Method and system for evaluating new energy scale improvement capability of reactive compensation equipment

Abstract

The invention discloses a method and system for evaluating the new energy scale improvement capability of reactive compensation equipment, and belongs to the technical field of high-proportion new energy power systems. The method comprises the following steps: establishing an analysis model for reactive compensation equipment of a high-proportion new energy power system; based on the analysis model, calculating to obtain a coupling influence factor of the reactive compensation equipment; and on the basis of the coupling influence factor, determining the improvement capability of the reactive compensation equipment on the new energy grid-connected scale. According to the method, a matching mechanism for evaluating the new energy grid-connected scale and the reactive power compensation equipment capability is established annually, so that power system planners can analyze the reactive power demand of the system according to the new energy grid-connected scale and select proper reactive power compensation equipment as required.

Description

Technical Field

[0001] The present invention relates to the technical field of high-proportion renewable energy power systems, and more specifically, to a method and system for evaluating the capability of reactive power compensation equipment to increase the scale of renewable energy. Background Art

[0002] With the continuous increase in the proportion of renewable energy power generation, especially in the process of grid connection of renewable energy such as wind power and solar energy, the reactive power compensation capacity of the power system has become an important factor restricting its power transmission capacity. New energy generator sets are usually composed of power electronic devices (such as inverters), which cannot provide sufficient reactive power support, resulting in voltage instability and other problems in the system when the scale of grid connection is expanded. In order to solve this problem, it is usually necessary to install static VAR compensators (SVG) and other equipment at new energy sites to improve the reactive power compensation capacity of the system, so as to support larger-scale new energy grid connection. However, the existing technology still lacks a systematic and standardized method for quantitatively evaluating the ability of reactive power compensation equipment to improve the scale of new energy grid connection. Summary of the invention

[0003] In view of the above problems, the present invention proposes a method for evaluating the ability of reactive power compensation equipment to improve the scale of new energy, including:

[0004] Establish an analysis model for reactive power compensation equipment in power systems with a high proportion of renewable energy;

[0005] Based on the analysis model, a coupling influence factor of the reactive compensation device is calculated;

[0006] Based on the coupling influencing factors, the ability of reactive power compensation equipment to improve the scale of renewable energy grid connection is determined.

[0007] Optionally, analyze the model as follows:

[0008]

[0009] Among them, B is the analysis model, Q C is the maximum capacity of the reactive power compensation equipment, and U is the grid connection point voltage of the reactive power compensation equipment.

[0010] Optionally, the calculated coupling influence factor of the reactive compensation device includes:

[0011] The reactive power impact factor of new energy considering the influence of reactive compensation equipment, the coupling impact factor of new energy units and reactive compensation equipment, and the coupling impact factor of high-proportion new energy power system and reactive compensation equipment.

[0012] Optionally, the reactive power impact factor of new energy sources taking into account the impact of reactive power compensation equipment is calculated. The calculation formula is as follows:

[0013] γ=QBZ 2

[0014] Among them, γ is the reactive power influencing factor of new energy considering the influence of reactive compensation equipment, B is the analysis model, Q is the reactive power output by the new energy unit, and Z is the equivalent impedance of the system.

[0015] Optionally, the coupling influence factor between the new energy unit and the reactive compensation equipment is calculated, and the calculation formula is as follows:

[0016] β=1-2BX+B 2 Z 2

[0017] Among them, β is the coupling influence factor between the new energy unit and the reactive compensation equipment, B is the analysis model, Z is the system equivalent impedance, and X is the system equivalent reactance.

[0018] Optionally, the coupling influence factor between the high-proportion new energy power system and the reactive compensation equipment is calculated, and the calculation formula is as follows:

[0019] α=BZ 2

[0020] Among them, α is the coupling influence factor between the high-proportion new energy power system and the reactive compensation equipment, B is the analysis model, and Z is the system equivalent impedance.

[0021] Optionally, based on the coupling influence factor, determining the ability of reactive power compensation equipment to improve the scale of renewable energy grid connection includes:

[0022] Based on the coupling influence factors, a first new energy grid-connected scale calculation model considering the influence of reactive compensation equipment and a second new energy grid-connected scale calculation model not considering the influence of reactive compensation equipment are respectively established;

[0023] Based on the first new energy grid-connected scale calculation model and the second new energy grid-connected scale calculation model, a reactive power compensation equipment capacity improvement model for the new energy grid-connected scale is established;

[0024] Based on the improvement capacity model, the improvement capacity of the reactive power compensation equipment for the scale of new energy grid connection is calculated.

