliary power source is controlled so that the value of the received power does not exceed a predetermined discharge threshold, and the value of the received power of the received power is controlled. It is a power transaction support method for adapting a power adjustment facility equipped with a control device for controlling the value of the charge power of the auxiliary power source so that the value does not exceed a predetermined charge threshold, and adapts the value to the power transaction. The first step of acquiring the target value of the auxiliary power source based on the demand response command requesting the increase or decrease of the power used in the transaction and the discharge of the auxiliary power source set to the same value in advance in the power adjustment facility. A second step of setting a power threshold having the same value as the threshold and the charging threshold, a third step of adding the target value of the auxiliary power source to the power threshold to calculate the virtual power received, and the calculated virtual power receiving. It is characterized by including a fourth step of outputting a value of electric power to the control device of the electric power adjusting facility in place of the value of electric power received at the receiving point.

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 power transaction device in which the power transaction support device according to the embodiment of the present invention is incorporated into an existing storage battery system.

The electric power trading device 100 is installed on the premises of a consumer, for example, and 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, the power trading device 100 is used. It is a system that enables power transactions by increasing (positive watts) or decreasing (negative watts) the received power by controlling the power.

Here, the virtual power plant refers to a general power transmission and distribution business operator or a retail electric power company. A resource aggregator is a business operator that controls power resources by directly concluding a virtual power plant service contract with a customer.

As shown in FIG. 1, the electric power transaction device 100 includes a storage battery system 1 and an electric power transaction support device 3 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 converter. For example, in the charging mode, the power conversion unit 12 converts AC power (AC) from the receiving point into DC 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 has a discharge control unit 14, a charge control unit 15, and a power adjustment value output unit as functional blocks for realizing a function of adjusting the discharge power and the charge power of the storage battery 11. It has 16. These functional blocks are input / output by, for example, in a program processing device (for example, a microcontroller) as a hardware resource constituting the control device 10 described above, in which a processor executes various operations according to a program stored in the storage device. It is realized by controlling peripheral circuits such as an I / 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 load power value PLB by, for example, adding the input power received power value and the power Pc value 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. 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.

Next, the details of the discharge control unit 14 will be described.

The discharge control unit 14 monitors the value of the load power PLB, and sets the discharge power adjustment value Pda so that the value of the load power PLB does not exceed a preset threshold value (hereinafter, also referred to as “discharge threshold value”) PA. calculate. Specifically, the discharge control unit 14 includes a discharge threshold value setting unit 140, a discharge power adjustment value calculation unit 141, and an output limiting unit 142.

The discharge threshold setting unit 140 sets the discharge threshold PA. Here, the discharge threshold PA is a threshold for limiting the discharge amount of the storage battery 11 so that the received power at the receiving point does not exceed the contracted power of the consumer when the storage battery 11 is discharged. In the storage battery system 1, the discharge power Pc of the storage battery 11 is adjusted with reference to the discharge threshold PA.

As the discharge threshold PA, for example, a value according to the contracted power of the consumer is set. For example, by setting the discharge threshold PA to a value lower than the contract power, the storage battery system 1 can operate with a margin. The discharge threshold PA is not limited to one, and a plurality of discharge threshold PAs may be set so that the threshold value to be used for control can be selected.

The discharge power adjustment value calculation unit 141 calculates the discharge power adjustment value Pda. The discharge power adjustment value Pda is a target value of the discharge power of the storage battery 11 for discharging the storage battery 11 so that the received power at the power receiving point does not exceed the discharge threshold PA.

Specifically, the discharge power adjustment value calculation unit 141 calculates the discharge power adjustment value Pda by subtracting the discharge threshold PA from the value of the load power PLB calculated by the load power calculation unit 13.

The discharge power adjustment value Pda calculated by the discharge power adjustment value calculation unit 141 is input to the output limiting unit 142, and the input discharge power adjustment value Pda is a positive value (for example, a value in the range of +9999 to 0). In some cases, the input discharge power adjustment value Pda is output as it is, and when the discharge power adjustment value Pda is a negative value, the discharge power adjustment value Pda is output as “0”.

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.

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 sets the charge power adjustment value Pca so that the value of the load power PLB does not exceed a preset threshold value (hereinafter, also referred to as “charge threshold value”) PB. calculate. Specifically, the charge control unit 15 includes a charge threshold value setting unit 150, a charge power adjustment value calculation unit 151, an output limit unit 152, and a maximum value selection unit 153.

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

As the charge threshold PB, for example, a value according to the contracted power of the consumer is set. For example, by setting the charge threshold value PB to a value lower than the contract power, the storage battery system 1 can operate with a margin. The charging threshold PB is not limited to one, and a plurality of charging thresholds PB may be set so that the threshold value to be used 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 charging threshold PB.

Specifically, the charging power adjustment value calculation unit 151 subtracts the charging threshold value PB from the value of the load power PLB calculated by the load power calculation unit 13 to calculate the charging power adjustment value Pca.

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 the larger one to the power adjustment value output 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 power adjustment value output unit 16.

In this way, the maximum value selection unit 153 selects the larger of the charging power adjustment value Pca and the charging power setting value Pcst, so that the received power at the receiving point (power of the load 2) is sufficiently larger than the charging threshold PB. Even in a situation where 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.

