Configuration optimization method for low-carbon power generation system of wind-solar-long-duration energy storage coupled with coal-fired power

Abstract

The present invention relates to a method for optimizing the configuration of a low-carbon power generation system of wind-solar-ultra-long-time energy storage coupled with coal-fired power, and belongs to the technical field of low-carbon comprehensive energy power generation. The method is designed according to the principle of maximizing the output of a thermal energy storage device and a green fuel energy storage device and minimizing the output of coal, and the power surplus is calculated according to the power demand. If there is a surplus of power, it is operated according to the above-mentioned operation strategy, otherwise, the output of the thermal energy storage device, the green fuel energy storage device and the coal is adjusted to form an operation mode with optimal carbon emissions; based on the operation strategy, the local natural resources throughout the year, the power load and the technical and economic parameters of each device, the configuration range of the installed capacity of each device and other parameters are input, the levelized kilowatt-hour cost and the load satisfaction rate are used as the objective function or constraint of each configuration scheme, and the carbon emission per kilowatt-hour that measures the environmental impact is introduced, and the configuration optimization is carried out based on different carbon emission reduction targets to obtain the optimal capacity configuration at different carbon emission reduction stages.

Description

Technical Field

[0001] The present invention belongs to the technical field of low-carbon integrated energy power generation, and in particular to a configuration optimization method for a low-carbon power generation system of wind-solar-long-term energy storage coupled with coal-fired power. Background Art

[0002] Coal-fired power is the main source of CO2 emissions in my country's energy utilization process. According to statistics, coal-fired power generation accounts for about 60% of my country's electricity supply and emits more than 40% of the country's CO2. In order to further clarify the clean and low-carbon transformation path of coal-fired power under the carbon neutrality goal, scholars at home and abroad have carried out research on the evaluation of clean and low-carbon technologies for coal-fired power. In recent years, the rapid development of technologies such as high-parameter large-capacity power generation, new cycle / working fluid high-efficiency power generation, carbon capture, utilization and storage (CCUS), low-carbon fuel blending, and coal graded conversion and utilization have provided several optional paths for coal-fired power carbon emission reduction. In addition, based on multi-energy complementary coupling technology, by improving the flexibility of existing coal-fired power units to promote the substantial consumption of renewable energy such as wind and solar, the CO2 emissions per kilowatt-hour of multi-energy coupling systems can also be further reduced. However, the technical evaluation of my country's multi-energy coupling low-carbon energy supply system still faces the following problems: the time granularity is relatively coarse, and the volatility of renewable energy and the dynamic flexibility of energy supply units are not considered in depth; for renewable energy, the spatial heterogeneity of resource endowment, the multi-scale characteristics in the time dimension, and the volatility and intermittency in operating output are not considered in depth; the existing configuration optimization methods of multi-energy coupling low-carbon energy supply systems are mostly based on the performance and efficiency parameters of existing technologies, and fail to fully consider the horizontal and vertical complementarity and coordination of energy systems. At the same time, the interactive relationship between technical evaluation indicators such as carbon emission reduction, economy, safety, and flexibility is still not clear enough.

[0003] Therefore, in response to the above challenges, the patent of this invention integrates multiple energy sources, multiple energy storage configurations, and multiple energy conversion methods to construct a multi-energy coupled low-carbon energy supply system with coordinated planning, collaborative management, interactive response, and mutual complementarity of cold-heat-electricity-gas multi-energy flows, and proposes energy supply system configuration optimization methods under different scenarios, which can effectively smooth out new energy fluctuations, reduce CO2 emissions, and improve the safety and flexibility of the energy supply system. Summary of the invention

[0004] The purpose of the present invention is to provide a low-carbon power generation system configuration optimization method of wind-solar-long-term energy storage coupled with coal-fired power, so as to solve the problem in the prior art that it is unable to provide guidance and suggestions on capacity configuration for achieving phased carbon emission reduction.

[0005] The present invention relates to a method for optimizing the configuration of a low-carbon power generation system of wind-solar-long-term energy storage coupled with coal-fired power. The system comprises a photovoltaic power generation device, a coal-fired power generation device, an electric energy storage device, a thermal energy storage device and a green fuel energy storage device. The thermal energy storage device and the green fuel energy storage device respectively provide thermal energy and green fuel to the coal-fired power generation device for power generation, and the method comprises the following steps:

[0006] S1. Formulate the operation strategy of the coal-green fuel-heat-light multi-energy coupling low-carbon power generation system, specifically:

[0007] S1.1. Calculate the output of the photovoltaic power generation device at a certain moment based on the natural resources and the configuration of the photovoltaic power generation device;

[0008] S1.2. Based on the configuration of the thermal energy storage device, the green fuel energy storage device and the coal-fired power generation device, the minimum output of the coal-fired power generation device is calculated according to the principle of maximizing the output of the thermal energy storage device and the green fuel energy storage device and minimizing the output of the coal-fired power generation device;

[0009] S1.3. Calculate the power surplus based on the output of the photovoltaic power generation device, the minimum output of the coal-fired power generation device and the power demand at that moment. If the power surplus is not less than 0, proceed to S1.4; otherwise, proceed to S1.5;

[0010] S1.4. The coal-fired power generation device operates at the minimum output calculated in S1.2, and the thermal energy storage device and the green fuel energy storage device are charged according to the surplus power. If there is still surplus power, the remaining surplus power is recorded as the amount of abandoned light at that moment;

[0011] S1.5. Indicate that there is a power shortage, and compensate for the power shortage in the order of first using the electric energy storage device and then using the coal-fired power generation device. Combine the coupling characteristics of the thermal energy storage device, the green fuel energy storage device, and the coal-fired power generation device to calculate the compensation output of each of the three. If there is still a power shortage after all the devices have compensated their output, the remaining power shortage will be recorded as the power shortage at that moment.

[0012] S2. Input local natural resources, power load and technical and economic parameters of each device throughout the year;

[0013] S3. Input the configuration interval of the installed capacity of each device to form a variety of configuration schemes;

[0014] S4. Combine the operation strategy formulated by S1, the data input by S2 and the various configuration schemes formed by S3 to obtain the annual abandoned light amount and the operating output status of each device at all times for various configuration schemes, and calculate the objective function or constraint of each configuration scheme accordingly, screen out the configuration scheme that meets the constraints, and obtain the single-objective optimal configuration scheme or the multi-objective optimal Pareto frontier through the optimization algorithm.

