JP2019201453A - Power supply system and power management method - Google Patents

Abstract

To enable easy change of a setting value of a PCS.SOLUTION: A power supply system (100) according to a representative embodiment of the present invention includes a distributed power source (11) which can be connected to a power system, a power control device (12) which controls power supply from the distributed power source to the power system on the basis of a set setting value (200), and an external server (2) which monitors the state of the power system and can communicate with the power control device. The power control device is configured to be able to change the setting value through the external server.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a power supply system and a power management method, for example, a power supply system and a power management method in which a distributed power source is connected to a power system.

  In recent years, power supply systems in which distributed power sources are connected to a power system have been put into practical use. In this power supply system, distributed power sources such as photovoltaic power generation facilities and power storage facilities installed in each consumer are connected to the power system via a power conditioning system (hereinafter also referred to as “PCS”). (For example, refer to Patent Document 1).

  The PCS controls the DC power output from the solar power generation facility and the power storage facility, and controls the DC power to be converted into AC power and supplied to the distribution line. In general, the PCS operates according to a preset set value.

  Here, the settling value is setting information for regulating the operation of the PCS. For example, setting values of overvoltage (voltage upper limit value) and overcurrent (current upper limit value), isolated operation prevention function, voltage ride through Various information for realizing functions, frequency ride-through functions, and the like are included.

  The set value is determined by grid coordination discussions and grid interconnection rules between general electric utilities (for example, electric power companies) and installers of distributed power sources, and basically does not change after the PCS is installed. However, if a change is necessary, the administrator must go to the installation location and change the PCS setting value one by one.

Japanese Patent Laid-Open No. 2017-200266

  As described above, in the power supply system using the distributed power source, the operation of the PCS is restricted by the set value. For example, in general, when a large-scale power supply (commercial power supply) is dropped due to a system fault or the like, and the frequency or phase of the power system changes greatly, the PCS is caused by the inertial force of a generator or the like connected to the power system. A function for stopping the supply of power from the distributed power source to the distribution line until the supply power is stabilized (a function for preventing independent operation) is set as a set value. For example, the PCS stops supplying power from the distributed power source to the distribution line until the frequency of the power system falls within a predetermined range with respect to a reference frequency (for example, 50 Hz or 60 Hz).

  However, if distributed power supplies become more widespread in the future, the functions of the distributed power supply will not be limited when a grid fault occurs as in the past, but the power supply system will be actively utilized. Operation that aims to stabilize is necessary. For this purpose, the inventor of the present application considered that a mechanism for enabling the PCS settling value to be appropriately changed according to the situation is necessary.

  The present invention has been made in view of the above-described problems, and an object thereof is to make it possible to easily change the PCS settling value.

  A power supply system according to a representative embodiment of the present invention controls a power supply from the distributed power source to the power system based on a distributed power source that can be connected to the power system and a set set value. A power control device that monitors the status of the power system and an external server that can communicate with the power control device, and the power control device can change the settling value by the external server. It is configured.

  According to the power supply system of the present invention, the PCS settling value can be easily changed.

It is a figure which shows the structure of the electric power supply system which concerns on Embodiment 1. FIG. It is a figure which shows the functional block structure of the electric power supply system which concerns on Embodiment 1. FIG. 3 is a flowchart showing a flow of a power management method by the power supply system according to the first embodiment. It is a figure which shows an example of the frequency fluctuation | variation in an electric power grid | system. It is a figure which shows the functional block structure of the electric power supply system which concerns on Embodiment 2. FIG. It is a figure which shows an example of the function for calculating the variation | change_quantity (DELTA) P of the active power which should be supplied to a power grid from a distributed power supply. It is a figure which shows another example of the function for calculating the variation | change_quantity (DELTA) P of the active power which should be supplied to a power grid from a distributed power supply. It is a figure which shows another example of the function for calculating change amount (DELTA) P of the active power which should be supplied to an electric power grid | system from a distributed power supply. 6 is a flowchart showing a flow of a power management method by the power supply system according to the second embodiment. FIG. 10 is a diagram illustrating a functional block configuration of a power supply system according to a third embodiment. It is a figure which shows an example of the frequency fluctuation | variation in an electric power grid | system. FIG. 10 is a diagram for explaining a method of calculating an active power change amount ΔP by the power supply system according to the third embodiment.

1. 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 the drawings corresponding to constituent elements of the invention are shown in parentheses.

  [1] A power supply system (100, 100A, 100B) according to a representative embodiment of the present invention includes a distributed power source (11) that can be connected to a power system (3), and a settling value (200) ) And a power control device (12, 12A, 12B) that controls the supply of power from the distributed power source to the power system, and monitors the state of the power system and can communicate with the power control device The power control device is configured to be capable of changing the settling value by the external server.

  [2] In the power supply system, the set value includes power supply availability information (201) indicating whether power can be supplied from the distributed power source to the power system, and the power control device includes the power supply When a first value is set in the availability information, power can be supplied from the distributed power source to the power system, and a second value different from the first value is set in the power supply availability information. The power supply from the distributed power source to the power system may be restricted.

  [3] In the power supply system, the external server may change the set value of the power control device according to a state of the power system.

  [4] In the power supply system, the external server monitors the stability indicating the stability of the power system, and when the stability falls below a predetermined reference value, the power supply of the power control device. The first value may be set in the availability information.

  [5] In the power supply system, the stability is a phase difference of the power system, and the external server monitors the phase difference for each area in the power system, and the stability in at least one of the areas. When the phase difference exceeds a predetermined threshold, at least the first value is set in the power supply availability information of the power control device installed in the area where the phase difference exceeds the predetermined threshold. Good.

  [6] In the power supply system (100A, 100B), the power control device, when the first value is set in the power supply availability information, based on the amount of change in the physical quantity of the power system, Power may be supplied from the distributed power source to the power system.

  [7] In the power supply system (100A, 100B), the physical quantity may include at least one of a frequency and a voltage of the power system.

  [8] In the power supply system (100A), the power control device (12A) is configured based on a function (204, 204_1 to 204_3) representing a relationship between the change amount of the physical quantity and the change amount of the active power. You may calculate the variation | change_quantity of the said active power which should be supplied to the said electric power grid | system from a distributed power supply.

  [9] In the power supply system (100A), the power control device (12A) is configured to control the active power to be supplied from the distributed power source to the power system based on the function specified by the external server. The amount of change may be calculated.

  [10] In the power supply system (100B), the power control device (12B) calculates the change amount of the active power to be output next so as not to exceed the change amount of the active power calculated immediately before. May be.

