Scheduling method and device for optical storage and charging integrated power station

Abstract

The invention provides an optical storage and charging integrated power station scheduling method and device, and belongs to the field of charging configuration. The method comprises the following steps: determining a discharging service fee and a charging service fee provided by an integrated power station in a target day for an electric vehicle, and a charging income obtained by an energy storage system for charging the electric vehicle in the target day; based on the charging income, the charging service charge, the discharging service charge and the power transmission on-grid electric quantity of the energy storage system, constructing a target function with the lowest operation cost of the energy storage system; constructing a constraint function based on the rated capacity of the energy storage system and the photovoltaic output curve of the integrated power station; and based on the target function and the constraint function, determining the time for switching the energy storage system from photovoltaic charging to power grid charging in the target day and the charging power for charging the energy storage system from the power grid. According to the invention, the operation cost of the light storage and charging integrated charging station can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of charging configuration, and in particular to a method and device for dispatching a photovoltaic storage and charging integrated power station. Background Art

[0002] The photovoltaic storage and charging integrated power station is a microgrid composed of three core parts: photovoltaic panel power generation, energy storage system and electric vehicle (EV) charging pile. Compared with traditional charging stations, this integrated power station has the advantages of environmental protection and carbon reduction, realizing the reuse of retired power batteries, and using energy storage systems to participate in peak load reduction and valley filling of the power grid. In recent years, it has gradually come into the public eye.

[0003] The integrated photovoltaic storage and charging power station has two operating modes: grid-connected and off-grid. In the grid-connected scenario, in addition to receiving energy from photovoltaic solar panels, the energy storage battery can also be charged when the electricity price is low and discharged when the electricity price is high, reducing the charging cost and gaining profits while being able to interact with the supply and demand of the power grid to achieve peak shaving and valley filling. In the off-grid scenario, the photovoltaic storage and charging system can use the off-grid operation mode to charge new energy vehicles in an emergency. The above process can effectively increase the proportion of clean energy in the energy consumed by electric vehicles, reduce indirect carbon emissions from electric vehicles, and promote the local consumption of renewable energy.

[0004] However, the current focus is on whether the configuration of photovoltaic storage capacity is reasonable, and the cost of photovoltaic power generation has not been considered. This makes it difficult to apply to engineering and commercial fields, making the promotion and application of integrated photovoltaic storage and charging stations difficult. Summary of the invention

[0005] The embodiments of the present invention provide a method and device for scheduling a photovoltaic storage and charging integrated power station to solve the problem of high operating costs of current charging stations.

[0006] In the first aspect, an embodiment of the present invention provides a scheduling method for a photovoltaic storage and charging integrated power station, in which photovoltaics only charge an energy storage system. When the photovoltaic power generation is lower than the rated capacity of the energy storage system, the energy storage system is charged from the power grid until the rated capacity is reached. The energy storage system works at a frequency of one discharge per day. The scheduling method includes:

[0007] Determine the discharge service fee and charging service fee provided by the integrated power station to electric vehicles on the target day, as well as the charging income obtained by the energy storage system from charging electric vehicles on the target day;

[0008] Based on charging revenue, charging service fees, discharging service fees and the amount of electricity sent to the grid by the energy storage system, an objective function is constructed to minimize the operating cost of the energy storage system.

[0009] Construct a constraint function based on the rated capacity of the energy storage system and the photovoltaic output curve of the integrated power station;

[0010] Based on the objective function and constraint function, the time for the energy storage system to switch from photovoltaic charging to grid charging within the target day and the charging power of the energy storage system from the grid are determined.

[0011] In one possible implementation, the revenue obtained by the energy storage system charging the electric vehicle within the target day is determined;

[0012] Based on the number of charging times, charging time, charging power provided by the integrated power station, and the charging service fee charged to the electric vehicle during each charging, determine the charging service fee obtained by the integrated power station when providing charging services to the electric vehicle within the target day;

[0013] Based on the number of discharges, discharge time, and discharge power provided by the integrated power station, as well as the discharge service fee charged to the electric vehicle for each discharge, the discharge service fee obtained by the integrated power station when providing discharge services to the electric vehicle within the target day is determined.

