JP7419916B2 - Power trading support device and power trading method - Google Patents

Description

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

Conventional power grids generally take the form of supplying electricity generated by large power plants such as thermal power plants and hydroelectric power plants to businesses and households that are consumers of electricity. In recent years, power grids using virtual power plants (VPPs) have been attracting attention as an alternative to conventional power grids. Virtual power plants are decentralized using advanced energy management technology that makes full use of IoT, in order to utilize widely spread energy resources (distributed energy resources) such as solar power generation, storage batteries, electric vehicles, and negawatts (power-saving electricity). The system remotely and integratedly controls the energy resources of the plant and functions as if it were a single power plant.

In recent years, progress has been made in the development of technology for trading negawatts, which is one of the distributed energy resources of virtual power plants.

Here, a virtual power plant is a power plant created by the owner or a third party of distributed energy resources such as power generation equipment and power storage equipment that are directly connected to the power grid, by controlling the distributed energy resources. This means providing equivalent functionality. The virtual power plant is composed of, for example, a resource aggregator, an aggregation coordinator, and the like.

A resource aggregator is an operator that controls power resources by directly concluding virtual power plant service contracts with consumers. An aggregation coordinator is an operator who bundles the electricity controlled by a resource aggregator and trades electricity directly with a general power transmission and distribution company or a retail electricity company. Further, negawatt trading refers to, for example, trading of reduced demand for electricity in response to requests from power transmission and distribution companies, resource aggregators, and the like.

For example, Patent Document 1 discloses a negawatt transaction support device for realizing negawatt trading using an existing storage battery system that has a received power adjustment function that adjusts received power at a power receiving point to power below a contract power threshold. ing.

The negawatt transaction support device disclosed in Patent Document 1 monitors the received power at a power receiving point (hereinafter also referred to as "power receiving point power") and prevents the power receiving point from exceeding a predetermined threshold (load following threshold). It is connected to the front stage of a storage battery system with a load following function that discharges the storage battery and supplies power to the load, and realizes negawatt trading by adjusting the apparent value of the received power and inputting it to the storage battery system. It is a device.

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

Japanese Patent Application Publication No. 2018-160949

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

In such a situation, one possible way to balance the power supply and demand is to conduct posiwatt trading, which is a transaction of increased power demand, between power transmission and distribution companies and consumers. In Posiwatt trading, power transmission and distribution companies use the Demand Response Directive (hereinafter also referred to as the "Negawatt Directive"), which instructs an increase in power usage, as opposed to the Demand Response Directive (hereinafter also referred to as the "Negawatt Directive"), which instructs a reduction in power usage. (Hereinafter, also referred to as a "Posiwatt command.") is transmitted to the consumer, and the consumer increases the power used in accordance with the Posiwatt command, thereby trading the increased amount of power used by the consumer. By performing this posiwatt transaction, it becomes possible to balance the supplied power and the demanded power in a situation where the supplied power exceeds the demanded power.

However, in a storage battery system equipped with a general receiving power adjustment function, a predetermined threshold value (hereinafter referred to as " It is equipped with a function to control the charging power of the storage battery so as not to exceed the maximum power value at the receiving point during charging (also referred to as the "charging threshold") (hereinafter also referred to as the "maximum power limiting function at the receiving point during charging"). However, it does not have a function to control charging of the storage battery according to commands from the outside.

Further, the negawatt transaction support device disclosed in Patent Document 1 mentioned above has a function for using an existing storage battery system etc. for negawatt transaction, but does not have a function for realizing posiwatt transaction.

In this way, power transactions between power transmission and distribution companies and consumers include negawatt transactions and posiwatt transactions, but existing power adjustment equipment such as battery storage systems can handle both negawatt transactions and posiwatt 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 trading and positive wattage trading in power trading using existing power adjustment equipment to realize optimal power trading. It's about doing.

A power trading support device according to a typical embodiment of the present invention provides an auxiliary power source capable of supplying power to a load that receives power from the outside via a power receiving point, separately from the power from the outside. and the value of the received power at the power receiving point is input, and the value of the discharge 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 set to a predetermined value. A power trading support device connectable to power adjustment equipment comprising a control device that controls the charging power value of the auxiliary power source so as not to exceed a charging threshold of the charging power source, the power trading support device comprising: an increase or decrease in power usage in power trading; a target value acquisition unit that acquires a target value of the auxiliary power source based on a demand response command requesting the same; a power threshold setting unit in which a power threshold is set; a virtual received power calculation unit that calculates virtual received power by adding a target value of the auxiliary power source to the power threshold; The power receiving apparatus is characterized by comprising a virtual received power output unit that outputs to the control device of the power adjustment equipment instead of the value of the received power at the power receiving point.

According to the present invention, it is possible to switch between negawatt trading and positive wattage trading in power trading using existing power adjustment equipment.

