Regional power grid energy storage adjustable capability calculation method and device considering power station and power grid constraints

Abstract

The invention relates to the technical field of large-scale application of energy storage, and particularly provides a regional power grid energy storage adjustable capacity calculation method and device considering power station and power grid constraints, and the method comprises the steps: determining an energy storage power station output constraint of a regional power grid based on a comparison result of a power grid net load of the regional power grid and thermal power technology output; adding the output constraint of the energy storage power station to a constraint condition of a pre-constructed regional power grid energy storage adjustable capability calculation model, and solving the pre-constructed regional power grid energy storage adjustable capability calculation model to obtain each energy storage adjustable capability in the regional power grid; determining the adjustable capability of the regional power grid based on each energy storage adjustable capability in the regional power grid; according to the technical scheme provided by the invention, the adjustable power time sequence condition of the energy storage power station in the regional power grid can be reflected more objectively, and the problem that an existing adjustable capability evaluation method is insufficient in accuracy is solved.

Description

Technical Field

[0001] This invention relates to the field of large-scale application technology of energy storage, and specifically to a method and apparatus for calculating the adjustable capacity of regional power grid energy storage considering the constraints of power plants and power grids. Background Technology

[0002] The large-scale application of energy storage is an effective way to solve the balance and security problems of new power systems. With the rapid development of global energy storage capacity, the assessment of the adjustability of energy storage is the basis for carrying out the scientific and rational use of energy storage.

[0003] Currently, in-depth research has not been conducted on the assessment of energy storage adjustability. The main method for calculating the adjustability of energy storage power stations is to compare the current power of the energy storage with the rated charge / discharge power and then calculate the difference. However, existing methods fail to consider two issues: first, capacity constraints caused by faults or maintenance during the operation of the energy storage power station; and second, the inability to release the energy storage's charge / discharge capacity due to grid operation constraints. Therefore, they cannot accurately reflect the energy storage's support capacity for the grid.

[0004] Therefore, based on existing adjustable capacity calculation methods, it is necessary to construct a regional power grid energy storage adjustment capacity calculation method that considers energy storage power obstruction and grid operation constraints, so as to obtain the actual dischargeable power and dischargeable power that the energy storage power station can provide to the grid. Summary of the Invention

[0005] To overcome the above-mentioned shortcomings, this invention proposes a method and apparatus for calculating the adjustable energy storage capacity of a regional power grid that takes into account the constraints of power plants and power grids.

[0006] Firstly, a method for calculating the adjustable energy storage capacity of a regional power grid considering power plant and grid constraints is provided. This method includes:

[0007] The output constraints of energy storage power stations in the regional power grid are determined based on the comparison results between the net load of the regional power grid and the output of thermal power technology.

[0008] The output constraints of the energy storage power station are added to the constraints of the pre-built regional power grid energy storage adjustable capacity calculation model, and the pre-built regional power grid energy storage adjustable capacity calculation model is solved to obtain the adjustable capacity of each energy storage in the regional power grid.

[0009] The adjustable capacity of the regional power grid is determined based on the adjustable capacity of each energy storage unit in the regional power grid.

[0010] Wherein, when the energy storage adjustable capacity is the maximum rechargeable capacity of the energy storage power station, the pre-constructed regional power grid energy storage adjustable capacity calculation model includes: a first objective function and constraints with the goal of maximizing the energy storage charging capacity; when the energy storage adjustable capacity is the maximum dischargeable capacity of the energy storage power station, the pre-constructed regional power grid energy storage adjustable capacity calculation model includes: a second objective function and constraints with the goal of maximizing the energy storage discharging capacity.

[0011] Preferably, the net load of the regional power grid is as follows:

[0012]

[0013] In the above formula, Let t be the net load of the power grid. Let t be the predicted electricity load of the power grid. For the nth w Predicted power generation of N wind farms at time t. w For the number of wind farms in the power grid, For the nth P The predicted power generation of a photovoltaic power station at time t, n P This refers to the number of photovoltaic power plants connected to the power grid.