[0014] In one possible implementation, the charging revenue obtained by the energy storage system from charging electric vehicles within the target day is calculated as follows:

[0015]

[0016] Among them, F ESS2EV is the charging income obtained by the energy storage system from charging electric vehicles within the target d days of the integrated power station, P d,u,EV (t)dt is the charging power of the energy storage system charging the electric vehicle at the uth time t on the target day d, p d,u,EV (t) is the charging price charged by the energy storage system when it charges the electric vehicle at the uth time on the target day d, and U is the total number of times the energy storage system charges the electric vehicle on day d.

[0017] In a possible implementation, the charging service fee provided by the integrated power station to the electric vehicle within the target day is calculated as follows:

[0018]

[0019] Among them, F EV,c is the charging service fee obtained by the integrated power station for providing charging services to the energy storage system on target day d, K is the total number of charging services provided by the integrated power station on target day d, t d,k,s,c is the starting time of charging service for the kth time on target day d, t d,k,e,c is the charging service time for the kth charging at the end of the target day d, P d,k,c (t) is the charging power provided to the EV at time t during the k-th charging service on day d, p d,k,c (t) is the service fee charged to the electric vehicle at time t during the k-th charging service on day d.

[0020] In a possible implementation, the discharge service fee provided by the integrated power station to the electric vehicle within the target day is calculated as follows:

[0021]

[0022] Among them, F EV,dis is the service fee obtained by the integrated power station for providing discharge services to electric vehicles on target day d, J is the total number of discharge services provided by the integrated power station on target day d, and t d,j,s,dis The starting time of the discharge service for the jth time on the target day d, t d,j,e,dis The end time of the discharge service provided for the jth time on the target day d, P d,j,dis (t) is the power discharged from the electric vehicle to the grid at time t during the j-th electric vehicle grid discharge process on the target day d, p d,j,dis (t) is the service fee charged to the electric vehicle at time t during the j-th electric vehicle grid discharge on the target day d.

[0023] In one possible implementation, the objective function for minimizing the operating cost of the energy storage system is:

[0024]

[0025] F EV =F EV,c +F EV,dis ;

[0026] Among them, F ESS The revenue obtained by the energy storage system from charging electric vehicles and supplying electricity to the grid, F EV,c The charging service fee obtained by providing charging services to the energy storage system for the integrated power station on target day d, F EV,dis The service fee obtained by the integrated power station for providing discharge services to electric vehicles on target day d, E d,ESS2G,t The target amount of electricity delivered to the grid by the energy storage system at time t on day d; d,1 The time when the energy storage stops charging from photovoltaic power and switches to charging from the grid on the target day d; t d,2 The time when the valley or flat electricity price ends in the afternoon of the target day and turns to the peak electricity price; P d,G2ESS (t) is the target day d time t energy storage charging power from the grid, p d,G,t is the charging electricity price of the power station at time t on the target day.

[0027] In one possible implementation, the constraint function is:

[0028]

[0029] Among them, E ESS,Nis the rated capacity of the energy storage system, f d,PV (R t ,T t ,t) is the photovoltaic output curve of the integrated power station on the target day d.

[0030] In a possible implementation, the photovoltaic output curve f of the integrated power station on the target day d is d,PV (R t ,T t ,t) is:

[0031]

[0032] Among them, f S For photovoltaic panels under standard solar irradiance of 1000W / m 2 and the actual power at 25°C, η T is the power temperature coefficient of the photovoltaic cell, T d,t is the target temperature at time t on day d, R d,t is the surface solar irradiance at time t on the target day d.

[0033] In the second aspect, an embodiment of the present invention provides a scheduling device for a photovoltaic integrated power station, in which photovoltaics only charge the energy storage system. When the photovoltaic power generation is lower than the rated capacity of the energy storage system, the energy storage system is charged from the power grid until the rated capacity is reached. The energy storage system works at a frequency of one discharge per day. The scheduling device includes:

[0034] A fee determination module is used to determine the discharge service fee and charging service fee provided by the integrated power station to the electric vehicle within the target day, as well as the charging income obtained by the energy storage system from charging the electric vehicle within the target day;

[0035] A function building module is used to build an objective function for minimizing the operating cost of the energy storage system based on charging revenue, charging service fees, discharging service fees, and the amount of electricity sent to the grid by the energy storage system;

[0036] A constraint module is constructed to construct a constraint function based on the rated capacity of the energy storage system and the photovoltaic output curve of the integrated power station;

[0037] The solution module is used to determine the time when the energy storage system switches from photovoltaic charging to grid charging within the target day, and the charging power of the energy storage system from the grid based on the objective function and the constraint function.