The power adjustment value output unit 16 outputs the discharge power adjustment value Pda input from the discharge control unit 14 or the charge power adjustment value Pca input from the charge control unit 15 to the power conversion unit 12. For example, when the discharge power adjustment value Pda input from the discharge control unit 14 is input, the power adjustment value output unit 16 outputs the discharge power adjustment value Pda to the power conversion unit 12 to control charging. When the charging power adjustment value Pca input from the unit 15 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 16. 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 electric power transaction support device 3 will be described.

The electric power transaction support device 3 is determined based on the value specified by the DR command value (value specified by the demand response) that triggers the electric power transaction, instead of the target value of the feedback system in the existing storage battery system 1 described above. It is a device that controls the storage battery system 1 with the set value as a new target value. In the present embodiment, the DR command (negawatt command) for reducing the power at the receiving point or discharging the storage battery 11 is represented by a positive value, and the DR command (positive watt command) for increasing the power at the receiving point or charging the storage battery 11 is negative. It shall be represented by the value of.

The power 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 electric power transaction support device 3 also includes, for example, a communication interface and 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. Further, the electric power transaction support device 3 may have some or all of its functions realized by a hardware logic circuit or the like.

As shown in FIG. 1, the electric power transaction support device 3 includes an individual device control unit 30, a power receiving point control unit 31, and electric power as functional blocks for realizing a function of supporting electric power transactions using the storage battery system 1. The threshold setting unit 32, the virtual power receiving power calculation unit 33, the virtual power receiving power adjusting unit 34, the virtual power receiving power output unit 35, the erroneous charging prevention unit 36, the frequency droop control unit (frequency deviation correction unit) 37, and the like. It is configured to include a contract power excess prevention unit 38.

The individual device control unit 30 and the power receiving point control unit 31 acquire the target value of the storage battery 11 based on the demand response command requesting the increase or decrease of the power used in the power transaction.

The DR command of the present embodiment includes the value of the discharge power or the value of the charge power of the storage battery 11 as the DR command value (first DR command value), and the discharge power based on the power received at the power receiving point. Some include a value or a value of charging power as a DR command value (second DR command value). The first DR command value is a value that directly specifies the output of the storage battery 11, while the second DR command value is based on the past power consumption of the consumer, which is called a baseline. It is a value that specifies the power to be increased or decreased based on the received power at the power receiving point estimated.

In the power transaction support device 3 of the present embodiment, the mode in which the individual device control unit 30 processes the DR command value is switched between the first mode and the mode in which the power receiving point control unit 31 processes the DR command value is switched between the second mode. It is equipped with a switching means. In the electric power transaction support device 3 of the present embodiment, the switching means is set to the first mode when the DR command value is the first DR command value, and is set to the second mode when the DR command value is the second DR command value. By switching, the individual device control unit 30 processes the first DR command value, and the power receiving point control unit 31 processes the second DR command value.

Here, the switching means will be described. The individual device control unit 30 is provided with the first mode changeover switch SW1, and the power receiving point control unit 31 is provided with the second mode changeover switch SW2. These first mode changeover switch SW1 and second mode changeover switch SW2 are so-called exclusive ON / OFF switches in which one is ON (closed state) and the other is OFF (open state). The individual device control unit 30 and the power receiving point control unit 31 are configured so that only one of them functions by the first mode changeover switch SW1 and the second mode changeover switch SW2.

FIG. 2 is a diagram showing a configuration example of a changeover SW that exclusively switches ON / OFF of the first mode changeover switch SW1 and the second mode changeover switch SW2. FIG. 2 shows an example in which the switching SW is configured by a hardware logic circuit.

The switching SW has a configuration in which one input n1 of two inputs n1 and n2 is inverted by a NOT gate, one output is branched into two outputs Out1 and Out2, and one output Out2 is inverted by a NOT gate. It is composed of OR gates.

Values corresponding to the DR command are input to the two inputs n1 and n2. A signal indicating whether or not DR is being activated is input to the input n1, and a signal indicating whether or not the DR command value is the first DR command value is input to the input n2. Of the two outputs Out1 and Out2, the output Out1 is connected to the first mode changeover switch SW1, and the output Out2 is connected to the second mode changeover switch SW2. The input n1 is put into the High state while the DR is activated, and the input n2 is put into the High state when it is in the first mode. The two outputs Out1 and Out2 are OFF (open state) in the Low state and ON (closed state) in the High state. Here, the operation of the switching SW will be described with the Low state as “0” and the High state as “1”.

1) First mode (mode in which the individual device control unit 30 processes the first DR command value)
"1" indicating that DR is being activated is input to the input n1, and "1" indicating the first mode is input to the input n2. As a result, the output Out1 becomes "1" and the output Out2 becomes "0". Therefore, the first mode changeover switch SW1 is "ON" and the second mode changeover switch SW2 is "OFF".

2) Second mode (mode in which the power receiving point control unit 31 processes the DR command value)
In the input n1, "1" indicating that DR is being activated is input, and in the input n2, "0" indicating that the mode is not the first mode is input. As a result, the output Out1 becomes "0" and the output Out2 becomes "1". Therefore, the first mode changeover switch SW1 is "OFF" and the second mode changeover switch SW2 is "ON".

