JP7234815B2 - power regulation system - Google Patents

Description

The present disclosure relates to a power adjustment system that adjusts power fluctuations in a power system in which a renewable energy power generation device that generates power using renewable energy and a cogeneration system are interconnected.

Conventionally, a distributed power supply system is known that includes a power line connected to a power system, a solar power generation device, a power supply device and a power load device that are connected to the power line, and a control device that controls the operation of the power supply device. (See, for example, Patent Document 1). The controller of this distributed power supply system determines the target received power for each set period, and adjusts the output power from the power supply device to the power line so that the received power from the power system to the power line becomes the target received power. In addition, when the average value of the differential power obtained by subtracting the photovoltaic power supplied to the power line by the photovoltaic power generation device from the load power of the power load device during a predetermined period in the past is equal to or greater than zero, the control device controls the target received power is determined to be zero, and when the average value of the differential power in the past predetermined period is less than zero, the target received power is determined to be the same as the average value of the differential power. As a result, even when the power generated by the photovoltaic power generation device fluctuates sharply, the power purchased from the power system is stably reduced while avoiding deterioration of the power supply and demand balance in the power system. be able to.

Also known in the prior art are energy resource networks having a plurality of energy resources each capable of supplying a predetermined amount of energy and a plurality of energy consuming devices each capable of receiving a predetermined amount of energy (e.g. , see Patent Document 2). Each energy resource of the energy resource network is associated with an energy resource processor configured to issue one or more offer messages regarding a predetermined amount of energy available for supply from the energy resource. Further, each energy consuming device is associated with an energy consuming processor configured to receive one or more offer messages for transactions to receive a predetermined amount of energy from one of the energy resources. The Energy Resource Processor and/or Energy Consumption Processor then publishes a cryptographically protected transaction record of that transaction for inclusion in a publicly available distributed ledger.

JP 2018-166379 A Japanese Patent Publication No. 2018-514850

In the distributed power supply system described in Patent Document 1, in order to reduce the influence of the output fluctuation of the photovoltaic power generation device on the power system, a power supply device including a power generation device such as a secondary battery or a fuel cell, and an air conditioner It absorbs the output fluctuations of the photovoltaic power generation system by controlling power load devices including lighting and the like. For this reason, if the power load cannot be increased even though the amount of power generated by photovoltaic power generation has increased, the output of the power supply (generator) is reduced to cope with the increase in the amount of power generated by photovoltaic power generation. will do. However, if the power generation device included in the power supply device brings about a high energy saving effect and a utility cost reduction effect by operating at the highest possible output for a long time, it is difficult to effectively utilize the power generated by photovoltaic power generation. If the output of the power supply device is reduced in order to do so, the expected energy-saving effect and the like cannot be obtained, and there is a risk that the merits of the consumer having the power generation device will rather be impaired. In addition, the technology described in Patent Document 2 aims to utilize surplus power in the power system by enabling power transactions between multiple consumers while ensuring the safety of transactions by using blockchain technology. However, it is not intended to eliminate power fluctuations in the power system associated with the energy resource or energy consuming device. On the other hand, in recent years, a large number of power generation equipment such as solar power generation equipment, wind power generation equipment, cogeneration systems that generate electricity using renewable energy, and virtual power plants that function as a single power plant. A concept called (VPP) is becoming widespread. However, a virtual power plant has an extremely complicated system configuration, and it is difficult to enable power transactions among multiple consumers while ensuring the security of transactions. It is also not easy to stabilize the power system by using

Therefore, the present disclosure enables power transactions between a plurality of consumers while ensuring the safety of transactions, and a power system in which a renewable energy power generation device that generates power using renewable energy and a cogeneration system are interconnected. The main purpose is to stabilize the