  [11] A power management method according to a representative embodiment of the present invention controls a distributed power source (11) connectable to a power system (3), and supply of power from the distributed power source to the power system. A power management method using a power supply system including a power control device (12) that performs communication and an external server (2) capable of communicating with the power control device, wherein the external server sets the power control device A setting value changing step (S2, S3) for changing the value, and a power control step for controlling the power supply from the distributed power source to the power system by the power control device based on the changed setting value ( S4).

  [12] In the power management method, the set value includes power supply availability information (201) indicating whether power can be supplied from the distributed power source to the power system, and in the power control step, the power control When the first value is set as the power supply availability information, the device is enabled to supply power from the distributed power source to the power system, and the second value is set as the power supply availability information. The power supply from the distributed power source to the power system may be restricted.

  [13] In the power management method, the external server further includes a monitoring step (S1) in which the state of the power system is monitored, and the settling value changing step is performed according to the state of the power system. A step of changing the set value of the power control device may be included.

  [14] In the power management method, the monitoring step includes a step in which the external server monitors the stability indicating the stability of the power system, and the setting value changing step includes a step in which the stability is a predetermined standard. A step of setting the first value in the power supply availability information of the power control device when the value is lower than the value may be included.

  [15] In the power management method, the stability is a phase difference of the power system, and in the monitoring step, the external server calculates the phase difference for each area (7_1 to 7_n) in the power system. The setting value changing step includes the step of monitoring, wherein, in the monitoring step, when the phase difference in at least one of the areas exceeds a predetermined threshold, the external server is configured so that at least the phase difference is the predetermined value. A step of setting the first value in the power supply availability information of the power control device installed in the area exceeding the threshold may be included.

  [16] In the power management method, in the power control step, when the first value is set in the power supply availability information, the power control device is configured based on a change amount of a physical quantity of the power system. The power calculation step (S4A) for calculating the power to be supplied from the distributed power source to the power system, and the power supply from the distributed power source to the power system based on the calculation result of the power calculation step And a power supply step (S5A).

  [17] In the power management method, the physical quantity may include at least one of a frequency and a voltage of the power system.

  [18] In the power management method, the power calculation step is performed based on a function (204, 204_1 to 204_3) in which the power control device represents a relationship between the change amount of the physical quantity and the change amount of the active power. A step of calculating a change amount of the active power to be supplied from the distributed power source to the power system may be included.

  [19] In the power management method, the set value changing step includes a step (step S2A) in which the external server designates the function, and the power calculation step is designated by the power control device by the external server. A step of calculating a change amount of the active power to be supplied from the distributed power source to the power system based on the function that has been performed may be included.

  [20] In the power management method, the power control device may calculate a change amount of the active power to be output next so as not to exceed a change amount of the active power calculated immediately before.

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 are given to components common to the respective embodiments, and repeated description is omitted.

<< Embodiment 1 >>
FIG. 1 is a diagram illustrating a configuration of a power supply system according to the first embodiment.
The power supply system 100 shown in the figure is a distributed power system in which distributed power sources such as solar power generation facilities and power storage facilities are connected to an electric power system.

  The power supply system 100 includes a plurality of consumers 1, an external server 2, and a distribution line 3. The distribution line 3 is supplied with electric power from a substation (not shown), and is connected to a plurality of consumers 1 and a large-scale power source (not shown).

  Each consumer 1 is supplied with power from the distribution line 3 and can supply power to the distribution line 3. The consumer 1 is a general consumer in which a household solar power generation facility, a power storage facility, or the like is installed, or a high-pressure private customer in which a mega solar is installed.

  Each consumer 1 has a distributed power source 11, a power control device 12, a distribution board 13, and a load 14.

  The distributed power source 11 includes, for example, a photovoltaic power generation facility (PV) 111 and a power storage facility 112. The photovoltaic power generation facility 111 is a device that generates DC power based on light energy.

  The power storage facility 112 is a device that stores power, for example, stores power generated by the solar power generation facility 111.

  The power control device 12 is a PCS (Power Conditioning System). Hereinafter, the power control device 12 is also referred to as “PCS 12”. The PCS 12 includes, for example, a DC / DC converter, an AC / DC converter, various switch circuits, a program processing device such as a microcontroller, and hardware resources such as a communication device.

  The PCS 12 controls DC power output from the distributed power source 11 (solar power generation equipment 111 and power storage equipment 112), converts the DC power into AC power, and converts the power system (distribution) through the distribution board 13. Control to supply to the electric wire 3) is performed. In addition, the PCS 12 converts AC power supplied from the power system via the distribution board 13 into DC power and supplies it to the power storage facility 112.

  The PCS 12 can communicate with the external server 2 via the communication network 5. Examples of the communication network 5 include various wireless communication networks such as a wireless LAN, and various wired communication networks such as optical communication using optical fibers and power line communication (PLC).

  The PCS 12 is preset with a set value, and operates according to the set value. On the other hand, the PCS 12 is configured such that the set value can be changed in accordance with a command from the external server 2.

  The distribution board 13 is connected to the distribution line 3. For example, the distribution board 13 is connected to the distribution line 3 via a lead-in line connected to the secondary side of the pole transformer 4 having the distribution line 3 connected to the primary side. The distribution board 13 supplies the power supplied from the distribution line 3 via the pole transformer 4 to the load 14 and also supplies it to the PCS 12. In addition, the distribution board 13 supplies the power supplied from the distributed power source 11 via the PCS 12 to the distribution line 3 via the pole transformer 4.

  The load 14 is a device that operates based on the power supplied via the distribution board 13.

  The external server 2 is a functional unit that performs overall control of the entire power supply system 100 and monitors the state of the power system. For example, the external server 2 is installed in a place different from the facility of the customer 1 and controls the PCS 12 of each customer 1 via the communication network 5. For example, the external server 2 changes the set value of the PCS 12 installed in each consumer 1 as necessary.

  For example, the external server 2 monitors the state of the power system for each of the areas 7_1 to 7_n (n is an integer of 2 or more) obtained by dividing the power system. In the present embodiment, as an example, a case where the power system is divided into a plurality of areas 7_1 to 7_n for each pole transformer 4 will be described. However, the method of dividing the areas 7_1 to 7_n is not limited to this. Absent.

Next, specific configurations of the PCS 12 and the external server 2 will be described.
FIG. 2 is a diagram illustrating a functional block configuration of the power supply system according to the first embodiment. In the figure, functional block configurations of the PCS 12 and the external server 2 are shown.

First, the PCS 12 will be described.
As illustrated in FIG. 2, the PCS 12 includes a command receiving unit 121, a power output control unit 122, a storage unit 123, a physical quantity detection unit 124, and a power conversion unit 125.

