Power transaction device, power transaction method and program

Abstract

To more effectively use surplus power on power contracted at a power demand-supply adjusting market and a capacity market.SOLUTION: A power transaction device includes: a detection part for detecting that generation of surplus power has been confirmed when power supply is contracted in a prescribed contract time zone at a demand-supply adjusting market or a capacity market; and a market transaction part for performing a sales transaction for the surplus power in a pre-hour market before final time of the contract time zone when the detection part detects that generation of surplus power has been confirmed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to an energy trading device, an energy trading method, and a program. [Background technology]

[0002] In recent years, with the increasing introduction of renewable energy generators (such as solar power generators), supply and demand adjustment markets have been established with the aim of securing the adjustment capacity to maintain the balance between electricity supply and demand, as well as capacity markets with the aim of securing the necessary supply capacity in the medium to long term.

[0003] The supply and demand adjustment market trades the ability to adjust the supply and demand balance. The capacity market trades supply capacity when supply and demand are tight. The power sources that are covered by the capacity market include stable power sources (e.g., hydroelectric generators, thermal power generators, nuclear power generators, etc.), variable power sources (e.g., solar power generators, wind power generators, etc.), and activation command power sources (e.g., storage batteries, etc.). In the following, when referring to the capacity market, it is assumed that the target is activation command power sources. In addition, in the following, adjustment capacity and supply capacity are collectively referred to as "adjustment capacity, etc."

[0004] When it is necessary to respond to the actual supply and demand of electricity, general electricity transmission and distribution companies are required to issue instructions to provide adjustment capacity, etc.

[0005] When the supply and demand balance is relatively stable, there may be a command to activate the adjustment capacity below the contract amount, or there may be no command to activate the capacity. At this time, the adjustment capacity that was prepared in preparation for the command to activate the capacity will be left over, resulting in surplus electricity (hereinafter also referred to as "surplus capacity").

[0006] Related prior art includes, for example, creating a generator operation plan aimed at improving profits and a trading plan in the spot market and the supply-demand balancing market by solving an optimization problem that minimizes profits and losses based on spot prices, supply-demand balancing market prices, generator information, fuel price information, and the like.

[0007] Others create plans to allocate future electricity generated by renewable energy generators to balancing markets or wholesale electricity markets based on expected value calculations that maximize profits. [Prior art documents] [Patent documents]

[0008] [Patent Document 1] JP 2020-33530 A Summary of the Invention [Problem to be solved by the invention]

[0009] The above-mentioned conventional technology does not take into consideration the trading of surplus electricity that may occur. Currently, surplus electricity generated in relation to adjustment capacity agreed upon in the supply and demand adjustment market or capacity market is left as is during the agreement period, and is sold in the advance market after the agreement period. However, this method is not sufficient as a method for utilizing surplus electricity, and there is room for improvement.

[0010] Therefore, an object of the present embodiment is to provide an energy trading device, an energy trading method, and a program that are capable of more effectively utilizing surplus energy for energy agreed upon in the supply and demand adjustment market or the capacity market. [Means for solving the problem]

[0011] An energy trading device of an embodiment includes a detection unit that detects that a surplus of electricity has been generated for an electricity supply and demand adjustment market or a capacity market during a specified contract time period, and a market trading unit that performs a sales trading process for the surplus electricity in the pre-hour market before the end of the contract time period when the detection unit detects that the surplus electricity has been generated. [Brief description of the drawings]