[0014] Furthermore, the comparison results of the thermal power output of the regional power grid are as follows:

[0015]

[0016] In the above formula, For the maximum technical output of thermal power at time t, For the nth F Rated capacity of each thermal power unit For the nth F The operating status coefficient of a thermal power unit at time t. For the nth F The maximum technical output coefficient of each thermal power unit, N F The number of thermal power units in the power grid. The minimum technical output of thermal power at time t. For the nth F Minimum technical output coefficient of each thermal power unit.

[0017] Furthermore, the comparison between the net load of the regional power grid and the output of thermal power technology determines the output constraint of the energy storage power station in the regional power grid, including:

[0018] when At that time, the output constraint of the energy storage power station is: the energy storage power station is prohibited from discharging and satisfies:

[0019]

[0020] when At that time, the output constraint of the energy storage power station is: the energy storage power station is prohibited from charging and meets the following conditions:

[0021]

[0022] when At that time, the output constraint of the energy storage power station is: the energy storage power station satisfies:

[0023]

[0024] In the above formula, nth S The active power of an energy storage power station at time t. For the nth S The physical limit of the maximum rechargeable power of an energy storage power station at time t. For the nth S The physical limit of the maximum discharge power of an energy storage power station at time t.

[0025] Furthermore, the nth S The physical limit of the maximum rechargeable power of the energy storage power station at time t and the nth time. S The physical limit of the maximum discharge power of an energy storage power station at time t is as follows:

[0026]

[0027] In the above formula, For the nth S Rated charging power of each energy storage station For the nth S The charging power of an energy storage power station at time t is hindered. For the nth S The rated discharge power of each energy storage power station For the nth S The power of a storage power station that is blocked from discharging at time t.

[0028] Preferably, the first objective function is as follows:

[0029]

[0030] The second objective function is as follows:

[0031]

[0032] In the above formula, nth S The active power of an energy storage power station at time t, N S N represents the number of grid-connected energy storage power stations. T This represents the number of moments in the calculation.

[0033] Furthermore, the constraints include: node power balance constraints, line power flow constraints, energy storage power station power constraints, thermal power unit output constraints, and thermal power unit ramping constraints.

[0034] Furthermore, the constraints are as follows:

[0035]

[0036]

[0037] In the above formula, For node k Active power is injected into the power source at time t. The number of power sources at node k. Let t be the active power flow from node k to node s. This represents the number of nodes connected to node k. For the electrical load of the busbar at node k, Let t be the active power flow from node k to node s. The rated capacity of the line is ks. For the nth S Energy state of an energy storage power station at time t For the nth S Energy state of an energy storage power station at time t-1 For the nth S The active power of an energy storage power station at time t-1, where Δt is the duration of each time point. For the nth S Rated charging capacity of an energy storage power station For the nth S The energy storage power station experiences charging obstruction at time t. For the nth S Rated discharge capacity of an energy storage power station For the nth S The energy storage power station experiences energy discharge resistance at time t. For the nth S Energy status limit of an energy storage power station For the nth S The upper limit of the energy state of an energy storage power station For the nth F The output of each thermal power unit at time t. For the nth F Rated capacity of each thermal power unit For the nth F The operating status of a thermal power unit at time t. For the nth F Maximum technical output coefficient of each thermal power unit For the nth FMinimum technical output coefficient of each thermal power unit For the nth F The output of each thermal power unit at time t. For the nth F Output of each thermal power unit at time t-1 For the nth F The maximum increase in output per unit time for each thermal power unit For the nth F The maximum output of a thermal power unit is reduced per unit time.

[0038] Preferably, the adjustable capability of the regional power grid is as follows:

[0039]

[0040] In the above formula, For the regional power grid at time t, n a The maximum rechargeable power of energy storage, For the regional power grid at time t, n a The nth as The maximum rechargeable power of the energy storage power station, N as For the regional power grid n a Number of energy storage power stations in China For the regional power grid at time t, n a The maximum discharge power of the energy storage, For the regional power grid at time t, n a The nth as The maximum discharge power of the energy storage power station.