  The power conversion unit 125 converts power between the distribution line 3, the solar power generation facility 111, and the power storage facility 112 connected via the distribution board 13, and the distribution line 3, the solar power generation facility 111, This is a functional unit that controls transmission / reception of electric power to / from the power storage facility 112. Specifically, the power conversion unit 125 bidirectionally converts between AC power (AC) and DC power (DC), and power is supplied between the solar power generation equipment 111, the power storage equipment 112, and the distribution line 3. Give and receive. The power converter 125 includes, for example, a DC / DC converter, an AC / DC converter, and various switch circuits.

  The command receiving unit 121, the power output control unit 122, the storage unit 123, and the physical quantity detection unit 124 are realized by, for example, a computer system (embedded system) including a microcontroller and peripheral circuits. That is, the command receiving unit 121, the power output control unit 122, the storage unit 123, and the physical quantity detection unit 124 are configured such that a processor such as a CPU executes various calculations according to a program stored in a storage device such as a RAM or a ROM. This is realized by controlling the circuit.

  The program is a program for realizing the power management method according to the present embodiment, and is installed in advance in a storage device in the PCS 12, for example.

  Note that the program may be distributed via a network, or may be distributed by being written on a computer-readable storage medium (Non-transitory computer readable medium) such as a CD-ROM. .

  The command receiving unit 121 is a functional unit that receives commands from the external server 2. The command receiving unit 121 receives various commands output from the command transmitting unit 22 of the external server 2 described later via the communication network 5. In FIG. 2, the communication network 5 is not shown.

  The physical quantity detection unit 124 is a functional unit that monitors the physical quantity of the distribution line 3 (power system) via the distribution board 13. For example, the physical quantity detection unit 124 detects the frequency and voltage of the distribution line 3 (power system) via a sensor device (not shown).

  The power output control unit 122 drives the power conversion unit 125 according to the set value set in the PCS 12, thereby converting and transferring power between the photovoltaic power generation facility 111, the power storage facility 112, and the distribution line 3. Is a functional unit for controlling

  The storage unit 123 is a functional unit that stores various data such as programs and parameters necessary for realizing the function as the PCS 12. For example, the storage unit 123 stores the set value information 200 as information necessary for the PCS 12 to execute the power management method according to the present embodiment.

  The set value information 200 includes information such as an overvoltage (voltage upper limit value) 202 and an overcurrent (current upper limit value) 203 that are conventionally known as PCS set values, as well as the power system (distribution) from the distributed power source 11. Power supply availability information 201 indicating whether power supply to the electric wire 3) is possible is included.

  The power supply availability information 201 includes a first value (for example, “1”) indicating that power supply from the distributed power source 11 to the power system (distribution line 3) is permitted, or a power system (distribution) from the distributed power source 11. A second value (for example, “0”) indicating that power supply to the electric wire 3) is restricted is set. For example, the second value is set in the power supply availability information 201 in the initial state after activation of the PCS 12.

  When the second value is set in the power supply availability information 201, the power output control unit 122 limits the supply of power from the solar power generation facility 111 and the power storage facility 112 to the distribution line 3. For example, the power output control unit 122 controls the power conversion unit 125 to stop the output of power from the solar power generation facility 111 and the power storage facility 112 to the distribution line 3.

  On the other hand, when the first value is set in the power supply availability information 201, the power output control unit 122 controls the power conversion unit 125 as necessary, from the solar power generation facility 111 or the power storage facility 112. Power is supplied to the distribution line 3.

  When the first value is set in the power supply availability information 201, the power output control unit 122, for example, from the distributed power source 11 based on the physical quantity of the power system (distribution line 3) detected by the physical quantity detection unit 124. Control power supply to the power grid.

  Here, the physical quantity of the power system can be exemplified by the frequency and voltage of the power system. In the present embodiment, as an example, the physical quantity is described as being the frequency of the power system.

  For example, the power output control unit 122 first calculates the difference between the detected physical quantity and the reference physical quantity as the amount of change in the physical quantity. Then, the power output control unit 122 calculates a change amount ΔP of the active power to be output from the distributed power supply 11 based on the calculated change amount of the physical quantity. Specifically, as one of the set value information 200, a function 204 for calculating a change amount ΔP of active power to be supplied from the distributed power source to the power system is stored in the storage unit 123, and power output control is performed. The unit 122 calculates the change amount ΔP of the active power from the change amount of the physical quantity based on the function 204 stored in the storage unit 123.

  Here, the function 204 is a relationship (ΔP−) between the change amount of the physical quantity of the power system (frequency change amount Δf) and the change amount ΔP of the active power to be supplied from the distributed power source 11 to the power system (distribution line 3). (Δf characteristic).

  The power output control unit 122 drives the power conversion unit 125 so that the active power corresponding to the change amount ΔP calculated as described above is output from the distributed power source 11 to the distribution line 3. As a result, power is supplied from the distributed power source 11 to the power system.

  As described above, the set value information 200 of the PCS 12 can be changed by the external server 2. That is, the command receiving unit 121 of the PCS 12 updates the set value information 200 in accordance with a command output from a command transmitting unit 22 described later of the external server 2.

Next, the external server 2 will be described.
As illustrated in FIG. 2, the external server 2 includes a power system monitoring unit 21 and a command transmission unit 22 as functional units for realizing the power management method according to the present embodiment. The power system monitoring unit 21 and the command transmission unit 22 perform various operations according to a program stored in a storage device such as a RAM or a ROM in an information processing device by a processor such as a CPU in the external server 2 as an information processing device. This is realized by controlling the peripheral circuit.

  The above program is a program for realizing the power management method according to the present embodiment, and is installed in a storage device in the external server 2 in advance, for example.

  Note that the program may be distributed via a network, or may be distributed by being written on a computer-readable storage medium (Non-transitory computer readable medium) such as a CD-ROM. .

  The power system monitoring unit 21 is a functional unit that monitors the state of the power system in the power supply system 100. The power system monitoring unit 21 monitors the stability indicating the stability of the power system, and determines the stability of the power system by comparing the stability with a predetermined reference value.

  Examples of the stability include power system reserve power, power system inertial force, and power system phase difference Δφ.

  Here, the reserve capacity of the power system is the remaining capacity of the power generation capacity in the power system for continuing stable power supply even when an accident or the like occurs in the power system.

  For example, the power system monitoring unit 21 calculates the reserve capacity of the power system based on information such as the power generation capacity and the current power generation amount in the monitored power system, and compares the calculated reserve capacity with the reference value of the reserve capacity. By doing so, the stability of the power system to be monitored is determined.

  In addition, the inertia of the power system refers to the ability of the power system to continue supplying desired power even when one large-scale power supply is dropped due to an accident or the like occurring in the power system.

  For example, the power system monitoring unit 21 calculates the inertial force of the power system to be monitored based on the power generation capacity and load information in the power system to be monitored, and calculates the calculated inertial force and the reference value of the inertial force. By comparing, the stability of the power system to be monitored is determined.

