A method for compensating for the capacity of a storage subject considering a spread contract

Abstract

The application discloses a kind of energy storage main body capacity compensation method considering spread contract, first, combine spot electricity energy market and the data such as electricity and price of spread contract, establish the net income calculation model of coal-fired generating unit and electrochemical energy storage, analyze the net income and fixed cost recovery of each main body in electricity energy market;Then, according to the related concepts such as reliability evaluation index of power generation equipment, establish coal-fired generating unit, energy storage and system adequacy assessment model;Finally, considering the factors such as spread contract electricity, system adequacy, the calculation method of coal-fired generating unit and energy storage compensation capacity and compensation price is proposed, the capacity cost recovery mechanism of coal-fired generating unit and energy storage is established, effectively help market main body to shorten fixed cost investment recovery period.

Description

Technical Field

[0001] This invention relates to a method for compensating the capacity of energy storage entities by taking into account contracts for difference, and belongs to the technical field of supporting mechanisms for the electricity spot market. Background Technology

[0002] In an ideal electricity spot market environment, various generating units typically quote prices based on short-term marginal costs. For units with low marginal costs, the clearing price in the electricity market is much higher than their quoted price, thus allowing them to recover their fixed investment costs. However, for units with high marginal costs, the clearing price in the electricity market is close to their variable costs, making it impossible to recover the fixed costs of such units. For electrochemical energy storage, due to its high unit capacity cost, simply profiting from "low storage, high generation" arbitrage in the electricity market is insufficient to recover its fixed investment costs. Furthermore, with the high proportion of renewable energy sources with extremely low short-term marginal costs being integrated into the market, the phenomenon that the fixed costs of various generating units and energy storage cannot be recovered solely through the electricity spot market will become even more pronounced. Therefore, a capacity compensation mechanism is needed to shorten the fixed investment cost recovery period for coal-fired units and energy storage.

[0003] my country's electricity market is currently in a phase of parallel "planning" and "market" mechanisms. Thermal power plants can secure their profits by signing medium- and long-term differential contracts (CLCs). When finalizing electricity prices through CLCs, companies consider the recovery of fixed investment costs for generating units. However, existing capacity cost compensation methods only consider the available capacity of coal-fired units, hydropower, and renewable energy power plants, without deducting the capacity portion corresponding to the CLC-contracted electricity volume. This results in users paying for this capacity portion twice, and there are no quantitative and pricing methods for capacity compensation for new electricity market players such as electrochemical energy storage. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a capacity compensation method for energy storage entities that takes into account price difference contracts, thereby solving the problem of revenue loss from a single electricity market in existing technologies.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A method for compensating the capacity of energy storage entities that takes into account contracts for difference (CFP) includes the following steps:

[0007] Based on the electricity price and volume in the electricity market and contracts for difference, net revenue models for coal-fired power units and net revenue models for electrochemical energy storage are established respectively.

[0008] The adequacy of the system is determined based on the reliability indicators of the power generation equipment, the system reserve margin, and the peak load.

[0009] Based on the electricity volume of the price difference contract and the adequacy of the system, calculate the compensation capacity of the coal-fired power unit, the compensation capacity of the electrochemical energy storage, and the compensation price;

[0010] Based on the aforementioned calculations of the compensation capacity of coal-fired power units, the compensation capacity of electrochemical energy storage, and the compensation price, the compensation costs for coal-fired power units and electrochemical energy storage, as well as the capacity compensation electricity price for users, are derived. The capacity compensation for the main energy storage system is achieved by collecting the capacity compensation electricity price from users.

[0011] Furthermore, the steps for establishing the aforementioned net revenue model for coal-fired power units include:

[0012] Calculate the electricity output of the differential contract for coal-fired power units:

[0013] In the formula, The breakdown of the electricity volume under the price difference contract for the i-th coal-fired unit on day d, during time period t. For the differential contract electricity volume of the i-th coal-fired unit, The system power consumption during time period t on day d. Let y be the system's electricity consumption in year y;

[0014] Calculate the total fuel cost of a coal-fired power unit:

[0015] In the formula, Let a be the total fuel cost of the i-th coal-fired unit during period t on day d. i b i c i Let P be the first power generation cost parameter, the second power generation cost parameter, and the third power generation cost parameter of the i-th coal-fired unit. i,t For the output of the i-th coal-fired unit during the time period, μ fuel This represents the unit price of coal for the current season.

