Calculation method of coal capacitance electricity price

Abstract

The invention provides a coal electricity capacity electricity price calculation method. The method comprises the following steps: obtaining capacity cost related data of a coal electricity generator set of a power generation system; determining the total capacity cost of the coal power generator set of the power generation system based on the capacity cost related data; based on the total capacity cost of the coal power generator set of the power generation system; determining the time capacity electric charge which should be allocated by each power plant in each month and the space capacity electric charge which should be allocated by each power plant in each month; and based on the time capacity electricity charge which should be allocated by each power plant in each month and the space electricity charge which should be allocated by each power plant in each month, determining the coal electricity capacity electricity price of each power plant in each month. By reflecting the supply and demand conditions of different time and space in the power system, the optimal configuration of power generation and power utilization resources can be effectively guided.

Description

Technical Field

[0001] The present application relates to the field of power grids, and in particular to the field of electricity price setting. Background Art

[0002] The capacity price of coal-fired power is determined by recovering a certain proportion of the fixed costs of coal-fired power units, and the electricity price is formed through market-oriented means. The capacity price mechanism of coal-fired power in the power market is a major reform of the coal-fired power price formation mechanism. It has achieved remarkable results in the past year. However, the capacity price has no time signal or implements different capacity prices according to different seasons or time periods, which does not match the difference in capacity value in different seasons such as summer or time periods such as peak periods in the operation of the power system. The capacity in summer and winter or the capacity in peak periods has completely different values ​​compared to the capacity in spring, autumn or valley periods. In addition, the capacity price is currently calculated only according to the declared maximum output, without taking into account the actual utilization results and the importance of the position of the capacity price.

[0003] Therefore, how to determine a more reasonable coal-fired power capacity electricity price that can comprehensively differentiate according to seasons, time periods and the location of coal-fired power units is an issue that needs to be urgently addressed. Summary of the invention

[0004] In order to overcome the above technical defects, this application provides a method for calculating the capacity electricity price of coal-fired power.

[0005] To achieve the above objectives, this application is implemented according to the following technical solutions:

[0006] This application provides a method for calculating the capacity price of coal-fired power, including:

[0007] Obtain data related to the capacity cost of coal-fired power generation units in the power generation system;

[0008] Determining the total capacity cost of the coal-fired power generation units of the power generation system based on the capacity cost related data;

[0009] Based on the total capacity cost of the coal-fired power generating units of the power generation system; determining the time capacity electricity charges to be allocated to each power plant each month and the space capacity electricity charges to be allocated to each power plant each month;

[0010] The coal-fired power capacity electricity price of each power plant each month is determined based on the time capacity electricity fee that each power plant should share each month and the space electricity fee that each power plant should share each month.

[0011] Optionally, the step of determining the time capacity electricity fee to be apportioned to each power plant in the power generation system in each month based on the power generation capacity cost-related data comprises:

[0012] Obtain the annual time series load curve of coal-fired power generating units in the power generation system;

[0013] Based on the total capacity cost and the annual time-series load curve, the time capacity electricity fee to be allocated to each power plant in the power generation system in each month is determined.

[0014] Optionally, determining the time capacity electricity fee to be allocated to each power plant in each month based on the total capacity cost and the annual time series load curve includes:

[0015] Based on the annual time series load curve, a continuous load curve is determined, wherein the continuous load curve is arranged from high to low according to the load size into a peak period, a normal period, and a valley period;

[0016] Based on the continuous load curve and the total capacity cost, the time capacity electricity fee to be allocated to each power plant each month is determined.

[0017] Optionally, determining the time capacity electricity fee to be shared by each power plant based on the continuous load curve and the total capacity cost includes:

[0018] On the continuous load curve, the total annual electricity consumption of the coal-fired power generating unit is horizontally divided to obtain each divided electricity block;

[0019] Based on the total capacity cost and the divided electricity blocks, determining the unit capacity cost allocated to each unit of electricity at the same load level;

[0020] Based on the unit capacity cost, determine the capacity cost that each power block needs to bear after the segmentation;

[0021] Based on the capacity cost required to be borne by each divided electricity block, determine the capacity cost sharing value corresponding to the load level of each power plant after accumulating each divided electricity block;

[0022] Based on the capacity cost sharing value corresponding to each load level and the load level of each power plant, the time capacity electricity fee to be shared by each power plant in each month is determined.