A power adjustment system of the present disclosure connects a renewable energy power generation device that generates power using renewable energy and a cogeneration system, and adjusts power fluctuations in a power system in which reverse power flow from the cogeneration system is allowed. A power regulation system, comprising: a management device for managing power transactions between a plurality of consumers in the power system, including a consumer having the cogeneration system, wherein the cogeneration system controls the Control for determining whether or not a power fluctuation has occurred, and transmitting a request to sell the generated power of the cogeneration system or a purchase request of the power of the power system to the management device when it is determined that the power fluctuation has occurred. device, wherein the management device determines whether or not the power transaction is established in response to the sale request or the purchase request from the control device, and if it is determined that the power transaction is established, at least Transmitting transaction details including a power transaction amount to the control device and holding the transaction details, the control device adjusting the generated power of the cogeneration system according to the transaction details from the management device; , to hold the contents of the transaction.

According to the power adjustment system of the present disclosure, power is sold from a consumer having a cogeneration system to another consumer when power fluctuations occur in the power system due to a decrease in the power generated by the renewable energy power generation device. is established, the power generated by the cogeneration system can be supplied to the power system to stabilize the power system. In addition, when power fluctuations occur in the power system due to an increase in the power generated by the renewable energy power generation equipment, a consumer having a cogeneration system can purchase power from other consumers, thereby It is possible to reduce the amount of power generated by the generation system and absorb the power (surplus power) generated by the renewable energy power generator, thereby stabilizing the power system. Furthermore, in the power adjustment system of the present disclosure, the details of power transactions are held in the storage device of the management device and the storage device of the cogeneration system, so power transactions (buying and selling) among a plurality of consumers are safe. can be secured well. As a result, power can be traded among a plurality of consumers while securing the safety of the trade, and the power system in which the renewable energy power generator and the cogeneration system are interconnected can be stabilized. In addition, the cogeneration system instantly determines whether or not there is a power fluctuation in the power system, and transmits a request to sell or buy power to the management device according to the determination result, so that power is generated by the renewable energy power generation device. It is possible to deal with fine fluctuations in electric power with good responsiveness.

Further, the control device increases the generated power of the cogeneration system when the management device determines that the power transaction corresponding to the sale request is established, and the management device responds to the purchase request. The generated power of the cogeneration system may be reduced when it is determined that the transaction of the generated power is established.

Further, when the voltage of the electric power system falls below an allowable range, the control device calculates the surplus power generation capacity of the cogeneration system and, if there is the surplus power generation capacity, transmits the sale request to the management device. and calculating the generated power of the cogeneration system when the voltage of the power system exceeds the allowable range, and transmitting the purchase request to the management device when the generated power is not zero. There may be. As a result, it is possible to quickly and properly detect power fluctuations in the power system using the functions provided in the cogeneration system, so it is possible to suppress an increase in cost when constructing a power adjustment system.

Further, the transaction content may be stored in a block, and the block may store information of a previous block together with the transaction content. The transaction details of a transaction may be shared. In this way, by using blockchain technology (distributed ledger technology), it is possible to ensure that transaction details (transaction history) are highly resistant to tampering, thereby further improving the safety of electricity transactions between multiple consumers. It is possible to

Further, the management device stores a minimum sale price and a maximum purchase price of power for each of the plurality of consumers, and stores the power based on the minimum sale price of the power seller and the maximum purchase price of the power buyer. It may be determined whether or not the transaction is established. As a result, when power fluctuations occur in the power system, power transactions can be easily and quickly established between a plurality of consumers.

Further, the lowest selling price when the power fluctuation of the power system occurs due to a decrease in the power generated by the renewable energy power generation device is the influence of the decrease in the power generated by the renewable energy power generation device on the power system. may be set higher than the lowest selling price when there is less. As a result, when there is a risk of destabilization of the power system due to a decrease in the power generated by the renewable energy power generation device, it is possible to reward consumers who have a cogeneration system that contributes to resolving power fluctuations. , it becomes possible to increase the merits of the consumer.