[0016] based on and Calculate the daily net revenue of coal-fired power units:

[0017]

[0018] In the formula, PR d,i For the net revenue of the i-th coal-fired unit on day d, N T For the total number of time periods considered, P is the clearing price for time period t on day d. d,i,t Let Δt be the output of the i-th coal-fired unit on day d during time period t, where Δt is the length of a single time period. Finalize the price for the contract for difference (CFD) for period t on day d;

[0019] Based on PR d,i Calculate the annual net income of coal-fired power units:

[0020] In the formula, PR y,i For the net income of the i-th coal-fired unit in year y, N D This refers to the number of days counted within a year.

[0021] Furthermore, the steps for establishing the aforementioned electrochemical energy storage net benefit model include:

[0022] Calculate the daily net benefit of electrochemical energy storage:

[0023] In the formula, For the net benefit of electrochemical energy storage on day d, These are the discharge power and charging power during the b-th electrochemical energy storage period t, respectively.

[0024] based on Calculate the annual net income of electrochemical energy storage:

[0025] In the formula, This represents the net revenue from the b-th electrochemical energy storage unit in year y.

[0026] Furthermore, the calculation steps for the sufficiency of the aforementioned system include:

[0027] Calculate the available capacity of coal-fired power units: in

[0028]

[0029] AH i =SH i +RH i (8b)

[0030] PH i =AH i +POH i +UOH i (8c)

[0031] In the formula, For the available capacity of the i-th coal-fired unit, AF i Let be the availability factor of the i-th coal-fired unit; Let AH be the installed capacity of the i-th coal-fired unit. i For the available hours of the i-th coal-fired unit, SH i For the operating hours of the i-th coal-fired unit, RH i For the standby hours of the i-th coal-fired unit, PH i For the statistical period of the i-th coal-fired unit, in hours, POH i For the planned outage hours of the i-th coal-fired unit, UOHi For the unplanned outage hours of the i-th coal-fired unit;

[0032] Calculate the available capacity of the hydropower unit: in

[0033]

[0034] AH w =SH w +RH w (10b)

[0035] PH w =AH w +POH w +UOH w (10c)

[0036] In the formula, For the available capacity of the wth hydropower unit, AF w Let w be the availability factor of the w-th hydropower unit. For the installed capacity of the wth hydropower unit, AH w For the available hours of the wth hydropower unit, SH w For the operating hours of the wth hydropower unit, RH w For the standby hours of the wth hydropower unit, PH w For the statistical period of the wth hydropower unit, POH w For the planned outage hours of the wth hydropower unit, UOH w For the unplanned outage hours of the wth hydropower unit;

[0037] Calculate the available capacity of new energy power plants and the available capacity of electrochemical energy storage Among them, the available capacity of the r-th new energy power station Given the average actual output during the x1 hours of peak system load within a year, the available capacity of the b-th electrochemical energy storage unit. It is the average actual discharge power during the x2 hours of the highest system load within one year;

[0038] The available capacity of the system is calculated based on the available capacity of coal-fired power units, hydropower units, new energy power plants, and electrochemical energy storage.

[0039]

[0040] In the formula, EC represents the available capacity of the system. Let r be the available capacity of the r-th renewable energy power station. For the available capacity of the b-th electrochemical energy storage, N GN represents the number of coal-fired power units. HY N represents the number of hydropower units. RE N represents the total number of new energy power stations. B This represents the total electrochemical energy storage.

[0041] Calculate the system's sufficiency based on its available capacity:

[0042] In the formula, β represents the sufficiency of the system, and D peak γ represents the average of the z highest loads in the system during the year, and γ represents the system's reserve requirement.

[0043] Furthermore, the calculation steps for the aforementioned compensation price include:

[0044] Calculate the annualized depreciation cost per unit capacity:

[0045] In the formula, Let r be the annualized depreciation cost per unit capacity of the coal-fired power unit, and l be the discount rate of the coal-fired power unit. th For the lifespan of coal-fired power units, The unit capacity construction investment cost of coal-fired power units;

[0046] based on Calculate the unit capacity compensation price:

[0047] In the formula, ρ sub The compensation price is per unit capacity.