1 is a diagram illustrating a configuration example of a power trading device in which a power trading support device is incorporated into an existing storage battery system. It is a figure which shows the example of a structure of the switch SW which exclusively switches ON/OFF of 1st mode changeover switch SW1 and 2nd mode changeover switch SW2. It is a timing chart when the DR command includes a first DR command value that sets the charging power value of the storage battery 11 to 500 kW. It is a timing chart when the DR command includes a first DR command value that sets the value of the discharge power of the storage battery 11 to 500 kW. It is a timing chart when the load suddenly increases from 6000 kW to 7700 kW while controlling according to a DR command that includes a first DR command value that sets the charging power value of the storage battery 11 to 500 kW. It is a timing chart when the DR command includes a second DR command value specifying that the received power is 500 kW higher than the baseline power. It is a timing chart when the DR command includes a second DR command value specifying that the received power is 500 kW less than the baseline power. FIG. 7 is a diagram illustrating another configuration example of a power trading device in which a power trading support device is incorporated into an existing storage battery system.

1. Overview of Embodiments First, an overview of typical embodiments of the invention disclosed in this application will be described. In the following description, as an example, reference numerals on the drawings corresponding to constituent elements of the invention are written in parentheses.

[1] The power trading support device (3) according to a typical embodiment of the present invention provides a power trading support device (3) for a load (2) that receives power from the outside via a power receiving point, An auxiliary power source (11) that can separately supply power, and a value of the received power at the power 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. Connectable to a power adjustment facility (1) comprising a control device that controls the value of electric power and also controls the value of charging power of the auxiliary power source so that the value of the received power does not exceed a predetermined charging threshold. The power trading support device (3) includes a target value acquisition unit (30) that acquires a target value of the auxiliary power source (11) based on a demand response command requesting an increase or decrease in power consumption in power trading. , 31), and a power threshold setting unit (32) having a power threshold set to the same value as the discharging threshold and charging threshold of the auxiliary power source (11), which are set to the same value in advance in the power regulating equipment (1). a virtual received power calculation unit (33) that calculates virtual received power by adding a target value of the auxiliary power source (11) to the power threshold; The present invention is characterized in that it includes a virtual received power output unit (35) that outputs to the control device of the power adjustment equipment in place of the value of .

[2] In the power trading support device according to [1] above, the target value acquisition unit determines the target value of the auxiliary power source based on a demand response command specifying a value of discharge power or a value of charging power of the auxiliary power source. an individual control target value calculation unit that calculates a value, a demand response command specifying a value of the amount of increase or reduction of the received power, and a value of the received power at the power receiving point to calculate a target value of the auxiliary power source. The target value of the auxiliary power source calculated by the individual control target value calculation unit or the power reception point control target value calculation unit may be acquired.

[3] In the power trading support device according to [1] or [2] above, the virtual received power output unit replaces the value of the received power at the power receiving point with the value of the virtual received power at the power adjustment facility. The power generation device may further include a virtual received power output permission unit that permits output to the control device.

[4] In the power trading support device according to any one of [2] or [3] above, the frequency deviation, which is the difference between the power supply frequency and the reference frequency at the power receiving point, is calculated from the first power value, which is the power value. further comprising a frequency deviation correction unit that calculates a second frequency deviation correction value by converting the frequency deviation correction value into a frequency deviation correction value and adding a predetermined offset value to the first frequency deviation correction value,
The individual control target value calculation unit may include a command value adjustment 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.

[5] In the power trading support device according to any one of [1] to [4] above, when the received power at the power receiving point exceeds the contract power, the control device of the power adjustment equipment The power receiving apparatus may further include a contract power excess prevention unit that inputs the value of the received power at the power receiving point without inputting the value of the received power.

[6] The power trading support method according to the representative embodiment of the present invention is capable of supplying power to a load that receives power from the outside via a power receiving point, separately from the power from the outside. The auxiliary power source and the value of the received power at the power receiving point are input, and the value of the discharge 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 discharge power of the received power is controlled. A power trading support method for adapting power adjustment equipment to power trading, comprising: a control device that controls the value of charging power of the auxiliary power source so that the value does not exceed a predetermined charging threshold; a first step of obtaining a target value of the auxiliary power source based on a demand response command requesting an increase or decrease in power usage in a transaction; and discharging the auxiliary power source set to the same value in advance in the power adjustment equipment. a second step of setting a power threshold with the same value as the threshold and the charging threshold; a third step of calculating virtual received power by adding the target value of the auxiliary power source to the power threshold; and a third step of calculating the virtual received power. The method is characterized by including a fourth step of outputting a power value to the control device of the power adjustment equipment in place of the value of the received power at the power 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 addition, in the following description, the same reference numerals are given to the same component in each embodiment, and repeated description is omitted.

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

The power trading device 100 is installed on the premises of a consumer, for example, and controls storage battery storage in response to a demand response command (hereinafter also referred to as a "DR command") transmitted from a resource aggregator or the like that constitutes a virtual power plant. This is a system that enables power trading by controlling power to increase (positive watts) or decrease (negawatts) the received power.

Here, the virtual power plant refers to a general power transmission and distribution company or a retail electricity company. A resource aggregator is an operator that controls power resources by directly concluding virtual power plant service contracts with consumers.

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

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

As shown in FIG. 1, the storage battery system 1 includes a control device 10, a storage battery 11, and a power converter 12. The storage battery system 1 has two operating modes: a charging mode in which the storage battery 11 is charged, and a discharge mode in which the storage battery 11 is discharged. In the charging mode, the storage battery system 1 operates so that the charging power of the storage battery 11 changes according to the received power, and in the discharging mode, it operates so that the discharged power of the storage battery 11 changes according to the received power.