[0038] In a possible implementation, a cost determination module is used to determine the revenue obtained by the energy storage system charging the electric vehicle within a target day based on the charging power, the number of charging times and the charging electricity price;

[0039] Based on the number of charging times, charging time, charging power provided by the integrated power station, and the charging service fee charged to the electric vehicle during each charging, determine the charging service fee obtained by the integrated power station when providing charging services to the electric vehicle within the target day;

[0040] Based on the number of discharges, discharge time, and discharge power provided by the integrated power station, as well as the discharge service fee charged to the electric vehicle for each discharge, the discharge service fee obtained by the integrated power station when providing discharge services to the electric vehicle within the target day is determined.

[0041] The embodiment of the present invention provides a method and device for scheduling an integrated photovoltaic power station with storage and charging. Based on the discharge service fee and charging service fee provided by the integrated power station to electric vehicles within the target day, and the charging income obtained by the energy storage system from charging electric vehicles within the target day, and combined with the amount of power sent to the grid by the energy storage system, an objective function for minimizing the operating cost of the energy storage system is constructed. A constraint function is constructed based on the rated capacity of the energy storage system and the photovoltaic output curve of the integrated power station. Finally, based on the objective function and the constraint function, the cost maximization of the energy storage system is achieved, and the time for the energy storage system to switch from photovoltaic charging to grid charging within the target day, as well as the charging power of the energy storage system from the grid are determined. Thereby, it helps to minimize the charging and discharging cost of the energy storage system and the cost of purchasing electricity from the grid, and helps to reduce the operating cost of the integrated photovoltaic power station with storage and charging. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 This is an application scenario diagram of the photovoltaic storage and charging integrated power station scheduling method provided by an embodiment of the present invention;

[0044] Figure 2 It is a flow chart for implementing the scheduling method of a photovoltaic storage and charging integrated power station provided by an embodiment of the present invention;

[0045] Figure 3 It is a structural schematic diagram of a photovoltaic storage and charging integrated power station dispatching device provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0046] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0047] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0048] As introduced in the background technology, with the continuous maturity of V2G related technologies, the profit scenarios of electric vehicle charging and discharging participating in vehicle-grid interaction are gradually enriched. V2G technology refers to the technology of electric vehicles supplying electricity to the power grid, that is, using the energy storage of a large number of electric vehicles as a buffer between the power grid and renewable energy. When the load on the power grid is too high, the electric vehicle energy storage feeds the power grid; and when the load on the power grid is low, it is used to store the excess power generation of the power grid to avoid waste. In this way, electric vehicle users can buy electricity from the power grid when the electricity price is low, and sell electricity to the power grid when the power grid price is high, thereby obtaining certain benefits. At present, most integrated photovoltaic storage and charging power stations mainly consider the installed capacity of energy storage, but do not start from the investment and operation perspective of integrated photovoltaic storage and charging power stations. Since the photovoltaic power generation period is generally the flat or valley period of the power grid load, the power grid electricity price is lower during this period, and the profit of photovoltaic power generation directly connected to the grid or sold to electric vehicle users is less.

[0049] From the perspective of investment and operation of integrated photovoltaic, storage and charging power stations, the present invention sets the energy storage system to operate at a frequency of one charge and one discharge per day. Photovoltaic power generation is not directly connected to the grid, but all is used to charge the energy storage system. If the photovoltaic power generation does not reach the rated capacity of the energy storage system, the energy storage system will be charged from the grid during the valley or flat electricity price period of the grid until the rated capacity is reached; during the peak or peak electricity price period of the grid, the energy storage will be discharged to the electric vehicle through the charging pile first. After the charging demand of the electric vehicle is met, the remaining electricity will be sold to the grid to earn the difference.

[0050] Figure 1 The application scenario diagram provided in the embodiment of the present invention shows that the integrated photovoltaic storage and charging power station includes a power grid, a photovoltaic system, an energy storage system, a charging pile and an electric vehicle.

[0051] Figure 2 The implementation flow chart of the photovoltaic storage and charging integrated power station scheduling method provided by the embodiment of the present invention is detailed as follows:

[0052] S210. Determine the discharge service fee and charging service fee provided by the integrated power station to the electric vehicle within the target day, as well as the charging income obtained by the energy storage system from charging the electric vehicle within the target day.

