JP7343241B1 - Electricity trading method - Google Patents

Abstract

An object of the present invention is to provide a power trading method that enables stable supply of power. [Solution] The power trading method of the present invention provides power trading in a power trading market where renewable energy identification information identifying whether the power to be traded is generated by renewable energy is given as information on the power to be traded. This is a power trading method that determines the power trading market for power trading based on the power price, capacity, and renewable energy identification information in the power trading market, and trades power based on the storage status of the power storage system. I do. [Selection diagram] Figure 6

Description

The present invention relates to a power storage management system that manages power that is supplied from a plurality of power storage systems to a power grid and that is stored in a plurality of power storage systems from the power grid.

In recent years, the use of renewable energy such as solar power generation and wind power generation has been promoted with the aim of achieving carbon neutrality in the future. Renewable energy such as solar power generation and wind power generation fluctuates in the amount of power generated depending on factors such as weather and time of day, so if their introduction progresses, it may affect the stability of the power system. When connecting renewable energy to a commercial power system, it is necessary to deal with fluctuations in the amount of power generated by the renewable energy (for example, see Patent Document 1).

In the power supply system of Patent Document 1, commands regarding power generation and power supply are given to each auxiliary power source of a power source group consisting of a plurality of auxiliary power sources connected to the power transmission and distribution grid and power consumers so as to be able to selectively supply power. A control unit is provided, and the control unit causes the auxiliary power source to supply power to the power transmission and distribution grid based on a power request by an electric utility.

JP2020-043735A

In this type of power supply system, if there is a shortage of power at a power generation company or electric utility, power can be supplied from an auxiliary power source connected to the power grid, so it is possible to avoid fluctuations in renewable energy, etc. It is possible to cope with short-term power supply fluctuations. On the other hand, with the aim of ensuring a stable supply of electricity into the future, the introduction of the electricity trading market is progressing, and there is a need for technology that can adjust the supply and demand of electricity in response to electricity trading in the electricity trading market. There is.

The present invention has been made to solve these problems, and provides a system that enables power supply and demand adjustment through power trading in the power trading market and enables stable power supply into the future. The purpose is to

In order to achieve such an objective, the power trading method of the present invention includes a wholesale power market, a capacity market, and a supply and demand adjustment market, and uses information on whether the power is generated by renewable energy as information on the power to be traded. A power trading method in a power trading system that trades power in a power trading market in which renewable energy identification information that identifies renewable energy is provided, the power trading method comprising: A first step of determining the power trading market for power trading among the wholesale power market, capacity market, and supply and demand adjustment market based on the identification information, and managing the power storage status of multiple power storage systems connected to the power grid. a second step of determining the charging or discharging time and power capacity based on the discharging power or charging power capacity of the power storage system received from the power management system; and the power determined in the first step. In the trading market, a third step of trading power based on the charging or discharging time and power capacity determined in the second step, and a power trading result in the third step, the power management system and a fourth step of notifying.

Moreover, in the third step, based on the renewable energy identification information, only the power generated by the renewable energy may be specified and the power transaction may be performed.

According to the present invention, it is possible to provide a system that enables power supply and demand adjustment through power trading in a power trading market, and that enables stable power supply into the future.

FIG. 1 is a system configuration diagram of a power supply system using a power storage management system according to an embodiment of the present invention. FIG. 2 is a diagram showing an example of a power storage management table in the power storage management system according to the embodiment of the present invention. FIG. 3 is a diagram showing an example of the operation sequence of the power storage management system according to the embodiment of the present invention. FIG. 4 is a diagram showing another example of the operation sequence of the power storage management system according to the embodiment of the present invention. FIG. 5 is an example of the configuration of the power storage system in the power storage management system according to the embodiment of the present invention. FIG. 6 is a diagram showing an example of the operation sequence of the power trading method in the power trading system according to the embodiment of the present invention.

Next, embodiments of the present invention will be described with reference to the drawings. Note that the embodiments of the present invention described below are examples for implementing the present invention, and the present invention is not intended to be limited to the embodiments described below.