[0023] Optionally, based on the total capacity cost of the coal-fired power generating units of the power generation system, the space capacity electricity fee to be allocated to each power plant in each month is determined, including:

[0024] Obtain the utilization hour allocation coefficient of the coal-fired power generation units in the power generation system each month;

[0025] Based on the utilization hour allocation coefficient of each month and the total capacity cost of the coal-fired power generation units of the power generation system; determining the monthly allocation benchmark value of each power plant;

[0026] Obtain the utilization hour coefficient of each power plant each month and the monthly coefficient of each power plant;

[0027] Based on the monthly allocation base value of each power plant, the monthly utilization hour coefficient of each power plant, and the monthly coefficient of each power plant, the space capacity electricity fee that each power plant should share is determined.

[0028] Optionally, the step of obtaining the utilization hour allocation coefficient of the coal-fired power generation unit of the power generation system each month includes:

[0029] Obtain utilization hour data of coal-fired power units in each power plant;

[0030] Based on the utilization hour data of the coal-fired power generating units of each power plant, determine the average utilization hours and the total average utilization hours of the coal-fired power generating units of each power plant in each month;

[0031] Based on the average utilization hours and total utilization hours of the coal-fired power generating units of each power plant each month, the utilization hour allocation coefficient of the coal-fired power generating units of the power generation system each month is determined.

[0032] Optionally, before the step of obtaining the monthly utilization hour coefficient of each power plant and the monthly coefficient of each power plant, the step further includes:

[0033] Determine the utilization hour coefficient of each power plant per month based on the average hours of the coal-fired power generating units of each power plant per month;

[0034] Based on the utilization hour coefficient of each power plant each month, a monthly coefficient of each power plant is determined.

[0035] Optionally, it is characterized in that the coal power capacity electricity price is determined based on the time capacity electricity fee to be allocated to each power plant of the power generation system each month and the space electricity fee to be allocated to each power plant each month, including:

[0036] Obtaining time signal coefficients and space signal coefficients;

[0037] The coal-fired power capacity electricity price is determined based on the time capacity electricity charges that each power plant should share each month and the time signal coefficient, and the space electricity charges that each power plant should share each month and the space signal coefficient.

[0038] This application has the following beneficial effects:

[0039] The coal-fired power capacity electricity price calculation method mentioned in this application reflects the supply and demand conditions at different times and spaces in the power system, can effectively guide the optimal allocation of power generation and power consumption resources, can optimize the operation of coal-fired power projects and even investment and reasonable electricity consumption of users through capacity electricity prices and their market price time and space signals, promote optimal resource allocation, improve the utilization rate of coal-fired power units and reduce user electricity prices, form an effective power supply guarantee mechanism, and effectively connect with the capacity compensation mechanism under the power spot market.

[0040] In addition to the above-described purposes, features and advantages, the present application has other purposes, features and advantages. The present application will be further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments and descriptions of the present application are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0042] Figure 1 It is a flow chart of a method for calculating the coal-fired power capacity electricity price provided in this application.

[0043] Figure 2 It is a schematic diagram of the load data of the coal-fired power generation units in the power generation system provided in this application.

[0044] Figure 3 It is a schematic diagram of the continuous load curve provided by this application. DETAILED DESCRIPTION

[0045] The embodiments of the present application are described in detail below with reference to the accompanying drawings; however, the present application can be implemented in many different ways as defined and covered by the claims.