Returning to FIG. 1, the individual device control unit 30 calculates the target value of the discharge power or the target value of the charge power of the storage battery 11 when the DR command includes the first DR command value. The individual device control unit 30 has a command value adjusting unit 301 and a first mode changeover switch SW1. The first mode changeover switch SW1 is turned on when the first mode is selected, and the individual device control unit 30 calculates the target value of the storage battery 11 based on the first DR command value. The individual device control unit 30 outputs the calculated target value of the storage battery 11 to the virtual power receiving power calculation unit 33.

The target value of the storage battery 11 calculated by the individual device control unit 30 may be the value of the discharge power or the value of the charge power of the storage battery 11 according to the DR command as it is, but in this embodiment, the frequency droop is executed. The correction value of is input, and the target value of the storage battery 11 is calculated by subtracting it.

The power receiving point control unit 31 calculates the target value of the discharge power or the target value of the charging power of the storage battery 11 when the DR command includes the second DR command value. The power receiving point control unit 31 includes a baseline addition unit 311, a power receiving point power subtraction unit 312, and a second mode changeover switch SW2. The second mode changeover switch SW2 is turned on when the second mode is selected, and the power receiving point control unit 31 calculates the target value of the storage battery 11 based on the DR command value. The power receiving point control unit 31 outputs the calculated target value of the storage battery 11 to the virtual power receiving power calculation unit 33.

The baseline addition unit 311 calculates the baseline addition value by adding the value of the baseline BL to the second DR command value. The second DR directive value is the net power to be increased or decreased by the DR directive with respect to the baseline power. Therefore, the baseline addition value is equal to the target value of the received power at the receiving point to be adjusted by the DR command. The baseline addition unit 311 outputs the calculated baseline addition value to the power receiving point power subtraction unit 312.

The power receiving point power subtraction unit 312 subtracts the target value (baseline addition value) of the power received at the power receiving point according to the DR command from the power received power (measured value of received power) PjA at the actual power receiving point. The value of the difference between the target value of the received power at the receiving point and the received power at the actual receiving point is the target value of the discharge power of the storage battery 11 or the target value of the charging power required to realize the second DR command value. Is equal to. If the baseline BL value and the received power measurement value PjA do not match, the calculated target value is different from the value commanded by the second DR command value. The power receiving point power subtraction unit 312 outputs the calculated target value of the storage battery 11 to the virtual power receiving power calculation unit 33.

In the power threshold setting unit 32, the same values as the values set in the discharge threshold PA and the charge threshold PB are set as the threshold (hereinafter, also referred to as “power threshold”) PD.

When the target value of the storage battery 11 calculated by the individual device control unit 30 is input, the virtual power receiving power calculation unit 33 adds the target value to the power threshold value PD to calculate the virtual power receiving power PjB. Similarly, when the target value of the storage battery 11 calculated by the power receiving point control unit 31 is input, the virtual power receiving power calculation unit 33 adds from the power threshold value PD to calculate the virtual power receiving power PjB. The virtual power receiving power calculation unit 33 outputs the calculated virtual power receiving power PjB to the virtual power receiving power adjusting unit 34.

When the DR command includes the first DR command value, the virtual power receiving power adjusting unit 34 adjusts the virtual power receiving power PjB with the output of the storage battery 11 and outputs it to the virtual power receiving power output unit 35. When the DR command includes the second DR command value, the virtual power receiving power adjusting unit 34 outputs the received virtual power receiving power PjB to the virtual power receiving power output unit 35 as it is. Specifically, the virtual power receiving power adjusting unit 34 has the first mode changeover switch SW1 and inputs the output value of the storage battery 11 when the first mode changeover switch SW1 is ON to receive the virtual power reception. Add to power PjB.

When the virtual received power output unit 35 receives the value of the virtual received power PjB, the virtual received power output unit 35 outputs the received virtual received power value PjB to the control device 10 of the storage battery system 1 instead of the received power measured value PjA.

The erroneous charge prevention unit 36 causes the virtual power receiving power output unit 35 to change the value of the virtual power receiving power PjB to the control device 10 of the storage battery system 1 instead of the power receiving power measurement value PjA only during the operation of the power transaction support device 3. Allow output. Specifically, for example, a switching unit 361 that allows input of a virtual power receiving power PjB value to two input units of the virtual power receiving power output unit 35, and a switching unit that permits input of a value of the received power measured value PjA. It is composed of 362, a switch 363 that inputs a signal in which only the switching unit 361 is active while the power transaction support device 3 is operating, and only the switching unit 362 is active while the power transaction support device 3 is stopped, and a NOT gate 364. can do. By switching the input to the virtual power receiving power output unit 35, the erroneous charging prevention unit 36 determines whether the output of the virtual power receiving power output unit 35 is the virtual power receiving power PjB depending on whether the power transaction support device 3 is operating or not. It suffices if it can be switched to either the received power measurement value PjA, and the virtual received power output unit 35 itself may have the function of the erroneous charge prevention unit 36.

In the power trading device 100 of the present embodiment, it is necessary to set the storage battery system 1 to the charging mode so that the charging control unit 15 functions. However, if the received power measurement value PjA smaller than the value set as the charge threshold value PB is input before the start of the operation in response to the DR command, the storage battery 11 is charged even though it does not need to be charged. It ends up. In order to prevent this, the erroneous charge prevention unit 36 can be switched so that the received power measurement value PjA smaller than the charge threshold value PB is not input to the control device 10 after being set to the charge mode. In that case, before switching the storage battery system 1 to the charging mode, it is necessary to switch the storage battery system 1 during operation of the power transaction support device 3 by the erroneous charging prevention unit 36.