[0015] Preferably, by combining the equipment operation mechanism and empirical knowledge, the operation constraints of the multi-energy coupling system configuration optimization model are converted into an operation logic consisting of loop statements and branch statements;

[0016] Preferably, the calculation formula for calculating the output of the photovoltaic power generation device at a certain moment in S1.1 is:

[0017] P PV (t) = η PV ×Cap PV ×I T(t) ×[1-β(T c(t) -T cref(t) )] (1)

[0018] Among them, t represents time t, Cap PV represents the installed capacity of photovoltaic power generation, η PV Indicates the photoelectric conversion efficiency; T c Represents the temperature of the solar panel surface; T cref represents the ambient temperature; S represents the area of ​​the solar panel; I T It represents the actual solar irradiance received by the solar panel; β represents the temperature coefficient.

[0019] Preferably, the specific steps of calculating the minimum output of the coal-fired power generation device in S1.2 are:

[0020] S1.2.1. Calculate the minimum output P of the boiler in the coal-fired power generation unit CFPP,b,min (t), the calculation formula is:

[0021]

[0022] Among them, t represents time t, Cap CFPP represents the installed capacity of coal-fired power generation equipment, α boiler Indicates the minimum output ratio of the boiler, β boiler Indicates the boiler load change rate, P CFPP,b (t-1) represents the output of the boiler at the previous moment, η CFPP,supply Indicates the power supply efficiency of coal-fired power generation equipment;

[0023] The power supply efficiency η of the coal-fired power generation device CFPP,supply Calculated by the following formula:

[0024] η CFPP,supply =1-ξ self (3)

[0025] Among them, ξ self Indicates the amount of electricity consumed by oneself;

[0026] S1.2.2. Calculation of the maximum output P of green fuel in coal-fired power generation equipment CFPP,2,max (t), the calculation formula is:

[0027]

[0028] Among them, t represents time t, P CFPP,b,min (t) represents the minimum output of the boiler in the coal-fired power generation unit, γ co-fired Indicates the maximum blending ratio of green fuel, E AESS (t-1) represents the remaining energy of green fuel storage at the previous moment, η AESS,dch Indicates the discharge efficiency of green fuel energy storage;

[0029] The discharge efficiency of the green fuel energy storage is obtained by the following formula:

[0030] η AESS,dch =η CFPP,boiler ·η CFPP,turbine ·η CFPP,generator ·η CFPP,supply (5)

[0031] Among them, η CFPP,boiler represents the boiler power supply efficiency in coal-fired power generation equipment, η CFPP,turbine represents the power supply efficiency of the steam turbine in the coal-fired power generation device, η CFPP,supply Indicates the power supply efficiency of coal-fired power generation equipment;

[0032] S1.2.3. Calculate the minimum output P of the steam turbine in the coal-fired power generation device at time t CFPP,t,min The calculation formula of (t) is:

[0033]

[0034] Among them, Cap CFPP Cap represents the installed capacity of coal-fired power generation equipment. turbine,ex is the installed capacity of the additional steam turbine, α turbine is the minimum output ratio of the steam turbine, η CFPP,supply Represents the power supply efficiency of coal-fired power generation equipment, P CFPP,b,min (t) represents the minimum output of the boiler in the coal-fired power generation device at time t, P CFPP (t-1) represents the residual energy of the steam turbine at the previous moment, β turbine is the variable load rate of the steam turbine, η CFPP,supply Indicates the power supply efficiency of coal-fired power generation equipment;

[0035] S1.2.4. Calculate the maximum output P of thermal energy storage in coal-fired power generation equipment at time t CFPP,3,max (t), the calculation formula for the maximum output of thermal energy storage is:

[0036]

[0037] Among them, P CFPP,t,min (t) represents the minimum output of the steam turbine in the coal-fired power generation device at time t, P CFPP,b,min (t) represents the minimum output of the boiler in the coal-fired power generation device at time t, E TESS (t-1) represents the remaining energy of thermal energy storage at the previous moment, η TESS,dch represents the discharge efficiency of thermal energy storage,

[0038] The discharge efficiency η of the thermal energy storage TESS,dch The calculation formula is:

[0039] η TESS,dch =η CFPP,turbine ·η CFPP,generator ·η CFPP,supply (8)

[0040] Among them, η CFPP,turbine represents the power supply efficiency of the steam turbine, η CFPP,generator represents the generator power supply efficiency, η CFPP,supply Indicates the power supply efficiency of coal-fired power generation equipment;

[0041] S1.2.5. Calculation of the minimum output P of coal in coal-fired power generation equipment CFPP,1,min (t), the calculation formula is:

[0042]

[0043] Among them, P CFPP,t,min (t) represents the minimum output of the steam turbine in the coal-fired power generation device at time t, P CFPP,2,max (t) is the maximum output of green fuel in the coal-fired power generation device at time t, P CFPP,3,max (t) represents the maximum output of thermal energy storage in the coal-fired power generation device at time t, P CFPP,b,min (t) represents the minimum output of the boiler in the coal-fired power generation unit at time t;

[0044] S1.2.6. Calculation of the minimum output P of coal-fired power generation equipment CFPP,min (t), the calculation formula is:

[0045] P CFPP,min (t) = P CFPP,1,min (t)+P CFPP,2,max (t)+P CFPP,3,max (t)(10).

[0046] Preferably, the calculation formula for calculating the surplus power in S1.3 is:

[0047] P surplus =PPV (t)+P CFPP,min (t)-P demand (t)(11),

[0048] Among them, P surplus Indicates surplus power, P PV (t) represents the photovoltaic output at time t, P CFPP,min (t) represents the minimum output of the coal-fired power generation device at time t, P demand (t) represents the power demand value at time t.

[0049] Preferably, in S1.4, when the power surplus is not less than 0, the formulas for calculating the power shortage and abandoned light amount at that moment are:

[0050] P shortage (t) = 0(25),

[0051] P curtailment (t) = P surplus +P BESS,ch (t)+P TESS,ch (t)+P AESS,ch (t)(26),

[0052] Among them, P shortage (t) represents the power shortage at time t, P curtailment (t) represents the amount of abandoned light at time t, P surplus Indicates the surplus power, P BESS,ch (t) represents the charging power of the energy storage at time t, P TESS,ch (t) represents the charging power of the thermal energy storage at time t, P AESS,ch Represents the charging power of the green fuel energy storage at time t.