[0046] The capacity price of coal-fired power is determined by recovering a certain proportion of the fixed cost of coal-fired power units, and the electricity price is formed in a market-oriented manner. The capacity price mechanism of coal-fired power in the power market is a major reform of the coal-fired power price formation mechanism. It has achieved significant results in the past year of implementation. However, the capacity price has no time signal or implements different capacity prices according to different seasons or time periods, which does not match the difference in capacity value in different seasons such as summer or time periods such as peak periods in the operation of the power system. The capacity in summer and winter or the capacity in peak periods has completely different values ​​compared to the capacity in spring, autumn or valley periods. And the capacity price is currently calculated only according to the declared maximum output, without taking into account the actual utilization results and the importance of the position of the capacity price. Therefore, in order to solve this problem, this application proposes a method for calculating the capacity price of coal-fired power. First, the total capacity cost of the power generation system is calculated, and then, based on the total capacity cost of the power generation system, the time capacity electricity fee to be shared by each power plant each month and the space electricity fee to be shared by each power plant each month are calculated respectively, thereby determining the final capacity price of coal-fired power.

[0047] like Figure 1 As shown, this application proposes a method for calculating the coal power capacity price, including:

[0048] Step S101: Acquire capacity cost related data of coal-fired power generation units in a power generation system;

[0049] The power generation system refers to a combination of equipment, facilities and related technologies that convert other forms of energy into electrical energy. The core part of energy conversion includes various types of generator sets, such as coal-fired generator sets and steam turbine generator sets. This article mainly focuses on coal-fired generator sets, so other generator sets will not be described in detail. The power generation system generally includes power plants, and each power plant contains a certain number of coal-fired generator sets.

[0050] The capacity cost-related data of coal-fired power generating units in the power generation system generally include the depreciation of fixed assets of coal-fired power generating units, the material costs of coal-fired power generating units, the repair costs of coal-fired power generating units, and the wages and welfare expenditures of employees of coal-fired power generating units.

[0051] The depreciation cost of fixed assets of coal-fired power generating units first needs to determine the original value of fixed assets. For coal-fired power generating units, the original value of fixed assets includes all expenses incurred in purchasing or building the generating units. Then, for the original value of fixed assets, a certain depreciation method is selected, and then the depreciation period and estimated net residual value are determined, and then the final depreciation cost of fixed assets is determined.

[0052] The material costs of coal-fired power generating units generally include fuel costs, equipment maintenance and repair material costs, and other material costs.

[0053] The repair costs of coal-fired power generating units generally include regular maintenance and repair costs and emergency repair costs for failures.

[0054] Step S102: determining the total capacity cost of the coal-fired power generation units in the power generation system based on the capacity cost related data;

[0055] After obtaining the capacity cost data of coal-fired power generating units in the power generation system, the total capacity cost of coal-fired power generating units in the power generation system is calculated using the following formula:

[0056] C fx =ΣC dep +ΣC mat +ΣC rep +∑C sal (1)

[0057] Where: C fx is the total capacity cost of coal-fired power generating units in the power generation system; C dep C is the fixed asset depreciation expense of coal-fired power generating units; mat C is the material cost of coal-fired power generating units; rep The repair cost of coal-fired power generating units; sal Wages and benefits for employees of coal-fired power generation units;

[0058] Calculating the total capacity cost of coal-fired power generation units in the power generation system is the basis for pricing strategy: the total capacity cost is also crucial for the power generation system to formulate a reasonable electricity price strategy. The electricity price should not only cover the variable costs, but also consider the allocation of fixed costs to ensure that the power generation system can recover its investment and obtain a reasonable profit.

[0059] Step S103: Based on the total capacity cost of the coal-fired power generating units in the power generation system; determine the time capacity electricity fee to be allocated to each power plant each month and the space capacity electricity fee to be allocated to each power plant each month;

[0060] After obtaining the total capacity cost of the coal-fired power generating units in the power generation system, the time capacity electricity charges that should be allocated to each power plant each month and the space capacity electricity charges that should be allocated to each power plant each month are calculated based on the total capacity cost.

[0061] First, how to calculate the time capacity electricity charges that should be allocated to each power plant each month is explained in detail:

[0062] Get the annual time series load curve of coal-fired power generation units in the power generation system, such as Figure 2 As shown in the figure, the annual time series load curve of coal-fired power generation units is a graph that describes the load changes of the power system over time within a year. It records in detail the load demand of coal-fired power generation units in different time periods (such as hourly, daily, weekly, monthly, etc.), which is very important for the operation and planning of the power system.