[0053] In some embodiments, first, based on the charging power, the number of charging times and the charging electricity price, the revenue obtained by the energy storage system from charging the electric vehicle within the target day can be determined.

[0054] Then, based on the number of charging times, charging time, charging power provided by the integrated power station, and the charging service fee charged to the electric vehicle for each charging, the charging service fee obtained by the integrated power station when providing charging services to the electric vehicle within the target day is determined.

[0055] Finally, based on the number of discharges, discharge time, and discharge power provided by the integrated power station, as well as the discharge service fee charged to the electric vehicle for each discharge, the discharge service fee obtained by the integrated power station when providing discharge services to the electric vehicle within the target day is determined.

[0056] In this embodiment, the charging revenue obtained by the energy storage system from charging the electric vehicle within the target day is calculated as follows:

[0057]

[0058] Among them, F ESS2EV is the charging income obtained by the energy storage system from charging electric vehicles within the target d days of the integrated power station, P d,u,EV (t)dt is the charging power of the energy storage system charging the electric vehicle at the uth time t on the target day d, p d,u,EV (t) is the charging price charged by the energy storage system when charging the electric vehicle at the uth time t on the target day d, and U is the total number of times the energy storage system charges the electric vehicle on day d. It should be noted that the number of times the energy storage system charges the electric vehicle here refers to the number of times a single charging pile charges a single electric vehicle, and each discharge order is counted as 1 time.

[0059] In this embodiment, the charging service fee provided by the integrated power station to the electric vehicle within the target day is calculated as follows:

[0060]

[0061] Among them, F EV,c is the charging service fee obtained by the integrated power station for providing charging services to the energy storage system on target day d, K is the total number of charging services provided by the integrated power station on target day d, t d,k,s,c is the starting time of charging service for the kth time on target day d, t d,k,e,c is the charging service time for the kth charging at the end of the target day d, P d,k,c (t) is the charging power provided to the EV at time t during the k-th charging service on day d, p d,k,c(t) is the service fee charged to the electric vehicle at time t during the k-th charging service provided on day d. It should be noted that the number of charging services provided by the integrated power station on day d here refers to the charging service provided by a single charging pile to a single EV, and each charging order is counted as 1 time.

[0062] In this embodiment, the calculation method of the discharge service fee provided by the integrated power station to the electric vehicle within the target day is:

[0063]

[0064] Among them, F EV,dis is the service fee obtained by the integrated power station for providing discharge services to electric vehicles on target day d, J is the total number of discharge services provided by the integrated power station on target day d, and t d,j,s,dis The starting time of the discharge service for the jth time on the target day d, t d,j,e,dis The end time of the discharge service provided for the jth time on the target day d, P d,j,dis (t) is the power discharged from the electric vehicle to the grid at time t during the j-th electric vehicle grid discharge process on the target day d, p d,j,dis (t) is the service fee charged to the electric vehicle at time t during the jth electric vehicle grid discharge on target day d. It should be noted that the number of discharge services provided by the integrated power station on target day d here refers to the discharge service provided by a single charging pile to a single EV, and each discharge order is counted as 1 time.

[0065] S220: Based on the charging income, charging service fee, discharging service fee and the amount of power sent to the grid by the energy storage system, an objective function for minimizing the operating cost of the energy storage system is constructed.

[0066] After determining the charging revenue, charging service fee and discharging service fee, the operating cost model of the energy storage system charging station can be constructed.

[0067] Based on the charging service fee obtained by the integrated power station for providing charging services to the energy storage system on target day d and the service fee obtained by the integrated power station for providing discharging services to the electric vehicle on target day d, the service fee obtained by the integrated power station when providing charging and discharging services to the EV can be determined.

[0068] F EV =F EV,c +F EV,dis ;

[0069] Among them, F EV The service fee obtained when the integrated power station provides charging and discharging services to EVs, F EV,c The charging service fee obtained by providing charging services to the energy storage system for the integrated power station on target day d, F EV,disThe service fee obtained by the integrated power station from providing discharge services to electric vehicles on the target day d.