[0053] Preferably, in said S1.5, the specific steps of compensating the power shortage according to the compensation order of the electric energy storage device and the coal-fired power generation device and calculating the compensation output of the thermal energy storage device, the green fuel energy storage device and the coal include:

[0054] S1.5.1. Calculate the discharge power P of the electric energy storage device BESS,dch (t), the calculation formula is:

[0055]

[0056] Among them, P surplus Indicates the power surplus value, Cap BESS,dch Indicates the installed capacity of the discharge power of the electric energy storage, E BESS (t-1) represents the remaining energy of the electric energy storage at the previous moment, η BESS,dch Indicates the discharge efficiency of the electrical energy storage device;

[0057] S1.5.2. Calculate the maximum output P of coal-fired power generation equipment CFPP,max (t), the calculation formula is:

[0058]

[0059] Among them, P demand (t) represents the energy required at time t, P PV (t) represents the photovoltaic output at time t, P BESS,dch (t) represents the discharge power of the energy storage device at time t, P CFPP (t-1) represents the residual energy of the steam turbine at the previous moment, η CFPP,supply Cap represents the power supply efficiency of coal-fired power generation equipment. CFPP represents the installed capacity of coal-fired power generation equipment, β boiler Indicates the boiler load change rate, Cap turbine,ex is the installed capacity of the additional steam turbine, β turbine is the variable load rate of the steam turbine, η CFPP,supply Indicates the power supply efficiency of coal-fired power generation equipment;

[0060] S1.5.3. Calculate the output P to be compensated by thermal energy storage CFPP,3 (t), the calculation formula is:

[0061]

[0062] Among them, α boiler Indicates the minimum output ratio of the boiler;

[0063] S1.5.4. Calculate the output P that green fuel energy storage should compensate CFPP,2 (t), the calculation formula is:

[0064]

[0065] Among them, P CFPP,b,max (t) represents the maximum output of the boiler in the coal-fired power generation device, γ co-fired Indicates the maximum blending ratio of green fuel, E AESS (t-1) represents the remaining energy of green fuel storage at the previous moment, η AESS,dch represents the discharge efficiency of green fuel energy storage,

[0066] The calculation formula for the maximum output of the boiler in the coal-fired power generation device is:

[0067]

[0068] P CFPP,b (t-1) represents the output of the boiler at the previous moment;

[0069] S1.5.5. Calculate the output P that coal should compensate CFPP,1 (t), the calculation formula is:

[0070]

[0071] S1.5.6. Calculate the total output P of coal-fired power generation equipment CFPP (t), the calculation formula is:

[0072] P CFPP (t) = P CFPP,1 (t)+P CFPP,2 (t)+P CFPP,3 (t) (35).

[0073] Preferably, in S1.5, when the power surplus is less than 0, the formulas for calculating the power shortage and abandoned light amount at that moment are:

[0074] P shortage (t) = P demand (t)-P PV (t)-P BESS,dch (t)-P CFPP (t) (42),

[0075] P curtailment (t) = 0 (43),

[0076] Among them, P shortage (t) represents the power shortage at time t, P demand (t) represents the power demand at time t, P PV (t) represents the photovoltaic output of the photovoltaic cell at time t, P BESS,dch (t) represents the charging power of the electric energy storage, P CFPP (t) represents the total output of coal-fired power generation equipment, P curtailment (t) represents the amount of abandoned light at time t.

[0077] Preferably, in S4, the objective function includes the levelized cost per kilowatt-hour for measuring economic efficiency and the carbon emission per kilowatt-hour for measuring environmental impact, and the constraint includes the load satisfaction rate for measuring reliability;

[0078] The calculation formula of the levelized cost of electricity is:

[0079]

[0080] Among them, the subscript i represents different devices, I represents the initial investment cost, OM represents the annual fixed operation and maintenance cost, V represents the annual variable cost, N represents the equipment life, and r represents the discount rate;

[0081] The calculation formula for carbon emissions per kilowatt-hour is:

[0082]

[0083] Among them, m coal represents the annual coal consumption, θ coal represents the carbon emission factor of coal, t represents time, P demand represents the power demand, P shortage Indicates power shortage;

[0084] The annual coal consumption is m coal The calculation formula is:

[0085]

[0086] Among them, t represents time t, P CFPP,1 is the output of coal in a coal-fired power plant, η CFPP is the net power generation efficiency of the coal-fired power plant, q coal is the calorific value of coal;

[0087] The net power generation efficiency η of the coal-fired power plant is CFPP The calculation formula is:

[0088] η CFPP =η CFPP,boiler ·η CFPP,turbine ·η CFPP,generator ·η CFPP,supply (47),

[0089] Among them, η CFPP,boiler represents the boiler power supply efficiency in coal-fired power generation equipment, η CFPP,turbine represents the power supply efficiency of the steam turbine in the coal-fired power generation device, η CFPP,generator represents the generator power supply efficiency, η CFPP,supply Indicates the power supply efficiency of coal-fired power generation equipment;

[0090] The calculation formula of the load satisfaction rate is:

[0091]

[0092] Among them, Reliability represents the load satisfaction rate, P shortage (t) represents the power shortage at time t, P demand (t) represents the power demand value at time t.

[0093] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0094] The configuration optimization method of the multi-energy coupling low-carbon power generation and energy supply system involved in the present invention is first designed according to the principle of maximizing the output of the thermal energy storage device and the green fuel energy storage device and minimizing the output of coal when formulating the operation strategy, and then the power surplus is calculated according to the electricity demand. If there is a surplus of power, it is operated according to the above operation strategy. If there is no surplus power, the output of the thermal energy storage device, the green fuel energy storage device and the coal is adjusted, thereby forming an operation mode with the lowest carbon emissions. Based on this operation mode, the local natural resources throughout the year, the power load and the technical and economic parameters of each device, the configuration range of the installed capacity of each device and other parameters are input, and the levelized cost per kilowatt-hour for measuring economy and the load satisfaction rate for measuring reliability are used as the objective function or constraint of each configuration scheme, and the carbon emission per kilowatt-hour for measuring environmental impact is introduced. Configuration optimization is carried out based on different carbon emission reduction targets to obtain the optimal capacity configuration at different carbon emission reduction stages, and provide guidance and suggestions for capacity configuration to achieve phased carbon emission reduction.

[0095] Since there are many variables to be solved (the output status of different equipment such as coal-fired power, photovoltaic power, and energy storage for 8760 hours a year), the present invention combines the equipment operation mechanism and empirical knowledge to convert the operating constraints of the multi-energy coupling system configuration optimization model into an operation logic composed of loop statements and branch statements, which greatly reduces the solution time. The solution time is reduced from more than 72 hours to less than 1 hour. BRIEF DESCRIPTION OF THE DRAWINGS

[0096] Figure 1 This is a flow chart of the configuration optimization method for a low-carbon power generation system of wind-solar-long-term energy storage coupled with coal-fired power involved in the present invention.