[0048] Furthermore, the calculation steps for the capacity compensation electricity price for the aforementioned users include:

[0049] Calculate the compensation capacity of coal-fired power units and the compensation capacity of electrochemical energy storage:

[0050]

[0051]

[0052]

[0053] In the formula, Let i be the compensation capacity of the i-th coal-fired unit. For the compensation capacity of the b-th electrochemical energy storage, P i th,c Let i be the long-term contract capacity of the i-th coal-fired unit. For the medium- and long-term contracted electricity volume of the i-th coal-fired unit, H i Let be the annual utilization hours of the i-th coal-fired unit;

[0054] based on and Calculate the total system compensation capacity cost:

[0055] in,

[0056]

[0057]

[0058] In the formula, G i Let ω2 be the annual revenue from capacity compensation for the i-th coal-fired power unit in the market, and let ω2 be the capacity compensation coefficient for the electrochemical energy storage power station. For the capacity compensation annual revenue of the bth electrochemical energy storage power station in the market, G sys Subsidies for the annual market capacity of the entire system;

[0059] Based on G sys Calculate the capacity compensation electricity price for users:

[0060] In the formula, ρ e Q is the capacity compensation price for users. load This represents the system's total annual electricity consumption.

[0061] The beneficial effects achieved by this invention are as follows:

[0062] 1. The method provided by this invention evaluates the available capacity of coal-fired power units based on established power generation equipment reliability indicators, avoiding cumbersome calculation processes;

[0063] 2. The method provided by this invention deducts the capacity corresponding to the electricity volume of the price difference contract during the process of determining the compensation capacity, thereby avoiding repeated payments of fixed investment costs for coal-fired units and reducing the burden of cost sharing for users.

[0064] 3. The method provided by this invention is based on the unit capacity compensation price of coal-fired power units to compensate the capacity of energy storage power stations. This helps to gradually advance the capacity compensation mechanism from coal-fired power units to new market players such as energy storage, and can effectively shorten the investment recovery cycle of coal-fired power units and energy storage power stations. Attached Figure Description

[0065] Figure 1 This is a flowchart illustrating the calculation process of the method implemented in this invention. Detailed Implementation

[0066] The technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments and specific features in the embodiments are detailed descriptions of the technical solution of the present application, rather than limitations thereof. In the absence of conflict, the embodiments and technical features in the embodiments can be combined with each other.

[0067] This embodiment addresses the revenue shortfall issue in the electricity spot market by disclosing a capacity compensation method for energy storage entities that takes into account contracts for difference (CPDs). First, combining the electricity price and volume from the electricity market and CPDs, a net revenue model for coal-fired power units and a net revenue model for electrochemical energy storage are established to determine whether a capacity cost compensation mechanism should be initiated under the current electricity spot market environment. Next, considering the reliability indicators of generating equipment, system reserve margin, and peak load, the system adequacy is determined. Then, taking into account factors such as CPD volume and system adequacy, the compensation capacity and compensation price for coal-fired power units and electrochemical energy storage are calculated. Finally, based on the calculated compensation capacity and compensation price for coal-fired power units and electrochemical energy storage, a method for calculating the compensation cost for coal-fired power units and electrochemical energy storage, as well as the capacity compensation electricity price for users, is proposed.

[0068] The specific steps are as follows:

[0069] Step S1: Combining data on electricity volume and price from the spot electricity market and contracts for difference (CFDs), establish a net revenue calculation model for coal-fired power units and electrochemical energy storage, and analyze whether the net revenue from the electricity market can recover fixed investment costs.

[0070] S1-1: The breakdown calculation of the electricity volume under the differential contract for coal-fired power units is shown in expression (1);

[0071]

[0072] In the formula, The difference in contract power output (MWh) for the i-th coal-fired unit on day d during time period t. The difference in contracted electricity volume (MWh) for the i-th coal-fired unit; The system power consumption (MWh) for time period t on day d; Let MWh be the system electricity consumption in year y.

[0073] S1-2: The calculation of the daily net income of the coal-fired unit in the contract for difference is as shown in expression (2), the calculation of the total fuel cost of the coal-fired unit is as shown in expression (3), and the calculation of the annual net income of the coal-fired unit is as shown in expression (4).

[0074]

[0075]

[0076]

[0077] In the formula, N T N represents the total number of time periods considered. D The number of days counted within a year; PR d,i The net revenue (in yuan) of the i-th coal-fired unit on day d; P is the clearing price for period t on day d (yuan / MWh); d,i,t Δt represents the output (MW) of the i-th coal-fired unit on day d during time period t; Δt represents the length of a single time period (h). Finalize the price (RMB / MWh) for the contract for difference in time period t on day d; The difference in contracted electricity volume (MWh) for the i-th coal-fired unit on day d during time period t; P represents the total fuel cost (in yuan) for the i-th coal-fired unit during time period t on day d; i,t The output (MW) of the i-th coal-fired unit during the specified time period; μ fuel μ fuel The unit coal price for the current season (yuan / ton); a i b i c i The first power generation cost parameter (tons / MW) for the i-th coal-fired unit is shown below. 2 Second power generation cost parameter (tons / MW) 2 ), third power generation cost parameter (tons); PR y,i The net revenue (in yuan) of the i-th coal-fired unit in year y.