Furthermore, the cogeneration system may include a fuel cell that generates power through an electrochemical reaction between an anode gas and a cathode gas. That is, according to the power adjustment system of the present disclosure, it is possible to increase or decrease the output of the fuel cell while considering the cost, so it is possible to increase the merits of the consumer having the cogeneration system.

1 is a schematic configuration diagram showing a power regulation system of the present disclosure; FIG. 4 is a flow chart showing an example of a routine executed by the management device of the power regulation system of the present disclosure; 4 is a flow chart showing an example of a routine executed by a cogeneration system control device that constitutes the power adjustment system of the present disclosure; FIG. 2 is a schematic diagram showing an example of a power transaction mode in the power adjustment system of the present disclosure; FIG. 4 is a schematic diagram showing another example of a power transaction mode in the power adjustment system of the present disclosure;

Next, embodiments for carrying out the invention of the present disclosure will be described with reference to the drawings.

FIG. 1 is a schematic configuration diagram showing a power regulation system 10 of the present disclosure. A power adjustment system 10 shown in the figure is for adjusting power fluctuations of a power system 1 that supplies power to a plurality of residences (including apartment complexes) and a plurality of offices in a predetermined supply area. is. As shown in the figure, residences to which power is supplied from the power system 1 include residences 2 in which a cogeneration system 20 is installed, offices 3 in which a solar power generation device 30 is installed, and residences in which no power generation device is installed. 4 etc. are included. That is, the electric power system 1 is linked with a plurality of power generation devices such as the cogeneration system 20 installed in the residence 2 and the solar power generation device 30 installed in the office 3 . A smart meter 50 is installed in each of the residences 2 and 4 and the office 3 to which power is supplied from the power system 1 . The supply area of the power system 1 may be, for example, an area corresponding to one pole-mounted transformer or an area wider than that. Furthermore, the cogeneration system 20 may be installed in an office, and the photovoltaic power generation device 30 may be installed in a residence. Moreover, the power generation device interconnected with the power system 1 may include a renewable energy power generation device that generates power using renewable energy other than sunlight, such as a wind power generation device.

As shown in FIG. 1, a power adjustment system 10 is a power trading management system that manages power trading (buying and selling) between a plurality of consumers such as residences 2 and 4 and offices 3 to which power is supplied from a power system 1. A server (management device) 15 is included. The power transaction management server 15 is a computer including a CPU, a ROM, a RAM, an input/output device (all not shown), a storage device 17 for storing various information, and the like. In the storage device 17 of the power transaction management server 15, the minimum sale price (price per 1 kWh) and the maximum purchase price (price per 1 kWh) of power preset by each consumer to which power is supplied from the power system 1 are stored. are stored for each of a plurality of consumers.

Further, upon receiving a request to sell or purchase power from the consumer side, the arithmetic processing unit (CPU) of the power transaction management server 15 determines whether there is a buyer or seller of power, and determines that there is a buyer or a seller. If so, it is determined whether or not the power transaction will be concluded based on the lowest sale price of the seller and the highest purchase price of the buyer. Then, when the power transaction management server 15 determines that the power transaction is established, the power transaction management server 15 sends the details of the transaction including the transaction amount (purchase amount in response to the sale request or sale amount in response to the purchase request) and transaction price. The contents of the transaction are transmitted to the home and stored (held) in the storage device 17 . Furthermore, smart meters 50 installed in residences 2 and 4 and offices 3 within the supply area of the power system 1 are connected to the power trading management server 15 via a communication network NW, which is, for example, a P2P network. Note that the communication network NW may be a server-client network.