[0012] [Figure 1]FIG. 1 is a block diagram showing a schematic overview of the entire power system according to the embodiment. [Diagram 2] Figure 2 is a time chart showing an example of a hypothetical supply and demand adjustment market (tertiary adjustment capacity "2"). [Diagram 3] FIG. 3 is a time chart illustrating the prior art approach with respect to FIG. [Figure 4] FIG. 4 is a time chart illustrating the method of the embodiment with respect to FIG. [Diagram 5] FIG. 5 is a time chart showing an assumed example regarding the capacity market (activation command power source). [Figure 6] FIG. 6 is a time chart illustrating the prior art approach with respect to FIG. [Figure 7] FIG. 7 is a time chart illustrating the method of the embodiment with respect to FIG. [Figure 8] FIG. 8 is a time chart showing an example of the most economical charging and discharging pattern for a storage battery in a supply and demand balancing market in accordance with the embodiment. [Figure 9] FIG. 9 is a flowchart illustrating a first process performed by the energy trading system according to the embodiment. [Figure 10] FIG. 10 is a flowchart illustrating a second process performed by the energy trading system according to the embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] Hereinafter, an embodiment of an energy trading device, an energy trading method, and a program according to the present invention will be described with reference to the drawings.

[0014] Fig. 1 is a block diagram showing a schematic overview of an entire power system S according to an embodiment. Note that in Fig. 1, arrows indicate main information flows, and information may flow through parts without arrows.

[0015] The power system S includes an electricity trading system 1 (electricity trading device), a general electricity transmission and distribution company 101, a Japan Electric Power Exchange 201, an Organization for Cross-regional Coordination of Transmission Operators 301 (prescribed organization), and resources 401.

[0016] The general electricity transmission and distribution company 101 is a company that delivers electricity to the point where electricity is used by consumers via transmission lines, distribution lines, and the like.

[0017] The Japan Electric Power Exchange (JEPX)201 is a venue for electricity trading.

[0018] The Organization for Cross-regional Coordination of Transmission Operators (OCCTO)301 is an organization that promotes cross-regional coordination of the electric power industry.

[0019] The resource 401 is a power source resource with a capacity constraint on the amount of power for power generation or DR (Demand Response) purposes, such as a storage battery (a secondary battery that can be repeatedly charged and discharged) or a hydroelectric power generation source.

[0020] The energy trading system 1 is a computer device, and includes a processing unit 91, a storage unit 92, an input unit 93, and an output unit 94. The energy trading system 1 also includes a communication unit (communication interface) for communicating with the outside, but for the sake of brevity, this is not shown and is not described here.

[0021] The storage unit 92 is configured with, for example, a random access memory (RAM), a read only memory (ROM), a solid state drive (SSD), a hard disk drive (HDD), etc., and stores various information. The storage unit 92 includes a database (DB) 921.

[0022] The input unit 93 is configured with, for example, a keyboard, a mouse, a touch panel, etc., and is used by the user to input information.

[0023] The output unit 94 is a means for outputting information, and is, for example, a display device such as an LCD (Liquid Crystal Display) or an audio output device such as a speaker.

[0024] The processing unit 91 is configured with, for example, a CPU (Central Processing Unit) and executes various information processes. Each functional unit in the processing unit 91 will be described below.

[0025] The reception unit 10 receives various information such as activation commands from a general electricity transmission and distribution company 101 .

[0026] When an agreement has been made to supply electricity during a specified contract time period in the supply and demand adjustment market or the capacity market, the detection unit 11 detects that the occurrence of surplus electricity has been confirmed based on the presence or absence of an activation command from the general electricity transmission and distribution company 101, and the content of the command if an activation command has been received.

[0027] The timing at which surplus capacity is confirmed varies from market to market.

[0028] (1) In the case of an adjustment market In a supply and demand adjustment market, when a supply of electricity by a resource 401 is agreed upon during a specified agreement time period, a detection unit 11 detects that the occurrence of surplus electricity has been confirmed when no activation command is received by the deadline for the activation command based on the response time of the resource 401, or when an activation command is received and the specified output power is smaller than expected.

[0029] For example, in the supply and demand adjustment market, the tertiary adjustment capacity of "2" ("2" indicates a number in circle; the same applies below) has a response time of within 45 minutes as of 2023. However, from fiscal 2025 onwards, this response time is scheduled to change to within 60 minutes.

[0030] (2) Capacity market (power source) In the capacity market (activation command power source), when a supply of electricity from resource 401 is agreed upon during a specified contract time period, the detection unit 11 detects that the occurrence of surplus electricity has been confirmed when no activation command is received by the deadline for the activation command.