[0097] Figure 2 This is an operation strategy diagram of an embodiment of a method for optimizing the configuration of a low-carbon power generation system of wind-solar-long-duration energy storage coupled with coal-fired power according to the present invention. DETAILED DESCRIPTION

[0098] The present invention is described in detail below, and the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0099] See attached Figure 1 As shown, the low-carbon power generation system configuration optimization method of wind-solar-long-term energy storage coupled with coal-fired power involved in the present invention comprises the following steps:

[0100] Step 1. Reference Figure 2 As shown in the figure, the operation strategy of the multi-energy coupling low-carbon energy supply system is formulated, specifically:

[0101] S1.1. Based on the natural resources and the configuration of the photovoltaic power generation device, the output of the photovoltaic power generation device at a certain moment is calculated. The calculation formula for calculating the output of the photovoltaic power generation device at a certain moment (time t) is:

[0102] P PV (t) = GHI(t)·Cap PV ·η PV (1)

[0103] Where t represents time t, GHI represents the global horizontal irradiance, Cap PV represents the installed capacity of photovoltaic power generation, η PV Indicates the power generation efficiency of photovoltaics;

[0104] S1.2. Based on the configuration of the thermal energy storage device, the green fuel energy storage device and the coal-fired power generation device, the minimum output of the coal-fired power generation device is calculated according to the principle of maximizing the output of the thermal energy storage device and the green fuel energy storage device and minimizing the output of coal. The specific steps are:

[0105] S1.2.1. Calculate the minimum output P of the boiler in the coal-fired power generation unit CFPP,b,min (t), the calculation formula is:

[0106]

[0107] Among them, t represents time t, Cap CFPP represents the installed capacity of coal-fired power generation equipment, α boiler Indicates the minimum output ratio of the boiler, β boiler Indicates the boiler load change rate, P CFPP,b (t-1) represents the output of the boiler at the previous moment, η CFPP,supply Indicates the power supply efficiency of coal-fired power generation equipment;

[0108] The power supply efficiency η of the coal-fired power generation device CFPP,supply Calculated by the following formula:

[0109] η CFPP,supply =1-ξ self (3)

[0110] Among them, ξ self Indicates the amount of electricity consumed by oneself;

[0111] S1.2.2. Calculation of the maximum output P of green fuel in coal-fired power generation equipment CFPP,2,max (t), the calculation formula is:

[0112]

[0113] Among them, t represents time t, P CFPP,b,min(t) represents the minimum output of the boiler in the coal-fired power generation unit, γ co-fired Indicates the maximum blending ratio of green fuel, E AESS (t-1) represents the remaining energy of green fuel storage at the previous moment, η AESS,dch Indicates the discharge efficiency of green fuel energy storage;

[0114] The discharge efficiency of the green fuel energy storage is obtained by the following formula:

[0115] η AESS,dch =η CFPP,boiler ·η CFPP,turbine ·η CFPP,generator ·η CFPP,supply (5)

[0116] Among them, η CFPP,boiler represents the boiler power supply efficiency in coal-fired power generation equipment, η CFPP,turbine represents the power supply efficiency of the steam turbine in the coal-fired power generation device, η CFPP,supply Indicates the power supply efficiency of coal-fired power generation equipment;

[0117] S1.2.3. Calculate the minimum output P of the steam turbine in the coal-fired power generation device at time t CFPP,t,min The calculation formula of (t) is:

[0118]

[0119] Among them, Cap CFPP Cap represents the installed capacity of coal-fired power generation equipment. turbine,ex is the installed capacity of the additional steam turbine, α turbine is the minimum output ratio of the steam turbine, η CFPP,supply Represents the power supply efficiency of coal-fired power generation equipment, P CFPP,b,min (t) represents the minimum output of the boiler in the coal-fired power generation device at time t, P CFPP (t-1) represents the residual energy of the steam turbine at the previous moment, β turbine is the variable load rate of the steam turbine, η CFPP,supply Indicates the power supply efficiency of coal-fired power generation equipment;

[0120] S1.2.4. Calculate the maximum output P of thermal energy storage in coal-fired power generation equipment at time t CFPP,3,max (t), the calculation formula for the maximum output of thermal energy storage is:

[0121]

[0122] Among them, P CFPP,t,min (t) represents the minimum output of the steam turbine in the coal-fired power generation device at time t, P CFPP,b,min (t) represents the minimum output of the boiler in the coal-fired power generation device at time t, ETESS (t-1) represents the remaining energy of thermal energy storage at the previous moment, η TESS,dch represents the discharge efficiency of thermal energy storage,

[0123] The discharge efficiency η of the thermal energy storage TESS,dch The calculation formula is:

[0124] η TESS,dch =η CFPP,turbine ·η CFPP,generator ·η CFPP,supply (8)

[0125] Among them, η CFPP,turbine represents the power supply efficiency of the steam turbine, η CFPP,generator represents the generator power supply efficiency, η CFPP,supply Indicates the power supply efficiency of coal-fired power generation equipment;

[0126] S1.2.5. Calculation of the minimum output P of coal in coal-fired power generation equipment CFPP,1,min (t), the calculation formula is:

[0127]

[0128] Among them, P CFPP,t,min (t) represents the minimum output of the steam turbine in the coal-fired power generation device at time t, P CFPP,2,max (t) is the maximum output of green fuel in the coal-fired power generation device at time t, P CFPP,3,max (t) represents the maximum output of thermal energy storage in the coal-fired power generation device at time t, P CFPP,b,min (t) represents the minimum output of the boiler in the coal-fired power generation unit at time t;

[0129] S1.2.6. Calculation of the minimum output P of coal-fired power generation equipment CFPP,min (t), the calculation formula is:

[0130] P CFPP,min (t) = P CFPP,1,min (t)+P CFPP,2,max (t)+P CFPP,3,max (t) (10).

[0131] S1.3. Calculate the power surplus based on the output of the photovoltaic power generation device, the minimum output of the coal-fired power generation device and the power demand at that time. The calculation formula for calculating the power surplus is:

[0132] P surplus =P PV (t)+P CFPP,min (t)-P demand (t) (11),

[0133] Among them, P surplusIndicates surplus power, P PV (t) represents the photovoltaic output at time t, P CFPP,min (t) represents the minimum output of the coal-fired power generation device at time t, P demand (t) represents the power demand value at time t,

[0134] If the power surplus is not less than 0, go to S1.4, otherwise, go to S1.5.