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

The power conversion unit 12 is controlled by a control device 10 described later, and mutually converts power between the storage battery 11, the load 2, and the grid. The power converter 12 is, for example, an AC/DC converter. For example, in the charging mode, the power conversion unit 12 converts alternating current power (AC) from a power receiving point into direct current power (DC) and supplies it to the storage battery 11 in response to an instruction from the control device 10, and in the discharging mode, , converts DC power from the storage battery 11 into AC power and supplies it to the load 2 in accordance with instructions from the control device 10 . 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 to the power receiving point from the outside (grid) (power receiving point power) can be reduced. It becomes possible.

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

As shown in FIG. 1, the control device 10 includes a discharge control section 14, a charging control section 15, and a power adjustment value output section as functional blocks for realizing a function of adjusting discharge power and charging power of the storage battery 11. 16. These functional blocks are, for example, a program processing device (e.g., 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 a storage device, and performs input/output processing. This is achieved by controlling peripheral circuits such as I/F circuits and timers. In this 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 received power value and the power Pc value of the storage battery 11.

In this embodiment, power when the storage battery 11 is discharging (discharged power) Pc is expressed as a positive value, and power when the storage battery 11 is charging (charging power) Pc is expressed as 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 a discharge power adjustment value Pda, which is a 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, details of the discharge control section 14 will be explained.

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

The discharge threshold setting unit 140 sets a discharge threshold PA. Here, the discharge threshold PA is a threshold value for limiting the amount of discharge of the storage battery 11 so that the received power at the power receiving point does not exceed the customer's contract power when the storage battery 11 is discharged. In the storage battery system 1, the discharge power Pc of the storage battery 11 is adjusted based on the discharge threshold PA.

As the discharge threshold PA, for example, a value based on the customer's contract power 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. Note that the discharge threshold value PA is not limited to one, and a plurality of discharge threshold values may be set so that it is possible to select which threshold value is to be used for control.

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 reception point does not exceed the discharge threshold PA.

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

The output limiting unit 142 receives the discharge power adjustment value Pda calculated by the discharge power adjustment value calculation unit 141, and determines whether the input discharge power adjustment value Pda is a positive value (for example, a value in the range from +9999 to 0). In some cases, the input discharge power adjustment value Pda is output as is, and in the case where the discharge power adjustment value Pda is a negative value, the discharge power adjustment value Pda is output as "0".

The charging control unit 15 controls the charging power of the storage battery 11 in the charging mode. Charging control unit 15 calculates charging power adjustment value Pca, which is a target value of charging power for storage battery 11, based on the value of load power PLB calculated by load power calculating unit 13.

Next, details of the charging control section 15 will be explained.

The charging control unit 15 monitors the value of the load power PLB, and adjusts the charging power adjustment value Pca so that the value of the load power PLB does not exceed a preset threshold (hereinafter also referred to as "charging threshold") PB. calculate. Specifically, the charging control section 15 includes a charging threshold setting section 150, a charging power adjustment value calculating section 151, an output limiting section 152, and a maximum value selecting section 153.

Charging threshold setting section 150 sets charging threshold PB. Here, the charging threshold value PB is a threshold value for limiting the charging amount of the storage battery 11 so that the received power at the power receiving point does not exceed the contract power of the customer when charging the storage battery 11. In the storage battery system 1, the charging power Pc of the storage battery 11 is adjusted based on the charging threshold value PB.

As the charging threshold value PB, for example, a value based on the customer's contract power is set. For example, by setting the charging threshold value PB to a value lower than the contract power, the storage battery system 1 can operate with a margin. Note that the number of charging threshold values PB is not limited to one, and a plurality of charging threshold values PB may be set so that it is possible to select which threshold value is to be based on which control is performed.

Charging power adjustment value calculation section 151 calculates 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 power receiving point does not exceed the charging threshold value PB.

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

The output limiting unit 152 receives the charging power adjustment value Pca calculated by the charging power adjustment value calculating unit 151, and sets the input charging power adjustment value Pca to a negative value (for example, a value in the range from -9999 to 0). If so, the input charging power adjustment value Pca is output as 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 receives 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 the 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 -2000kW and the charging power adjustment value Pca calculated by the charging power adjustment value calculation unit 151 is -3000kW, the maximum value selection unit 153 selects the charging power setting value Pcst (=-2000kW ) is output as the charging power adjustment value Pca. The charging power adjustment value Pca output from the maximum value selection section 153 is input to the power conversion section 12 via the power adjustment value output section 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 power receiving point (power of the load 2) is sufficiently higher than the charging threshold value PB. Even if the charging power of the storage battery 11 is low and a large amount of charging is possible for the storage battery 11, the charging power of the storage battery 11 is limited to the charging power setting 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 charging 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 section 14 is input, the power adjustment value output section 16 outputs the discharge power adjustment value Pda to the power conversion section 12 and controls the charging. When the charging power adjustment value Pca input from the unit 15 is input, the charging power adjustment value Pca is outputted to the power converting unit 12 .

The power conversion unit 12 controls charging and discharging of the storage battery 11 according to the power adjustment value input from the power adjustment value output unit 16 . The power converter 12 controls discharging 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 controls the discharge of the storage battery 11 so that the charging power of the storage battery 11 matches the charging power adjustment value Pca in the charge mode. The charging of the storage battery 11 is controlled so as to match.