The frequency droop control unit 37 executes frequency droop control. Specifically, the frequency deviation, which is the difference between the power supply frequency and the reference frequency at the power receiving point, is converted into the first frequency deviation correction value, which is the power value, and a predetermined offset value is used for the first frequency deviation correction value. Is added to calculate the second frequency deviation correction value.

The frequency droop control unit 37 can realize a so-called governor-free function of increasing the output when the power supply frequency drops and decreasing the output when the power supply frequency rises when executing a power transaction.

The contract power excess prevention unit 38 adjusts the received power measurement value PjA so as not to exceed the contract power as a result of the storage battery system 1 being controlled by the virtual power received power PjB. Specifically, when the difference value (contract power difference value) obtained by subtracting the contract power value from the received power measurement value PjA becomes positive, the correction value is calculated so that the contract power difference value becomes 0. The correction value is added when the virtual power receiving power adjustment unit 34 calculates the adjustment value of the virtual power receiving power PjB.

Next, the operation of the electric power trading apparatus according to the first embodiment will be described with reference to the drawings.

3 to 7 are timing charts showing changes in electric power before and after the start (activation) of the operation in response to the DR command in the electric power trading apparatus 100 of FIG. The timing charts shown in FIGS. 3 to 7 show changes in the load power PL, the received power measured value PjA, the received power correction value (virtual received power PjB), and the storage battery output Pc. Since the electric power transaction device 100 operates differently depending on the DR command value included in the DR command, each operation will be described for each DR command value. In this example, it is assumed that the load power PL before the start of the operation according to the DR command is 5000 kW and the baseline BL is 5200 kW.

The power trading device 100 according to the first embodiment sets the discharge threshold PA, the charging threshold PB, and the power threshold PD of the control device 10 of the storage battery system 1 to the same values in advance before the operation of the power trading support device 3. At the same time, the charging power setting value Pcst is set to, for example, −2000 kW in order to put the storage battery system 1 in the charging mode. In this example, it is assumed that the discharge threshold PA, the charge threshold PB, and the power threshold PD are each set to 7000 kW.

(First DR command value that specifies the value of the charging power of the storage battery 11)
FIG. 3 is a timing chart when the DR command includes the first DR command value in which the value of the charging power of the storage battery 11 is 500 kW.

As shown in FIG. 3, before the start (activation) of the operation in response to the DR command, the virtual power receiving power calculation unit 33 calculates the 7000 kW set in the power threshold PD as the virtual power receiving power PjB, and the power receiving power correction value. However, the discharge power adjustment value Pda calculated by the discharge power adjustment value calculation unit 141 of the control device 10 is 0 kW. Similarly, the charging power adjustment value Pca calculated by the charging power adjustment value calculation unit 151 is also 0 kW. As a result, the storage battery output Pc is 0 kW.

Next, when the operation in response to the DR command is started, the individual device control unit 30 calculates it as −500 kW based on the first DR command value included in the DR command, and the virtual power receiving power calculation unit 33 determines. The virtual power received PjB is calculated as 6500 kW. At this time, since the storage battery output Pc is still 0 kW, the virtual received power output unit 35 outputs 6500 kW (received power correction value).

In the control device 10 that has received the virtual power receiving power PjB of 6500 kW, the discharge power adjustment value Pda is calculated to be −500 kW by the discharge power adjustment value calculation unit 141, but the output limit unit 142 is 0 kW. 0 kW of the discharge power adjustment value Pda is input to the power adjustment value output unit 16.

Similarly, the charging power adjustment value calculation unit 151 also calculates the charging power adjustment value Pca to be −500 kW. In the maximum value selection unit 153, -500 kW of the charging power adjustment value Pca output from the output limiting unit 152 and -2000 kW of the charging power set value Pcst are input, so the maximum value of -500 kW is selected. , Output to the power adjustment value output unit 16.

The power adjustment value output unit 16 outputs −500 kW, which is the charge power adjustment value Pca input from the charge control unit 15, to the power conversion unit 12. When the power conversion unit 12 controls the storage battery 11 to charge 500 kW according to the power adjustment value input from the power adjustment value output unit 16, the storage battery output Pc becomes −500 kW (that is, charging of 500 kW).

After that, the virtual received power calculation unit 33 calculates the virtual received power PjB as 6500 kW, and the virtual received power adjusting unit 34 adjusts the virtual received power PjB of 6500 kW with the storage battery output Pc of −500 kW. Specifically, the virtual power receiving power PjB is adjusted to 7000 kW by subtracting −500 kW of the storage battery output Pc from the virtual power received power PjB of 6500 kW. The virtual received power output unit 35 outputs 7000 kW (received power correction value).

The control device 10 that has received the virtual power receiving power PjB of 7,000 kW adds the virtual power received power PjB of 7,000 kW input by the load power calculation unit 13 and the storage battery output Pc of -500 kW to set the load power value PLB to 6500 kW. calculate. The discharge power adjustment value calculation unit 141 subtracts the discharge threshold value 7000 kW from the load power value PLB of 6500 kW to obtain −500 kW, but the output limiting unit 142 sets it to 0 kW. 0 kW is input to the power adjustment value output unit 16 as the discharge power adjustment value Pda.