[0135] S1.4. The coal-fired power generation device operates according to the output of the thermal energy storage device, green fuel energy storage device and coal calculated in S1.2, and updates the remaining energy of the electrical energy storage, the remaining energy of the thermal energy storage and the remaining energy of the green fuel energy storage:

[0136] The output of green fuel, thermal energy storage, coal and total output in the coal-fired power generation device are expressed as:

[0137] P CFPP,1 (t) = P CFPP,1,min (t) (12),

[0138] P CFPP,2 (t) = P CFPP,2,max (t) (13),

[0139] P CFPP,3 (t) = P CFPP,3,max (t) (14),

[0140] P CFPP (t) = P CFPP,min (t) (15),

[0141] P CFPP,1 (t) represents the coal output in the coal-fired power generation device, P CFPP,2 (t) represents the output of green fuel in coal-fired power generation equipment, P CFPP,3 (t) represents the output of thermal energy storage in coal-fired power generation equipment, P CFPP (t) represents the total output of coal-fired power generation equipment;

[0142] The specific steps for updating the surplus energy of electrical energy storage, thermal energy storage and green fuel energy storage are:

[0143] (1) When there is surplus power, the discharge power P BESS,dch (t) is 0, the formula is:

[0144] P BESS,dch (t) = 0 (16);

[0145] (2) Determine the charging power P of the energy storage BESS,ch (t), the calculation formula is:

[0146]

[0147] Among them, Cap BESS,ch Indicates the charging power installed capacity of the electric energy storage, Cap BESS,ene Represents the installed energy capacity of electric energy storage, E BESS (t-1) represents the remaining energy of the electric energy storage at the previous moment, η BESS,ch Represents the charging efficiency of the electric energy storage, P surplus Indicates the surplus power; the meaning of this formula is that the charging power of the energy storage must meet the surplus power constraint, charging power constraint, and storage energy constraint;

[0148] (3) Update the remaining energy of the electric energy storage at time t, and the calculation formula is:

[0149]

[0150] Among them, η BESS,dch The discharge efficiency of the electrical energy storage; the thermal energy storage is based on the output of the coal-fired power generation device and the surplus power response;

[0151] (4) Updating the remaining energy of thermal energy storage, the specific steps are:

[0152] (4.1) Discharge power P of thermal energy storage TESS,dch (t) is the output of thermal energy storage in the coal-fired power generation device, expressed as:

[0153] P TESS,dch (t) = P CFPP,3 (t) (19),

[0154] (4.2) Calculate the charging power P of thermal energy storage TESS,ch (t), the calculation formula is:

[0155]

[0156] Among them, Cap TESS,ch is the charging power installed capacity of thermal energy storage, Cap TESS,ene is the installed capacity of thermal energy storage, η TESS,ch is the charging efficiency of thermal energy storage; the meaning of this formula is that the charging power of thermal energy storage must meet the power surplus constraint, charging power constraint, and storage energy constraint;

[0157] (4.3) Update the remaining energy E of thermal energy storage at time t TESS (t), the calculation formula is:

[0158]

[0159] Green fuel energy storage responds based on the output of coal-fired power generation units and the remaining surplus electricity.

[0160] (5) Updating the remaining energy of green fuel energy storage, the specific steps are:

[0161] (5.1) Discharge power P of green fuel energy storage AESS,dch (t) is the output of green fuel energy storage in coal-fired power generation equipment, expressed as:

[0162] P AESS,dch (t) = P CFPP,2 (t) (22);

[0163] (5.2) Calculate the charging power P of green fuel energy storage AESS,ch (t), the calculation formula is:

[0164]

[0165] Among them, Cap AESS,ch is the charging power installed capacity of green fuel energy storage, Cap AESS,ene is the installed energy capacity of green fuel energy storage, η AESS,ch is the charging efficiency of green fuel energy storage. The meaning of this formula is: the charging power of green fuel energy storage must meet the power surplus constraint, charging power constraint, and storage energy constraint;

[0166] (5.3) Update the remaining energy E of green fuel storage at time t AESS (t), the calculation formula is:

[0167]

[0168] Calculate the power shortage and abandoned light amount at this moment:

[0169] When the power surplus is not less than 0,

[0170] The power shortage P at time t shortage (t) is 0, that is:

[0171] P shortage (t) = 0 (25),

[0172] The amount of abandoned light at time t P curtailment (t) is calculated as:

[0173] P curtailment (t) = P surplus +P BESS,ch (t)+P TESS,ch (t)+P AESS,ch (t) (26),

[0174] Among them, P shortage (t) represents the power shortage at time t, P curtailment(t) represents the amount of abandoned light at time t, P surplus Indicates the surplus power, P BESS,ch (t) represents the charging power of the energy storage at time t, P TESS,ch (t) represents the charging power of the thermal energy storage at time t, P AESS,ch Represents the charging power of the green fuel energy storage at time t.

[0175] S1.5. Compensate for power shortages in the order of compensation of electric energy storage devices and coal-fired power generation devices, calculate the compensation output of thermal energy storage devices, green fuel energy storage devices and coal, and calculate the power shortage and abandoned solar power at that moment. The specific steps are as follows:

[0176] S1.5.1. Calculate the discharge power P of the electric energy storage device BESS,dch (t), the calculation formula is:

[0177]

[0178] Among them, P surplus Indicates the power surplus value, Cap BESS,dch Indicates the installed capacity of the discharge power of the electric energy storage, E BESS (t-1) represents the remaining energy of the energy storage at the previous moment, η BESS,dch Indicates the discharge efficiency of the electrical energy storage device;

[0179] The meaning of this formula is: the energy storage discharge power must meet the power shortage constraint, discharge power constraint, and storage energy constraint; at this time, the energy storage charging power P BESS,ch (t) is 0, which is expressed as:

[0180] P BESS,ch (t) = 0 (28);

[0181] Update the remaining energy E of the electric energy storage at time t BESS (t), the calculation formula is:

[0182]

[0183] The remaining energy shortfall is compensated by coal-fired power plants;

[0184] S1.5.2. Calculate the maximum output P of coal-fired power generation equipment CFPP,max (t), the calculation formula is:

[0185]

[0186] Among them, P demand (t) represents the energy required at time t, P PV (t) represents the photovoltaic output at time t, P BESS,dch(t) represents the discharge power of the energy storage device at time t, P CFPP (t-1) represents the residual energy of the steam turbine at the previous moment, η CFPP,supply Cap represents the power supply efficiency of coal-fired power generation equipment. CFPP represents the installed capacity of coal-fired power generation equipment, β boiler Indicates the boiler load change rate, Cap turbine,ex is the installed capacity of the additional steam turbine, β turbine is the variable load rate of the steam turbine, η CFPP,supply Indicates the power supply efficiency of coal-fired power generation equipment; the meaning of this formula is: the output of coal-fired power generation equipment must meet the power shortage constraint, boiler variable load constraint, turbine variable load constraint, and turbine maximum output constraint; coal-fired power generation equipment does not necessarily operate at maximum output, and further calculation is required in combination with other equipment;

[0187] S1.5.3. Calculate the output P to be compensated by thermal energy storage CFPP,3 (t), the calculation formula is:

[0188]

[0189] Among them, α boiler Indicates the minimum output ratio of the boiler;

[0190] The meaning of this formula is: the output of thermal energy storage must meet the boiler's minimum load constraint and thermal energy storage remaining energy constraint. After obtaining the thermal energy storage output, calculate the maximum output of the boiler P CFPP,b,max (t), the calculation formula is:

[0191]

[0192] The meaning of this formula is that the output of the boiler must meet the maximum output constraint of the coal-fired power generation device, the maximum output constraint of the boiler, and the variable load constraint of the boiler. It should be noted that the boiler does not necessarily operate at the maximum output, and further calculations must be combined with other equipment;

[0193] S1.5.4. Calculate the output P that green fuel energy storage should compensate CFPP,2 (t), the calculation formula is:

[0194]

[0195] Among them, P CFPP,b,max (t) represents the maximum output of the boiler in the coal-fired power generation device, γ co-fired Indicates the maximum blending ratio of green fuel, E AESS (t-1) represents the remaining energy of green fuel storage at the previous moment, η AESS,dchIt represents the discharge efficiency of green fuel energy storage. The meaning of this formula is: the output of green fuel energy storage must meet the maximum blending ratio constraint and the residual energy constraint;

[0196] S1.5.5. Calculate the output P that coal should compensate CFPP,1 (t), the calculation formula is:

[0197]

[0198] The meaning of this formula is: the output of coal must meet the maximum output constraint of the boiler;

[0199] S1.5.6. Calculate the total output P of coal-fired power generation equipment CFPP (t), the calculation formula is:

[0200] P CFPP (t) = P CFPP,1 (t)+P CFPP,2 (t)+P CFPP,3 (t) (35);

[0201] Charging power P of thermal energy storage at time t TESS,ch (t) is 0, the discharge power of thermal energy storage is P TESS,dch (t) is the output of thermal energy storage in coal-fired power generation equipment, which can be expressed as:

[0202] P TESS,ch (t) = 0 (36),

[0203] P TESS,dch (t) = P CFPP,3 (t) (37),

[0204] According to the charging and discharging power of the thermal energy storage, the remaining energy E of the thermal energy storage at time t is updated TESS (t), the calculation formula is:

[0205]

[0206] The specific steps to update the remaining energy of green fuel energy storage are:

[0207] Power shortage, green fuel energy storage charging power P at time t AESS,ch (t) is 0, the discharge power of green fuel energy storage is P TESS,dch (t) is the output of green fuel energy storage in coal-fired power generation equipment, which can be expressed as:

[0208] P AESS,ch (t) = 0 (39),

[0209] P AESS,dch (t) = P CFPP,2 (t) (40);

[0210] According to the charging and discharging power of the green fuel energy storage, update the remaining energy E of the green fuel energy storage at time t AESS (t), the calculation formula is:

[0211]

[0212] When the power surplus is less than 0, the formulas for calculating the power shortage and abandoned light at that moment are:

[0213] P shortage (t) = P demand (t)-P PV (t)-P BESS,dch (t)-P CFPP (t)(42),

[0214] P curtailment (t) = 0 (43),

[0215] Among them, P shortage (t) represents the power shortage at time t, P demand (t) represents the power demand at time t, P PV (t) represents the photovoltaic output of the photovoltaic cell at time t, P BESS,dch (t) represents the charging power of the electric energy storage, P CFPP (t) represents the total output of coal-fired power generation equipment, P curtailment (t) represents the amount of abandoned light at time t.

[0216] S2. Input local natural resources, power load and technical and economic parameters of each device throughout the year.

[0217] S3. Input the configuration range of the installed capacity of each device to form multiple configuration plans.

[0218] S4. Combine the operation strategy formulated by S1, the data input by S2 and the various configuration schemes formed by S3 to obtain the annual abandoned light amount and the operating output status of each device at all times for various configuration schemes, and calculate the objective function or constraint of each configuration scheme accordingly, select the configuration scheme that meets the constraint, and obtain the single-objective optimal configuration scheme or the multi-objective optimal Pareto frontier through the optimization algorithm;

[0219] Preferably, by combining the equipment operation mechanism and empirical knowledge, the operation constraints of the multi-energy coupling system configuration optimization model are converted into an operation logic consisting of loop statements and branch statements;

[0220] The above objective function includes the levelized cost of electricity to measure economic efficiency and the carbon emissions per kilowatt-hour to measure environmental impact. The constraints include the load satisfaction rate to measure reliability.

[0221] The calculation formula of the levelized cost of electricity is:

[0222]

[0223] Among them, the subscript i represents different devices, I represents the initial investment cost, OM represents the annual fixed operation and maintenance cost, V represents the annual variable cost, N represents the equipment life, and r represents the discount rate;

[0224] The calculation formula for carbon emissions per kilowatt-hour is:

[0225]

[0226] Among them, m coal represents the annual coal consumption, θ coal represents the carbon emission factor of coal, t represents time, P demand represents the power demand, P shortage Indicates power shortage;

[0227] The annual coal consumption is m coal The calculation formula is:

[0228]

[0229] Among them, t represents time t, P CFPP,1 is the output of coal in a coal-fired power plant, η CFPP is the net power generation efficiency of the coal-fired power plant, q coal is the calorific value of coal;

[0230] The net power generation efficiency η of the coal-fired power plant is CFPP The calculation formula is:

[0231] η CFPP =η CFPP,boiler ·η CFPP,turbine ·η CFPP,generator ·η CFPP,supply (47),

[0232] Among them, η CFPP,boiler represents the boiler power supply efficiency in coal-fired power generation equipment, η CFPP,turbine represents the power supply efficiency of the steam turbine in the coal-fired power generation device, η CFPP,generator represents the generator power supply efficiency, η CFPP,supply Indicates the power supply efficiency of coal-fired power generation equipment;

[0233] The calculation formula of the load satisfaction rate is:

[0234]

[0235] Among them, Reliability represents the load satisfaction rate, P shortage(t) represents the power shortage at time t, P demand (t) represents the power demand value at time t;

[0236] By adopting the configuration optimization method of the low-carbon power generation system of wind-solar-long-term energy storage coupled with coal-fired power of the present invention, the low-carbon power generation system of wind-solar-green fuel coupled with coal-fired power after optimization can achieve a minimum output load rate of coal-fired power as low as 15% of the rated load, and a load change rate of 4% to 5% of the rated load / minute. In the scenario of deep carbon emission reduction, the carbon emission per kilowatt-hour is equivalent to that of a gas turbine unit and can reach below 360g / kWh, and the pollutant emission level reaches the emission limit of the gas turbine.

[0237] The present invention is described in detail above in conjunction with the embodiments, but the contents described are only preferred embodiments of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A method for optimizing the configuration of a low-carbon power generation system of wind-solar-long-term energy storage coupled with coal-fired power, the system comprising a photovoltaic power generation device, a coal-fired power generation device, an electrical energy storage device, a thermal energy storage device and a green fuel energy storage device, the thermal energy storage device and the green fuel energy storage device respectively providing thermal energy and green fuel to the coal-fired power generation device for power generation, characterized in that: It includes the following steps: S1. Formulate the operation strategy of the low-carbon power generation system of wind-solar-green fuel coupled with coal power, specifically: S1.