<System configuration of power supply system>
Referring to FIG. 1, a power supply system 1 using a power storage management system 10 according to an embodiment of the present invention will be described. FIG. 1 is a system configuration diagram of a power supply system 1 using a power storage management system according to an embodiment of the present invention.

A power supply system 1 using a power storage management system 10 according to an embodiment of the present invention includes a power trading system 40 that trades power in a power trading market 70, and a plurality of power storage systems 30 connected to a commercial power system 60. , a power management system 20 that manages the power storage status of the plurality of power storage systems 30 and instructs each power storage system 30 to discharge or charge power.

The plurality of power storage systems 30 are directly connected to the commercial power system 60, and contribute to the adjustment of power supply and demand in the commercial power system 60 by discharging to the commercial power system 60 or charging from the commercial power system 60. Can be done.

A business 80 such as a power generation business or an electricity business and a power consumer 90 are connected to the commercial power system 60 , and power supplied from the business 80 is supplied to the power consumer 90 . The businesses 80 also include power generation businesses that supply renewable energy to the commercial power system 60.

The power trading market 70 includes, for example, a wholesale power market, a capacity market, and a supply and demand adjustment market. In the power trading market 70, the amount of power traded in the wholesale power market, the power supply capacity traded in the capacity market, and the power adjustment capacity traded in the supply and demand adjustment market are traded.

The power trading system 40 exchanges electricity amounts traded in the wholesale power market and power supply capacity traded in the capacity market between power generation companies and businesses 80 including electric power companies through the power trading market 70. , and trading power adjustment power traded in the supply and demand adjustment market. The power trading system 40 requests the power storage management system 10 to discharge or charge power based on the result of power trading in the power trading market 70 .

The power management system 20 manages the power storage status of the plurality of power storage systems 30 via the cloud 50, and notifies the power trading system 40 of the ability to handle power trading based on the power storage status. For example, the values of discharge power and charging power that can be handled by the plurality of power storage systems 30 as a whole are notified as the ability to handle power trading.

The power trading system 40 trades power in the power trading market 70, and transmits a request for discharging or charging power to the power management system 20 based on the power trading results and the response capability from the power management system 20. .

The power management system 20 receives a request for discharging or charging power from the power trading system 40 and determines the allocation of power to each of the plurality of power storage systems 30 based on the power storage status of the plurality of power storage systems 30. Then, each power storage system 30 is instructed to discharge power to the commercial power grid 60 or charge power from the commercial power grid 60 via the cloud 50.

Each power storage system 30 discharges power to or charges power from the commercial power grid 60 based on instructions from the power management system 20 received via the cloud 50. Each power storage system 30 can contribute to adjusting the power supply and demand balance in the commercial power system 60 by discharging power to the commercial power system 60 or charging power from the commercial power system 60 .

Each power storage system 30 includes a storage battery of a predetermined capacity and a power control device. The power control device controls discharging and charging of power in the storage battery and discharging and charging of power with the commercial power system 60. The power control device controls the discharging and charging of power in the storage battery and the discharging and charging of power between the commercial power grid 60 based on instructions from the power management system 20, and controls the charging capacity, free capacity, etc. of the storage battery. The power storage status including the information is transmitted to the power management system 20.

The power storage system 30 has a basic configuration of a storage battery, a bidirectional inverter, and a cubicle. A bidirectional inverter is a device that is installed in a power control device and converts power between direct current power and alternating current power in both directions. A cubicle is a device that converts power between a power control device and a commercial power system or a load system.

Here, it is desirable that the input/output (charging/discharging) speed of the storage battery is the same as the inverter capacity (input/output capacity of the inverter). For example, if the storage battery capacity is 2000 kWh (2 MWh) and the inverter capacity is 2000 kW, it is optimal that the input/output speed of the storage battery is 2000 kW (C-Rate) in accordance with the inverter capacity. Note that, after making the input/output speed of the storage battery correspond to the inverter capacity, it is possible to increase the capacity of the storage battery in the above-mentioned units. If the storage battery input/output speed is less than the inverter capacity, connect the storage batteries in parallel. C-Rate has no meaning even if it exceeds the inverter's capacity. In order to make a high voltage connection (200kW or less), it is also possible to increase the storage battery capacity by connecting multiple storage batteries to one inverter under the storage battery of one storage battery (master). Alternatively, one or more storage batteries can be connected to one inverter in a distributed manner.