[0078] S1-3: The calculation of the daily net income of electrochemical energy storage is shown in expression (5), and the calculation of the annual net income of electrochemical energy storage is shown in expression (6):

[0079]

[0080]

[0081] In the formula, The net revenue (in yuan) of the b-th electrochemical energy storage on day d; These are the discharge power and charging power (MW) of the b-th electrochemical energy storage period t, respectively; The net revenue (in yuan) for the b-th electrochemical energy storage in year y.

[0082] Step S2: Based on relevant concepts such as power generation equipment reliability evaluation indicators, establish an assessment model for coal-fired units, electrochemical energy storage, and system adequacy.

[0083] S2-1: The calculation of the available capacity of the coal-fired unit is as shown in expression (7), the calculation of the available coefficient of the coal-fired unit is as shown in expression (8a), the calculation of the available hours of the coal-fired unit is as shown in expression (8b), and the calculation of the statistical time of the coal-fired unit is as shown in expression (8c).

[0084]

[0085]

[0086] AH i =SH i +RH i (8b)

[0087] PH i =AH i +POH i +UOH i (8c)

[0088] In the formula, Let be the available capacity (MW) of the i-th coal-fired unit; AF i Let be the availability factor of the i-th coal-fired unit; Let AH be the installed capacity (MW) of the i-th coal-fired unit; i The available hours (h) for the i-th coal-fired unit; SH i The operating hours (h) of the i-th coal-fired unit; RH i The standby hours (h) for the i-th coal-fired unit; PH i The statistical period for the i-th coal-fired unit is in hours (h); POH i The planned outage hours (h) for the i-th coal-fired unit; UOH i The unplanned outage hours (h) of the i-th coal-fired unit.

[0089] S2-2: The calculation of the available capacity of the hydropower unit is as shown in expression (9), the calculation of the available coefficient of the hydropower unit is as shown in expression (10a), the calculation of the available hours of the hydropower unit is as shown in expression (10b), and the calculation of the statistical time of the hydropower unit is as shown in expression (10c).

[0090]

[0091]

[0092] AH w =SH w +RH w (10b)

[0093] PH w =AH w +POH w +UOH w (10c)

[0094] In the formula, The available capacity (MW) of the wth hydropower unit; AF w Let w be the availability factor of the w-th hydropower unit; The installed capacity (MW) of the wth hydropower unit; AH w The available hours (h) for the wth hydropower unit; SH wThe operating hours (h) of the wth hydropower unit; RH w The standby hours (h) for the wth hydropower unit; PH w The statistical period (hours) for the wth hydropower unit; POH w The planned downtime hours (h) for the wth hydropower unit; UOH w The unplanned downtime hours (h) of the wth hydropower unit.

[0095] S2-3: Available capacity of the r-th renewable energy power station Given the average actual output during the x1 hours of peak system load within a year, the available capacity of the b-th electrochemical energy storage unit. It is the average actual discharge power during the x2 hours of the highest system load within one year;

[0096] S2-4: The system's available capacity is calculated as shown in expression (11), and the system's adequacy is calculated as shown in expression (12).

[0097]

[0098]

[0099] In the formula, EC represents the available capacity of the system (MW); N G N represents the number of coal-fired power units. HY N represents the number of hydropower generating units. RE N represents the total number of new energy power stations. B γ represents the total number of electrochemical energy storage units; γ represents the system reserve requirement (%); β represents the system adequacy ratio; D peak The sufficiency β is the average value (MW) of the z highest centrally dispatched loads of the system in that year; when the sufficiency β < 1, it indicates that the system capacity is not sufficient; when the sufficiency β ≥ 1, it indicates that the system capacity is sufficient.

[0100] Step S3: Considering factors such as the electricity volume under the differential contract and the system adequacy, propose calculation methods for the compensation capacity of coal-fired power units, the compensation capacity of electrochemical energy storage, and the compensation price;

[0101] S3-1: The calculation of the medium- and long-term contract capacity of coal-fired units is as shown in expression (13), the calculation of the compensation capacity of coal-fired units is as shown in expression (14), and the calculation of the compensation capacity of electrochemical energy storage is as shown in expression (15).