[0063] After obtaining the annual time-series load curve of the coal-fired power generating units in the power generation system, the time capacity electricity charges to be allocated to each power plant in the power generation system each month can be determined based on the annual time-series load curve and the total capacity cost.

[0064] Based on the annual time series load curve, the continuous load curve can be determined. Specifically, the annual time series load curve is divided into the following categories according to the load size: Figure 3 As shown, the peak time period P is arranged from high to low. max , normal period P i , valley period P i-1 , and then the continuous load curve is obtained, and the duration corresponding to each load level is clarified, and the total annual electricity consumption of the coal-fired power generating unit can be determined.

[0065] After obtaining the sustained load curve, the time capacity electricity charge to be allocated to each power plant each month can be determined based on the total capacity cost and the sustained load curve. As shown in the figure, on the sustained load curve, the total annual electricity consumption of coal-fired generators is horizontally divided to obtain the divided electricity blocks. Based on the divided electricity blocks and the total capacity cost, the following formulas (2), - (6) are used to calculate the unit capacity cost ΔD allocated to each unit of electricity at the same load level: i .

[0066]

[0067] ΔP i =P i -P i-1 (3)

[0068]

[0069] ΔQ i =ΔP i t i (5)

[0070]

[0071] Where: P i Indicates the load level at time i; ΔQ i Indicates the load level P i To P i-1 The amount of electricity between i Indicates the amount of electricity ΔQ i Capacity cost; ΔP i Indicates the load level P i To P i-1 The load difference between max Represents the maximum load of the system; Q i Indicates the load level as P i The total power of the vertical power block Q i,j Composition, 1≤j≤i; t i represents the i-th hour in a year, 1≤i≤8760h;

[0072] After the unit capacity cost is calculated, the capacity cost of each divided power block can be calculated based on the unit capacity cost using the following formula (7).

[0073] Power Block Q i,j Capacity cost C i,j for:

[0074]

[0075] Where ΔT is the duration of the load power.

[0076] After calculating the capacity cost that each power block needs to bear after the segmentation, the following formula (9) is used to calculate the capacity cost allocation value F corresponding to the load level of each power plant after the accumulation of each power block after the segmentation: i :

[0077]

[0078]

[0079] In the formula, C i The load level is P i The sum of the capacity costs shared by the electricity.

[0080] After calculating the accumulated and divided electricity blocks, the capacity cost allocation value F corresponding to the load level of each power plant i Then, the following formula (11) is used to calculate the capacity cost allocation value F corresponding to each load level. i and the load level R of each power plant i , determine the time capacity electricity charges that each power plant should share each month.

[0081] Z i =R i ·F i (11)

[0082] Where: Z i To take into account the time signal, each power plant should share the time capacity electricity fee every month.

[0083] After the above steps, the time capacity electricity charges that should be allocated to each power plant each month can be clearly calculated. The following is a detailed description of how to determine the capacity electricity charges that should be allocated to each power plant each month:

[0084] Obtain the utilization hour allocation coefficient of coal-fired power generation units in the power generation system every month. The utilization hour allocation coefficient of coal-fired power generation units every month is an important parameter used to measure and allocate power resources. It is usually determined based on the operating characteristics of the unit, power market demand, seasonal changes and other factors.

[0085] Before obtaining the utilization hour allocation coefficient of the coal-fired power generation unit of the power generation system each month, it is necessary to explain the generation of the utilization hour allocation coefficient of the coal-fired power generation unit of the power generation system each month:

[0086] Obtain the utilization hour data of coal-fired power units in each power plant. The utilization hour data refers to the average full-load operation time of coal-fired power units in a year. Specifically, it is the proportion of actual operation hours of coal-fired power units in the 8760 hours per year, also known as "equipment utilization rate".