[0041] Secondly, a regional power grid energy storage adjustable capacity calculation device considering power plant and power grid constraints is provided, the regional power grid energy storage adjustable capacity calculation device considering power plant and power grid constraints includes:

[0042] The first determining module is used to determine the output constraints of the energy storage power station of the regional power grid based on the comparison results of the net load of the regional power grid and the output of thermal power technology.

[0043] The analysis module is used to add the output constraints of the energy storage power station to the constraints of the pre-built regional power grid energy storage adjustable capacity calculation model and solve the pre-built regional power grid energy storage adjustable capacity calculation model to obtain the adjustable capacity of each energy storage in the regional power grid.

[0044] The second determining module is used to determine the adjustable capacity of the regional power grid based on the adjustable capacity of each energy storage unit in the regional power grid.

[0045] Wherein, when the energy storage adjustable capacity is the maximum rechargeable capacity of the energy storage power station, the pre-constructed regional power grid energy storage adjustable capacity calculation model includes: a first objective function and constraints with the goal of maximizing the energy storage charging capacity; when the energy storage adjustable capacity is the maximum dischargeable capacity of the energy storage power station, the pre-constructed regional power grid energy storage adjustable capacity calculation model includes: a second objective function and constraints with the goal of maximizing the energy storage discharging capacity.

[0046] Thirdly, a computer device is provided, comprising: one or more processors;

[0047] The processor is used to store one or more programs;

[0048] When the one or more programs are executed by the one or more processors, the method for calculating the adjustable energy storage capacity of a regional power grid considering power plant and grid constraints is implemented.

[0049] Fourthly, a computer-readable storage medium is provided, on which a computer program is stored, wherein when the computer program is executed, the method for calculating the adjustable energy storage capacity of a regional power grid considering the constraints of power plants and power grids is implemented.

[0050] The above-described technical solutions of the present invention have at least one or more of the following beneficial effects:

[0051] This invention provides a method and apparatus for calculating the adjustable capacity of regional power grid energy storage considering power plant and grid constraints. The method includes: determining the output constraints of energy storage power plants in the regional power grid based on a comparison of the net load of the grid and the output of thermal power technology; adding the output constraints of the energy storage power plants to the constraints of a pre-constructed regional power grid energy storage adjustable capacity calculation model and solving the pre-constructed model to obtain the adjustable capacity of each energy storage unit in the regional power grid; and determining the adjustable capacity of the regional power grid based on the adjustable capacity of each energy storage unit. The technical solution provided by this invention can more objectively reflect the adjustable power timing of energy storage power plants in the regional power grid, solving the problem of insufficient accuracy in existing adjustable capacity assessment methods. Specifically:

[0052] 1) The energy storage regulation capacity calculation method provided by the present invention takes into account the power obstruction caused by faults, planned maintenance and other reasons during the operation of the energy storage power station. By dynamically deducting the obstructed power, it truly reflects the actual charging and discharging capacity of the energy storage power station.

[0053] 2) The energy storage regulation capacity calculation method provided by this invention takes into account the constraints of grid operation. By comparing the maximum and minimum technical output of thermal power with the net load, the overall adjustable power space of energy storage is calculated. The calculation of the adjustable capacity of energy storage power station is transformed into an optimization problem. By considering grid operation constraints such as node balance and line power flow, the maximum discharge power and maximum discharge capacity of energy storage power station are calculated respectively, so as to avoid the occurrence of problems such as line power flow exceeding limits in actual energy storage use. Attached Figure Description

[0054] Figure 1 This is a schematic diagram of the main steps of the method for calculating the adjustable energy storage capacity of a regional power grid considering the constraints of power plants and power grids in an embodiment of the present invention. Detailed Implementation

[0055] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0056] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0057] Example 1

[0058] See appendix Figure 1 , Figure 1 This is a schematic flowchart illustrating the main steps of a method for calculating the adjustable energy storage capacity of a regional power grid, considering power plant and grid constraints, according to an embodiment of the present invention. Figure 1 As shown, the method for calculating the adjustable capacity of regional power grid energy storage considering power plant and grid constraints in this embodiment of the invention mainly includes the following steps:

[0059] Step S101: Determine the output constraints of the energy storage power station of the regional power grid based on the comparison results of the net load of the regional power grid and the output of thermal power technology.