As for the configuration of the storage battery, it is desirable to use a 20-foot container and mount a 2MWh storage battery. When a 4MWh storage battery is installed in a 40-foot container, current lithium-ion storage batteries are too heavy and long, which may cause problems during transportation. Furthermore, considering the road conditions in Japan, there is a problem that a 40-foot container is too long, so it is recommended to use a 20-foot container.

The power storage management system 10 according to the embodiment of the present invention manages the power storage status of a plurality of power storage systems directly connected to the commercial power grid 60, and based on the power traded in the power trading market 70 and the power storage status, Each power storage system is configured to discharge power to the commercial power grid 60 or charge power from the commercial power grid 60.

This configuration not only responds to short-term power supply fluctuations such as fluctuations in renewable energy, but also enables long-term power supply and demand adjustment based on the transaction results in the power trading market 70, thereby ensuring future stability. It becomes possible to provide a system that provides a stable supply of electricity.

<Electricity storage management table>
FIG. 2 is a diagram showing an example of a power storage management table in the power storage management system according to the embodiment of the present invention. The power storage management table is a management table for managing the power storage status of each power storage system of the plurality of power storage systems 30. The power storage management table is managed in the power management system 20.

In the example of FIG. 2, the total storage battery capacity, the charging capacity of the storage battery, and the free capacity are stored in the power storage management table as information indicating the power storage status of each power storage system 30. In the power management system 20, upon receiving a request to charge or discharge power from the power trading system 40, each power storage system 30 discharges to the commercial power grid 60 based on the power storage status of each power storage system 30 in the power storage management table. Alternatively, the power to be charged to the commercial power grid 60 is determined.

Since the power management system 20 collectively manages the power storage status of each power storage system of the plurality of power storage systems 30, the ability to handle the power traded in the power trading market 70 is determined based on the power storage status of the plurality of power storage systems 30. The discharging power and charging power in each power storage system 30 can be determined according to the power status of each power storage system 30, and each power storage system 30 can be instructed to discharge or charge.

Further, the power storage management system 10 of the present embodiment is capable of dealing with power transactions in various power trading markets 70, for example, the wholesale power market, the capacity market, and the supply and demand adjustment market. The power storage management table is also configured to be compatible with power trading in the wholesale power market, capacity market, and supply and demand adjustment market.

For example, as shown in FIG. 2, a predetermined power capacity can be secured as a matched capacity in accordance with the power supply capacity in the capacity market and the power adjustment capacity traded in the supply and demand adjustment market. In the configuration example of FIG. 2, in each power storage system 30, the capacity excluding the supported capacity out of the charging capacity becomes the dischargeable capacity. Further, when electricity generated by renewable energy is specified and traded in the power trading market 70, the capacity can be stored as the renewable energy power capacity.

<Power supply operation of power storage management system>
The power supply operation of the power storage management system 10 according to the present embodiment will be explained using FIG. 3. FIG. 3 is a diagram showing an example of the operation sequence of the power storage management system according to the embodiment of the present invention.

Each power storage system 30 provides the power storage status of the storage battery to the power management system 20 via the cloud 50 (100), and the power management system 20 registers the power storage status of each power storage system 30 in the power storage management table (101). .

Each power storage system 30 provides the power management system 20 with the power storage status of the storage battery when there is a change in the power storage status of the storage battery. Information such as failure of the storage battery can also be provided as the power storage status.

The power management system 20 notifies the power trading system 40 of the response capability regarding discharge power or charging power corresponding to power trading based on the power storage status in the power storage management table (102). For example, the discharge power and charging power that can be handled by the plurality of power storage systems 30 as a whole are notified as the ability to handle power trading.