[0087] After obtaining the utilization hour data of the coal-fired power generating units of each power plant, based on the utilization hour data of the coal-fired power generating units of each power plant, the following formulas (12)-(13) are used to determine the average utilization hours and total average utilization hours of the coal-fired power generating units of each power plant per month;

[0088]

[0089]

[0090] Where: i represents each power plant, j represents a month of each year, H i,j is the utilization hours of the i-th power plant in the j-th month; N is the total number of power plants; is the average utilization hours of coal-fired power generating units in each power plant in the jth month; is the total average utilization hours;

[0091] After calculating the average utilization hours of each coal-fired power generating unit in each power plant and the total average utilization hours per month, the following formula (14) is used to calculate and determine the utilization hour allocation coefficient K of the coal-fired power generating unit in the power generation system per month. j :

[0092]

[0093] After calculating and determining the utilization hour allocation coefficient of the coal-fired power generation unit in the power generation system each month, the utilization hour allocation coefficient of the coal-fired power generation unit in the power generation system each month and the total capacity cost C of the coal-fired power generation unit in the power generation system are determined based on the calculation. fx , use the following formula (15) to determine the monthly allocation base value x for each power plant:

[0094]

[0095] After determining the monthly allocation base value x of each power plant, it is necessary to obtain the monthly utilization hour coefficient K of each power plant. i,j and the monthly coefficient K of each power plant i .

[0096] Monthly utilization factor K of each power plant i,j and the monthly coefficient K of each power plant i The generation process is as follows:

[0097] Based on the average hours of coal-fired power generation units in each power plant per month Use the following formula (16) to determine the monthly utilization hour coefficient K of each power plant: i,j ;

[0098]

[0099] After determining the utilization hour coefficient K of each power plant every month i,j Then, the following formula (17) is used to determine the monthly coefficient K of each power plant. i ;

[0100]

[0101] In the above, the monthly allocation base value x of each power plant and the monthly utilization hour coefficient K of each power plant are determined. i,j, and the monthly coefficient K of each power plant i The following formula (18) is used to determine the space capacity electricity fee T that each power plant should share each month: i,j :

[0102] T i,j =K i,j ·K j ·x (18)

[0103] Where: T i,j is the capacity electricity price that the i-th power plant should share in the j-th month.

[0104] Through the above calculations, we can determine the time capacity electricity charges that each power plant should share each month and the space electricity charges that each power plant should share each month.

[0105] Step S104: Determine the coal-fired power capacity electricity price based on the time capacity electricity charges to be apportioned to each power plant each month and the space electricity charges to be apportioned to each power plant each month.

[0106] When determining the coal-fired power capacity electricity price, this paper needs to first obtain the time signal coefficient and the space signal coefficient. The time signal coefficient and the space signal coefficient here are obtained by weighted method by comprehensively considering factors such as the load level, duration, geographical location and node electricity price of the coal-fired power generating units in the power generation system.

[0107] After determining the time signal coefficient and the space signal coefficient, the following formula (19) is used to determine the coal-fired power capacity electricity price, which is the coal-fired power capacity shared electricity price that takes into account the time and space signals.

[0108] C final =α·Z i +β·T i,j (19)

[0109] Where: α is the time signal coefficient, β is the spatial signal coefficient, C final Amortizing electricity prices for coal-fired power capacity considering spatiotemporal signals.

[0110] The coal-fired power capacity price calculation method mentioned in this application reflects the supply and demand conditions at different times and spaces in the power system, can effectively guide the optimal allocation of power generation and power consumption resources, can optimize the operation of coal-fired power projects and even investment and reasonable power consumption of users through capacity electricity prices and their market price time and space signals, promote optimal resource allocation, improve the utilization rate of coal-fired power units and reduce user electricity prices, form an effective power supply guarantee mechanism, and effectively connect with the capacity compensation mechanism under the power spot market.