[0031] Specifically, in the case of the capacity market (activation command power source), the supply of electricity is contracted for the time period from 9:00 to 20:00. If an activation occurs, the activation command is issued up to three hours before the activation frame (a frame in 30-minute increments), and once activated, the specified amount of electricity is supplied continuously for three hours. Therefore, for example, if there is no activation command between 9:00 and 14:00, this means that there will be no activation between 17:00 and 20:00, and the generation of three hours of surplus capacity is confirmed.

[0032] Furthermore, even when DR is invoked, the detection unit 11 detects that the occurrence of surplus power has been confirmed.

[0033] After it is determined that a surplus capacity has been generated, the detection unit 11 sends a detection signal to the resource surplus capacity calculation unit 12 and the market price prediction unit 22 .

[0034] The resource margin calculation unit 12 calculates the margin of the resource 401 based on information acquired from the resource 401 and the like, and registers the margin in the DB 921 of the storage unit 92 .

[0035] The market price information acquisition unit 21 constantly acquires market price information of the pre-hours market 202 from a specific site (such as a site on the Internet) of the Japan Electric Power Exchange 201 .

[0036] The market price prediction unit 22 predicts and calculates the time-ahead market price for the following time based on the market price information acquired by the market price information acquisition unit 21 , and registers it in the DB 921 .

[0037] The optimal operation pattern calculation unit 31 calculates an operation pattern (optimal operation pattern) that enables a bid to be made for the frame with the highest transaction price for future transactions of reserve capacity in the time-ahead market 202, based on each piece of information registered in DB921 by the resource reserve calculation unit 12 and the market price prediction unit 22.

[0038] The resource operation plan creation unit 41 creates an optimal operation plan (a charge / discharge plan in the case of a storage battery) for the resource 401 based on the calculation result (optimum operation pattern) of the optimal operation pattern calculation unit 31.

[0039] The power generation sales plan creation unit 42 modifies the power generation sales plan after the bid (trading volume) is agreed between the market trading unit 53 and the pre-hour market 202.

[0040] The bidding plan creation unit 43 creates a bidding plan based on the optimal driving pattern calculated by the optimal driving pattern calculation unit 31 , and submits a bid to the pre-hour market 202 via the market trading unit 53 .

[0041] When the contract time arrives, the output control unit 51 sends an output command to the resource 401 in accordance with the operation plan created by the resource operation plan creation unit 41 .

[0042] The power generation and sales plan output unit 52 submits the power generation and sales plan corrected by the power generation and sales plan creation unit 42 to the Agency for Cross-regional Coordination of Electric Power Generation 301 .

[0043] When the detection unit 11 detects that the occurrence of surplus electricity has been confirmed, the market trading unit 53 performs sales trading processing for the surplus electricity in the pre-hour market 202 before the final time of the contract time slot.

[0044] The market trading unit 53 submits bids for spare capacity in accordance with the bidding plan created by the bidding plan creation unit 43. More specifically, the process is as follows.

[0045] When carrying out sales transaction processing for surplus electricity in the pre-hour market 202, the market trading unit 53 places a bid for the most economical frame among the frames available for bidding, for example, based on a market price forecast for electricity.

[0046] In addition, when the resource 401 is a storage battery, the market trading unit 53, when performing sales trading processing for surplus electricity in the pre-hour market 202, places a bid for the most economical charging and discharging pattern for the storage battery based on, for example, a market price forecast for electricity.

[0047] In addition, the market trading unit 53 submits a bid to the hourly market 202 every time the generation of surplus power is confirmed. When the bid is concluded, the power generation sales plan creation unit 42 modifies the power generation sales plan. The power generation sales plan output unit 52 submits the modified power generation sales plan to the Agency for Cross-regional Coordination of Electric Power Generation 301.