[0102]

[0103]

[0104]

[0105] In the formula, Pi th,c Let be the medium- and long-term contract capacity (MW) of the i-th coal-fired unit; The medium- and long-term contracted electricity volume (MWh) for the i-th coal-fired unit; H i EC represents the annual utilization hours (h) of the i-th coal-fired unit. i th,sub EC represents the compensation capacity (MW) of the i-th coal-fired unit. b bess,sub Let be the compensation capacity (MW) of the b-th electrochemical energy storage.

[0106] S3-2: The calculation of annualized depreciation cost per unit capacity is as shown in expression (16), and the calculation of compensation price per unit capacity is as shown in expression (17).

[0107]

[0108]

[0109] In the formula, ρ is the annualized depreciation cost per unit capacity of the coal-fired power unit (RMB / MW); r is the discount rate (%) for the coal-fired power unit; l th The lifespan (in years) of a coal-fired power unit; The unit capacity construction investment cost of coal-fired power units (RMB / MW); ρ sub The unit capacity compensation price is (RMB / MW).

[0110] Step S4: Based on the calculated compensation capacity and compensation price of coal-fired power units and electrochemical energy storage, establish a method for calculating the compensation cost of coal-fired power units and electrochemical energy storage, as well as the capacity compensation electricity price for users. The capacity of the energy storage entity is compensated by collecting the capacity compensation electricity price from users, so as to shorten the fixed investment cost recovery period of the energy storage entity.

[0111] S4-1: The annual revenue of a coal-fired power unit based on its compensation capacity is calculated as shown in expression (18), the annual revenue of an electrochemical energy storage power station based on its compensation capacity is calculated as shown in expression (19), and the compensation capacity cost of the entire system is calculated as shown in expression (20).

[0112]

[0113]

[0114]

[0115] In the formula, G i ω1 represents the annual revenue (in yuan) from capacity compensation for the i-th coal-fired power unit in the market; ω2 represents the capacity compensation coefficient for the electrochemical energy storage power station. The annual revenue (in yuan) for capacity compensation of the bth electrochemical energy storage power station in the market; G sys The annual capacity subsidy fee (in yuan) for the entire system participating in the market.

[0116] S4-2: The capacity compensation electricity price charged by the user side is calculated as shown in expression (21).

[0117]

[0118] In the formula, ρ e Capacity compensation electricity price for users (RMB / MWh); Q load This represents the system's total annual electricity consumption (MWh).

[0119] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for capacity compensation of energy storage entities taking into account contracts for difference, characterized in that, Includes the following steps: Based on the electricity price and volume in the electricity market and contracts for difference, net revenue models for coal-fired power units and net revenue models for electrochemical energy storage are established respectively. The adequacy of the system is determined based on the reliability indicators of the power generation equipment, the system reserve margin, and the peak load. Based on the electricity volume of the price difference contract and the adequacy of the system, calculate the compensation capacity of the coal-fired power unit, the compensation capacity of the electrochemical energy storage, and the compensation price; Based on the aforementioned calculations of the compensation capacity of coal-fired power units, the compensation capacity of electrochemical energy storage, and the compensation price, the compensation costs for coal-fired power units and electrochemical energy storage, and the capacity compensation electricity price for users are derived. The capacity compensation for the main energy storage system is achieved by collecting the capacity compensation electricity price from users. The steps for calculating the adequacy of the system include: Calculate the available capacity of coal-fired power units: (7), of which （8a） （8b） （8c） In the formula, For the first The available capacity of the coal-fired power units. For the first Availability factor of coal-fired power units; For the first The installed capacity of the coal-fired power units in Taiwan For the first Available hours of the coal-fired power unit For the first Operating hours of the coal-fired power unit For the first Standby hours for a coal-fired power unit. For the first The statistical period for the coal-fired power units in Taiwan was [number] hours. For the first Planned shutdown hours for Taiwan's coal-fired power units For the first Unplanned outage hours of coal-fired power units in Taiwan; Calculate the available capacity of the hydropower unit: (9), of which （10a） （10b） （10c） In the formula, For the first Available capacity of the hydroelectric power unit For the first The availability factor of the hydroelectric power unit For the first The installed capacity of the hydroelectric power units in Taiwan For the first Available hours of the hydroelectric power unit For the first Operating hours of the hydroelectric power unit For the first The standby hours of the hydroelectric power unit For the first The statistical period for the Taiwan hydroelectric power units was [number] hours. For the first Planned shutdown hours for Taiwan hydroelectric power units For the first Unplanned outage hours of Taiwan hydroelectric power units; Calculate the available capacity of new energy power plants and the available capacity of electrochemical energy storage Among them, the first Available capacity of each new energy power station The system with the highest load during the year Average actual output per hour, available capacity of the b-th electrochemical energy storage The system with the highest load during the year Average actual discharge power over one hour; The available capacity of the system is calculated based on the available capacity of coal-fired power units, hydropower units, new energy power plants, and electrochemical energy storage. （11） In the formula, For the available capacity of the system, For the first The available capacity of each new energy power station For the available capacity of the b-th electrochemical energy storage, This refers to the number of coal-fired power units. This refers to the number of hydropower units. This represents the total number of new energy power stations. This represents the total electrochemical energy storage. Calculate the system's sufficiency based on its available capacity: (12) In the formula, For the system's sufficiency, For the system that year The average of the highest centrally dispatched loads, This is for system backup requirements.