Next, the power trading support device 3 will be explained.

Instead of the target value of the feedback system in the existing storage battery system 1 described above, the power trading support device 3 determines the power trading based on the value specified by the DR command value (value specified by demand response) that is the trigger for power trading. This is a device that controls the storage battery system 1 using the obtained value as a new target value. In this embodiment, the DR command (negawatt command) to decrease the power at the power receiving point or discharge the storage battery 11 is expressed as a positive value, and the DR command (positive wattage command) to increase the power at the power receiving point or charge the storage battery 11 is expressed as a negative value. It shall be expressed as the value of .

The power trading support device 3 includes, as hardware resources, a processor such as a CPU, various storage devices such as RAM and ROM, a timer (counter), an A/D conversion circuit, a D/A conversion circuit, The computer includes a program processing device (for example, a microcontroller) having a configuration in which peripheral circuits such as an input/output I/F circuit are connected to each other via a bus. The power trading support device 3 also includes a communication interface, a communication circuit, and the like for wired or wireless communication with a host device such as a resource aggregator and the storage battery system 1, for example. Furthermore, the power trading support device 3 may have some or all of its functions implemented by a hardware logic circuit or the like.

As shown in FIG. 1, the power trading support device 3 includes an individual device control section 30, a power receiving point control section 31, and a power receiving point control section 31 as functional blocks for realizing a function of supporting power trading using the storage battery system 1. A threshold setting unit 32, a virtual received power calculation unit 33, a virtual received power adjustment unit 34, a virtual received power output unit 35, an erroneous charging prevention unit 36, a frequency droop control unit (frequency deviation correction unit) 37, The contract power excess prevention unit 38 is also included.

The individual device control unit 30 and the power receiving point control unit 31 acquire a target value of the storage battery 11 based on a demand response command that requests an increase or decrease in power consumption in power trading.

The DR command of this embodiment includes one that includes the discharge power value or the charging power value of the storage battery 11 as a DR command value (first DR command value), and one that includes the discharge power value based on the received power at the power receiving point. In some cases, the DR command value (second DR command value) includes the value or the value of the charging power. The first DR command value is a value that directly specifies the output of the storage battery 11, whereas the second DR command value is based on the past power usage of the consumer, which is called the baseline. This is a value that specifies the power to be increased or decreased based on the received power at the power receiving point estimated by

In the power trading support device 3 of this embodiment, the mode in which the DR command value is processed by the individual device control unit 30 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. Equipped with switching means. In the power trading support device 3 of this embodiment, the two modes are switched by the switching means which sets the mode to the first mode when the DR command value is the first DR command value and switches to the second mode when the DR command value is the second DR command value. By switching, the configuration is such that the first DR command value is processed by the individual device control unit 30, and the second DR command value is processed by the power receiving point control unit 31.

Here, the switching means will be explained. The individual device control section 30 is provided with a first mode changeover switch SW1, and the power reception point control section 31 is provided with a 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 when one is ON (closed state), the other is OFF (open state). The individual device control section 30 and the power reception point control section 31 are configured so that only one of them functions by means of a first mode changeover switch SW1 and a second mode changeover switch SW2.

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

The switching SW has two inputs n1 and n2, one input n1 is inverted by a NOT gate, one output is branched into two outputs Out1 and Out2, and one output Out2 is inverted by the 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 DR is being activated is input to the input n1, and a signal indicating whether 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. Input n1 is brought to a high state during DR activation, and input n2 is brought to a high state when in the first mode. The two outputs Out1 and Out2 are OFF (open state) in a Low state, and ON (closed state) in a High state. Here, the operation of the switching SW will be explained assuming that the Low state is "0" and the High state is "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 becomes "ON" and the second mode changeover switch SW2 becomes "OFF".

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

Returning to FIG. 1, the individual device control unit 30 calculates a target value of discharge power or a target value of charging power of the storage battery 11 when the DR command includes the first DR command value. The individual device control section 30 includes a command value adjustment section 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 a target value for 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 received 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 charging power of the storage battery 11 according to the DR command, but in this embodiment, the target value of the storage battery 11 is calculated in order to execute frequency droop. The correction value of is input, and the target value of the storage battery 11 is calculated by subtracting it.

The power reception point control unit 31 calculates a target value of discharge power or a target value of charging power of the storage battery 11 when the DR command includes the second DR command value. The power reception point control section 31 includes a baseline addition section 311, a power reception point power subtraction section 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 a target value of the storage battery 11 based on the DR command value. The power reception point control unit 31 outputs the calculated target value of the storage battery 11 to the virtual received power calculation unit 33.

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

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

In the power threshold setting unit 32, the same value as the discharge threshold PA and the charging threshold PB is set as a 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 received power calculation unit 33 adds it to the power threshold PD and calculates the virtual received power PjB. Similarly, when the target value of the storage battery 11 calculated by the power reception point control unit 31 is input, the virtual received power calculation unit 33 calculates the virtual received power PjB by adding it from the power threshold PD. The virtual received power calculation unit 33 outputs the calculated virtual received power PjB to the virtual received power adjustment unit 34.