A cogeneration system 20 installed in a dwelling 2 includes a power generation unit 21 including, for example, a solid oxide fuel cell FC that generates power through an electrochemical reaction between an anode gas and a cathode gas, a hot water supply facility 22, a power generation unit 21 and It is a domestic cogeneration system including a control device 25 that controls the hot water supply equipment 22 . The control device 25 of the cogeneration system 20 includes a microcomputer (not shown) having a CPU, ROM, RAM, etc., and a storage device 27 that stores various data. The control device 25 controls various blowers, various pumps, various fans, and valves (not shown) of the power generation unit 21 based on signals from various sensors provided in the cogeneration system 20 and signals from a remote controller operated by the user. It outputs control signals to power conditioners (DC/DC converters and inverters), etc., and controls these devices.

Also, the control device 25 is connected to the power transaction management server 15 via the communication network NW. Furthermore, the control device 25 acquires the voltage of the power system 1 via a system power sensor (not shown), acquires the frequency of the power system 1 based on the voltage waveform, etc., and uses the acquired voltage and frequency of the power system 1. Based on this, it is determined whether power fluctuation has occurred in the power system 1 . Then, when it is determined that power fluctuation has occurred in the power system 1, the control device 25 issues a sale request for the power generated by the power generation unit 21 (cogeneration system 20) or a purchase request for power (surplus power) in the power system 1. It is transmitted to the power transaction management server 15 together with the amount of power that can be sold or purchased.

The solar power generation device 30 installed in the office 3 includes a power generation unit 31 including one or a plurality of solar panels including a plurality of cells, and a power storage device ( (not shown), and a control device 35 that controls the power generation unit 31 . The control device 35 of the photovoltaic power generation device 30 includes a microcomputer (not shown) having a CPU, ROM, RAM, etc., and a storage device 37 that stores various data. The control device 35 adjusts (controls) the power output from the power generation unit 31 to the power system 1 based on signals from various sensors provided in the power generation unit 31 . In addition, the control device 35 is connected to the power transaction management server 15 via the communication network NW, and sends a sale request for the power generated by the power generation unit 31 or the power of the power system 1 according to the power generation state of the power generation unit 31 or the like. A purchase request for (surplus power) is transmitted to the power transaction management server 15 together with the amount of power that can be sold or purchased.

In addition, in the power adjustment system 10 of the present embodiment, even a consumer who does not have a power generation device such as the residence 4 can access the power transaction management server 15 from a terminal 40 such as a personal computer via the communication network NW. can be done. Therefore, even a consumer who does not have a power generation device can transmit a purchase request for power of the power system 1 from the terminal 40 to the power transaction management server 15 and conduct a power transaction.

Next, with reference to FIGS. 2 and 3, operations of the power transaction management server 15, the cogeneration system 20, and the like related to power trading will be described in detail.

FIG. 2 is a flow chart showing an example of a routine repeatedly executed by the power trading management server 15 at predetermined time intervals. At the start of the routine of FIG. 2, the arithmetic processing unit of the power transaction management server 15 searches for a consumer (seller) requesting the sale of power and a consumer (buyer) requesting the purchase of power. , whether there are both sellers and buyers of electricity (step S110). If it is determined in step S110 that there are both a seller and a buyer of electricity (step S110: YES), the arithmetic processing unit of the electricity transaction management server 15 stores the minimum The selling price and the highest purchase price of the consumer requesting purchase of power are acquired (step S120). Furthermore, the arithmetic processing unit of the power transaction management server 15 determines whether or not there is a consumer (power buyer) who has set the highest purchase price that matches the lowest sale price acquired in step S100, that is, whether or not the sale request is present. Alternatively, it is determined whether or not the power transaction corresponding to the purchase request is established (step S130).

If it is determined in step S130 that there is an electric power buyer or seller corresponding to the electric power sale request or electric power purchase request from the consumer side and the electric power transaction is concluded (step S130: YES), the electric power transaction management server The arithmetic processing unit 15 generates a sale request based on the amount of power that can be sold transmitted from the consumer who is the seller of power and the amount of power that can be purchased from the consumer who is the buyer of power. Alternatively, the transaction amount (electric power amount) corresponding to the purchase request is determined (step S140). Next, the arithmetic processing unit of the power transaction management server 15 blocks the transaction details including the consumer (ID) involved in the current transaction, the contracted date and time of the transaction, the transaction price, the power transaction amount determined in step S130, and the like. Store (step S150). In step S150, a hash value (block information) is calculated based on the contents of the block storing the previous transaction details, and the hash value is stored in the current block together with the current transaction details.