[0070] In some embodiments, the objective function for minimizing the operating cost of the energy storage system is M ax (F ESS ):

[0071]

[0072] F EV =F EV,c +F EV,dis ;

[0073] Among them, F ESS The revenue obtained by the energy storage system from charging electric vehicles and supplying electricity to the grid, F EV,c The charging service fee obtained by providing charging services to the energy storage system for the integrated power station on target day d, F EV,dis The service fee obtained by the integrated power station for providing discharge services to electric vehicles on target day d, E d,ESS2G,t The target amount of electricity delivered to the grid by the energy storage system at time t on day d; d,1 The time when the energy storage stops charging from photovoltaic power and switches to charging from the grid on the target day d; t d,2 The time when the valley or flat electricity price ends in the afternoon of the target day and turns to the peak electricity price; P d,G2ESS (t) is the target day d time t energy storage charging power from the grid, p d,C,t is the charging electricity price of the power station at time t on the target day.

[0074] S230: Construct a constraint function based on the rated capacity of the energy storage system and the photovoltaic output curve of the integrated power station.

[0075] The charging time of the energy storage system and whether it needs to be charged from the grid are limited by the rated capacity of the energy storage system and the photovoltaic output curve. Therefore, a constraint function is constructed based on the rated capacity of the energy storage system and the photovoltaic output curve of the integrated power station.

[0076] In some embodiments, the constraint function is:

[0077]

[0078] Among them, E ESN,N is the rated capacity of the energy storage system, f d,PV (R t ,T t ,t) is the photovoltaic output curve of the integrated power station on the target day d.

[0079] In this embodiment, the photovoltaic output curve f of the integrated power station on the target day d is d,PV (R t ,Tt ,t) is:

[0080]

[0081] Among them, f S For photovoltaic panels under standard solar irradiance of 1000W / m 2 and the actual power at 25°C, η T is the power temperature coefficient of the photovoltaic cell, T d,t is the target temperature at time t on day d, R d,t is the surface solar irradiance at time t on the target day d.

[0082] S240: Based on the objective function and the constraint function, determine the time for the energy storage system to switch from photovoltaic charging to grid charging within the target day, and the charging power of the energy storage system from the grid.

[0083] After determining the objective function and constraint function, the objective function can be solved to determine the time t when the energy storage system stops charging the photovoltaic power plant from the grid within the target day. d,1 , and the charging power P of the energy storage system charged from the grid d,G2ESS (t).

[0084] The method for scheduling an integrated photovoltaic power station with storage and charging provided in an embodiment of the present invention constructs an objective function for minimizing the operating cost of the energy storage system based on the discharge service fee and charging service fee provided by the integrated power station to electric vehicles within the determined target day, and the charging income obtained by the energy storage system from charging electric vehicles within the target day, and combined with the amount of power sent to the grid by the energy storage system. A constraint function is constructed based on the rated capacity of the energy storage system and the photovoltaic output curve of the integrated power station. Finally, based on the objective function and the constraint function, the cost maximization of the energy storage system is achieved, and the time for the energy storage system to switch from photovoltaic charging to grid charging within the target day, as well as the charging power of the energy storage system from the grid are determined. Thereby, it helps to minimize the charging and discharging cost of the energy storage system and the cost of purchasing electricity from the grid, and helps to reduce the operating cost of the integrated photovoltaic power station with storage and charging.

[0085] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0086] The following is an embodiment of the device of the present invention. For details not described in detail, reference may be made to the corresponding method embodiments described above.

[0087] Figure 3The schematic diagram of the structure of the photovoltaic storage and charging integrated power station dispatching device provided by the embodiment of the present invention is shown. For the convenience of explanation, only the part related to the embodiment of the present invention is shown, which is described in detail as follows:

[0088] like Figure 3 As shown, in the integrated photovoltaic storage and charging power station dispatching device 300, photovoltaic only charges the energy storage system. When the photovoltaic power generation is lower than the rated capacity of the energy storage system, the energy storage system is charged from the grid until the rated capacity is reached. The energy storage system works at a frequency of one discharge per day. The dispatching device includes:

[0089] The fee determination module 310 is used to determine the discharge service fee and charging service fee provided by the integrated power station to the electric vehicle within the target day, as well as the charging income obtained by the energy storage system from charging the electric vehicle within the target day;

[0090] A function building module 320 is used to build an objective function for minimizing the operating cost of the energy storage system based on the charging income, the charging service fee, the discharging service fee, and the amount of electricity sent to the grid by the energy storage system;

[0091] A constraint building module 330 is used to build a constraint function based on the rated capacity of the energy storage system and the photovoltaic output curve of the integrated power station;

[0092] The solution module 340 is used to determine the time when the energy storage system switches from photovoltaic charging to grid charging within the target day, and the charging power of the energy storage system from the grid based on the objective function and the constraint function.