The virtual received power adjustment unit 34 adjusts the virtual received power PjB with the output of the storage battery 11 and outputs it to the virtual received power output unit 35 when the DR command includes the first DR command value. When the DR command includes the second DR command value, the virtual received power adjustment unit 34 outputs the received virtual received power PjB to the virtual received power output unit 35 as is. Specifically, the virtual received power adjustment unit 34 has a first mode changeover switch SW1, and when the first mode changeover switch SW1 is ON, the value of the output of the storage battery 11 is input, and the received virtual power adjustment unit 34 receives the received virtual power. Add to power PjB.

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

The erroneous charging prevention unit 36 is configured such that the virtual received power output unit 35 outputs the value of the virtual received power PjB to the control device 10 of the storage battery system 1 instead of the received power measured value PjA only while the power trading support device 3 is in operation. Allow to output. Specifically, for example, a switching unit 361 that allows input of the value of virtual received power PjB and a switching unit that allows input of the value of measured received power PjA are provided to two input units of the virtual received power output unit 35. 362, a switch 363 and a NOT gate 364 that input a signal that causes only the switching unit 361 to be active while the power trading support device 3 is in operation, and only the switching unit 362 to be active while the power trading support device 3 is not operating. can do. By switching the input to the virtual received power output unit 35, the erroneous charging prevention unit 36 changes the output of the virtual received power output unit 35 to virtual received power PjB or It is only necessary to be able to switch to either the received power measured value PjA, and the virtual received power output section 35 itself may have the function of the erroneous charging prevention section 36.

In the power trading device 100 of this embodiment, it is necessary to set the storage battery system 1 to charging mode and make the charging control unit 15 function. However, if a received power measurement value PjA smaller than the value set as the charging threshold PB is input before the start of the operation according to the DR command, the storage battery 11 will not be charged even though there is no need to charge it. It ends up. In order to prevent this, the erroneous charging prevention unit 36 can be switched so that the received power measurement value PjA smaller than the charging threshold PB is not input to the control device 10 after the charging mode is set. In that case, before switching the storage battery system 1 to the charging mode, it is necessary to use the erroneous charging prevention unit 36 to switch the mode while the power trading support device 3 is in operation.

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 a first frequency deviation correction value, which is a power value, and a predetermined offset value is set to the first frequency deviation correction value. is added to calculate the second frequency deviation correction value.

The frequency droop control unit 37 can implement a so-called governor-free function that increases the output when the power supply frequency decreases and decreases the output when the power supply frequency increases when executing power trading.

The contract power excess prevention unit 38 adjusts the received power measurement value PjA so that it does not exceed the contract power as a result of the storage battery system 1 being controlled by the virtual 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, a correction value is calculated such that the contract power difference value becomes 0. The correction value is added by the virtual received power adjustment unit 34 when calculating the adjustment value of the virtual received power PjB.

Next, the operation of the power trading device according to the first embodiment will be explained using figures.

3 to 7 are timing charts showing changes in power before and after the start (activation) of the operation according to the DR command in the power trading device 100 of FIG. 1. The timing charts shown in FIGS. 3 to 7 show changes in the load power PL, the received power measurement value PjA, the received power correction value (virtual received power PjB), and the storage battery output Pc. Since the power trading device 100 operates differently depending on the DR command value included in the DR command, each operation will be explained 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, charging threshold PB, and power threshold PD of the control device 10 of the storage battery system 1 to the same value in advance before the power trading support device 3 operates. At the same time, in order to put the storage battery system 1 into the charging mode, the charging power setting value Pcst is set to, for example, -2000 kW. 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 specifying the value of charging power of storage battery 11)
FIG. 3 is a timing chart when the DR command includes a first DR command value that sets the charging power value of the storage battery 11 to 500 kW.

As shown in FIG. 3, before starting (invoking) the operation according to the DR command, the virtual received power calculation unit 33 calculates 7000 kW set as the power threshold PD as the virtual received power PjB, and uses the received power correction value as the received 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 according to the DR command is started, the individual device control unit 30 calculates -500kW based on the first DR command value included in the DR command, and the virtual received power calculation unit 33 calculates -500kW. The virtual received power PjB is calculated as 6500 kW. At this time, the storage battery output Pc is still 0 kW, so the virtual received power output unit 35 outputs 6500 kW (received power correction value).

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

Charging power adjustment value calculation unit 151 similarly calculates charging power adjustment value Pca to be −500 kW. The maximum value selection unit 153 receives -500kW of the charging power adjustment value Pca output from the output limiting unit 152 and -2000kW of the charging power setting value Pcst, so the maximum value of -500kW is selected. , is output to the power adjustment value output section 16.

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

Thereafter, the virtual received power calculation unit 33 calculates the virtual received power PjB to be 6500 kW, but the virtual received power adjustment unit 34 adjusts the virtual received power PjB of 6500 kW to -500 kW of the storage battery output Pc. Specifically, the virtual received power PjB is adjusted to 7000 kW by subtracting -500 kW of the storage battery output Pc from the virtual received power PjB of 6500 kW. The virtual received power output unit 35 outputs 7000 kW (received power correction value).

Having received the virtual received power PjB of 7000 kW, the control device 10 adds the 7000 kW of the virtual received power PjB input in the load power calculation unit 13 and -500 kW of the storage battery output Pc, and sets the load power value PLB to 6500 kW. calculate. The discharge power adjustment value calculating section 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 section 142 obtains 0 kW. 0 kW is input to the power adjustment value output section 16 as the discharge power adjustment value Pda.