Then, the power transaction management server 15 stores the block generated in step S150, that is, the contents of the current transaction, in all consumers (control devices 25, 35, The data is transmitted to the terminal 40 and the smart meter 50), stored (held) in its own storage device 17 (step S160), and the routine of FIG. 2 is once terminated. That is, in the power adjustment system 10, each transaction content is stored in a corresponding block together with the information of the previous block, and the transaction content (transaction history) of all transactions is stored by the power transaction management server 15 and a plurality of consumers. shared.

On the other hand, if it is determined in step S110 that there is no other consumer requesting purchase or sale of power (step S110: NO), the arithmetic processing unit of the power transaction management server 15 determines that the transaction has not been completed. The content of the transaction indicating that the transaction has been completed is transmitted to the corresponding consumer side (step S170), and the routine of FIG. 2 is once terminated. Further, when it is determined in step S130 that there is no power buyer or seller corresponding to the power sale request or power purchase request from the consumer side and the power transaction is not established (step S130: NO), The arithmetic processing unit of the power transaction management server 15 transmits transaction details indicating that the transaction was unsuccessful to the corresponding consumer side (step S170), and once terminates the routine of FIG. Note that when the routine of FIG. 2 is executed, a plurality of consumers may be selected as power buyers or sellers for one sale request or purchase request. In addition, by transmitting the transaction details to the smart meter 50, the income/expenditure associated with the electricity transaction is subtracted or added from the electricity bill. However, the settlement of electricity transactions may be made separately from the normal electricity bill.

FIG. 3 is executed at predetermined time intervals by the control device 25 of the cogeneration system 20 or the control device 35 of the solar power generation device 30 connected to the power system 1 in order to trade power through the power trading management server 15. 4 is a flow chart showing an example of a routine; Here, the routine of FIG. 3 will be described by taking as an example a case of requesting power trading from the cogeneration system 20 .

At the start of the routine of FIG. 3, the control device 25 (CPU) of the cogeneration system 20 acquires the voltage of the power system 1 via the system power sensor and adjusts the frequency of the power system 1 based on the voltage waveform and the like. Acquire (step S200). Further, the control device 25 determines whether power fluctuation has occurred in the power system 1 based on the acquired voltage and frequency of the power system 1 (step S210). In step S210, if the voltage of the power system 1 is lower than the lower limit value of the predetermined allowable range and the frequency of the power system 1 is less than the predetermined value, and if the voltage of the power system 1 is within the predetermined allowable range and the frequency of the power system 1 is higher than the predetermined value, it is determined that power fluctuation has occurred in the power system 1 . When it is determined in step S210 that power fluctuation has occurred in power system 1 (step S210: YES), control device 25 determines whether the voltage of power system 1 is lower or higher than the allowable range. Determine (step S220).

When it is determined in step S220 that the voltage of the power system 1 is lower than the allowable range (step S220: YES), the control device 25 calculates the generated power of the power generation unit 21 and The surplus power generation capacity of the power generation unit 21 (cogeneration system 20) is calculated by subtracting it from the rated power generation of the power generation unit 21 (step S230). Furthermore, the control device 25 determines whether or not the remaining power generation capacity is equal to or greater than a predetermined threshold (step S240). When it is determined in step S240 that the surplus power generation capacity is equal to or greater than the predetermined threshold (step S240: NO), the control device 25 controls the power sale time (for example, one frame of the smart meter 50) according to a predetermined constraint. (30 minutes) or more and less than 2 frames, and the time up to the next 0 minutes or 30) is set, and the sale time is multiplied by the surplus power generation capacity to set the sellable power amount, and the sellable amount is set. and a sale request to the power transaction management server 15 (step S250). In addition, when the time for one frame of the smart meter 50 becomes shorter than 30 minutes, the purchase time can be set accordingly.