1. Calculate the output of the photovoltaic power generation device at a certain moment based on natural resources and the configuration amount of the photovoltaic power generation device, wherein the natural resources include ambient temperature and solar irradiance; S1.

2. Based on the configuration of the thermal energy storage device, the green fuel energy storage device and the coal-fired power generation device, the minimum output of the coal-fired power generation device is calculated according to the principle of maximizing the output of the thermal energy storage device and the green fuel energy storage device and minimizing the output of the coal-fired power generation device; S1.

3. Calculate the power surplus based on the output of the photovoltaic power generation device, the minimum output of the coal-fired power generation device and the power demand at that moment. If the power surplus is not less than 0, proceed to S1.4; otherwise, proceed to S1.5; S1.

4. The coal-fired power generation device operates at the minimum output calculated in S1.2, and the thermal energy storage device and the green fuel energy storage device are charged according to the surplus power. If there is still surplus power, the remaining surplus power is recorded as the amount of abandoned light at that moment; S1.

5. Indicate that there is a power shortage, and compensate for the power shortage in the order of first using the electric energy storage device and then using the coal-fired power generation device. Combine the coupling characteristics of the thermal energy storage device, the green fuel energy storage device, and the coal-fired power generation device to calculate the compensation output of each of the three. If there is still a power shortage after all the devices have compensated their output, the remaining power shortage will be recorded as the power shortage at that moment. S2. Input local natural resources, power load and technical and economic parameters of each device throughout the year; S3. Input the configuration interval of the installed capacity of each device to form a variety of configuration schemes; S4. Combine the operation strategy formulated by S1, the data input by S2 and the various configuration schemes formed by S3 to obtain the annual abandoned light amount and the operating output status of each device at all times for various configuration schemes, and calculate the objective function or constraint of each configuration scheme accordingly, select the configuration scheme that meets the constraint, and obtain the single-objective optimal configuration scheme or the multi-objective optimal Pareto frontier through the optimization algorithm; The objective function includes the levelized cost of electricity to measure economic efficiency and the carbon emission per kilowatt-hour to measure environmental impact, and the constraints include the load satisfaction rate to measure reliability; The calculation formula of the levelized cost of electricity is: Among them, the subscript i represents different devices, I represents the initial investment cost, OM represents the annual fixed operation and maintenance cost, V represents the annual variable cost, N represents the equipment life, and r represents the discount rate; The calculation formula for carbon emissions per kilowatt-hour is: Among them, m coal represents the annual coal consumption, θ coal represents the carbon emission factor of coal, t represents time, P demand represents the power demand, P shortage Indicates power shortage; The annual coal consumption is m coal The calculation formula is: Among them, t represents time t, P CFPP,1 is the output of coal in a coal-fired power plant, η CFPP is the net power generation efficiency of the coal-fired power plant, q coal is the calorific value of coal; The net power generation efficiency η of the coal-fired power plant is CFPP The calculation formula is: or CFPP =the CFPP，boiler ·or CFPP，turbine ·or CFPP，generator ·or CFPP，supply (47), Among them, η CFPP,boiler represents the boiler power supply efficiency in coal-fired power generation equipment, η CFPP,turbine represents the power supply efficiency of the steam turbine in the coal-fired power generation device, η CFPP,generator represents the generator power supply efficiency, η CFPP,supply Indicates the power supply efficiency of coal-fired power generation equipment; The calculation formula of the load satisfaction rate is: Among them, Reliability represents the load satisfaction rate, P shortage (t) represents the power shortage at time t, P demand (t) represents the power demand value at time t.

2. The method for optimizing the configuration of a low-carbon power generation system of wind-solar-long-term energy storage coupled with coal-fired power according to claim 1 is characterized by: The calculation formula for calculating the output of the photovoltaic power generation device at a certain moment in S1.1 is: P PV (t)=η PV ×Cap PV ×I T(t) ×[1-β(T c(t) -T cref(t) )] (1), Among them, t represents time t, Cap PV represents the installed capacity of photovoltaic power generation, η PV Represents the photoelectric conversion efficiency, T c Represents the temperature of the solar panel surface, T cref represents the ambient temperature, I T It represents the actual solar irradiance received by the solar panel, and β represents the temperature coefficient.

3. The method for optimizing the configuration of a low-carbon power generation system of wind-solar-long-term energy storage coupled with coal-fired power according to claim 1 is characterized by: The specific steps for calculating the minimum output of the coal-fired power generation device in S1.2 are: S1.2.

1. Calculate the minimum output P of the boiler in the coal-fired power generation unit CFPP,b,min (t), the calculation formula is: Among them, t represents time t, Cap CFPP represents the installed capacity of coal-fired power generation equipment, α boiler Indicates the minimum output ratio of the boiler, β boiler Indicates the boiler load change rate, P CFPP,b (t-1) represents the output of the boiler at the previous moment, η CFPP,supply Indicates the power supply efficiency of coal-fired power generation equipment; The power supply efficiency η of the coal-fired power generation device CFPP,supply Calculated by the following formula: or CFPP，supply =1-ξ self (3), Among them, ξ self Indicates the amount of electricity consumed by oneself; S1.2.

2. Calculation of the maximum output P of green fuel in coal-fired power generation equipment CFPP,2,max (t), the calculation formula is: Among them, t represents time t, P CFPP,b,min (t) represents the minimum output of the boiler in the coal-fired power generation unit, γ co-fired Indicates the maximum blending ratio of green fuel, E AESS (t-1) represents the remaining energy of green fuel storage at the previous moment, η AESS,dch Indicates the discharge efficiency of green fuel energy storage; The discharge efficiency of the green fuel energy storage is obtained by the following formula: or AESS，dch =the CFPP，boiler ·or CFPP，turbine ·or CFPP，generator ·or CFPP，supply (5), Among them, η CFPP,boiler represents the boiler power supply efficiency in coal-fired power generation equipment, η CFPP,turbine represents the power supply efficiency of the steam turbine in the coal-fired power generation device, η CFPP,supply Indicates the power supply efficiency of coal-fired power generation equipment; S1.2.

3. Calculate the minimum output P of the steam turbine in the coal-fired power generation device at time t CFPP,t,min The calculation formula of (t) is: Among them, Cap CFPP Cap represents the installed capacity of coal-fired power generation equipment. turbine,ex is the installed capacity of the additional steam turbine, α turbine is the minimum output ratio of the steam turbine, η CFPP,supply Represents the power supply efficiency of coal-fired power generation equipment, P CFPP,b,min (t) represents the minimum output of the boiler in the coal-fired power generation device at time t, P CFPP (t-1) represents the residual energy of the steam turbine at the previous moment, β turbine is the variable load rate of the steam turbine, η CFPP,supply Indicates the power supply efficiency of coal-fired power generation equipment; S1.2.