  The phase difference of the power system is a difference between the voltage phase of each area 7_1 to 7_n (n is an integer of 2 or more) and the reference phase in the power system. Here, the reference phase is, for example, the phase of the output voltage of the generator serving as a reference for the power system.

  For example, the power system monitoring unit 21 calculates the phase difference for each of the areas 7_1 to 7_n, and compares the calculated phase difference with the reference value of the phase difference to determine the stability of the power system to be monitored.

  Here, it is preferable that the stability of the power system can be determined in stages. For example, a plurality of reference values for stability (for example, reserve power, inertial force, and phase difference) are provided, and the stability of the power system to be monitored is determined according to the magnitude relationship between the calculated stability and each reference value. The sex may be determined by level. For example, threshold values Th1, Th2, and Th3 (Th3> Th2> Th1) are provided as reference values for the phase difference, and the power system monitoring unit 21 determines the threshold values Th1, Th2, Th3 and the calculated phase difference Δφ. By comparing, the stability of the power system may be judged in stages.

  The command transmission unit 22 is a functional unit that outputs a command to the PCS 12. Specifically, the command transmission unit 22 outputs a command for changing the set value of the PCS 12. For example, the command transmission unit 22 outputs a command for updating the set value information 200 of the PCS 12 according to the state of the power system to be monitored.

  More specifically, when the power system monitoring unit 21 determines that the stability of the power system to be monitored has decreased below a predetermined reference value, the command transmission unit 22 serves as the power supply availability information 201 of the PCS 12. A command for setting the first value is transmitted to the PCS 12 via the communication network 5.

Next, the flow of the power management method by the power supply system 100 according to Embodiment 1 will be described.
FIG. 3 is a flowchart showing a flow of the power management method by the power supply system 100 according to the first embodiment.

First, the external server 2 determines whether or not it is necessary to change the set values of the PCS 12 in each of the monitored areas 7_1 to 7_n (step S1). For example, the external server 2 determines whether or not the setting value of the PCS 12 needs to be changed by determining whether or not the state of the power system (distribution line 3) is stable.
Specifically, as described above, the power system monitoring unit 21 monitors the stability of the power system (power system reserve power, inertial force, phase difference Δφ of each area 7_1 to 7_n, etc.) and It is determined whether the degree is lower than a predetermined reference value (for example, Th1, Th2, and Th3).

  In step S1, when the stability is higher than a predetermined reference value, the external server 2 determines that the power system is stable, and determines that it is not necessary to change the set values of the PCS 12 in each area 7_1 to 7_n. In this case, the external server 2 does not instruct each PCS 12 to switch the power supply availability information 201. That is, each PCS 12 operates according to the already set power supply availability information 201.

On the other hand, when the stability is lower than the predetermined reference value in step S1, the external server 2 determines that the power system is unstable, and changes the set value with respect to the PCS 12 in the desired areas 7_1 to 7_n. Is transmitted via the communication network 5 (step S2).
Specifically, the command transmission unit 22 outputs a command for permitting power supply from the distributed power source 11 to the power system (distribution line 3) to the PCS 12 via the communication network 5. For example, as described above, when the phase difference Δφ of the area 7_1 is larger than the threshold Th1 and smaller than the threshold Th2, the command transmission unit 22 supplies power from the distributed power supply 11 to each PCS 12 existing in the area 7_1. Sends a command to permit power supply to the grid.

  After step S2, the command receiving unit 121 of the PCS 12 that has received the command from the command transmitting unit 22 sets a first value in the power supply availability information 201 according to the command (step S3).

  The PCS 12 in which the first value is set in the power supply availability information 201 supplies power from the distributed power source 11 to the power system as necessary (step S4). Specifically, the power output control unit 122 of the PCS 12 uses the function 204 to calculate the change amount ΔP of the active power that should be output from the distributed power source 11 from the change amount Δf of the frequency, and to the calculated change amount ΔP. The power converter 125 is driven so that the corresponding effective power is output from the distributed power source 11 to the distribution line 3.

  In the case of the above-described example, the power output control unit 122 of each PCS 12 existing in the area 7_1 calculates the change amount ΔP of the active power based on the change amount Δf of the frequency of the power system detected by the physical quantity detection unit 124. The power converter 125 is driven so that the active power corresponding to the changed amount ΔP is output from the distributed power source 11 to the distribution line 3.

  As described above, the power supply system 100 according to the first embodiment includes the distributed power source 11 that can be connected to the power system (distribution line 3), and the power supply from the distributed power source 11 to the power system based on the set value. The PCS 12 that controls the supply and the external server 2 that monitors the state of the power system and is communicable with the PCS 12 are configured so that the external server 2 can change the settling value.

  According to this, since the external server 2 can change the set value of each PCS 12 via the communication network 5, the set value of the PCS can be changed as appropriate according to the situation. Further, according to the power supply system 100, it is not necessary for an administrator to go to the installation place of the PCS 12 and change the set values of the PCS 12 one by one as in the conventional case. That is, according to the power supply system 100, the set value of the PCS 12 can be easily changed.

  In the power supply system 100, the set value (set value information 200) of the PCS 12 includes power supply availability information 201 that indicates whether power can be supplied from the distributed power source 11 to the power system (distribution line 3). In addition, when the first value (for example, “1”) is set in the power supply availability information 201, the PCS 12 can supply power from the distributed power source 11 to the power system. Is set to a second value (for example, “0”), the supply of power from the distributed power source 11 to the power system is restricted.

  According to this, by changing the power supply availability information 201 as a set value of the PCS 12, it is possible to control the availability of power supply from the distributed power source 11 to the power system from the external server 2.

  Further, when the external server 2 changes the power supply availability information 201 of the PCS 12 according to the state of the power system, the power of the power system to which the distributed power source is connected becomes unstable. It is possible to stabilize the system.

  In other words, a general PCS is very advantageous for stabilizing the power system because it can change the output of power at a higher speed than a generator or the like. On the other hand, a distributed power source is always used according to frequency fluctuations of the power system. If the control for supplying power is performed, the power system may become unstable due to unnecessary output increase or power supply exceeding the total amount of necessary power.

Therefore, as described above, the external server 2 in the power supply system 100 monitors the stability (the power system reserve, inertial force, or phase difference) indicating the stability of the power system, and the stability is a predetermined value. When it falls below the reference value, the first value is set in the power supply availability information 201 of the PCS 12.
According to this, it is possible to achieve stabilization of the power system by performing control so that power is supplied from the distributed power source 11 to the power system only when the state of the power system becomes unstable. .