[0093] In a possible implementation, the cost determination module 310 is used to determine the revenue obtained by the energy storage system charging the electric vehicle within the target day based on the charging power, the number of charging times and the charging electricity price;

[0094] Based on the number of charging times, charging time, charging power provided by the integrated power station, and the charging service fee charged to the electric vehicle during each charging, determine the charging service fee obtained by the integrated power station when providing charging services to the electric vehicle within the target day;

[0095] Based on the number of discharges, discharge time, and discharge power provided by the integrated power station, as well as the discharge service fee charged to the electric vehicle for each discharge, the discharge service fee obtained by the integrated power station when providing discharge services to the electric vehicle within the target day is determined.

[0096] In one possible implementation, the charging revenue obtained by the energy storage system from charging electric vehicles within the target day is calculated as follows:

[0097]

[0098] Among them, F ESS2EVis the charging income obtained by the energy storage system from charging electric vehicles within the target d days of the integrated power station, P d,u,EV (t)dt is the charging power of the energy storage system charging the electric vehicle at the uth time t on the target day d, p d,u,EV (t) is the charging price charged by the energy storage system when it charges the electric vehicle at the uth time on the target day d, and U is the total number of times the energy storage system charges the electric vehicle on day d.

[0099] In a possible implementation, the charging service fee provided by the integrated power station to the electric vehicle within the target day is calculated as follows:

[0100]

[0101] Among them, F EV,c is the charging service fee obtained by the integrated power station for providing charging services to the energy storage system on target day d, K is the total number of charging services provided by the integrated power station on target day d, t d,k,s,c is the starting time of charging service for the kth time on target day d, t d,k,e,c is the charging service time for the kth charging at the end of the target day d, P d,k,c (t) is the charging power provided to the EV at time t during the k-th charging service on day d, p d,k,c (t) is the service fee charged to the electric vehicle at time t during the k-th charging service on day d.

[0102] In a possible implementation, the discharge service fee provided by the integrated power station to the electric vehicle within the target day is calculated as follows:

[0103]

[0104] Among them, F EV,dis is the service fee obtained by the integrated power station for providing discharge services to electric vehicles on target day d, J is the total number of discharge services provided by the integrated power station on target day d, and t d,j,s,dis The starting time of the discharge service for the jth time on the target day d, t d,j,e,dis The end time of the discharge service provided for the jth time on the target day d, P d,j,dis (t) is the power discharged from the electric vehicle to the grid at time t during the j-th electric vehicle grid discharge process on the target day d, p d,j,dis (t) is the service fee charged to the electric vehicle at time t during the j-th electric vehicle grid discharge on the target day d.

[0105] In one possible implementation, the objective function for minimizing the operating cost of the energy storage system is:

[0106]

[0107] FEV =F EV,c +F EV,dis ;

[0108] Among them, F ESS The revenue obtained by the energy storage system from charging electric vehicles and supplying electricity to the grid, F EV,c The charging service fee obtained by providing charging services to the energy storage system for the integrated power station on target day d, F EV,dis The service fee obtained by the integrated power station for providing discharge services to electric vehicles on target day d, E d,ESS2G,t The target amount of electricity delivered to the grid by the energy storage system at time t on day d; d,1 The time when the energy storage stops charging from photovoltaic power and switches to charging from the grid on the target day d; t d,2 The time when the valley or flat electricity price ends in the afternoon of the target day and turns to the peak electricity price; P d,G2ESS (t) is the target day d time t energy storage charging power from the grid, p d,G,t is the charging electricity price of the power station at time t on the target day.

[0109] In one possible implementation, the constraint function is:

[0110]

[0111] Among them, E ESS,N is the rated capacity of the energy storage system, f d,PV (R t ,T t ,t) is the photovoltaic output curve of the integrated power station on the target day d.

[0112] In a possible implementation, the photovoltaic output curve f of the integrated power station on the target day d is d,PV (R t ,T t ,t) is:

[0113]

[0114] Among them, f S For photovoltaic panels under standard solar irradiance of 1000W / m 2 and the actual power at 25°C, η T is the power temperature coefficient of the photovoltaic cell, T d,t is the target temperature at time t on day d, R d,t is the surface solar irradiance at time t on the target day d.