[0025] Optional, the first new energy grid-connected scale calculation model, the formula is as follows:

[0026]

[0027] Among them, P Bis the scale of new energy grid connection after considering reactive compensation equipment, γ is the reactive influence factor of new energy considering the influence of reactive compensation equipment, β is the coupling influence factor between new energy units and reactive compensation equipment, α is the coupling influence factor between high-proportion new energy power system and reactive compensation equipment, Q is the reactive power output of new energy units, Z is the system equivalent impedance, R is the system equivalent resistance, X is the system equivalent reactance, and E is the system equivalent potential.

[0028] Optionally, the second new energy grid-connected scale calculation model is as follows:

[0029]

[0030] Among them, P R is the scale of new energy grid connection without considering the impact of reactive compensation equipment, Q is the reactive power output of the new energy unit, Z is the system equivalent impedance, R is the system equivalent resistance, X is the system equivalent reactance, and E is the system equivalent potential.

[0031] Optional, enhance the capability model, the formula is as follows:

[0032] ΔP=P B -P R

[0033] Among them, ΔP is the increase in the scale of new energy grid connection, P B To consider the scale of new energy grid connection after reactive power compensation equipment, P R It is the scale of new energy grid connection without considering the impact of reactive power compensation equipment.

[0034] On the other hand, the present invention also proposes an evaluation system for the ability of reactive power compensation equipment to improve the scale of new energy, comprising:

[0035] The initial unit is used to establish an analytical model for reactive power compensation equipment in power systems with a high proportion of renewable energy;

[0036] A calculation unit, used for calculating a coupling influence factor of a reactive compensation device based on the analysis model;

[0037] An evaluation unit is used to determine the ability of reactive power compensation equipment to improve the scale of renewable energy grid connection based on the coupling influence factor.

[0038] Optionally, analyze the model as follows:

[0039]

[0040] Among them, B is the analysis model, Q C is the maximum capacity of the reactive power compensation equipment, and U is the grid connection point voltage of the reactive power compensation equipment.

[0041] Optionally, the calculated coupling influence factor of the reactive compensation device includes:

[0042] The reactive power impact factor of new energy considering the influence of reactive compensation equipment, the coupling impact factor of new energy units and reactive compensation equipment, and the coupling impact factor of high-proportion new energy power system and reactive compensation equipment.

[0043] Optionally, the reactive power impact factor of new energy sources taking into account the impact of reactive power compensation equipment is calculated. The calculation formula is as follows:

[0044] γ=QBZ 2

[0045] Among them, γ is the reactive power influencing factor of new energy considering the influence of reactive compensation equipment, B is the analysis model, Q is the reactive power output by the new energy unit, and Z is the equivalent impedance of the system.

[0046] Optionally, the coupling influence factor between the new energy unit and the reactive compensation equipment is calculated, and the calculation formula is as follows:

[0047] β=1-2BX+B 2 Z 2

[0048] Among them, β is the coupling influence factor between the new energy unit and the reactive compensation equipment, B is the analysis model, Z is the system equivalent impedance, and X is the system equivalent reactance.

[0049] Optionally, the coupling influence factor between the high-proportion new energy power system and the reactive compensation equipment is calculated, and the calculation formula is as follows:

[0050] α=BZ 2

[0051] Among them, α is the coupling influence factor between the high-proportion new energy power system and the reactive compensation equipment, B is the analysis model, and Z is the system equivalent impedance.

[0052] Optionally, based on the coupling influence factor, determining the ability of reactive power compensation equipment to improve the scale of renewable energy grid connection includes:

[0053] Based on the coupling influence factors, a first new energy grid-connected scale calculation model considering the influence of reactive compensation equipment and a second new energy grid-connected scale calculation model not considering the influence of reactive compensation equipment are respectively established;

[0054] Based on the first new energy grid-connected scale calculation model and the second new energy grid-connected scale calculation model, a reactive power compensation equipment capacity improvement model for the new energy grid-connected scale is established;

[0055] Based on the improvement capacity model, the improvement capacity of the reactive power compensation equipment for the scale of new energy grid connection is calculated.

[0056] Optional, the first new energy grid-connected scale calculation model, the formula is as follows:

[0057]

[0058] Among them, P B is the scale of new energy grid connection after considering reactive compensation equipment, γ is the reactive influence factor of new energy considering the influence of reactive compensation equipment, β is the coupling influence factor between new energy units and reactive compensation equipment, α is the coupling influence factor between high-proportion new energy power system and reactive compensation equipment, Q is the reactive power output of new energy units, Z is the system equivalent impedance, R is the system equivalent resistance, X is the system equivalent reactance, and E is the system equivalent potential.