[0060] The output constraints of the energy storage power station are added to the constraints of the pre-built regional power grid energy storage adjustable capacity calculation model, and the pre-built regional power grid energy storage adjustable capacity calculation model is solved to obtain the adjustable capacity of each energy storage in the regional power grid.

[0061] The adjustable capacity of the regional power grid is determined based on the adjustable capacity of each energy storage unit in the regional power grid.

[0062] Wherein, when the energy storage adjustable capacity is the maximum rechargeable capacity of the energy storage power station, the pre-constructed regional power grid energy storage adjustable capacity calculation model includes: a first objective function and constraints with the goal of maximizing the energy storage charging capacity; when the energy storage adjustable capacity is the maximum dischargeable capacity of the energy storage power station, the pre-constructed regional power grid energy storage adjustable capacity calculation model includes: a second objective function and constraints with the goal of maximizing the energy storage discharging capacity.

[0063] In this embodiment, the net load of the regional power grid is as follows:

[0064]

[0065] In the above formula, Let t be the net load of the power grid. Let t be the predicted electricity load of the power grid. For the nth w Predicted power generation of N wind farms at time t. w For the number of wind farms in the power grid, For the nth P The predicted power generation of a photovoltaic power station at time t, N P This refers to the number of photovoltaic power plants connected to the power grid.

[0066] In one embodiment, the comparison results of the thermal power output of the regional power grid are as follows:

[0067]

[0068] In the above formula, For the maximum technical output of thermal power at time t, For the nth F Rated capacity of each thermal power unit For the nth F The operating status coefficient of a thermal power unit at time t. For the nth F The maximum technical output coefficient of each thermal power unit, N F The number of thermal power units in the power grid. The minimum technical output of thermal power at time t. For the nth F Minimum technical output coefficient of each thermal power unit.

[0069] In one implementation, the determination of the energy storage power station output constraint of the regional power grid based on the comparison result of the net load of the regional power grid and the output of thermal power technology includes:

[0070] when At that time, the output constraint of the energy storage power station is: the energy storage power station is prohibited from discharging and satisfies:

[0071]

[0072] when At that time, the output constraint of the energy storage power station is: the energy storage power station is prohibited from charging and meets the following conditions:

[0073]

[0074] when At that time, the output constraint of the energy storage power station is: the energy storage power station satisfies:

[0075]

[0076] In the above formula, nth S The active power of an energy storage power station at time t. For the nth S The physical limit of the maximum rechargeable power of an energy storage power station at time t. For the nth S The physical limit of the maximum discharge power of an energy storage power station at time t.

[0077] In one implementation, the nth S The physical limit of the maximum rechargeable power of the energy storage power station at time t and the nth time. S The physical limit of the maximum discharge power of an energy storage power station at time t is as follows:

[0078]

[0079] In the above formula, For the nth S Rated charging power of each energy storage station For the nth S The charging power of an energy storage power station at time t is hindered. For the nth S The rated discharge power of each energy storage power station For the nth S The power of a storage power station that is blocked from discharging at time t.

[0080] In this embodiment, the first objective function is as follows:

[0081]

[0082] The second objective function is as follows:

[0083]

[0084] In the above formula, nth S The active power of an energy storage power station at time t, N S N represents the number of grid-connected energy storage power stations. T This represents the number of moments in the calculation.

[0085] In one embodiment, the constraints include: node power balance constraints, line power flow constraints, energy storage power station power constraints, thermal power unit output constraints, and thermal power unit ramping constraints.