After the process of step S250, the control device 25 receives transaction details (blocks) from the power transaction management server 15 (step S260), and based on the received transaction details, determines the amount of power corresponding to the sale request transmitted in step S250. It is determined whether or not the transaction has been concluded (step S270). If it is determined in step S270 that the power transaction has been completed (step S270: YES), the control device 25 stores (holds) the received transaction details (block) in the storage device 27 (step S280). Then, the control device 25 instructs an increase in the power generated by the power generation unit 21 (the cogeneration system 20) (step S290), and once terminates the routine of FIG. After executing the process of step S290, the control device 25 controls (rated operation) the power generation unit 21 so as to increase the generated power in accordance with the details of the transaction until the above-mentioned selling time elapses, thereby reducing the surplus generated power. It is supplied to the power system 1 . If negative determinations are made in steps S210, S240 and S270, the subsequent processing is skipped, and the routine of FIG. 3 ends at that point.

On the other hand, when it is determined in step S220 that the voltage of the power system 1 is higher than the allowable range (step S220: NO), the control device 25 calculates the power generated by the power generation unit 21 (step S235), It is determined whether or not the generated power is zero (step S245). If it is determined in step S245 that the generated power is not zero (step S245: YES), the control device 25 sets the power purchase time (for example, one frame (30 minutes) or more of the smart meter 50) according to a predetermined constraint. and set the amount of power that can be purchased by multiplying the power generation that can be reduced at that time by the power purchase time, The amount of power that can be purchased and the purchase request are transmitted to the power transaction management server 15 (step S255). In addition, when the time for one frame of the smart meter 50 becomes shorter than 30 minutes, the purchase time can be set accordingly.

After the process of step S255, the control device 25 receives transaction details (blocks) from the power transaction management server 15 (step S265), and based on the received transaction details, determines the amount of power corresponding to the purchase request transmitted in step S255. It is determined whether or not the transaction has been concluded (step S275). If it is determined in step S275 that the power transaction has been completed (step S275: YES), the control device 25 stores (holds) the received transaction details (block) in the storage device 27 (step S285). Then, the control device 25 instructs the power generation unit 21 (cogeneration system 20) to decrease the power generated (step S295), and once terminates the routine of FIG. After executing the process of step S295, the control device 25 controls the power generation unit 21 (partial load operation or shutdown) so as to reduce the generated power according to the content of the transaction until the above-mentioned purchase time elapses, thereby purchasing A portion of the electric power is supplied from the electric power system 1 to the consumer having the cogeneration system 20 , that is, the residence 2 . If negative determinations are made in steps S245 and S275, the subsequent processing is skipped, and the routine of FIG. 3 ends at that point.

As described above, when the power transaction management server 15 determines that the power transaction corresponding to the sale request is established (step S130 in FIG. 2: YES, step S270 in FIG. 3), the control device 25 of the cogeneration system 20 : YES), the power generated by the power generation unit 21 (cogeneration system 20) is increased (S290). That is, according to the power adjustment system 10, when power fluctuations occur in the power system 1 due to a decrease in the power generated by the renewable energy power generation device such as the solar power generation device 30, the cogeneration system 20 as shown in FIG. is established to sell electric power to other consumers, the electric power generated by the cogeneration system 20 can be supplied to the electric power system 1 and the electric power system 1 can be stabilized.