Similarly, the charging power adjustment value calculation unit 151 also calculates the charging power adjustment value Pca to be −500 kW. In the maximum value selection unit 153, -500 kW of the charging power adjustment value Pca output from the output limiting unit 152 and -2000 kW of the charging power set value Pcst are input, so the maximum value of -500 kW is selected. , Output to the power adjustment value output unit 16.

The power adjustment value output unit 16 outputs −500 kW of the charge power adjustment value Pca input from the charge control unit 15 to the power conversion unit 12. The power conversion unit 12 controls the storage battery 11 to charge 500 kW according to the power adjustment value input from the power adjustment value output unit 16, and the storage battery output Pc is controlled to −500 kW. By controlling the storage battery output Pc to −500 kW in this way, a positive watt of 500 kW is realized.

(First DR command value that specifies the value of the discharge power of the storage battery 11)
FIG. 4 is a timing chart when the DR command includes the first DR command value in which the value of the discharge power of the storage battery 11 is 500 kW.

As shown in FIG. 4, before the start (activation) of the operation according to the DRDR command, the virtual power receiving power calculation unit 33 calculates the 7000 kW set in the power threshold PD as the virtual power receiving power PjB, and the power receiving power correction value. However, the discharge power adjustment value Pda calculated by the discharge power adjustment value calculation unit 141 of the control device 10 is 0 kW. Similarly, the charging power adjustment value Pca calculated by the charging power adjustment value calculation unit 151 is also 0 kW. As a result, the storage battery output Pc is 0 kW.

Next, when DR is started, the individual device control unit 30 calculates 500 kW based on the first DR command value included in the DR command, and the virtual power receiving power calculation unit 33 sets the virtual power receiving power PjB to 7500 kW. Is calculated. At this time, since the storage battery output Pc is still 0 kW, the virtual received power output unit 35 outputs 7500 kW (received power correction value).

The control device 10 that has received the virtual power receiving power PjB of 7500 kW calculates the discharge power adjustment value Pda as 500 kW by the discharge power adjustment value calculation unit 141. The calculated discharge power adjustment value Pda of 500 kW is input to the power adjustment value output unit 16.

Similarly, the charging power adjustment value calculation unit 151 also calculates the charging power adjustment value Pca to be 500 kW, but the output limiting unit 152 sets it to 0 kW. Since 0 kW of the charging power adjustment value Pca output from the output limiting unit 152 and -2000 kW of the charging power set value Pcst are input to the maximum value selection unit 153, the maximum value of 0 kW is selected and the power is selected. It is output to the adjustment value output unit 16.

The power adjustment value output unit 16 outputs 500 kW, which is the discharge power adjustment value Pda input from the discharge control unit 14, to the power conversion unit 12. When the power conversion unit 12 controls the storage battery 11 to discharge 500 kW according to the power adjustment value input from the power adjustment value output unit 16, the storage battery output Pc becomes 500 kW.

After that, the virtual power receiving power calculation unit 33 calculates the virtual power receiving power PjB as 7500 kW, and the virtual power receiving power adjusting unit 34 adjusts the virtual power received power PjB of 7500 kW with the storage battery output Pc of 500 kW. Specifically, the virtual power receiving power PjB is adjusted to 7,000 kW by subtracting 500 kW of the storage battery output Pc from the virtual power received power PjB of 7,500 kW. The virtual received power output unit 35 outputs 7000 kW (received power correction value).

The control device 10 that has received the virtual power receiving power PjB of 7,000 kW adds the virtual power received power PjB of 7,000 kW input by the load power calculation unit 13 and the storage battery output Pc of 500 kW to calculate the load power value PLB as 7,500 kW. do. The discharge power adjustment value calculation unit 141 calculates the discharge power adjustment value Pda as 500 kW by subtracting the discharge threshold value of 7,000 kW from the load power value PLB of 7,500 kW. The calculated discharge power adjustment value Pda of 500 kW is input to the power adjustment value output unit 16.

Similarly, the charging power adjustment value calculation unit 151 also calculates the charging power adjustment value Pca to be 500 kW, but the output limiting unit 152 sets it to 0 kW. Since 0 kW of the charging power adjustment value Pca output from the output limiting unit 152 and -2000 kW of the charging power set value Pcst are input to the maximum value selection unit 153, the maximum value of 0 kW is selected and the power is selected. It is output to the adjustment value output unit 16.

The power adjustment value output unit 16 outputs 500 kW, which is the discharge power adjustment value Pda input from the discharge control unit 14, to the power conversion unit 12. The power conversion unit 12 controls the storage battery 11 to discharge 500 kW according to the power adjustment value input from the power adjustment value output unit 16, and the storage battery output Pc is controlled to 500 kW. By controlling the storage battery output Pc to 500 kW in this way, a negawatt of 500 kW is realized.

(When the load suddenly increases at the first DR command value that specifies the value of the charging power of the storage battery 11)
FIG. 5 is a timing chart when the load suddenly increases from 6000 kW to 7700 kW when the storage battery 11 is controlled according to the DR command including the first DR command value of 500 kW. be.

In this case, when the load is 6000 kW, the storage battery output Pc is −500 kW. That is, the storage battery output Pc is charged at 500 kW. If the load increases to 7700 kW in this state, the measured power received PjA rapidly increases to 8200 kW.