[0115] The photovoltaic storage and charging integrated power station dispatching device provided in the embodiment of the present invention constructs an objective function for minimizing the operating cost of the energy storage system based on the discharge service fee and charging service fee provided by the integrated power station to the electric vehicle within the determined target day, and the charging income obtained by the energy storage system from charging the electric vehicle within the target day, and combined with the amount of power sent to the grid by the energy storage system. A constraint function is constructed based on the rated capacity of the energy storage system and the photovoltaic output curve of the integrated power station. Finally, based on the objective function and the constraint function, the cost maximization of the energy storage system is achieved, and the time for the energy storage system to switch from photovoltaic charging to grid charging within the target day, as well as the charging power of the energy storage system from the grid are determined. Thereby, it helps to minimize the charging and discharging cost of the energy storage system and the cost of purchasing electricity from the grid, and helps to reduce the operating cost of the photovoltaic storage and charging integrated charging station.

[0116] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0117] Those of ordinary skill in the art will appreciate that the templates, units, and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0118] If the module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, it can implement the steps of the above-mentioned embodiments of the integrated photovoltaic storage and charging power station scheduling method. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier signal, telecommunication signal and software distribution medium.

[0119] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A method for dispatching a photovoltaic storage and charging integrated power station, characterized in that: Photovoltaic only charges the energy storage system. When the photovoltaic power generation is lower than the rated capacity of the energy storage system, the energy storage system is charged from the grid until the rated capacity is reached. The energy storage system works at a frequency of one discharge per day. The scheduling method includes: Determine the discharge service fee and charging service fee provided by the integrated power station to electric vehicles on the target day, as well as the charging income obtained by the energy storage system from charging electric vehicles on the target day; Based on the charging income, charging service fee, discharging service fee and the amount of electricity sent to the grid by the energy storage system, construct an objective function for minimizing the operating cost of the energy storage system; Construct a constraint function based on the rated capacity of the energy storage system and the photovoltaic output curve of the integrated power station; Based on the objective function and the constraint function, the time for the energy storage system to switch from photovoltaic charging to grid charging within the target day and the charging power of the energy storage system from the grid are determined.

2. The method for dispatching a photovoltaic storage and charging integrated power station according to claim 1, characterized in that: The determination of the discharge service fee and charging service fee provided by the integrated power station to the electric vehicle within the target day, as well as the charging income obtained by the energy storage system from charging the electric vehicle within the target day, includes: Based on the charging power, charging times and charging electricity price, determine the revenue that the energy storage system can obtain from charging electric vehicles within the target day; Based on the number of charging times, charging time, and charging power provided by the integrated power station, as well as the charging service fee charged to the electric vehicle during each charging, determine the charging service fee that the integrated power station obtains when providing charging services to the electric vehicle within the target day; Based on the number of discharges, discharge time, and discharge power provided by the integrated power station, as well as the discharge service fee charged to the electric vehicle for each discharge, the discharge service fee obtained by the integrated power station when providing discharge services to the electric vehicle within the target day is determined.

3. The method for dispatching a photovoltaic storage and charging integrated power station according to claim 1 or 2, characterized in that: The calculation method of the charging income obtained by the energy storage system charging electric vehicles within the target day is: Among them, F ESS2EV is the charging income obtained by the energy storage system from charging electric vehicles within the target d days of the integrated power station, P d,u,EV (t)dt is the charging power of the energy storage system charging the electric vehicle at the uth time t on the target day d, p d,u,EV (t) is the charging price charged by the energy storage system when it charges the electric vehicle at the uth time on the target day d, and U is the total number of times the energy storage system charges the electric vehicle on day d.

4. The method for dispatching a photovoltaic storage and charging integrated power station according to claim 1 or 2, characterized in that: The calculation method of the charging service fee provided by the integrated power station to electric vehicles within the target day is as follows: Among them, F EV,c is the charging service fee obtained by the integrated power station for providing charging services to the energy storage system on target day d, K is the total number of charging services provided by the integrated power station on target day d, t d,k,s,c is the starting time of charging service for the kth time on target day d, t d,k,e,c is the charging service time for the kth charging at the end of the target day d, P d,k,c (t) is the charging power provided to the EV at time t during the k-th charging service on day d, p d,k,c (t) is the service fee charged to the electric vehicle at time t during the k-th charging service on day d.