[0086] In one implementation, the constraint conditions are as follows:

[0087]

[0088] In the above formula, For node k Active power is injected into the power source at time t. The number of power sources at node k. Let t be the active power flow from node k to node s. This represents the number of nodes connected to node k. For the electrical load of the busbar at node k, Let t be the active power flow from node k to node s. The rated capacity of the line is ks. For the nth S Energy state of an energy storage power station at time t For the nth S Energy state of an energy storage power station at time t-1 For the nth S The active power of an energy storage power station at time t-1, where Δt is the duration of each time point. For the nth S Rated charging capacity of an energy storage power station For the nth S The energy storage power station experiences charging obstruction at time t. For the nth S Rated discharge capacity of an energy storage power station For the nth S The energy storage power station experiences energy discharge resistance at time t. For the nth S Energy status limit of an energy storage power station For the nth S The upper limit of the energy state of an energy storage power station For the nth F The output of each thermal power unit at time t. For the nth F Rated capacity of each thermal power unit For the nth F The operating status of a thermal power unit at time t. For the nth F Maximum technical output coefficient of each thermal power unit For the nth FMinimum technical output coefficient of each thermal power unit For the nth F The output of each thermal power unit at time t. For the nth F Output of each thermal power unit at time t-1 For the nth F The maximum increase in output per unit time for each thermal power unit For the nth F The maximum output of a thermal power unit is reduced per unit time.

[0089] In this embodiment, the adjustable capability of the regional power grid is as follows:

[0090]

[0091] In the above formula, For the regional power grid at time t, n a The maximum rechargeable power of energy storage, For the regional power grid at time t, n a The nth as The maximum rechargeable power of the energy storage power station, N as For the regional power grid n a Number of energy storage power stations in China For the regional power grid at time t, n a The maximum discharge power of the energy storage, For the regional power grid at time t, n a The nth as The maximum discharge power of the energy storage power station.

[0092] Example 2

[0093] Secondly, a regional power grid energy storage adjustable capacity calculation device considering power plant and power grid constraints is provided, the regional power grid energy storage adjustable capacity calculation device considering power plant and power grid constraints includes:

[0094] The first determining module is used to determine the output constraints of the energy storage power station of the regional power grid based on the comparison results of the net load of the regional power grid and the output of thermal power technology.

[0095] The analysis module is used to add the output constraints of the energy storage power station to the constraints of the pre-built regional power grid energy storage adjustable capacity calculation model and solve the pre-built regional power grid energy storage adjustable capacity calculation model to obtain the adjustable capacity of each energy storage in the regional power grid.

[0096] The second determining module is used to determine the adjustable capacity of the regional power grid based on the adjustable capacity of each energy storage unit in the regional power grid.

[0097] Wherein, when the energy storage adjustable capacity is the maximum rechargeable capacity of the energy storage power station, the pre-constructed regional power grid energy storage adjustable capacity calculation model includes: a first objective function and constraints with the goal of maximizing the energy storage charging capacity; when the energy storage adjustable capacity is the maximum dischargeable capacity of the energy storage power station, the pre-constructed regional power grid energy storage adjustable capacity calculation model includes: a second objective function and constraints with the goal of maximizing the energy storage discharging capacity.

[0098] Preferably, the net load of the regional power grid is as follows:

[0099]

[0100] In the above formula, Let t be the net load of the power grid. Let t be the predicted electricity load of the power grid. For the nth w Predicted power generation of N wind farms at time t. w For the number of wind farms in the power grid, For the nth P The predicted power generation of a photovoltaic power station at time t, N P This refers to the number of photovoltaic power plants connected to the power grid.

[0101] Furthermore, the comparison results of the thermal power output of the regional power grid are as follows:

[0102]

[0103] In the above formula, For the maximum technical output of thermal power at time t, For the nth F Rated capacity of each thermal power unit For the nth F The operating status coefficient of a thermal power unit at time t. For the nth F The maximum technical output coefficient of each thermal power unit, N F The number of thermal power units in the power grid. The minimum technical output of thermal power at time t. For the nth F Minimum technical output coefficient of each thermal power unit.