Charging power adjustment value calculation unit 151 similarly calculates charging power adjustment value Pca to be −500 kW. The maximum value selection unit 153 receives -500kW of the charging power adjustment value Pca output from the output limiting unit 152 and -2000kW of the charging power setting value Pcst, so the maximum value of -500kW is selected. , is output to the power adjustment value output section 16.

The power adjustment value output section 16 outputs -500 kW of the charging power adjustment value Pca input from the charging control section 15 to the power conversion section 12. The power converter 12 controls the storage battery 11 to perform 500kW charging according to the power adjustment value input from the power adjustment value output unit 16, and the storage battery output Pc is controlled to -500kW. In this way, by controlling the storage battery output Pc to -500kW, 500kW of positive wattage was achieved.

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

As shown in FIG. 4, before the start (invocation) of the operation according to the DRDR command, the virtual received power calculation unit 33 calculates 7000 kW set as the power threshold PD as the virtual received power PjB, and uses the received power correction value as the received 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 the virtual received power PjB as 500 kW based on the first DR command value included in the DR command, and the virtual received power calculation unit 33 calculates the virtual received power PjB as 7500 kW. It is calculated as follows. At this time, the storage battery output Pc is still 0 kW, so the virtual received power output unit 35 outputs 7500 kW (received power correction value).

Upon receiving the virtual received power PjB of 7500 kW, the control device 10 uses the discharge power adjustment value calculation unit 141 to calculate the discharge power adjustment value Pda to be 500 kW. The calculated discharge power adjustment value Pda of 500 kW is input to the power adjustment value output section 16.

Charging power adjustment value calculating section 151 similarly calculates charging power adjustment value Pca to be 500 kW, but output limiting section 152 calculates it to 0 kW. The maximum value selection unit 153 receives 0 kW of the charging power adjustment value Pca output from the output limiting unit 152 and −2000 kW of the charging power setting value Pcst, so the maximum value of 0 kW is selected and the power It is output to the adjustment value output section 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 500kW according to the power adjustment value input from the power adjustment value output unit 16, the storage battery output Pc becomes 500kW.

Thereafter, the virtual received power calculation unit 33 calculates the virtual received power PjB as 7500 kW, but the virtual received power adjustment unit 34 adjusts the virtual received power PjB of 7500 kW with the storage battery output Pc of 500 kW. Specifically, the virtual received power PjB is adjusted to 7000 kW by subtracting 500 kW of the storage battery output Pc from the virtual received power PjB of 7500 kW. The virtual received power output unit 35 outputs 7000 kW (received power correction value).

Upon receiving the virtual received power PjB of 7000 kW, the control device 10 adds the 7000 kW of the virtual received power PjB input in the load power calculation unit 13 and the 500 kW of the storage battery output Pc, and calculates the load power value PLB as 7500 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 7000 kW from the load power value PLB of 7500 kW. The calculated discharge power adjustment value Pda of 500 kW is input to the power adjustment value output section 16.

Charging power adjustment value calculating section 151 similarly calculates charging power adjustment value Pca to be 500 kW, but output limiting section 152 calculates it to 0 kW. The maximum value selection unit 153 receives 0 kW of the charging power adjustment value Pca output from the output limiting unit 152 and −2000 kW of the charging power setting value Pcst, so the maximum value of 0 kW is selected and the power It is output to the adjustment value output section 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. In this way, by controlling the storage battery output Pc to 500 kW, a negawatt of 500 kW is realized.

(When the load suddenly increases at the first DR command value that specifies the charging power value of the storage battery 11)
, FIG. 5 is a timing chart when the load suddenly increases from 6000 kW to 7700 kW while controlling according to the DR command that includes the first DR command value that sets the charging power value of the storage battery 11 to 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 charging at 500 kW. When the load increases to 7,700 kW in this state, the received power measurement value PjA rapidly increases to 8,200 kW.

When the received power measurement value PjA rapidly increases to 8200kW, it exceeds the contract power value 7500kW, so the contract power excess prevention unit 38 subtracts the contract power value 7500kW from the received power measurement value PjA of 8200kW, and the difference value 700kW is 0. Calculate the correction value such that The correction value is added by the virtual received power adjustment unit 34 when calculating the adjustment value of the virtual received power PjB. As a result, the storage battery output Pc is controlled to 200 kW so that the received power measurement value PjA becomes 7500 kW. That is, the storage battery output Pc will be discharged at 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 specifying that the received power be 500 kW higher than the baseline power.

As shown in FIG. 6, at the start of the operation according to the DR command (before activation), the virtual received power calculation unit 33 calculates 7000 kW set as the power threshold PD as the virtual received power PjB, and uses the received power correction value as the received 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 adds the baseline value to the second DR command value of 500 kW based on the second DR command value included in the DR command. Add 5200 kW as BL to calculate a baseline additional value of 5700 kW.

The receiving point power subtraction unit 312 subtracts the baseline addition value of 5,700 kW from the received power measurement value PjA of 5,000 kW to calculate the target value of the charging power of the storage battery 11 as −700 kW.

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

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

Charging power adjustment value calculation unit 151 similarly calculates charging power adjustment value Pca to be −700 kW. The maximum value selection unit 153 receives -700kW of the charging power adjustment value Pca output from the output limiting unit 152 and -2000kW of the charging power setting value Pcst, so the maximum value of -700kW is selected. , is output to the power adjustment value output section 16.