  In the power supply system 100, the stability is the phase difference of the power system, and the external server 2 monitors the phase difference for each of the areas 7_1 to 7_n in the power system, and the level in at least one area 7_1 to 7_n. When the phase difference exceeds a predetermined threshold, the first value is set in the power supply availability information 201 of the PCS 12 installed in the areas 7_1 to 7_n at least where the phase difference exceeds the predetermined threshold.

  According to this, since the supply power can be stabilized in a pinpoint manner in an area where the power supply in the power system is unstable, the power is supplied by excessively supplying power from the distributed power source 11. It becomes possible to prevent the system from becoming unstable.

  Furthermore, in the power supply system 100, when the first value is set in the power supply availability information 201, the PCS 12 supplies power from the distributed power supply 11 to the power system based on the change amount of the physical quantity of the power system. Do.

  According to this, even if, for example, a large-scale power supply (commercial power supply) is dropped due to a grid fault or the like and the frequency of the power system fluctuates greatly, the PCS 12 actively operates and the physical quantity of the power system is reduced. Since power is supplied from the distributed power supply 11 to the power system according to the amount of change, it is possible to quickly stabilize the power of the power system.

FIG. 4 is a diagram illustrating an example of frequency fluctuations in the power system.
In the figure, the vertical axis represents the frequency variation Δf of the power system, and the horizontal axis represents time t. Reference numeral 500 indicates a time change (estimated value) of the frequency change amount Δf when the frequency of the power system varies in the power supply system 100 according to the present embodiment. Reference numeral 501 denotes a frequency of a power system in a conventional distributed power supply system that does not have a function of changing a set value of a power control device (PCS) as a comparative example of the power supply system 100 according to the present embodiment. Shows the time change (estimated value) of the frequency change amount Δf when fluctuates.

  As indicated by reference numeral 501 in the figure, when the power of the power system becomes unstable, in the conventional distributed power supply system, the power supply from the distributed power supply 11 to the power system is stopped. The power of the system is gradually recovered by the inertial force of the power supply source other than the distributed power source 11 connected to the power system.

  On the other hand, as indicated by reference numeral 500 in the figure, in the power supply system 100 according to the first embodiment, when the power of the power system becomes unstable, the distributed power source 11 applies power to the power system. Since electric power is supplied according to the amount of change Δf in frequency, it can be expected that the electric power of the electric power system is quickly recovered as compared with the conventional distributed power supply system.

  As described above, when the power system becomes unstable due to a system fault or the like, it is possible to quickly stabilize the power system by actively operating the PCS. On the other hand, when the power system is stable, the PCS 12 can control the power supply from the distributed power supply 11 to the power system so as not to be supplied according to the frequency change amount Δf. It is possible to prevent the power system from becoming unstable due to unnecessary output increase from the distributed power source 11 and power supply exceeding the total amount of necessary power.

In the power supply system 100, the PCS 12 calculates the amount of change in active power that should be supplied from the distributed power source 11 to the power system based on the function 204 that represents the relationship between the amount of change in physical quantity and the amount of change in active power. To do.
According to this, the change amount of the active power to be supplied from the distributed power source 11 to the power system can be easily calculated from the detected change amount of the physical quantity (for example, frequency or voltage).

<< Embodiment 2 >>
FIG. 5 is a diagram illustrating a functional block configuration of the power supply system according to the second embodiment.
The power supply system 100A according to the second embodiment is different from the power supply system 100 according to the first embodiment in that the function for calculating the effective power to be supplied from the distributed power source to the power system can be changed. However, the other points are the same as those of the power supply system 100 according to the first embodiment.

  The PCS 12A in the power supply system 100A according to the second embodiment has a plurality of functions for calculating the change amount ΔP of the active power to be supplied from the distributed power source to the power system, which is one of the set value information 200. The function used by the command from the external server 2 can be switched.

  For example, a plurality of functions 204_1 to 204_3 as illustrated in FIGS. 6A to 6C are stored in the storage unit 123A of the PCS 12A.

6A to 6C are diagrams illustrating an example of a function for calculating the change amount ΔP of the active power to be supplied from the distributed power source 11 to the power system.
FIG. 6A shows a function 204_1 as an example of a function stored in the storage unit 123A. The function 204_1 does not change the active power change amount ΔP from the distributed power source 11 to the distribution line 3 when the frequency change amount Δf of the distribution line 3 is in the range of (f1-1) to (f1 + 1). When the frequency change amount Δf of the distribution line 3 exceeds (f1-1) and (f1 + 1), the active power change amount ΔP is linearly and gently changed with respect to the frequency change amount Δf. Has characteristics.

  FIG. 6B shows a function 204_2 as another example of the function stored in the storage unit 123A. The function 204_2 does not change the change amount ΔP of the active power from the distributed power supply 11 to the distribution line 3 when the change amount Δf of the frequency of the distribution line 3 is in the range of (f2-1) to (f2 + 1). When the frequency change amount Δf of the distribution line 3 exceeds (f2-1) and (f2 + 1), the active power change amount ΔP changes linearly and steeply with respect to the frequency change amount Δf. Have.

  FIG. 6C shows a function 204_3 as still another example of the function stored in the storage unit 123A. When the frequency change amount Δf of the distribution line 3 is in the range of (f3-1) to (f3 + 1), the function 204_3 linearly and gently changes the active power change amount ΔP with respect to the frequency change amount Δf. When the frequency change amount Δf of the distribution line 3 exceeds (f3-1) and (f3 + 1), the active power change amount ΔP is linearly and sharply changed with respect to the frequency change amount Δf. Has characteristics.

  The storage unit 123A of the PCS 12A stores a plurality of functions 204_1 to 204_3 and the like as illustrated in FIGS. 6A to 6C, and the power output control unit 122 selects any one of the functions 204_1 to 204_3 stored in the storage unit 123A. The amount of change ΔP of the active power to be supplied from the distributed power source 11 to the power system is calculated using The function to be used is specified by the function designation information 205, for example.

  The function designation information 205 is information indicating a function to be used for calculating the change amount ΔP of the active power to be supplied from the distributed power source 11 to the power system, and is stored in the storage unit 123A as one of the set value information 200. Has been. The power output control unit 122 reads the function specified by the function specifying information 205 from the storage unit 123A, and calculates the change amount ΔP of the active power to be supplied from the distributed power source 11 to the power system.

The function designation information 205, the functions 204_1 to 204_3, etc. of the PCS 12A can be changed by a command from the external server 2, similarly to the power supply availability information 201 described above.
Specifically, the command transmission unit 22 of the external server 2 outputs a command for specifying the function 204 to the PCS 12A together with a command for permitting power supply from the distributed power source 11 to the power system. Upon receiving these commands, the command receiving unit 121 of the PCS 12A sets “first value” in the power supply availability information 201 and sets a value indicating the function 204 specified by the external server 2 in the function specifying information 205. To do.