[0104] Furthermore, the comparison between the net load of the regional power grid and the output of thermal power technology determines the output constraint of the energy storage power station in the regional power grid, including:

[0105] when At that time, the output constraint of the energy storage power station is: the energy storage power station is prohibited from discharging and satisfies:

[0106]

[0107] when At that time, the output constraint of the energy storage power station is: the energy storage power station is prohibited from charging and meets the following conditions:

[0108]

[0109] when At that time, the output constraint of the energy storage power station is: the energy storage power station satisfies:

[0110]

[0111] In the above formula, nth S The active power of an energy storage power station at time t. For the nth S The physical limit of the maximum rechargeable power of an energy storage power station at time t. For the nth S The physical limit of the maximum discharge power of an energy storage power station at time t.

[0112] Furthermore, the nth S The physical limit of the maximum rechargeable power of the energy storage power station at time t and the nth time. S The physical limit of the maximum discharge power of an energy storage power station at time t is as follows:

[0113]

[0114] In the above formula, For the nth S Rated charging power of each energy storage station For the nth S The charging power of an energy storage power station at time t is hindered. For the nth S The rated discharge power of each energy storage power station For the nth S The power of a storage power station that is blocked from discharging at time t.

[0115] Preferably, the first objective function is as follows:

[0116]

[0117] The second objective function is as follows:

[0118]

[0119] In the above formula, nth S The active power of an energy storage power station at time t, N S N represents the number of grid-connected energy storage power stations. T This represents the number of moments in the calculation.

[0120] Furthermore, the constraints include: node power balance constraints, line power flow constraints, energy storage power station power constraints, thermal power unit output constraints, and thermal power unit ramping constraints.

[0121] Furthermore, the constraints are as follows:

[0122]

[0123]

[0124] In the above formula, For node k Active power is injected into the power source at time t. The number of power sources at node k. Let t be the active power flow from node k to node s. This represents the number of nodes connected to node k. For the electrical load of the busbar at node k, Let t be the active power flow from node k to node s. The rated capacity of the line is ks. For the nth S Energy state of an energy storage power station at time t For the nth S Energy state of an energy storage power station at time t-1 For the nth S The active power of an energy storage power station at time t-1, where Δt is the duration of each time point. For the nth S Rated charging capacity of an energy storage power station For the nth S The energy storage power station experiences charging obstruction at time t. For the nth S Rated discharge capacity of an energy storage power station For the nth S The energy storage power station experiences energy discharge resistance at time t. For the nth S Energy status limit of an energy storage power station For the nth S The upper limit of the energy state of an energy storage power station For the nth F The output of each thermal power unit at time t. For the nth F Rated capacity of each thermal power unit For the nth F The operating status of a thermal power unit at time t. For the nth F Maximum technical output coefficient of each thermal power unit For the nth FMinimum technical output coefficient of each thermal power unit For the nth F The output of each thermal power unit at time t. For the nth F Output of each thermal power unit at time t-1 For the nth F The maximum increase in output per unit time for each thermal power unit For the nth F The maximum output of a thermal power unit is reduced per unit time.

[0125] Preferably, the adjustable capability of the regional power grid is as follows:

[0126]

[0127] In the above formula, For the regional power grid at time t, n a The maximum rechargeable power of energy storage, For the regional power grid at time t, n a The nth as The maximum rechargeable power of the energy storage power station, N as For the regional power grid n a Number of energy storage power stations in China For the regional power grid at time t, n a The maximum discharge power of the energy storage, For the regional power grid at time t, n a The nth as The maximum discharge power of the energy storage power station.