When the measured power received power PjA suddenly increases to 8200 kW, the contracted power value 7500 kW is exceeded. The correction value is calculated so as to be. The correction value is added when the virtual power receiving power adjustment unit 34 calculates the adjustment value of the virtual power receiving power PjB. As a result, the storage battery output Pc is controlled to 200 kW so that the measured power received PjA is 7500 kW. That is, the storage battery output Pc discharges 200 kW.

(Second DR command value that specifies the value of charging power based on the received power at the power receiving point)
FIG. 6 is a timing chart when the DR command includes a second DR command value that specifies that the received power is 500 kW higher than the baseline power.

As shown in FIG. 6, at the start of the operation in response to the DR command (before activation), the virtual power receiving power calculation unit 33 calculates the 7000 kW set in the power threshold PD as the virtual power receiving power PjB, and the power receiving power correction value. However, the discharge power adjustment value Pda calculated by the discharge power adjustment value calculation unit 141 of the control device 10 is 0 kW. Similarly, the charging power adjustment value Pca calculated by the charging power adjustment value calculation unit 151 is also 0 kW. As a result, the storage battery output Pc is 0 kW.

Next, when DR is started, the baseline addition unit 311 of the power receiving point control unit 31 sets the baseline value to the second DR command value of 500 kW based on the second DR command value included in the DR command. 5200 kW is added as BL, and the baseline addition value of 5700 kW is calculated.

The power receiving point power subtraction unit 312 subtracts the baseline addition value of 5700 kW from the power received power measurement value of 5000 kW to calculate the target value of the charging power of the storage battery 11 as −700 kW.

The virtual power receiving power calculation unit 33 adds 7000 kW of the power threshold PD and the target value of the charging power of the storage battery 11 to −700 kW, and calculates the virtual power received power PjB as 6300 kW. At this time, since the storage battery output Pc is still 0 kW, the virtual received power output unit 35 outputs 6300 kW (received power correction value).

In the control device 10 that has received the virtual power receiving power PjB of 6300 kW, the discharge power adjustment value Pda is calculated to be −700 kW by the discharge power adjustment value calculation unit 141, but the output limit unit 142 is 0 kW. 0 kW of the discharge power adjustment value Pda is input to the power adjustment value output unit 16.

Similarly, the charging power adjustment value calculation unit 151 also calculates the charging power adjustment value Pca to be −700 kW. In the maximum value selection unit 153, -700 kW of the charging power adjustment value Pca output from the output limiting unit 152 and -2000 kW of the charging power set value Pcst are input, so the maximum value of -700 kW is selected. , Output to the power adjustment value output unit 16.

The power adjustment value output unit 16 outputs −700 kW, which is the charge power adjustment value Pca input from the charge control unit 15, to the power conversion unit 12. When the power conversion unit 12 controls the storage battery 11 to charge 700 kW according to the power adjustment value input from the power adjustment value output unit 16, the storage battery output Pc becomes −700 kW (that is, charging of 700 kW).

After that, when the storage battery output Pc becomes −700 kW, the received power measurement value PjA increases to 5700 kW, although the load does not fluctuate. Due to this increase, the power receiving point power subtraction unit 312 subtracts the baseline addition value of 5700 kW from the power received power measurement value of 5700 kW, and calculates the target value of the charging power of the storage battery 11 as 0 kW. When the target value of the charging power of the storage battery 11 is 0 kW, the virtual received power calculation unit 33 calculates the virtual received power PjB as 7,000 kW, and the virtual received power output unit 35 outputs 7,000 kW (received power correction value).

The control device 10 that has received the virtual power receiving power PjB of 7,000 kW adds the virtual power received power PjB of 7,000 kW input by the load power calculation unit 13 and the storage battery output Pc of -700 kW to set the load power value PLB to 6300 kW. calculate. The discharge power adjustment value calculation unit 141 subtracts the discharge threshold value 7000 kW from the load power value PLB of 6300 kW to obtain −700 kW, but the output limiting unit 142 sets it to 0 kW. 0 kW is input to the power adjustment value output unit 16 as the discharge power adjustment value Pda.

Similarly, the charging power adjustment value calculation unit 151 also calculates the charging power adjustment value Pca to be −700 kW. In the maximum value selection unit 153, -700 kW of the charging power adjustment value Pca output from the output limiting unit 152 and -2000 kW of the charging power set value Pcst are input, so the maximum value of -700 kW is selected. , Output to the power adjustment value output unit 16.

The power adjustment value output unit 16 outputs −700 kW of the charge power adjustment value Pca input from the charge control unit 15 to the power conversion unit 12. The power conversion unit 12 controls the storage battery 11 to charge 700 kW according to the power adjustment value input from the power adjustment value output unit 16, and the storage battery output Pc is controlled to −700 kW. By controlling the storage battery output Pc to −700 kW in this way, the received power measurement value PjA is controlled to 5700 kW. Since the baseline value BL is 5200 kW, it means that a positive watt of 500 kW has been realized.

(Second DR command value that specifies the value of the discharge power based on the received power at the power receiving point)
FIG. 7 is a timing chart when the DR command includes a second DR command value that specifies that the received power is 500 kW less than the baseline power.

As shown in FIG. 7, at the start of the operation (before activation) in response to the DR command, the virtual power receiving power calculation unit 33 calculates 7000 kW set in the power threshold PD as the virtual power receiving power PjB, and the power receiving power correction value. However, the discharge power adjustment value Pda calculated by the discharge power adjustment value calculation unit 141 of the control device 10 is 0 kW. Similarly, the charging power adjustment value Pca calculated by the charging power adjustment value calculation unit 151 is also 0 kW. As a result, the storage battery output Pc is 0 kW.