[0048] Next, a specific example will be described with reference to Fig. 2 to Fig. 8. Fig. 2 is a time chart showing an assumed example regarding the supply and demand adjustment market. Here, it is assumed that the tertiary adjustment power "2" of the supply and demand adjustment market is activated in the block from 15:00 to 18:00. In addition, it is assumed that the resource 401 is a storage battery with a maximum output of 10,000 kW.

[0049] For the six time slots (K1-K6) from 15:00 to 18:00, if there is an activation, an activation command (target power: XXXX kW) will be issued. For example, for the time slot K1 from 15:00 to 15:30, if there is an activation, an activation command (e.g., target power: 10,000 kW) will be issued by 14:15 (code T1), 45 minutes before 15:00.

[0050] For K2, which runs from 15:30 to 16:00, if there is an activation, the activation command (for example, target power: 10,000 kW) will come by 14:45, 45 minutes before 15:30. Similarly, for K3 to K6, the activation command will come by 45 minutes before.

[0051] Fig. 3 is a time chart showing the conventional technique related to Fig. 2. In the conventional technique, bidding, contracting, and power generation sales plan revisions are made in the pre-hour market 202 outside of contract hours, that is, after 18:00 (symbol A1). Note that the pre-hour market 202 is an intraday market method, so contracts are made on a first-come, first-served basis in the order in which the selling and buying prices match. Specifically, for example, it is as follows.

[0052] For frame K1 from 15:00 to 15:30, it is assumed that the activation command (target power: 10,000 kW) was received by 14:15, 45 minutes before 15:00.

[0053] Next, for frame K2 from 15:30 to 16:00, it is assumed that an activation command (target power: 5,000 kW) is received by 14:45 (code T2), 45 minutes before 15:30. At that time, a reserve capacity of 5,000 kW is confirmed for frame K2 (it is unconfirmed for frames K3 to K6). After that, it is assumed that an activation command (target power: 5,000 kW) is received for frames K3 to K6 as well.

[0054] However, in the conventional technology, the bidding is conducted after the last frame of the block is activated (17:30-18:00), so the timing of the bidding is late. Also, the actual supply and demand section (symbol A2) starts at 21:00 at the earliest.

[0055] On the other hand, Fig. 4 is a time chart showing the method of the embodiment related to Fig. 2. In the method of the embodiment, bidding, contracting, and power generation sales plan correction are performed in the pre-hour market 202 within the contract time, that is, before 18:00 (symbol B1). Specifically, for example, it is as follows.

[0056] For frame K1 from 15:00 to 15:30, it is assumed that the activation command (target power: 10,000 kW) was received by 14:15, 45 minutes before 15:00.

[0057] Next, for frame K2 from 15:30 to 16:00, it is assumed that an activation command (target power: 5,000 kW) is received by 14:45 (code T2), 45 minutes before 15:30. At that time, a reserve capacity of 5,000 kW is confirmed for frame K2 (it is unconfirmed for frames K3 to K6). After that, it is assumed that an activation command (target power: 5,000 kW) is received for frames K3 to K6 as well.

[0058] In this case, bidding for the surplus capacity of frame K2 will be held in the afore-hours market 202 after 14:45 (symbol T2). However, it is not necessary to bid immediately; for example, it is sufficient to bid for the frame with the highest afore-hours market price. After the contract is concluded, the power generation sales plan is revised. Similarly, bidding for frames K3 to K6 will be possible as soon as the occurrence of surplus capacity is confirmed. The actual supply and demand section (symbol B2) will start from 18:00.

[0059] If such a method is adopted, there is no problem in terms of the assessment of the supply and demand adjustment market. First, regarding Assessment I, the requirement is to maintain generators etc. in a state where they can supply ΔkW. With the method of this embodiment, this requirement can be met because the supply capacity is secured at the time of gate closure (GC).

[0060] Regarding Assessment II, the requirement is to respond in a manner that satisfies the requirements of the product in accordance with the instructions of the general electricity transmission and distribution company 101. In this regard, in the method of the present embodiment, if an action is taken, adjustment power trading with other markets is not performed, and the response is made according to the prescribed requirements, so that compliance can be achieved.