[0128] Example 3

[0129] Based on the same inventive concept, this invention also provides a computer device, which includes a processor and a memory. The memory stores a computer program, which includes program instructions. The processor executes the program instructions stored in the computer storage medium. The processor may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing and control core of the terminal, suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in the computer storage medium to implement corresponding method flows or corresponding functions, thereby realizing the steps of the method for calculating the adjustable energy storage capacity of a regional power grid considering power plant and power grid constraints in the above embodiments.

[0130] Example 4

[0131] Based on the same inventive concept, this invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device used to store programs and data. It is understood that the computer-readable storage medium here can include both the built-in storage medium in the computer device and extended storage media supported by the computer device. The computer-readable storage medium provides storage space that stores the terminal's operating system. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more computer programs (including program code). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk storage device. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the method for calculating the adjustable capacity of regional power grid energy storage considering power plant and grid constraints in the above embodiments.

[0132] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0133] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0134] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0135] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0136] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for calculating the adjustable energy storage capacity of a regional power grid considering power plant and grid constraints, characterized in that, The method includes: The output constraints of energy storage power stations in the regional power grid are determined based on the comparison results between the net load of the regional power grid and the output of thermal power technology. The output constraints of the energy storage power station are added to the constraints of the pre-built regional power grid energy storage adjustable capacity calculation model, and the pre-built regional power grid energy storage adjustable capacity calculation model is solved to obtain the adjustable capacity of each energy storage in the regional power grid. The adjustable capacity of the regional power grid is determined based on the adjustable capacity of each energy storage unit in the regional power grid. Wherein, when the energy storage adjustable capacity is the maximum rechargeable capacity of the energy storage power station, the pre-constructed regional power grid energy storage adjustable capacity calculation model includes: a first objective function and constraints with the goal of maximizing the energy storage charging capacity; when the energy storage adjustable capacity is the maximum dischargeable capacity of the energy storage power station, the pre-constructed regional power grid energy storage adjustable capacity calculation model includes: a second objective function and constraints with the goal of maximizing the energy storage discharging capacity.

2. The method as described in claim 1, characterized in that, The net load of the regional power grid is as follows: In the above formula, Let t be the net load of the power grid. Let t be the predicted electricity load of the power grid. For the nth w Predicted power generation of N wind farms at time t. w For the number of wind farms in the power grid, For the nth P The predicted power generation of a photovoltaic power station at time t, N P This refers to the number of photovoltaic power plants connected to the power grid.

3. The method as described in claim 2, characterized in that, The comparison results of thermal power output in the aforementioned regional power grids are as follows: In the above formula, To achieve the maximum technical output of thermal power at time t, For the nth F Rated capacity of each thermal power unit For the nth F The operating status coefficient of a thermal power unit at time t. For the nth F The maximum technical output coefficient of each thermal power unit, N F For the number of thermal power units in the power grid, The minimum technical output of thermal power at time t. For the nth F Minimum technical output coefficient of each thermal power unit.

4. The method as described in claim 3, characterized in that, The comparison results between the net load of the regional power grid and the output of thermal power technology determine the output constraints of energy storage power stations in the regional power grid, including: when At that time, the output constraint of the energy storage power station is: the energy storage power station is prohibited from discharging and satisfies: when At that time, the output constraint of the energy storage power station is: the energy storage power station is prohibited from charging and meets the following conditions: when At that time, the output constraint of the energy storage power station is: the energy storage power station satisfies: In the above formula, nth S The active power of an energy storage power station at time t. For the nth S The physical limit of the maximum rechargeable power of an energy storage power station at time t. For the nth S The physical limit of the maximum discharge power of an energy storage power station at time t.

5. The method as described in claim 4, characterized in that, The nth S The physical limit of the maximum rechargeable power of the energy storage power station at time t and the nth time. S The physical limit of the maximum discharge power of an energy storage power station at time t is as follows: In the above formula, For the nth S Rated charging power of each energy storage station For the nth S The charging power of an energy storage power station at time t is hindered. For the nth S The rated discharge power of each energy storage power station For the nth S The power of a storage power station that is blocked from discharging at time t.