  For example, in the power supply system 100A shown in FIG. 5, when the command transmission unit 22 of the external server 2A transmits a command specifying the function 204_2 to the PCS 12A, the command reception unit 121 of the PCS 12A specifies the value indicating the function 204_2 as a function. Information 205 is set.

  Here, the external server 2A may determine the function 204 to be specified according to the state of the power system to be monitored. For example, as described above, the power system monitoring unit 21 uses “phase difference” as an index for determining the stability of the power system, and the threshold values Th1, Th2, and Th3 are set as reference values for the phase difference. Think.

  If the power system monitoring unit 21 determines that the phase difference Δφ of the area 7_1 of the power system is larger than the threshold value Th1 and smaller than the threshold value Th2 (Th1 <Δφ <Th2), the command transmission unit 22 A command for permitting power supply from the distributed power source 11 to the power system is output to the PCS 12A of each customer 1 and, for example, a function 204_1 in which the amount of variation in active power relative to the amount of variation in frequency is relatively gradual is specified. Command to output.

  When the power system monitoring unit 21 determines that the phase difference Δφ of the power system to be monitored is larger than the threshold value Th2 and smaller than the threshold value Th3 (Th2 <Δφ <Th3), the command transmission unit 22 A command for permitting power supply from the distributed power source 11 to the power system is output to the PCS 12A of each customer 1 of 7_1, and the amount of variation in active power with respect to the amount of variation in frequency is larger than the function 204_1, for example. A command for specifying the function 204_2 is output.

  In addition, when the power system monitoring unit 21 determines that the phase difference Δφ of the power system to be monitored is larger than the threshold Th3 (Th3 <Δφ), the command transmission unit 22 sets the PCS 12A of each customer 1 in the area 7_1. In addition, a command for permitting power supply from the distributed power source 11 to the power system is output, and for example, a command for designating a function 204_3 having a larger amount of variation in active power with respect to a frequency variation than the function 204_2 is output.

  As described above, the external server 2A may determine the function 204 to be specified according to the state of the power system to be monitored.

  The power output control unit 122A of the PCS 12A reads the function 204 designated by the function designation information 205 from the storage unit 123A, and outputs the function 204 from the frequency change amount Δf of the power system (distribution line 3) using the read function 204. A change amount ΔP of the effective active power is calculated. For example, when the function 204_2 is designated by the function designation information 205, the power output control unit 122A calculates the change amount ΔP of the active power based on the function 204_2 read from the storage unit 123A. The power output control unit 122 </ b> A drives the power conversion unit 125 so that active power corresponding to the calculated change amount ΔP is output from the distributed power source 11 to the distribution line 3.

  In order to output power from the distributed power source 11 when ΔP> 0, for example, there is a power storage facility 112 that stores power, and the photovoltaic power generation facility 111 suppresses the output, and the output The precondition is that there is an available power reserve (reserve).

  In order to output power from the distributed power source 11 when ΔP <0, for example, the power storage facility 112 can store power, the solar power generation facility 111 can suppress output, and The precondition is that power consumption by the load 14 is possible.

Next, a flow of a power management method performed by the power supply system 100A according to Embodiment 2 will be described.
FIG. 7 is a flowchart showing a flow of a power management method performed by the power supply system 100A according to the second embodiment.

  First, the external server 2A determines whether or not it is necessary to change the set value of the PCS 12A in each of the monitored areas 7_1 to 7_n (step S1). A specific determination method is the same as the determination method by the external server 2 described above.

  In step S1, if the stability is higher than a predetermined reference value, the external server 2A determines that the power system is stable, and determines that it is not necessary to change the set values of the PCS 12A in each area 7_1 to 7_n. In this case, the external server 2 does not instruct each PCS 12A to switch the power supply availability information 201.

  On the other hand, when the stability is lower than the predetermined reference value in step S1, the external server 2A determines that the power system is unstable, and changes the set value with respect to the PCS 12 in the desired areas 7_1 to 7_n. Is transmitted via the communication network 5 (step S2A).

  Specifically, the command transmission unit 22 outputs a command for permitting power supply from the distributed power source 11 to the power system (distribution line 3) and a command for specifying the function 204 to the PCS 12A via the communication network 5. To do. For example, as described above, when the phase difference Δφ of the area 7_1 is larger than the threshold Th1 and smaller than the threshold Th2, the command transmission unit 22 supplies power from the distributed power supply 11 to each PCS 12A existing in the area 7_1. A command for permitting power supply to the system and a command for specifying the function 204 are transmitted.

  After step S <b> 2 </ b> A, the command receiving unit 121 of the PCS 12 </ b> A that has received the command from the command transmitting unit 22 sets the first value in the power supply availability information 201 according to the command and is specified in the function specifying information 205. The value of the function 204 is set (step S3A).

  Next, the power output control unit 122A of the PCS 12A in which the first value is set in the power supply availability information 201 uses the function 204 specified by the function specifying information 205 to determine whether the distributed power source 11 is based on the frequency change Δf. A change amount ΔP of the active power to be output is calculated (step S4A).

  Next, the power output control unit 122A supplies power from the distributed power source 11 to the power system based on the calculation result in step S4A (step S5A). Specifically, the power output control unit 122A drives the power conversion unit 125 so that the active power corresponding to the change amount ΔP calculated in step S4A is output from the distributed power source 11 to the distribution line 3.

  In the above example, when a value specifying the function 204_3 is set in the function specifying information 205 of each PCS 12A existing in the area 7_1, the power output control unit 122A of each PCS 12A existing in the area 7_1 uses the function 204_3. Thus, the change amount ΔP of the active power is calculated from the change amount Δf of the frequency of the power system detected by the physical quantity detection unit 124, and the active power corresponding to the calculated change amount ΔP is output from the distributed power source 11 to the distribution line 3. Thus, the power conversion unit 125 is driven.

As described above, in the power supply system 100A according to the second embodiment, the PCS 12A calculates the amount of change in active power to be supplied from the distributed power source 11 to the power system based on the functions 204_1 to 204_3 specified from the external server 2. To do.
According to this, it is possible to realize more appropriate power supply control using the distributed power source 11 for stabilizing the power system. For example, as described above, the external server 2 performs control to switch the functions 204_1 to 204_3 to be used in the PCS 12A according to the level of stability of the power system to be monitored, and thus according to the stability of the power system. It is possible to control supply of appropriate active power from the distributed power source 11 to the power system, and it is possible to further stabilize the power system.