[0061] Next, Fig. 5 is a time chart showing an assumed example regarding the capacity market (activation command power source). The contract time for the capacity market (activation command power source) is from 9:00 to 20:00, in 30-minute units. Activation is in three-hour units, and is basically activated once a day. Here, a storage battery is assumed as the resource 401, and activation is assumed to be in the time period from 17:00 to 20:00 (symbol C1).

[0062] If there is an activation, the activation command will come by 14:00 (code T3), three hours before 17:00. Note that this assumes that there will be no activation between 9:00 and 14:00 on the day. If there is no activation command by 14:00 (code T3), three hours' worth of spare capacity will be available for trading (code C2).

[0063] Fig. 6 is a time chart showing the conventional technique related to Fig. 5. In the conventional technique, if an activation command is not received by 14:00 within the contract time from 17:00 to 20:00 (symbols D1 and D2), bidding, contracting, and power generation sales plan revision are performed outside the contract time, that is, after 20:00 in the pre-hour market 202 (symbol D3). However, this is a late timing for bidding.

[0064] Fig. 7 is a time chart showing the method of the embodiment related to Fig. 5. In the method of the embodiment, bidding, contracting, and power generation sales plan correction are performed (E1) in the pre-hour market 202 within the contract time, that is, after 14:00 (T4) when the generation of surplus power is confirmed, which is significantly before 20:00.

[0065] However, it is not necessary to bid immediately. For example, it is sufficient to bid for the time slot with the highest market price in advance. After the contract is concluded, the power generation sales plan is revised. Symbol E3 indicates the time slot in which surplus capacity occurs. The actual supply and demand section (symbol E2) begins at 17:00.

[0066] There are also no problems with the assessment of the capacity market. For example, assessments of various requirements such as activation records can be performed on a frame-by-frame (30-minute interval) basis with favorable results.

[0067] Next, Fig. 8 is a time chart showing an example of the most economical charging and discharging pattern for a storage battery in the supply and demand adjustment market in the embodiment. Here, a storage battery directly connected to the grid is assumed as the resource 401. Also, it is assumed that the tertiary adjustment capacity "2" in the supply and demand adjustment market has been agreed upon between 15:00 and 18:00 (symbol F1). Also, it is assumed that the time slot between 18:30 and 19:00 is highly economical (i.e., the transaction unit price is high).

[0068] It is also assumed that "the transaction price during charging < the transaction price during discharging" holds true. The charge / discharge plan is determined taking into consideration the specifications (maximum charge amount, maximum output, etc.) of the resource 401 (storage battery). In some cases, charging may not be involved (for example, when a sell bid is made at 18:00).

[0069] First, at 14:15 (reference T5), the detection unit 11 detects the confirmation of the occurrence of surplus capacity. At 14:16, the market price prediction unit 22 performs a time-ahead market price prediction.

[0070] At 14:20, the optimal operation pattern calculation unit 31 calculates the most economical charge / discharge pattern. Here, it is assumed that the sell bid for the time slot F3 at 18:30 is calculated to be the most economical.

[0071] At 14:25, the market trading unit 53 makes a buying bid for the charging portion of the time slot F2 from 18:00 to 18:30.

[0072] At 14:30, the market trading unit 53 makes a selling bid for the confirmed spare capacity and charging capacity for the time slot F3 from 18:30 to 19:00. Then, it is assumed that both the buying bid and the selling bid are contracted. Then, the output control unit 51 sends an output command to the resource 401 (storage battery) according to an operation plan based on the charging and discharging pattern.

[0073] At 18:00, the resource 401 (storage battery) starts charging the amount of the buy bid in accordance with a command from the output control unit 51. At 18:30, the resource 401 (storage battery) completes charging in accordance with a command from the output control unit 51, and starts discharging the remaining capacity and the charged portion. At 19:00, the resource 401 (storage battery) completes discharging in accordance with a command from the output control unit 51.