Next, when DR is started, the baseline addition unit 311 of the power receiving point control unit 31 sets the baseline to the second DR command value -500 kW based on the second DR command value included in the DR command. The value of 5200 kW is added to calculate the baseline addition value of 4700 kW.

The power receiving point power subtraction unit 312 subtracts the baseline addition value of 4700 kW from the power received power measurement value of 5000 kW to calculate the target value of the discharge power of the storage battery 11 as 300 kW.

The virtual power receiving power calculation unit 33 adds the power threshold value PD of 7,000 kW and the target value of the discharge power of the storage battery 11 to 300 kW, and calculates the virtual power received power PjB as 7300 kW. At this time, since the storage battery output Pc is still 0 kW, the virtual received power output unit 35 outputs 7300 kW (received power correction value).

The control device 10 that has received the virtual power receiving power PjB of 7300 kW calculates the discharge power adjustment value Pda as 300 kW by the discharge power adjustment value calculation unit 141. The calculated discharge power adjustment value Pda of 300 kW is input to the power adjustment value output unit 16.

Similarly, the charging power adjustment value calculation unit 151 also calculates the charging power adjustment value Pca as 300 kW, but the output limiting unit 152 sets it to 0 kW. Since 0 kW of the charging power adjustment value Pca output from the output limiting unit 152 and -2000 kW of the charging power set value Pcst are input to the maximum value selection unit 153, the maximum value of 0 kW is selected and the power is selected. It is output to the adjustment value output unit 16.

The power adjustment value output unit 16 outputs 300 kW, which is the discharge power adjustment value Pda input from the discharge control unit 14, to the power conversion unit 12. When the power conversion unit 12 controls the storage battery 11 to discharge 300 kW according to the power adjustment value input from the power adjustment value output unit 16, the storage battery output Pc becomes 300 kW.

After that, when the storage battery output Pc becomes 300 kW, the received power measurement value PjA decreases to 4700 kW, although the load does not fluctuate. Due to this decrease, the power receiving point power subtraction unit 312 subtracts the baseline addition value 4700 kW from the power received power measurement value PjA of 4700 kW, and calculates the target value of the charging power of the storage battery 11 as 0 kW. When the target value of the charging power of the storage battery 11 is 0 kW, the virtual received power calculation unit 33 calculates the virtual received power PjB as 7,000 kW, and the virtual received power output unit 35 outputs 7,000 kW (received power correction value).

The control device 10 that has received the virtual power receiving power PjB of 7,000 kW adds the virtual power received power PjB of 7,000 kW input by the load power calculation unit 13 and the storage battery output Pc of 300 kW, and calculates the load power value PLB as 7300 kW. do. The discharge power adjustment value calculation unit 141 calculates the discharge power adjustment value Pda as 300 kW by subtracting the discharge threshold value of 7000 kW from the load power value PLB of 7300 kW. The calculated discharge power adjustment value Pda of 300 kW is input to the power adjustment value output unit 16.

Similarly, the charging power adjustment value calculation unit 151 also calculates the charging power adjustment value Pca as 300 kW, but the output limiting unit 152 sets it to 0 kW. Since 0 kW of the charging power adjustment value Pca output from the output limiting unit 152 and -2000 kW of the charging power set value Pcst are input to the maximum value selection unit 153, the maximum value of 0 kW is selected and the power is selected. It is output to the adjustment value output unit 16.

The power adjustment value output unit 16 outputs 300 kW, which is the discharge power adjustment value Pda input from the discharge control unit 14, to the power conversion unit 12. The power conversion unit 12 controls the storage battery 11 to discharge 300 kW according to the power adjustment value input from the power adjustment value output unit 16, and the storage battery output Pc is controlled to 300 kW. By controlling the storage battery output Pc to 300 kW in this way, the received power measurement value PjA is controlled to 4700 kW. Since the baseline value BL is 5200 kW, it means that a negawatt of 500 kW has been realized.

As described above, in the power transaction support device 3 according to the present embodiment, the DR command value included in the DR command is the discharge power value or the charge power value of the storage battery 11 as the DR command value (first DR command value). Regardless of whether the value of the discharge power or the value of the charge power based on the power received at the power receiving point is the DR command value, the charge and discharge of the storage battery are switched as necessary. Since the output can be controlled, it is possible to realize power trading according to a wide range of DR commands.

In addition, existing storage battery systems (an example of power adjustment equipment) are often configured to be digitally connected to a core system, and devices that are digitally connected to the storage battery system from the outside are being shunned from the viewpoint of security. The electric power transaction support device of the present embodiment merely gives an analog input value to the storage battery system, and does not digitally access the contents of the storage battery system. Therefore, it can be said that it is preferable from the viewpoint of security as a device to be connected to an existing storage battery system.

(Extension of embodiment)
The inventions made by the present inventors have been specifically described above based on the embodiments, but the present invention is not limited thereto, and various modifications can be made without departing from the gist thereof. Needless to say.

For example, in the configuration of FIG. 1, an example in which the contract power excess prevention unit 38 is provided in the input unit of the virtual power reception power adjustment unit 34 has been described. However, as shown in FIG. 8, a contract power excess prevention unit 38 configured so as not to process the DR command value included in the DR command when a contract excess occurs is provided immediately after the input unit of the DR command value. You may.