[0059] Optionally, the second new energy grid-connected scale calculation model is as follows:

[0060]

[0061] Among them, P R is the scale of new energy grid connection without considering the impact of reactive compensation equipment, Q is the reactive power output of the new energy unit, Z is the system equivalent impedance, R is the system equivalent resistance, X is the system equivalent reactance, and E is the system equivalent potential.

[0062] Optional, enhance the capability model, the formula is as follows:

[0063] ΔP=P B -P R

[0064] Among them, ΔP is the increase in the scale of new energy grid connection, P B To consider the scale of new energy grid connection after reactive power compensation equipment, P R It is the scale of new energy grid connection without considering the impact of reactive power compensation equipment.

[0065] In yet another aspect, the present invention further provides a computing device, comprising: one or more processors;

[0066] a processor for executing one or more programs;

[0067] When the one or more programs are executed by the one or more processors, the above-described method is implemented.

[0068] In yet another aspect, the present invention further provides a computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed, the method described above is implemented.

[0069] Compared with the prior art, the present invention has the following beneficial effects:

[0070] The present invention provides an evaluation method for the ability of reactive compensation equipment to increase the scale of new energy, including: establishing an analysis model for reactive compensation equipment in a high-proportion new energy power system; calculating the coupling influence factor of the reactive compensation equipment based on the analysis model; and determining the ability of reactive compensation equipment to increase the scale of new energy grid connection based on the coupling influence factor. The present invention establishes a matching mechanism for evaluating the scale of new energy grid connection and the capacity of reactive compensation equipment, which is beneficial for power system planners to analyze the reactive power demand of the system according to the scale of new energy grid connection and select appropriate reactive compensation equipment as needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0071] Figure 1 is a flow chart of the method of the present invention;

[0072] Figure 2 It is a structural diagram of the system of the present invention. DETAILED DESCRIPTION

[0073] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0074] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0075] Embodiment 1:

[0076] The present invention proposes a method for evaluating the ability of reactive power compensation equipment to increase the scale of new energy, such as Figure 1 As shown, including:

[0077] Step 1: Establish an analysis model for reactive power compensation equipment in a high-proportion renewable energy power system;

[0078] Step 2: Based on the analysis model, the coupling influence factor of the reactive compensation equipment is calculated;

[0079] Step 3: Based on the coupling influence factor, determine the ability of reactive power compensation equipment to improve the scale of new energy grid connection.

[0080] The analysis model is as follows:

[0081]

[0082] Among them, B is the analysis model, Q C is the maximum capacity of the reactive power compensation equipment, and U is the grid connection point voltage of the reactive power compensation equipment.

[0083] Among them, the calculated coupling influence factors of reactive compensation equipment include:

[0084] The reactive power impact factor of new energy considering the influence of reactive compensation equipment, the coupling impact factor of new energy units and reactive compensation equipment, and the coupling impact factor of high-proportion new energy power system and reactive compensation equipment.

[0085] Among them, the new energy reactive power impact factor considering the impact of reactive power compensation equipment is calculated, and the calculation formula is as follows:

[0086] γ=QBZ 2

[0087] Among them, γ is the reactive power influencing factor of new energy considering the influence of reactive compensation equipment, B is the analysis model, Q is the reactive power output by the new energy unit, and Z is the equivalent impedance of the system.

[0088] Among them, the coupling influence factor between the new energy unit and the reactive compensation equipment is calculated, and the calculation formula is as follows:

[0089] β=1-2BX+B 2 Z 2

[0090] Among them, β is the coupling influence factor between the new energy unit and the reactive compensation equipment, B is the analysis model, Z is the system equivalent impedance, and X is the system equivalent reactance.

[0091] Among them, the coupling influence factor between the high-proportion new energy power system and the reactive compensation equipment is calculated, and the calculation formula is as follows:

[0092] α=BZ 2

[0093] Among them, α is the coupling influence factor between the high-proportion new energy power system and the reactive compensation equipment, B is the analysis model, and Z is the system equivalent impedance.