[0074] Next, Fig. 9 is a flowchart showing a first process by the energy trading system 1 according to the embodiment. The first process includes a case where a margin occurs in relation to an activation command. This first process is executed every time an activation command based on the response time for each contract frame expires (every 30 minutes).

[0075] In step S10, the reception unit 10 determines whether or not an activation command (including a change command) has been received, and if Yes, the process proceeds to step S12, and if No, the process proceeds to step S11.

[0076] In step S11, the detection unit 11 detects the determination of the occurrence of surplus power.

[0077] In step S12, the detection unit 11 determines whether the occurrence of surplus power has been confirmed, and if Yes, the process proceeds to step S13, and if No, the process ends. Here, the detection unit 11 detects that the occurrence of surplus power has been confirmed when the output power instructed by the activation command is smaller than expected.

[0078] In step S 13 , the resource reserve calculation unit 12 calculates the reserve of the resource 401 and registers it in the DB 921 .

[0079] Next, in step S14, the market price prediction unit 22 predicts and calculates the time-ahead market price for the following time period, and registers it in the DB921.

[0080] Next, in step S15, the optimal operation pattern calculation unit 31 calculates an optimal operation pattern for subsequent trading of margin in the before-hours market 202 based on the information registered in the DB 921.

[0081] Next, in step S16 , the bidding plan creation unit 43 creates a bidding plan based on the optimal operation pattern, and submits a bid to the pre-hours market 202 via the market trading unit 53 .

[0082] Next, in step S17, the market trading unit 53 determines whether or not a contract has been concluded. If Yes, the process proceeds to step S18, and if No, the process ends.

[0083] In step S18, the power generation and sales plan creation unit 42 modifies the power generation and sales plan, and the power generation and sales plan output unit 52 submits the modified power generation and sales plan to the Agency for Cross-regional Coordination of Electric Power Generation 301.

[0084] Next, in step S19, the resource operation plan creation unit 41 creates an optimal operation plan (a charge and discharge plan in the case of a storage battery) for the resource 401 based on the optimal operation pattern.

[0085] Next, in step S20, the output control unit 51 sends an output command to the resource 401 in accordance with the operation plan when the contract time arrives.

[0086] 10 is a flowchart showing a second process performed by the energy trading system according to the embodiment. The second process includes a case where a surplus capacity occurs in relation to a DR activation order.

[0087] In step S31, the detection unit 11 determines whether or not DR has been initiated, and if Yes, detects the confirmation of the occurrence of surplus power and proceeds to step S32, and if No, ends the process. Steps S32 to S39 are the same as steps S13 to S20.

[0088] In this way, according to the power system S of the present embodiment, when the supply of power is contracted for a specified contract time period in the supply and demand adjustment market or the capacity market, when the generation of surplus power is confirmed, a sales transaction process for the surplus power is performed in the hourly market before the end of the contract time period. This makes it possible to more effectively utilize the surplus power contracted in the supply and demand adjustment market or the capacity market.

[0089] For example, by considering and appropriately placing bids in the aforesaid market 202 immediately after the generation of excess capacity is confirmed, excess capacity can be used efficiently to increase profitability.

[0090] In this case, profitability can be further increased by bidding for the most economical block of blocks available for bidding, based on, for example, a forecast of the market price of electricity.

[0091] In addition, for example, when the resource 401 is a storage battery, profitability can be further increased by creating the most economical charging and discharging pattern based on a forecast of the market price of electricity and bidding for it.

[0092] In addition, the power generation and sales plan is automatically revised after the bid and agreement for the surplus capacity and submitted to the Agency for Cross-regional Coordination of Transmission Operators 301, thereby reducing the workload of the user.

[0093] The programs executed by the energy trading system 1 of this embodiment may be provided in the form of an installable or executable file recorded on a computer-readable recording medium such as a CD-ROM, a flexible disk (FD), a CD-R, or a digital versatile disk (DVD).

[0094] The program may be stored on a computer connected to a network such as the Internet and provided by being downloaded via the network. The program may be provided or distributed via a network such as the Internet.