6. The method as described in claim 1, characterized in that, The first objective function is as follows: The second objective function is as follows: In the above formula, nth S The active power of an energy storage power station at time t, N S N represents the number of grid-connected energy storage power stations. T This represents the number of moments in the calculation.

7. The method as described in claim 6, characterized in that, The constraints include: node power balance constraints, line power flow constraints, energy storage power station power constraints, thermal power unit output constraints, and thermal power unit ramping constraints.

8. The method as described in claim 7, characterized in that, The constraints are as follows: In the above formula, For node k Active power is injected into the power source at time t. The number of power sources at node k. Let t be the active power flow from node k to node s. This represents the number of nodes connected to node k. For the electrical load of the busbar at node k, Let t be the active power flow from node k to node s. The rated capacity of the line is ks. For the nth S Energy state of an energy storage power station at time t For the nth S Energy state of an energy storage power station at time t-1 For the nth S The active power of an energy storage power station at time t-1, where Δt is the duration of each time point. For the nth S Rated charging capacity of an energy storage power station For the nth S The energy storage power station experiences charging obstruction at time t. For the nth S Rated discharge capacity of an energy storage power station For the nth S The energy storage power station experiences energy discharge resistance at time t. For the nth S Energy status limit of an energy storage power station For the nth S The upper limit of the energy state of an energy storage power station For the nth F The output of each thermal power unit at time t. For the nth F Rated capacity of each thermal power unit For the nth F The operating status of a thermal power unit at time t. For the nth F Maximum technical output coefficient of each thermal power unit For the nth F Minimum technical output coefficient of each thermal power unit For the nth F The output of each thermal power unit at time t. For the nth F Output of each thermal power unit at time t-1 For the nth F The maximum increase in output per unit time for each thermal power unit For the nth F The maximum output of a thermal power unit is reduced per unit time.

9. The method as described in claim 1, characterized in that, The adjustable capacity of the regional power grid is as follows: In the above formula, For the regional power grid at time t, n a The maximum rechargeable power of energy storage, For the regional power grid at time t, n a The nth as The maximum rechargeable power of the energy storage power station, N as For the regional power grid n a Number of energy storage power stations in China For the regional power grid at time t, n a The maximum discharge power of the energy storage, For the regional power grid at time t, n a The nth as The maximum discharge power of the energy storage power station.

10. An apparatus for calculating the adjustable capacity of regional power grid energy storage based on the method for considering power plant and grid constraints according to any one of claims 1-9, characterized in that, The device includes: The first determining module is used to determine the output constraints of the energy storage power station of the regional power grid based on the comparison results of the net load of the regional power grid and the output of thermal power technology. The analysis module is used to add the output constraints of the energy storage power station to the constraints of the pre-built regional power grid energy storage adjustable capacity calculation model and solve the pre-built regional power grid energy storage adjustable capacity calculation model to obtain the energy storage adjustable capacity of each energy storage in the regional power grid. The second determining module is used to determine the adjustable capacity of the regional power grid based on the adjustable capacity of each energy storage unit in the regional power grid. Wherein, when the energy storage adjustable capacity is the maximum rechargeable capacity of the energy storage power station, the pre-constructed regional power grid energy storage adjustable capacity calculation model includes: a first objective function and constraints with the goal of maximizing the energy storage charging capacity; when the energy storage adjustable capacity is the maximum dischargeable capacity of the energy storage power station, the pre-constructed regional power grid energy storage adjustable capacity calculation model includes: a second objective function and constraints with the goal of maximizing the energy storage discharging capacity.

11. A computer device, characterized in that, include: One or more processors; The processor is used to execute one or more programs; When the one or more programs are executed by the one or more processors, the method for calculating the adjustable capacity of regional power grid energy storage considering power plant and grid constraints as described in any one of claims 1 to 9 is implemented.

12. A computer-readable storage medium, characterized in that, It contains a computer program, which, when executed, implements the method for calculating the adjustable energy storage capacity of a regional power grid considering power plant and grid constraints as described in any one of claims 1 to 9.

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