<< Embodiment 3 >>
FIG. 8 is a diagram illustrating a functional block configuration of the power supply system according to the third embodiment.
The power supply system 100B according to Embodiment 3 is implemented in that an upper limit value is set for the calculated active power change ΔP when calculating the active power change ΔP output from the distributed power source to the power system. The power supply system 100A according to the second embodiment is different from the power supply system 100A according to the second embodiment, and is otherwise the same as the power supply system 100A according to the second embodiment.

  Specifically, the PCS 12B of the power supply system 100B according to the third embodiment has the first value set in the power supply availability information 201 when power supply from the distributed power source 11 to the power system is permitted. In the case), the change amount ΔP of the active power to be output from the distributed power source 11 is calculated so as not to exceed the change amount ΔP of the active power calculated immediately before.

  Hereinafter, a method for calculating the change amount ΔP of the active power by the power supply system 100B according to Embodiment 3 will be described in detail with reference to the drawings. Here, a case where a value specifying the function 204_1 illustrated in FIG. 6A is set in the function specifying information 205 will be described as an example.

FIG. 9 is a diagram illustrating an example of frequency fluctuations in the power system.
FIG. 10 is a diagram for explaining a method for calculating the amount of change ΔP in active power by the power supply system according to the third embodiment.

  First, as shown by the characteristic 502 shown in FIG. 9, it is assumed that the amount of change in the frequency of the power system is Δf1 at time t1. At this time, the power output control unit 122B of the PCS 12B calculates the change amount ΔP1 of the active power from the change amount Δf1 of the frequency of the power system as illustrated in FIG. 10 according to the function 204_1 specified by the function specifying information 205, and the change The power converter 125 is driven so that active power of the amount ΔP1 is output. At this time, the power output control unit 122B sets the calculated active power variation ΔP1 as the active power upper limit value ΔPmax, as shown in FIG. The upper limit value ΔPmax of the active power is stored as limit information 206 in the storage unit 123B.

  Next, as shown in FIG. 9, it is assumed that the amount of change in the frequency of the power system becomes Δf2 at time t2. At this time, the power output control unit 122B calculates the change amount ΔP2 of the active power to be output from the distributed power source 11 based on the limit information 206 and the function 204_1 stored in the storage unit 123B. Specifically, the power output control unit 122B first calculates the change amount ΔP2x of the active power to be output from the distributed power source 11 from the change amount Δf2 of the frequency of the power system according to the function 204_1, as shown in FIG. . Next, the power output control unit 122B compares the calculated change amount ΔP2x (absolute value) of the active power with the upper limit value ΔPmax (absolute value) stored as the limit information 206.

  In the case of ΔP2x <ΔPmax, the power output control unit 122B drives the power conversion unit 125 so that the active power of the calculated change amount ΔP2x is output, and the calculated active power change amount ΔP2x is the upper limit value of the active power. Set to ΔPmax. That is, the limit information 206 stored in the storage unit 123B is updated from ΔP1 to ΔP2x.

  On the other hand, when ΔP2x> ΔPmax, the power output control unit 122B outputs the active power of the upper limit value ΔPmax stored as the limit information 206 instead of the calculated change amount ΔP2x of the active power. Drive. In this case, the limit information 206 stored in the storage unit 123B is not updated.

  For example, in the case of FIGS. 9 and 10, since ΔPmax = ΔP1 and ΔP2x> ΔP1 at time t2 (Δf = Δf2), ΔP2x> ΔPmax. Therefore, the power output control unit 122B outputs the active power of the upper limit value ΔPmax (= ΔP1) of the active power stored as the limit information 206 instead of the calculated change amount ΔP2x of the active power. 125 is driven.

  Next, as shown in FIG. 9, it is assumed that the amount of change in the frequency of the power system becomes Δf3 at time t3. At this time, as shown in FIG. 10, the power output control unit 122B calculates a change amount ΔP3x of the active power to be output from the distributed power source 11 from the change amount Δf3 of the frequency of the power system, and changes the calculated effective power. The amount ΔP3x is compared with the upper limit value ΔPmax stored as the limit information 206.

  For example, in the case of FIGS. 9 and 10, since ΔPmax = ΔP1 and ΔP3 <ΔP1 at time t3, ΔP3 <ΔPmax. Accordingly, the power output control unit 122B drives the power conversion unit 125 so that the calculated effective amount of change ΔP3 is output, and sets the calculated effective power change amount ΔP3 to the upper limit value ΔPmax of the effective power. . That is, the limit information 206 stored in the storage unit 123B is updated from ΔP1 to ΔP3.

  The power output control unit 122B controls the effective power output from the distributed power source 11 by repeatedly performing the above-described processing.

  9 and 10, the case where the frequency change amount Δf is negative (Δf <0) has been described, but the same processing is performed when the frequency change amount Δf is positive (Δf> 0). For example, as shown in FIG. 10, the lower limit value ΔPmin is stored as the limit information 206 based on the change amount ΔP of the active power calculated immediately before, and the active power is set so as not to exceed the lower limit value ΔPmin (absolute value). The change amount ΔP is calculated, and the lower limit value ΔPmin is sequentially updated.

  As described above, according to the power supply system 100B according to the third embodiment, the change amount ΔP of the active power to be output next from the distributed power source 11 is calculated so as not to exceed the change amount ΔP of the active power calculated immediately before. Therefore, it is possible to prevent the amount of change in the frequency of the power system from oscillating repeatedly due to the power supplied from the distributed power source 11 to the power system, so that it does not converge. Thereby, it becomes possible to further prevent the power system from becoming unstable by positively supplying power from the distributed power source 11 to the power system in a situation where the power system is unstable.

<< Extended embodiment >>
As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the present invention is not limited thereto, and it goes without saying that various changes can be made without departing from the scope of the invention. .

  For example, in the above embodiment, the case where the change amount Δf of the frequency of the power system is used as the change amount of the physical quantity of the power system is exemplified. Good.

  In this case, the function 204 indicates a relationship (ΔP-ΔV characteristic) between the change amount ΔV of the voltage of the power system and the change amount ΔP of the active power to be supplied from the distributed power source 11 to the power system (distribution line 3). It becomes a function. Further, the physical quantity detection unit 124 detects the voltage of the distribution line 3 via a sensor device (not shown).

  The PCSs 12 and 12A monitor both the frequency variation Δf of the power system and the voltage variation ΔV of the power system, and based on the frequency variation Δf and the voltage variation ΔV, the active power variation amount. ΔP may be calculated respectively.

  Further, in the above embodiment, when the phase difference Δφ of the power system area 7_1 is larger than a predetermined threshold (Th1, Th2, Th3), the power supply availability information 201 ( Although the case where the command for changing the set value of the function specifying information 205) is output is exemplified, the present invention is not limited to this. For example, the command may be output not only to the area 7_1 but also to the PCS 12 existing in the area around the area 7_1 (for example, the area 7_2), or the command may be output to all the areas 7_1 to 7_n.