In the power trading system 40, the power amount traded in the wholesale power market, the power supply capacity traded in the capacity market, and the power adjustment power traded in the supply and demand adjustment market are traded in the power trading market 70, and the traded power is traded in the power trading market 70. is determined (110, 111).

Power trading in the power trading market 70 includes buying and selling power. When purchasing power, the power storage system 30 is charged from the commercial power system 60, and when selling power, the power storage system 30 is discharged to the commercial power system 60.

The power trading system 40 requests the power management system 20 to charge or discharge power corresponding to the power trading in the power trading market 70 based on the information on the power trading capability (120). The charging power or discharging power requested to the power management system 20 is determined within the capability of the power management system 20. The power trading system 40 may distribute handling of traded power to the plurality of power management systems 20 based on information on the handling capabilities of the plurality of power management systems 20.

In response to the request from the power trading system 40, the power management system 20 refers to the power storage status in the power storage management table and determines the allocation of power in each of the power storage systems 30 (121). The power management system 20 instructs each power storage system 30 to discharge to or charge from the commercial power grid 60 via the cloud 50 (122).

Each power storage system of the plurality of power storage systems 30 discharges power to the commercial power grid 60 or charges power from the commercial power grid 60 (130) based on instructions from the power management system 20, and charges the power from the commercial power grid 60 via the cloud 50. and transmits the latest power storage status to the power management system 20 (131).

<Effects of the embodiments of the present invention>
In this way, the power storage management system 10 according to the embodiment of the present invention manages the power storage status of a plurality of power storage systems directly connected to the commercial power grid 60, and manages the power storage status and the power traded in the power trading market 70. Based on the above, each power storage system is configured to discharge power to or charge power from the commercial power grid. This configuration not only responds to short-term power supply fluctuations such as fluctuations in renewable energy, but also enables long-term power supply and demand adjustment based on the transaction results in the power trading market 70, thereby ensuring future stability. It becomes possible to provide a system that provides a stable supply of electricity.

Furthermore, the power storage management system 10 according to the embodiment of the present invention can handle power trading in various power trading markets 70 such as the wholesale power market, the capacity market, and the supply and demand adjustment market. In response to the amount of electricity traded in the wholesale power market, the power supply capacity traded in the capacity market, and the power adjustment capacity traded in the supply and demand adjustment market, we contribute to long-term power supply and demand adjustment and stabilize power. can contribute to supply.

<Expansion of embodiment>
Although the present invention has been described above with reference to the embodiments, the present invention is not limited to the above embodiments. The configuration and details of the present invention may be modified in various ways within the scope of the present invention by those skilled in the art.

In the sequence shown in FIG. 3, after the power trading system 40 conducts a transaction in the power trading market 70, the power trading system 40 sends a message to the power management system 20 in accordance with the discharging or charging power capacity notified from the power management system 20. The device is configured to request charging or discharging of power.

FIG. 4 is a diagram showing another example of the operation sequence of the power storage management system according to the embodiment of the present invention. In the sequence of FIG. 4, the power trading system 40 operates in the power trading market based on the power storage status notified from the power management system 20 that manages the power storage status of the power storage system 30, and the price and capacity of power in the power trading market. It is configured to trade electricity (202, 210, 211, 212).

According to the sequence of FIG. 4, the power trading system 40 can trade power based on the power storage status of the power storage system 30, so power trading according to the price of power in the power trading market 70, that is, It is possible to conduct a power transaction in which power is purchased during a time period when the price is relatively low and the power is sold when a price higher than the price at the time of power purchase is presented.

In this case, the power trading system 40 provides the power management system 20 with information on the time for charging or discharging power and information on the amount of power to be charged or discharged, according to the result of power trading in the power trading market. (220). Such processing enables the power trading system 40 to perform reliable power trading based on the power storage status of the power storage system 30.