Further, when the power transaction management server 15 determines that the power transaction corresponding to the purchase request is established, the control device 25 of the cogeneration system 20 (step S130 in FIG. 2: YES, step S275 in FIG. 3: YES). , the power generated by the power generation unit 21 (cogeneration system 20) is reduced (step S295). As a result, when power fluctuations occur in the power system 1 due to an increase in the power generated by the photovoltaic power generation device 30 or the like, as shown in FIG. By establishing the purchase of electric power from consumers having the photovoltaic power generation device 30, etc., the amount of power generated by the cogeneration system 20 is reduced, and the power generated by the photovoltaic power generation device 30, etc. (surplus power) is absorbed. , thereby making it possible to stabilize the power system 1 .

Furthermore, in the power adjustment system 10, all power transaction details are stored in the storage device 17 of the power transaction management server 15 and all consumers in the power system 1, that is, the storage device 27 of the cogeneration system 20 and the storage device of the solar power generation device 30. 37, stored in the storage device 47 of the terminal 40 or the like. That is, in the power adjustment system 10, the power transaction management server 15, the control device 25 of the cogeneration system 20, the control device 35 of the solar power generation device 30, the terminal 40, etc. constitute a distributed database using blockchain technology, The power transaction management server 15 functions as a miner in the blockchain. In this way, by using blockchain technology (distributed ledger technology), it is possible to ensure that transaction details (transaction history) are highly resistant to tampering, thereby further improving the safety of electricity transactions between multiple consumers. It is possible to

As a result, according to the power adjustment system 10, it is possible to trade power between a plurality of consumers while ensuring the safety of the transaction, can stabilize the power system 1 interconnected. In addition, the cogeneration system 20 side instantaneously determines whether or not there is a power fluctuation in the power system 1, and transmits a power sale request or power purchase request to the power trading management server 15 according to the determination result. It is possible to cope with fine fluctuations in the generated power of the renewable energy power generation device such as the device 30 with good responsiveness.

Furthermore, in the power adjustment system 10, the control device 25 of the cogeneration system 20 calculates the surplus power generation capacity of the cogeneration system 20 when the voltage of the power system 1 falls below the allowable range, and if there is surplus power generation capacity to the power transaction management server 15 (step S220 in FIG. 3: YES, steps S230-250). On the other hand, the control device 25 calculates the power generated by the cogeneration system 20 when the voltage of the power system 1 exceeds the allowable range, and sends a purchase request to the power transaction management server 15 when the generated power is not zero. (step S220: NO, steps S235-S255). As a result, power fluctuations in the power system 1 can be detected quickly and appropriately using the functions provided in the cogeneration system 20, so that an increase in cost when constructing the power adjustment system 10 can be suppressed.

In addition, the storage device 17 of the power transaction management server 15 stores the minimum sale price and the maximum purchase price of power for each of a plurality of consumers. It is determined whether or not the power transaction will be concluded based on the highest purchase price of the power buyer (steps S120 and S130 in FIG. 2). As a result, when power fluctuations occur in the power system 1, it is possible to easily and quickly establish power transactions among a plurality of consumers. In the present embodiment, the minimum selling price when the power fluctuation of the power system 1 occurs due to the decrease in the power generated by the renewable energy power generation device such as the solar power generation device 30 is the renewable energy power generation device such as the solar power generation device 30 is set higher than the minimum sale price during normal times when the decrease in generated power has little impact on the power system 1 . As a result, a consumer having the cogeneration system 20 that contributes to resolving power fluctuations when there is a risk that the power system 1 will become unstable due to a decrease in the power generated by the renewable energy power generation device such as the solar power generation device 30. Since it is possible to give a consideration to the customer, it is possible to increase the merit of the customer.

Furthermore, according to the power adjustment system 10 of the present disclosure, it is possible to increase or decrease the output of the power generation unit 21 of the cogeneration system 20, that is, the fuel cell FC, while taking cost into consideration. Therefore, it is possible to increase the merits of the consumer having the cogeneration system 20 . However, the cogeneration system 20 is not limited to including the fuel cell FC, and may include, for example, a gas engine.