5. The method for dispatching a photovoltaic storage and charging integrated power station according to claim 1 or 2, characterized in that: The calculation method of the discharge service fee provided by the integrated power station to the electric vehicle within the target day is: Among them, F EV,dis is the service fee obtained by the integrated power station for providing discharge services to electric vehicles on target day d, J is the total number of discharge services provided by the integrated power station on target day d, and t d,j,s,dis The starting time of the discharge service for the jth time on the target day d, t d,j,e,dis The end time of the discharge service provided for the jth time on the target day d, P d,j,dis (t) is the power discharged from the electric vehicle to the grid at time t during the j-th electric vehicle grid discharge process on the target day d, p d,j,dis (t) is the service fee charged to the electric vehicle at time t during the j-th electric vehicle grid discharge on the target day d.

6. The method for dispatching a photovoltaic storage and charging integrated power station according to claim 1, characterized in that: The objective function for minimizing the operating cost of the energy storage system is: F EV =F EV,c +F EV,dis ; Among them, F ESS The revenue obtained by the energy storage system from charging electric vehicles and supplying electricity to the grid, F EV,c The charging service fee obtained by providing charging services to the energy storage system for the integrated power station on target day d, F EV,dis The service fee obtained by the integrated power station for providing discharge services to electric vehicles on target day d, E d,ESS2G,t The target amount of electricity delivered to the grid by the energy storage system at time t on day d; d,1 The time when the energy storage stops charging from photovoltaic power and switches to charging from the grid on the target day d; t d,2 The time when the valley or flat electricity price ends in the afternoon of the target day and turns to the peak electricity price; P d,G2ESS (t) is the target day d time t energy storage charging power from the grid, p d,G,t is the charging electricity price of the power station at time t on the target day.

7. The method for dispatching a photovoltaic storage and charging integrated power station according to claim 1, characterized in that: The constraint function is: Among them, E ESS,N is the rated capacity of the energy storage system, f d,PV (R t ,T t ,t) is the photovoltaic output curve of the integrated power station on the target day d.

8. The method for dispatching a photovoltaic storage and charging integrated power station according to claim 7, characterized in that: The photovoltaic output curve f of the integrated power station on the target day d d,PV (R t ,T t ,t) is: Among them, f S For photovoltaic panels under standard solar irradiance of 1000W / m 2 and the actual power at 25°C, η T is the power temperature coefficient of the photovoltaic cell, T d,t is the target temperature at time t on day d, R d,t is the surface solar irradiance at time t on the target day d.

9. A photovoltaic storage and charging integrated power station dispatching device, characterized in that: Photovoltaic only charges the energy storage system. When the photovoltaic power generation is lower than the rated capacity of the energy storage system, the energy storage system is charged from the grid until the rated capacity is reached. The energy storage system works at a frequency of one discharge per day. The scheduling device comprises: A fee determination module is used to determine the discharge service fee and charging service fee provided by the integrated power station to the electric vehicle within the target day, as well as the charging income obtained by the energy storage system from charging the electric vehicle within the target day; A function construction module is used to construct an objective function for minimizing the operating cost of the energy storage system based on the charging income, charging service fee, discharging service fee and the amount of electricity sent to the grid by the energy storage system; A constraint module is constructed to construct a constraint function based on the rated capacity of the energy storage system and the photovoltaic output curve of the integrated power station; The solution module is used to determine the time when the energy storage system switches from photovoltaic charging to grid charging within the target day, and the charging power of the energy storage system from the grid based on the objective function and the constraint function.

10. The photovoltaic storage and charging integrated power station dispatching device according to claim 9, characterized in that: The cost determination module is used to determine the revenue obtained by the energy storage system charging the electric vehicle within the target day based on the charging power, the number of charging times and the charging electricity price; Based on the number of charging times, charging time, and charging power provided by the integrated power station, as well as the charging service fee charged to the electric vehicle during each charging, determine the charging service fee that the integrated power station obtains when providing charging services to the electric vehicle within the target day; Based on the number of discharges, discharge time, and discharge power provided by the integrated power station, as well as the discharge service fee charged to the electric vehicle for each discharge, the discharge service fee obtained by the integrated power station when providing discharge services to the electric vehicle within the target day is determined.

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