[0111] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for calculating the capacity price of coal-fired power, characterized in that: include: Obtain data related to the capacity cost of coal-fired power generation units in the power generation system; Determining the total capacity cost of the coal-fired power generation units of the power generation system based on the capacity cost related data; Based on the total capacity cost of coal-fired power generating units in the power generation system; Determine the time capacity electricity charges to be allocated to each power plant each month and the space capacity electricity charges to be allocated to each power plant each month; The coal-fired power capacity electricity price of each power plant each month is determined based on the time capacity electricity fee that each power plant should share each month and the space electricity fee that each power plant should share each month.

2. The method according to claim 1, characterized in that: The step of determining the time capacity electricity charges to be apportioned to each power plant in the power generation system in each month based on the power generation capacity cost-related data comprises: Obtain the annual time series load curve of coal-fired power generating units in the power generation system; Based on the total capacity cost and the annual time-series load curve, the time capacity electricity fee to be allocated to each power plant in the power generation system in each month is determined.

3. The method according to claim 2, characterized in that The determining of the time capacity electricity fee to be allocated to each power plant in each month based on the total capacity cost and the annual time series load curve includes: Based on the annual time series load curve, a continuous load curve is determined, wherein the continuous load curve is arranged from high to low according to the load size into a peak period, a normal period, and a valley period; Based on the continuous load curve and the total capacity cost, the time capacity electricity fee to be allocated to each power plant each month is determined.

4. The method according to claim 3, characterized in that The determining of the time capacity electricity fee to be shared by each power plant based on the continuous load curve and the total capacity cost includes: On the continuous load curve, the total annual electricity consumption of the coal-fired power generating unit is horizontally divided to obtain each divided electricity block; Based on the total capacity cost and the divided electricity blocks, determining the unit capacity cost allocated to each unit of electricity at the same load level; Based on the unit capacity cost, determine the capacity cost that each power block needs to bear after the segmentation; Based on the capacity cost required to be borne by each divided electricity block, determine the capacity cost sharing value corresponding to the load level of each power plant after accumulating each divided electricity block; Based on the capacity cost sharing value corresponding to each load level and the load level of each power plant, the time capacity electricity fee to be shared by each power plant in each month is determined.

5. The method according to any one of claims 1 to 4, characterized in that: Based on the total capacity cost of the coal-fired power generating units in the power generation system, determine the space capacity electricity charges that each power plant should share each month, including: Obtain the utilization hour allocation coefficient of the coal-fired power generation units in the power generation system each month; Based on the utilization hour allocation coefficient of each month and the total capacity cost of the coal-fired power generation units of the power generation system; determining the monthly allocation benchmark value of each power plant; Obtain the utilization hour coefficient of each power plant each month and the monthly coefficient of each power plant; Based on the monthly allocation base value of each power plant, the monthly utilization hour coefficient of each power plant, and the monthly coefficient of each power plant, the space capacity electricity fee that each power plant should share is determined.

6. The method according to claim 5, characterized in that The step of obtaining the utilization hour allocation coefficient of the coal-fired power generation unit of the power generation system each month includes: Obtain utilization hour data of coal-fired power units in each power plant; Based on the utilization hour data of the coal-fired power generating units of each power plant, determine the average utilization hours and the total average utilization hours of the coal-fired power generating units of each power plant in each month; Based on the average utilization hours and total utilization hours of the coal-fired power generating units of each power plant each month, the utilization hour allocation coefficient of the coal-fired power generating units of the power generation system each month is determined.

7. The method according to claim 6, characterized in that Before the step of obtaining the utilization hour coefficient of each power plant each month and the monthly coefficient of each power plant, the method further includes: Determine the utilization hour coefficient of each power plant per month based on the average hours of the coal-fired power generating units of each power plant per month; Based on the utilization hour coefficient of each power plant each month, a monthly coefficient of each power plant is determined.

8. The method according to claim 7, characterized in that The coal power capacity electricity price is determined based on the time capacity electricity fee that each power plant of the power generation system should share each month and the space electricity fee that each power plant should share each month, including: Obtaining time signal coefficients and space signal coefficients; The coal-fired power capacity electricity price is determined based on the time capacity electricity charges that each power plant should share each month and the time signal coefficient, and the space electricity charges that each power plant should share each month and the space signal coefficient.

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