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

Thereafter, as the storage battery output Pc becomes -700 kW, the received power measurement value PjA increases to 5700 kW, although there is no change in the load. Due to this increase, the receiving point power subtraction unit 312 subtracts the baseline addition value 5700 kW from the received power measurement value PjA 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 becomes 0 kW, the virtual received power calculation unit 33 calculates the virtual received power PjB as 7000 kW, and the virtual received power output unit 35 outputs 7000 kW (received power correction value).

The control device 10, which has received the virtual received power PjB of 7000 kW, adds the 7000 kW of the virtual received power PjB input in the load power calculation unit 13 and -700 kW of the storage battery output Pc, and sets the value PLB of the load power to 6300 kW. calculate. The discharge power adjustment value calculating section 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 section 142 obtains 0 kW. 0 kW is input to the power adjustment value output section 16 as the discharge power adjustment value Pda.

Charging power adjustment value calculation unit 151 similarly calculates charging power adjustment value Pca to be −700 kW. The maximum value selection unit 153 receives -700kW of the charging power adjustment value Pca output from the output limiting unit 152 and -2000kW of the charging power setting value Pcst, so the maximum value of -700kW is selected. , is output to the power adjustment value output section 16.

The power adjustment value output section 16 outputs -700 kW of the charging power adjustment value Pca input from the charging control section 15 to the power conversion section 12. The power converter 12 controls the storage battery 11 to perform 700kW charging according to the power adjustment value input from the power adjustment value output unit 16, and the storage battery output Pc is controlled to -700kW. In this way, by controlling the storage battery output Pc to -700kW, the received power measurement value PjA is controlled to 5700kW. Since the baseline value BL is 5200kW, this means that 500kW of posiwatts has been achieved.

(Second DR command value that specifies the value of 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 specifying that the received power be 500 kW less than the baseline power.

As shown in FIG. 7, at the start of the operation according to the DR command (before activation), the virtual received power calculation unit 33 calculates 7000 kW set as the power threshold PD as the virtual received power PjB, and uses the received power correction value as the received 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 adds the baseline value to the second DR command value −500kW based on the second DR command value included in the DR command. A value of 5200 kW is added to calculate a baseline additional value of 4700 kW.

The receiving point power subtraction unit 312 subtracts the baseline addition value of 4,700 kW from the received power measurement value PjA of 5,000 kW to calculate the target value of the discharge power of the storage battery 11 as 300 kW.

The virtual received power calculation unit 33 adds the power threshold PD of 7000 kW and the target value of the discharge power of the storage battery 11 of 300 kW, and calculates the virtual received power PjB as 7300 kW. At this time, the storage battery output Pc is still 0 kW, so the virtual received power output unit 35 outputs 7300 kW (received power correction value).

Upon receiving the virtual received power PjB of 7300 kW, the control device 10 uses the discharge power adjustment value calculation unit 141 to calculate the discharge power adjustment value Pda to be 300 kW. The calculated discharge power adjustment value Pda of 300 kW is input to the power adjustment value output section 16.

Charging power adjustment value calculating section 151 similarly calculates charging power adjustment value Pca to be 300 kW, but output limiting section 152 calculates it to 0 kW. The maximum value selection unit 153 receives 0 kW of the charging power adjustment value Pca output from the output limiting unit 152 and −2000 kW of the charging power setting value Pcst, so the maximum value of 0 kW is selected and the power It is output to the adjustment value output section 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 converter 12 controls the storage battery 11 to discharge 300kW in accordance with the power adjustment value input from the power adjustment value output unit 16, the storage battery output Pc becomes 300kW.

Thereafter, as the storage battery output Pc becomes 300 kW, the received power measurement value PjA decreases to 4700 kW, although there is no change in the load. Due to this decrease, the receiving point power subtraction unit 312 subtracts the baseline addition value of 4700 kW from the 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 becomes 0 kW, the virtual received power calculation unit 33 calculates the virtual received power PjB as 7000 kW, and the virtual received power output unit 35 outputs 7000 kW (received power correction value).

Upon receiving the virtual received power PjB of 7000 kW, the control device 10 adds the virtual received power PjB of 7000 kW input in 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 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 section 16.

Charging power adjustment value calculating section 151 similarly calculates charging power adjustment value Pca to be 300 kW, but output limiting section 152 calculates it to 0 kW. Maximum value selection section 153 receives 0 kW of charging power adjustment value Pca output from output limiting section 152 and -2000 kW of charging power setting value Pcst, so the maximum value of 0 kW is selected and the power It is output to the adjustment value output section 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. In this way, by controlling the storage battery output Pc to 300 kW, the received power measurement value PjA is controlled to 4700 kW. Since the baseline value BL is 5200kW, this means that a negawatt of 500kW has been achieved.

In this way, the power trading support device 3 according to the present embodiment is configured so that the DR command value included in the DR command is the value of the discharge power or the charging power of the storage battery 11 as the DR command value (first DR command value). , or when the discharge power value or charging power value based on the received power at the power receiving point is the DR command value. Since the output can be controlled, it is possible to realize power trading in accordance with a wide range of DR commands.