Further, for example, in the above embodiment, the configuration of the power transaction device in which the power transaction support device is incorporated into the storage battery system which is an existing power adjustment facility has been described as an example. However, the power adjustment equipment is not limited to the storage battery system, and may be incorporated into a system that also uses a generator as an auxiliary power source. In this case, the power trading device may be additionally provided with means for activating the generator. As a means of starting the generator, in the case of a method of starting by a start signal, a means of inputting a start signal to the generator can be adopted, and a method in which a threshold value is set so that the generator is in the start state is set. In the case of, a means for giving a pulse so as to exceed the threshold value set at the start of the generator can be adopted.

100 ... Electric power trading device, 1 ... Storage battery system, 10 ... Control device, 11 ... Storage battery, 12 ... Power conversion unit, 13 ... Load power calculation unit, 14 ... Discharge control unit, 140 ... Discharge threshold setting unit, 141 ... Discharge power Adjustment value calculation unit, 142 ... Output limit unit, 15 ... Charge control unit, 150 ... Charge threshold setting unit, 151 ... Charge power adjustment value calculation unit, 152 ... Output limit unit, 153 ... Maximum value selection unit, 16 ... Power adjustment Value output unit, 2 ... load, 3 ... power transaction support device, 30 ... individual device control unit, 31 ... power receiving point control unit, 32 ... power threshold setting unit, 33 ... virtual power receiving power calculation unit, 34 ... virtual power receiving power adjustment Unit, 35 ... Virtually received power output unit, 36 ... False charge prevention unit, 37 ... Frequency droop control unit, 38 ... Contract power excess prevention unit

Claims (6)

For a load that receives power from the outside via the power receiving point, an auxiliary power source 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 power received. The value of the discharge power of the auxiliary power source is controlled so that the value of does not exceed the predetermined discharge threshold, and the value of the charge power of the auxiliary power source does not exceed the predetermined charge threshold. It is a power transaction support device that can be connected to a power regulation facility equipped with a control device that controls the power.
A target value acquisition unit that acquires a target value of the auxiliary power source based on a demand response command that requests an increase or decrease in power consumption in power transactions.
A power threshold value setting unit in which a power threshold value having the same value as the discharge threshold value and the charge threshold value of the auxiliary power source, which are set to the same value in advance in the power adjustment facility, is set.
A virtual power receiving power calculation unit that calculates a virtual power receiving power by adding a target value of the auxiliary power source to the power threshold value, and a virtual power receiving power calculation unit.
A virtual power receiving power output unit that outputs the calculated virtual power receiving power value to the control device of the power adjusting facility in place of the power receiving power value at the power receiving point.
A power transaction support device characterized by being equipped with. The electric power transaction support device according to claim 1.
The target value acquisition unit includes an individual control target value calculation unit that calculates a target value of the auxiliary power source based on a demand response command that specifies a discharge power value or a charge power value of the auxiliary power source, and the power reception unit. It has a demand response command that specifies the value of the amount of power increase or decrease and a power receiving point control target value calculation unit that calculates the target value of the auxiliary power source based on the value of the power received at the power receiving point. A power transaction support device characterized by acquiring the target value of an auxiliary power source calculated by the control target value calculation unit or the power receiving point control target value calculation unit. The electric power transaction support device according to claim 1 or 2.
Further, a virtual power receiving power output permitting unit that allows the virtual power receiving power output unit to output the value of the virtual power receiving power instead of the value of the received power at the power receiving point to the control device of the power adjusting facility is further provided. An electric power trading support device characterized by being equipped. The electric power transaction support device according to claim 2 or 3, which cites claim 2.
The frequency deviation, which is the difference between the power supply frequency and the reference frequency at the power receiving point, is converted into the first frequency deviation correction value, which is the power value, and a predetermined offset value is added to the first frequency deviation correction value. Further equipped with a frequency deviation correction unit for calculating a second frequency deviation correction value,
The individual control target value calculation unit includes a command value adjusting unit that subtracts the second frequency deviation correction value from the discharge power value or the charging power value included in the demand response command. Support device. The electric power transaction support device according to any one of claims 1 to 4.
When the received power at the receiving point exceeds the contracted power, the contracted power excess prevention is performed by inputting the value of the received power at the receiving point without inputting the value of the virtual received power into the control device of the power adjusting facility. An electric power trading support device characterized by having an additional unit. For a load that receives power from the outside via the power receiving point, an auxiliary power source 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 power received. The value of the discharge power of the auxiliary power source is controlled so that the value of does not exceed the predetermined discharge threshold, and the value of the charge power of the auxiliary power source does not exceed the predetermined charge threshold. It is a power trading support method for adapting a power regulation facility equipped with a control device for controlling power to power trading.
The first step of acquiring the target value of the auxiliary power source based on the demand response command requesting the increase or decrease of the power used in the power transaction, and
The second step of setting the power threshold value of the same value as the discharge threshold value and the charge threshold value of the auxiliary power source, which are set to the same value in advance in the power adjustment facility,
The third step of calculating the virtual received power by adding the target value of the auxiliary power source to the power threshold, and
The fourth step of outputting the calculated virtual power received power value to the control device of the power adjusting facility instead of the power received power value at the power receiving point.
A power transaction support method characterized by including.

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