Note that in the power adjustment system 10 of the above embodiment, only the power transaction management server 15 functions as a miner in the blockchain. Or all may act as minors. Further, instead of generating a block for each power transaction as described above, the transaction details of power transactions within a certain period of time may be treated as one block. Furthermore, in each consumer of the electric power system 1, the routine of FIG. (Building Energy Management System) controller. Further, when the routine of FIG. 3 is executed by a controller of a power generator other than the controller 25 of the cogeneration system 20, such as the controller 35 of the solar power generator 30, in steps S230, S235, S290, and S295, It suffices if the processing that matches the corresponding power generation device is executed.

It goes without saying that the invention of the present disclosure is not limited to the above-described embodiments, and various modifications can be made within the scope of the present disclosure. Furthermore, the above-described embodiment is merely one specific form of the invention described in the Summary of the Invention column, and does not limit the elements of the invention described in the Summary of the Invention column.

INDUSTRIAL APPLICABILITY The invention of the present disclosure can be used in the manufacturing industry of power generators such as cogeneration systems.

Reference Signs List 1 power system 2, 4 residence 3 office 10 power adjustment system 15 power transaction management server 17 storage device 20 cogeneration system 21 power generation unit 22 hot water supply facility 25 control device 27 storage device 30 Photovoltaic power generation device 31 power generation unit 35 control device 37 storage device 40 terminal 50 smart meter FC fuel cell NW communication network.

Claims (7)

A power regulation system that adjusts power fluctuations in a power system in which a renewable energy power generation device that generates power using renewable energy and a cogeneration system are interconnected and in which reverse power flow from the cogeneration system is allowed,
A management device for managing power transactions among a plurality of consumers of the electric power system, including consumers having the cogeneration system,
The cogeneration system determines whether or not the power fluctuation has occurred in the power system, and when it is determined that the power fluctuation has occurred, a sale request for the power generated by the cogeneration system or the power of the power system including a control device that transmits a purchase request of to the management device,
The management device determines whether or not the power transaction is established in response to the sale request or the purchase request from the control device, and if it is determined that the power transaction is established, at least the power transaction amount is determined. to the control device and hold the transaction content,
A power adjustment system in which the control device adjusts the power generated by the cogeneration system in accordance with the content of the transaction from the management device and holds the content of the transaction. The power regulation system of claim 1, wherein
The control device increases the generated power of the cogeneration system when the management device determines that the transaction of the power corresponding to the sale request is established, and the management device responds to the purchase request. A power adjustment system that reduces the generated power of the cogeneration system when it is determined that a power transaction will be established. In the power regulation system according to claim 1 or 2,
When the voltage of the electric power system falls below an allowable range, the control device calculates the surplus power generation capacity of the cogeneration system, and if there is the surplus power generation capacity, transmits the sale request to the management device, A power adjustment system that calculates the generated power of the cogeneration system when the voltage of the power system exceeds an allowable range, and transmits the purchase request to the management device when the generated power is not zero. In the power regulation system according to any one of claims 1 to 3,
The transaction details are stored in a block, and the transaction details and the information of the previous block are stored in the block, and the transaction details of all transactions are shared by the management device and the plurality of consumers. power regulation system. In the power regulation system according to any one of claims 1 to 4,
The management device stores a minimum sale price and a maximum purchase price of power for each of the plurality of consumers, and trades the power based on the minimum sale price of the power seller and the maximum purchase price of the power buyer. A power adjustment system that determines whether or not is established. In the power regulation system of claim 5,
The minimum selling price when the power fluctuation of the power system occurs due to a decrease in the power generated by the renewable energy power generation device has little impact on the power system due to the decrease in the power generated by the renewable energy power generation device. A power regulation system that is set higher than the minimum sale price at the time. In the power regulation system according to any one of claims 1 to 6,
The cogeneration system is a power regulation system including a fuel cell that generates power through an electrochemical reaction between an anode gas and a cathode gas.

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