Moreover, in the said embodiment, although the case where the external server 2 changes the setting value of PCS12, 12A, 12B according to the state of an electric power grid | system was illustrated, the judgment criterion of the change of a setting value is the state of an electric power system. Not limited to. The external server 2 may change the set values of the PCS 12, 12A, 12B according to, for example, the weather (for example, weather forecast information), season, day of the week (weekdays or Saturdays, Sundays, and holidays), and time zone. .
For example, when the time zone in which lightning strikes are likely to occur can be predicted from the weather forecast, the external server 2 uses the PCS 12, 12A, 12B in the areas 7_1 to 7_n in which lightning strikes may occur during the time zone. In contrast, power supply from the distributed power source 11 to the power system may be permitted.

  Similarly, for the function 204, the external server 2 may designate appropriate functions 204_1 to 204_3 according to the weather, season, day of the week, time zone, and the like, and set them in the PCS 12, 12A, 12B.

  Moreover, the above-mentioned flowchart shows an example for explaining the operation, and is not limited to this. That is, the steps shown in the flowcharts are specific examples and are not limited to this flow. Specifically, the order of some processes may be changed, other processes may be inserted between the processes, and some processes may be performed in parallel.

DESCRIPTION OF SYMBOLS 1 ... Consumer, 2 ... External server, 3 ... Power system, 3 ... Distribution line, 4 ... Pole transformer, 5 ... Communication network, 7_1-7_n ... Area, 11 ... Distributed power supply, 12, 12A, 12B ... Power control device (PCS), 13 ... distribution board, 14 ... load, 21 ... power system monitoring unit, 22 ... command transmission unit, 100, 100A, 100B ... power supply system, 121 ... command reception unit, 122, 122A, 122B ... Power output control unit, 123, 123A, 123B ... Storage unit, 124 ... Physical quantity detection unit, 125 ... Power conversion unit, 200 ... Set value information, 201 ... Power supply availability information, 202 ... Overvoltage (voltage upper limit value), 203: Overcurrent (current upper limit value), 204, 204_1 to 204_3, function, 205, function designation information, 206, limit information.

Claims (20)

A distributed power source that can be connected to the power grid;
A power control device that controls the supply of power from the distributed power source to the power system based on a settling value;
While monitoring the state of the power system, comprising an external server capable of communicating with the power control device,
The power control device is configured such that the set value can be changed by the external server. The power supply system according to claim 1,
The set value includes power supply availability information indicating whether power can be supplied from the distributed power source to the power system,
When the first value is set as the power supply availability information, the power control device enables power supply from the distributed power source to the power system, and the power supply availability information is a second value. Is set, power supply from the distributed power source to the power system is restricted. The power supply system according to claim 2,
The power supply system, wherein the external server changes the set value of the power control device according to a state of the power system. The power supply system according to claim 3, wherein
The external server monitors the stability indicating the stability of the power system, and sets the first value in the power supply availability information of the power control device when the stability falls below a predetermined reference value. A power supply system characterized by that. The power supply system according to claim 4,
The stability is a phase difference of the power system,
The external server monitors the phase difference for each area in the power system, and when the phase difference in at least one area exceeds a predetermined threshold, at least the phase difference exceeds the predetermined threshold. The power supply system, wherein the first value is set in the power supply availability information of the power control device installed in the area. The power supply system according to any one of claims 2 to 5,
When the first value is set in the power supply availability information, the power control device supplies power from the distributed power source to the power system based on a change amount of a physical quantity of the power system. Power supply system characterized by The power supply system according to claim 6, wherein
The physical quantity includes at least one of a frequency and a voltage of the power system. The power supply system according to claim 6 or 7,
The power control device calculates a change amount of the active power to be supplied from the distributed power source to the power system based on a function representing a relationship between the change amount of the physical quantity and the change amount of the active power. A featured power supply system. The power supply system according to claim 8, wherein
The power control apparatus calculates a change amount of the active power to be supplied from the distributed power source to the power system based on the function designated by the external server. The power supply system according to claim 8 or 9,
The power control apparatus calculates a change amount of the active power to be output next so as not to exceed a change amount of the active power calculated immediately before. A power supply system comprising: a distributed power source connectable to a power system; a power control device that controls supply of power from the distributed power source to the power system; and an external server that can communicate with the power control device Power management method by
A setting value changing step in which the external server changes a setting value of the power control device;
The power control method includes: a power control step for controlling power supply from the distributed power source to the power system based on the changed set value. The power management method according to claim 11,
The set value includes power supply availability information indicating whether power can be supplied from the distributed power source to the power system,
In the power control step, when the first value is set as the power supply availability information, the power control device enables power supply from the distributed power source to the power system, and the power supply When the second value is set as the availability information, the power supply from the distributed power source to the power system is limited. The power management method according to claim 12, wherein
A monitoring step in which the external server monitors the state of the power system;
The set value changing step includes a step in which the external server changes the set value of the power control device in accordance with the state of the power system. The power management method according to claim 13,
The monitoring step includes a step in which the external server monitors a stability indicating the stability of the power system,
The set value changing step includes a step of setting the first value in the power supply availability information of the power control device when the stability is lower than a predetermined reference value. . The power management method according to claim 14,
The stability is a phase difference of the power system,
The monitoring step includes a step in which the external server monitors the phase difference for each area in the power system,
In the monitoring value changing step, when the phase difference in at least one of the areas exceeds a predetermined threshold value, the external server determines that the phase difference exceeds at least the predetermined threshold value in the monitoring step. A power management method comprising: setting the first value in the power supply availability information of the power control device installed in the power control apparatus. The power management method according to any one of claims 12 to 15,
The power control step includes
When the first value is set in the power supply availability information, the power control device determines power to be supplied from the distributed power source to the power system based on a change amount of a physical quantity of the power system. A power calculating step to calculate;
And a power supply step of supplying power from the distributed power source to the power system based on a calculation result obtained by the power calculation step. The power management method according to claim 16, wherein
The physical quantity includes at least one of a frequency and a voltage of the power system. The power management method according to claim 16 or 17,
In the power calculation step, the power control device changes the active power to be supplied from the distributed power source to the power system based on a function representing a relationship between the change amount of the physical quantity and the change amount of the active power. A power management method comprising a step of calculating an amount. The power management method according to claim 18,
The set value changing step includes a step in which the external server specifies the function,
The power calculation step includes a step in which the power control device calculates a change amount of the active power to be supplied from the distributed power source to the power system based on the function designated by the external server. A power management method characterized by the above. The power management method according to claim 18 or 19,
The power control method calculates a change amount of the active power to be output next so as not to exceed a change amount of the active power calculated immediately before.

Images