Furthermore, existing storage battery systems (an example of power adjustment equipment) are often configured to be digitally connected to core systems, and devices that digitally connect to the storage battery system from the outside are being avoided from a security perspective. The power trading support device of this embodiment only provides analog input values 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.

(Expansion of embodiment)
Although the invention made by the present inventors has been specifically explained based on the embodiments above, 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 has been described in which the contract power excess prevention unit 38 is provided in the input unit of the virtual received power adjustment unit 34. However, as shown in FIG. 8, a contract power excess prevention section 38 is provided immediately after the input section for the DR command value, which is configured to prevent the DR command value included in the DR command from being processed when the contract exceeds the contract. You can.

For example, in the above embodiments, the configuration of a power trading device in which a power trading support device is incorporated into a 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 a 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 can be additionally provided with means for starting the generator. As a means of starting the generator, in the case of a method of starting with a starting signal, a method of inputting a starting signal to the generator can be adopted, and a method in which a threshold value is set so that the generator is in the starting state In this case, it is possible to adopt means for applying a pulse that exceeds a threshold value set at the time of starting the generator.

DESCRIPTION OF SYMBOLS 100... Power trading device, 1... Storage battery system, 10... Control device, 11... Storage battery, 12... Power converter, 13... Load power calculation part, 14... Discharge control part, 140... Discharge threshold value setting part, 141... Discharge power Adjustment value calculating section, 142... Output limiting section, 15... Charging control section, 150... Charging threshold setting section, 151... Charging power adjustment value calculating section, 152... Output limiting section, 153... Maximum value selection section, 16... Power adjustment Value output unit, 2... Load, 3... Power trading support device, 30... Individual device control unit, 31... Power receiving point control unit, 32... Power threshold setting unit, 33... Virtual received power calculation unit, 34... Virtual received power adjustment Section, 35... Virtual received power output section, 36... Erroneous charging prevention section, 37... Frequency droop control section, 38... Contract power excess prevention section

Claims (6)

An auxiliary power source that can supply power separately from the external power to a load that receives power from the outside via the power receiving point, and the value of the received power at the power receiving point are input, and the received power is The value of the discharging power of the auxiliary power source is controlled so that the value of does not exceed a predetermined discharge threshold, and the value of the charging power of the auxiliary power source is controlled so that the value of the received power does not exceed a predetermined charging threshold. A power trading support device that can be connected to power adjustment equipment equipped with a control device that controls the
a target value acquisition unit that acquires a target value of the auxiliary power source based on a demand response command requesting an increase or decrease in power consumption in power trading;
a power threshold setting unit having a power threshold set to the same value as a discharge threshold and a charge threshold of the auxiliary power source, which are set to the same value in advance in the power adjustment equipment;
a virtual received power calculation unit that calculates virtual received power by adding a target value of the auxiliary power source to the power threshold;
a virtual received power output unit that outputs the calculated virtual received power value to the control device of the power adjustment equipment in place of the received power value at the power receiving point;
A power trading support device comprising: The power trading 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 specifying a value of discharge power or a value of charging power of the auxiliary power source; a power receiving point control target value calculation unit that calculates a target value of the auxiliary power source based on a demand response command specifying a value of the amount of increase or reduction in power and a value of received power at the power receiving point; A power trading support device characterized by acquiring a target value of an auxiliary power source calculated by a control target value calculation unit or a power receiving point control target value calculation unit. The power trading support device according to claim 1 or 2,
The virtual received power output permission unit further includes a virtual received power output permission unit that allows the virtual received power output unit to output the value of the virtual received power to the control device of the power adjustment equipment instead of the value of the received power at the power reception point. A power trading support device comprising: The power trading support device according to claim 2 or claim 3 citing claim 2,
Converting a frequency deviation that is a difference between a power supply frequency and a reference frequency at the power receiving point into a first frequency deviation correction value that is a power value, and adding a predetermined offset value to the first frequency deviation correction value. further comprising a frequency deviation correction section that calculates a second frequency deviation correction value,
The individual control target value calculation unit includes a command value adjustment 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 equipment. The power trading support device according to any one of claims 1 to 4,
When the received power at the power receiving point exceeds the contract power, the value of the received power at the power receiving point is inputted to the control device of the power adjustment equipment without inputting the value of the virtual received power, thereby preventing excess of contract power. A power trading support device further comprising: An auxiliary power source that can supply power separately from the external power to a load that receives power from the outside via the power receiving point, and the value of the received power at the power receiving point are input, and the received power is The value of the discharging power of the auxiliary power source is controlled so that the value of does not exceed a predetermined discharge threshold, and the value of the charging power of the auxiliary power source is controlled so that the value of the received power does not exceed a predetermined charging threshold. A power trading support method for adapting power adjustment equipment equipped with a control device for power trading, the method comprising:
A first step of obtaining a target value of the auxiliary power source based on a demand response command requesting an increase or decrease in power usage in the power transaction;
a second step of setting a power threshold value that is the same as a discharge threshold value and a charge threshold value of the auxiliary power source that are previously set to the same value in the power adjustment equipment;
a third step of calculating virtual received power by adding a target value of the auxiliary power source to the power threshold;
a fourth step of outputting the calculated virtual received power value to the control device of the power adjustment equipment in place of the received power value at the power receiving point;
A power trading support method characterized by comprising:

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