4. Calculate the maximum output P of thermal energy storage in coal-fired power generation equipment at time t CFPP,3,max (t), the calculation formula for the maximum output of thermal energy storage is: Among them, P CFPP,t,min (t) represents the minimum output of the steam turbine in the coal-fired power generation device at time t, P CFPP,b,min (t) represents the minimum output of the boiler in the coal-fired power generation device at time t, E TESS (t-1) represents the remaining energy of thermal energy storage at the previous moment, η TESS,dch represents the discharge efficiency of thermal energy storage, The discharge efficiency η of the thermal energy storage TESS,dch The calculation formula is: or TESS，dch =the CFPP，turbine ·or CFPP，generator ·or CFPP，supply (8), Among them, η CFPP,turbine represents the power supply efficiency of the steam turbine, η CFPP,generator represents the generator power supply efficiency, η CFPP,supply Indicates the power supply efficiency of coal-fired power generation equipment; S1.2.

5. Calculation of the minimum output P of coal in coal-fired power generation equipment CFPP,1,min (t), the calculation formula is: Among them, P CFPP,t,min (t) represents the minimum output of the steam turbine in the coal-fired power generation device at time t, P CFPP,2,max (t) is the maximum output of green fuel in the coal-fired power generation device at time t, P CFPP,3,max (t) represents the maximum output of thermal energy storage in the coal-fired power generation device at time t, P CFPP,b,min (t) represents the minimum output of the boiler in the coal-fired power generation unit at time t; S1.2.

6. Calculation of the minimum output P of coal-fired power generation equipment CFPP,min (t), the calculation formula is: P CFPP,min (t)=P CFPP,1,min (t)+P CFPP,2,max (t)+P CFPP,3,max (t) (10)。 4. The method for optimizing the configuration of a low-carbon power generation system of wind-solar-long-term energy storage coupled with coal-fired power according to claim 1 is characterized in that: The calculation formula for calculating the surplus power in S1.3 is: P surplus =P PV (t)+P CFPP,min (t)-P demand (t) (11), Among them, P surplus Indicates surplus power, P PV (t) represents the photovoltaic output at time t, P CFPP,min (t) represents the minimum output of the coal-fired power generation device at time t, P demand (t) represents the power demand value at time t.

5. The method for optimizing the configuration of a low-carbon power generation system of wind-solar-long-term energy storage coupled with coal-fired power according to claim 1 is characterized by: In S1.4, when the power surplus is not less than 0, the formulas for calculating the power shortage and abandoned light amount at that moment are: P shortage (t)=0 (25), P curtailment (t)=P surplus +P BESS,ch (t)+P TESS,ch (t)+P AESS,ch (t) (26), Among them, P shortage (t) represents the power shortage at time t, P curtailment (t) represents the amount of abandoned light at time t, P surplus Indicates the surplus power, P BESS,ch (t) represents the charging power of the energy storage at time t, P TESS,ch (t) represents the charging power of the thermal energy storage at time t, P AESS,ch Represents the charging power of the green fuel energy storage at time t.

6. The method for optimizing the configuration of a low-carbon power generation system of wind-solar-long-term energy storage coupled with coal-fired power according to claim 1 is characterized by: In S1.5, the specific steps of compensating the power shortage according to the compensation order of the electric energy storage device and the coal-fired power generation device and calculating the compensation output of the thermal energy storage device, the green fuel energy storage device and the coal include: S1.5.

1. Calculating the discharge power P of the electric energy storage device BESS,dch (t), the calculation formula is: Among them, P surplus Indicates the power surplus value, Cap BESS,dch Indicates the installed capacity of the discharge power of the electric energy storage, E BESS (t-1) represents the remaining energy of the electric energy storage at the previous moment, η BESS,dch Indicates the discharge efficiency of the electrical energy storage device; S1.5.

2. Calculate the maximum output P of coal-fired power generation equipment CFPP,max (t), the calculation formula is: Among them, P demand (t) represents the energy required at time t, P PV (t) represents the photovoltaic output at time t, P BESS,dch (t) represents the discharge power of the energy storage device at time t, P CFPP (t-1) represents the residual energy of the steam turbine at the previous moment, η CFPP,supply Cap represents the power supply efficiency of coal-fired power generation equipment. CFPP represents the installed capacity of coal-fired power generation equipment, β boiler Indicates the boiler load change rate, Cap turbine,ex is the installed capacity of the additional steam turbine, β turbine is the variable load rate of the steam turbine, η CFPP,supply Indicates the power supply efficiency of coal-fired power generation equipment; S1.5.

3. Calculate the output P to be compensated by thermal energy storage CFPP,3 (t), the calculation formula is: Among them, α boiler Indicates the minimum output ratio of the boiler, E TESS (t-1) represents the remaining energy of thermal energy storage at the previous moment, η TESS,dch Indicates the discharge efficiency of thermal energy storage; S1.5.

4. Calculate the output P that green fuel energy storage should compensate CFPP,2 (t), the calculation formula is: Among them, P CFPP,b,max (t) represents the maximum output of the boiler in the coal-fired power generation device, γ co-fired Indicates the maximum blending ratio of green fuel, E AESS (t-1) represents the remaining energy of green fuel storage at the previous moment, η AESS,dch represents the discharge efficiency of green fuel energy storage, The calculation formula for the maximum output of the boiler in the coal-fired power generation device is: P CFPP,b (t-1) represents the output of the boiler at the previous moment; S1.5.

5. Calculate the output P that coal should compensate CFPP,1 (t), the calculation formula is: S1.5.

6. Calculate the total output P of coal-fired power generation equipment CFPP (t), the calculation formula is: P CFPP (t)=P CFPP,1 (t)+P CFPP,2 (t)+P CFPP,3 (t) (35)。 7. The method for optimizing the configuration of a low-carbon power generation system of wind-solar-long-term energy storage coupled with coal-fired power according to claim 6 is characterized by: In S1.5, when the power surplus is less than 0, the formulas for calculating the power shortage and abandoned light amount at that moment are: P shortage (t)=P demand (t)-P PV (t)-P BESS,dch (t)-P CFPP (t) (42), P curtailment (t)=0 (43), Among them, P shortage (t) represents the power shortage at time t, P demand (t) represents the power demand at time t, P PV (t) represents the photovoltaic output of the photovoltaic cell at time t, P BESS,dch (t) represents the charging power of the electric energy storage, P CFPP (t) represents the total output of coal-fired power generation equipment, P curtailment (t) represents the amount of abandoned light at time t.

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