Further, the power trading system 40 may be configured so that only power generated by renewable energy can be specified and purchased in the power trading market 70. For example, it is possible to conduct electricity trading by purchasing electricity generated from renewable energy during times when the price is relatively low, and selling it during times when the price of electricity is relatively high. It becomes possible. When power generated by renewable energy is specified and purchased and the purchased power is charged in the power storage system 30, the capacity of that power is stored as the renewable energy power capacity in the power storage management table of FIG. Just leave it there. If renewable energy alone does not meet the capacity, it is sufficient to buy and sell energy from fossil fuels, etc., instead of renewable energy alone.

FIG. 5 is an example of the configuration of the power storage system in the power storage management system according to the embodiment of the present invention. Compared to the power storage system 30 of FIG. 1, the power storage system 30 in FIG. 5 is connected to a load such as a factory or a plant, and has a function of self-consuming power charged in a storage battery.

The power storage system 30 in FIG. 5 purchases only power purchased at a relatively low price in the power trading market 70 or power generated from renewable energy, and charges a storage battery with the purchased power. In addition to being discharged to the commercial power system 60, it can also be self-consumed by the load.

Note that, as shown in FIG. 5, the power storage system 30 is configured to include a UPS (Uninterruptible Power Supply) so that the self-sustaining function of the power control device does not operate in the event of a power outage in the commercial power system 60. Even in the event of a power outage, the electricity stored in the storage battery can be consumed internally.

FIG. 6 is a diagram showing an example of the operation sequence of the power trading method in the power trading system according to the embodiment of the present invention. In the sequence of FIG. 6, the power trading system 40 uses the wholesale power market, capacity market, capacity market, etc. The power trading market for power trading is determined from among the market and the supply and demand adjustment market (310, 311).

Electric power traded in the power trading market is given renewable energy identification information that identifies whether the electricity is generated by renewable energy as information on the traded electricity. By referring to the renewable energy identification information, the power trading system 40 can determine which market to conduct power trading among the wholesale power market, capacity market, and supply and demand adjustment market. Possible energy can be identified and electricity traded.

In the sequence of FIG. 6, the power trading system 40 requests the power management system 20 that manages the power storage status of the power storage system 30 for the ability to charge or discharge each power storage system, and is notified by the power management system 20. Power is traded in the power trading market based on the ability to charge or discharge, and the price and capacity of power in the power trading market determined above (312, 313, 314, 315).

The power trading system 40 can determine the power trading market and trade power based on the renewable energy identifier in the power trading market, so it facilitates power trading specifying power generated by renewable energy. can be done. The method of this embodiment is effective in showing the effect of using renewable energy, such as when it is mandatory to use electric power generated by renewable energy.

For example, it is possible to easily conduct power transactions such as purchasing power generated from renewable energy during times when the price is relatively low and selling power during times when the price of power is relatively high. It becomes possible to do so. This makes it clear how much power is being used generated by renewable energy, making it possible to objectively show the effects of using renewable energy.

When you specify and trade electricity generated by renewable energy, you can store the capacity of that electricity as the renewable energy capacity in the electricity storage management table in Figure 2, and use renewable energy to make transactions. It is possible to distinguish and manage generated power and other power.

1... Power supply system, 10... Energy storage management system, 20... Power management system, 30... Energy storage system, 40... Power trading system, 50... Cloud, 60... Commercial power system, 70... Power trading market, 80... Business operator, 90...Electricity consumer.

Claims (1)

In the power trading market, which includes the wholesale power market, capacity market, and supply and demand adjustment market, renewable energy identification information is attached to the traded power to identify whether the power is generated by renewable energy. A power trading method in a power trading system that trades power,
a first step of determining a power trading market for power trading among the wholesale power market, capacity market, and supply and demand adjustment market by referring to the renewable energy identification information of power in the power trading market;
Determining the charging or discharging time and power capacity based on the discharging power or charging power response capacity of the power storage system received from a power management system that manages the power storage status of multiple power storage systems connected to the power grid. The second step of
In the power trading market determined in the first step, only the power generated by the renewable energy is designated based on the charging or discharging time and power capacity determined in the second step. The third step of conducting the transaction,
A fourth step of notifying the power management system of the power trading result in the third step.

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