[0095] The program may also be provided in a state where it is pre-installed in a ROM or the like.

[0096] Although an embodiment of the present invention has been described, this embodiment is presented as an example and is not intended to limit the scope of the invention. This novel embodiment can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. This embodiment and its modifications are included in the scope and spirit of the invention, and are included in the invention and its equivalents described in the claims.

[0097] For example, in the above embodiment, all operations from generation of surplus capacity to output control to the resource 401 are performed automatically by the energy trading system 1, but some of the operations may be performed manually.

[0098] The energy trading system 1 may also be realized by cloud computing. [Explanation of symbols]

[0099] 1...Electricity trading system, 10...Reception unit, 11...Detection unit, 12...Resource reserve calculation unit, 21...Market price information acquisition unit, 22...Market price prediction unit, 31...Optimal operation pattern calculation unit, 41...Resource operation plan creation unit, 42...Power generation sales plan creation unit, 43...Bidding plan creation unit, 51...Output control unit, 52...Power generation sales plan output unit, 53...Market trading unit, 91...Processing unit, 92...Memory unit, 93...Input unit, 94...Output unit, 101...General electricity transmission and distribution company, 201...Japan Electric Power Exchange, 202...Hour-ahead market, 301...Organization for Cross-regional Coordination of Electric Power Companies, 401...Resource, 921...DB, S...Electricity system

Claims

1. a detection unit that detects that generation of surplus power has been confirmed for a power supply that has been agreed upon for a predetermined contract time period in a supply and demand balancing market or a capacity market; and a market trading unit that, when the detection unit detects that the generation of the surplus electricity has been confirmed, performs a sales trading process for the surplus electricity in the pre-hour market before the end of the contract time period.

2. In the supply and demand adjustment market, when a contract is made for the supply of electricity from a power source resource having a capacity constraint on the amount of electricity during a specified contract time period, 2. The energy trading device according to claim 1, wherein the detection unit detects that generation of surplus power for the power has been confirmed when no activation command has been received by a deadline for the activation command based on a response time of the power source resource, or when an activation command has been received and the specified output power is lower than expected.

3. In the capacity market, when a contract is made for the supply of electricity from a power source resource having a capacity constraint on the amount of electricity during a specified contract time period, The energy trading device according to claim 1 , wherein the detector detects that generation of surplus power for the power has been confirmed when an activation command has not been received within a time limit for the activation command.

4. 3. The energy trading device according to claim 2, wherein the market trading unit, when performing a sales trading process for the surplus energy in the pre-hour market, places a bid for the most economical frame among frames available for bidding based on a market price forecast for energy.

5. When the power source resource is a storage battery, 5. The energy trading device according to claim 4, wherein the market trading unit, when performing a sales trading process for the surplus energy in the pre-hour market, submits a bid for the most economical charging / discharging pattern for the storage battery based on a market price forecast of energy.

6. the market trading unit submits a bid to the time-ahead market every time the generation of the surplus electricity is confirmed; The energy trading device includes: a power generation sales plan creation unit that modifies a power generation sales plan when a contract is made in the time-ahead market; The energy trading device according to claim 4 , further comprising: a power generation sales plan output unit that submits the revised power generation sales plan to a predetermined organization.

7. A detection step in which, when a supply of electricity is agreed upon for a predetermined contract time period in a supply and demand adjustment market or a capacity market, a detection unit detects that generation of surplus electricity has been confirmed for the electricity; a market trading step in which, when the detection step detects that the generation of the surplus electricity has been confirmed, a market trading unit performs a sales trading process for the surplus electricity in a pre-time market before the end of the agreement time period.

8. Computer, a detection unit that detects that generation of surplus power has been confirmed for a power supply that has been agreed upon for a predetermined contract time period in a supply and demand balancing market or a capacity market; A program for causing the program to function as a market trading unit that, when the detection unit detects that the occurrence of the surplus electricity has been confirmed, performs sales trading processing for the surplus electricity in the pre-time market before the end of the contract time period.

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