2. The energy storage entity capacity compensation method taking into account price difference contracts as described in claim 1, characterized in that, The steps for establishing the net revenue model for the coal-fired power unit include: Calculate the electricity output of the differential contract for coal-fired power units: (1), In the formula, For the first Heavenly Taiwan coal-fired power unit time period The difference in electricity volume is determined by the contract for difference. For the first The difference in contracted electricity volume between the coal-fired power units and the price difference. For the first Daytime The system's power consumption, For the first Annual system power consumption; Calculate the total fuel cost of a coal-fired power unit: (3), In the formula, For the first Heavenly Taiwan coal-fired power unit time period Total fuel cost, , , The first The first, second, and third power generation cost parameters of a coal-fired power unit. For the first The output of the coal-fired power units during the period. This represents the unit price of coal for the current season. based on and Calculate the daily net revenue of coal-fired power units: （2） In the formula, For the first Heavenly Net revenue of Taiwan coal-fired power units For the total number of time periods considered, For the first Daytime Clearing electricity price, For the first Heavenly Taiwan coal-fired power unit time period of efforts, For the length of a single time period, For the first Daytime The price was finalized in the contract for difference. based on Calculate the annual net income of coal-fired power units: (4) In the formula, For the first Year Net revenue of Taiwan coal-fired power units This refers to the number of days counted within a year.

3. The energy storage entity capacity compensation method taking into account price difference contracts as described in claim 2, characterized in that, The steps for establishing the electrochemical energy storage net benefit model include: Calculate the daily net benefit of electrochemical energy storage: (5) In the formula, For the first Heavenly Net benefit of electrochemical energy storage , The first Electrochemical energy storage period The discharge power and charging power; based on Calculate the annual net revenue of electrochemical energy storage: (6) In the formula, For the first Year Net revenue from electrochemical energy storage.

4. The energy storage entity capacity compensation method taking into account price difference contracts as described in claim 1, characterized in that, The calculation steps for the compensation price include: Calculate the annualized depreciation cost per unit capacity: (16) In the formula, The annualized depreciation cost per unit capacity of a coal-fired power unit. The discount rate for coal-fired power units. For the lifespan of coal-fired power units, The unit capacity construction investment cost of coal-fired power units; based on Calculate the unit capacity compensation price: (17) In the formula, The compensation price is per unit capacity.

5. The energy storage entity capacity compensation method taking into account price difference contracts according to claim 4, characterized in that, The calculation steps for the capacity compensation electricity price for the user include: Calculate the compensation capacity of coal-fired power units and the compensation capacity of electrochemical energy storage: （14） （15） （13） In the formula, For the first Compensation capacity of coal-fired power units For the compensation capacity of the b-th electrochemical energy storage, For the first The medium- and long-term contract capacity of Taiwan's coal-fired power units. For the first Medium- and long-term contracted electricity volume for Taiwan's coal-fired power units For the first Annual utilization hours of coal-fired power units; based on and Calculate the total system compensation capacity cost: (20) in, （18） （19） In the formula, For the market Annual revenue from capacity compensation for each coal-fired power unit This is the capacity compensation coefficient for the electrochemical energy storage power station. For the market Annual revenue from capacity compensation of an electrochemical energy storage power station Subsidies for the annual market capacity of the entire system; based on Calculate the capacity compensation electricity price for users: (twenty one) In the formula, The capacity compensation price for users, This represents the system's total annual electricity consumption.

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