[0094] Wherein, based on the coupling influencing factor, the ability of reactive power compensation equipment to improve the scale of renewable energy grid connection is determined, including:

[0095] Based on the coupling influence factors, a first new energy grid-connected scale calculation model considering the influence of reactive compensation equipment and a second new energy grid-connected scale calculation model not considering the influence of reactive compensation equipment are respectively established;

[0096] Based on the first new energy grid-connected scale calculation model and the second new energy grid-connected scale calculation model, a reactive power compensation equipment capacity improvement model for the new energy grid-connected scale is established;

[0097] Based on the improvement capacity model, the improvement capacity of the reactive power compensation equipment for the scale of new energy grid connection is calculated.

[0098] Among them, the calculation model of the grid-connected scale of the first new energy is as follows:

[0099]

[0100] Among them, P B is the scale of new energy grid connection after considering reactive compensation equipment, γ is the reactive influence factor of new energy considering the influence of reactive compensation equipment, β is the coupling influence factor between new energy units and reactive compensation equipment, α is the coupling influence factor between high-proportion new energy power system and reactive compensation equipment, Q is the reactive power output of new energy units, Z is the system equivalent impedance, R is the system equivalent resistance, X is the system equivalent reactance, and E is the system equivalent potential.

[0101] Among them, the calculation model of the second new energy grid-connected scale is as follows:

[0102]

[0103] Among them, P R is the scale of new energy grid connection without considering the impact of reactive compensation equipment, Q is the reactive power output of the new energy unit, Z is the system equivalent impedance, R is the system equivalent resistance, X is the system equivalent reactance, and E is the system equivalent potential.

[0104] Among them, the improvement capability model has the following formula:

[0105] ΔP=P B -P R

[0106] Among them, ΔP is the increase in the scale of new energy grid connection, P B To consider the scale of new energy grid connection after reactive power compensation equipment, P R It is the scale of new energy grid connection without considering the impact of reactive power compensation equipment.

[0107] The present invention is further described below with reference to specific cases:

[0108] Propose an analytical model for reactive power compensation equipment (such as SVG);

[0109] Propose a calculation method for the impact factors of new energy units and reactive power compensation equipment;

[0110] A calculation method for the ability of reactive power compensation equipment to increase the scale of renewable energy grid connection is proposed.

[0111] Optionally, an analytical model of a reactive power compensation device (such as SVG) is proposed, including:

[0112] According to the maximum capacity of reactive power compensation equipment, its analysis model is established:

[0113]

[0114] In the formula, Q c is the maximum capacity of the reactive compensation equipment, U is the grid connection point voltage of the reactive compensation equipment, and B is the analysis model of the reactive compensation equipment.

[0115] Optionally, a method for calculating the impact factor of new energy units and reactive power compensation equipment is proposed, including:

[0116] Establish the new energy reactive power impact factor considering the impact of reactive power compensation equipment:

[0117] γ=QBZ 2 (2)

[0118] In the formula, γ is the reactive power impact factor of renewable energy considering the impact of reactive compensation equipment, Q is the reactive power output by the renewable energy unit, and Z is the equivalent impedance of the system.

[0119] Establish the coupling influencing factors between new energy units and reactive power compensation equipment:

[0120] β=1-2BX+B 2 Z 2 (3)

[0121] In the formula, β is the coupling influence factor between the new energy unit and the reactive compensation equipment.

[0122] Establish the coupling influencing factors between the system and the reactive power compensation equipment:

[0123] α=BZ 2 (4)

[0124] Where α is the coupling influence factor between the system and the reactive compensation equipment.

[0125] Optionally, a method for calculating the ability of reactive power compensation equipment to improve the scale of renewable energy grid connection is proposed, including:

[0126] The calculation method for the scale of new energy grid connection considering the impact of reactive power compensation equipment is as follows:

[0127]

[0128] Where P B This is to consider the scale of new energy grid connection after reactive compensation equipment is installed.

[0129] Without considering the impact of reactive power compensation equipment, the calculation method for the scale of new energy grid connection is:

[0130]

[0131] Where P R It is the scale of new energy grid connection without considering the impact of reactive power compensation equipment.

[0132] The ability of reactive power compensation equipment to increase the scale of renewable energy grid connection is:

[0133] ΔP=P B -P R (7)

[0134] Where ΔP is the increase in the scale of new energy grid connection.

[0135] Embodiment 2:

[0136] The present invention also proposes an evaluation system 200 for the ability of reactive power compensation equipment to improve the scale of new energy, such as Figure 2 As shown, including:

[0137] An initial unit 201 is used to establish an analysis model for reactive power compensation equipment in a high-proportion renewable energy power system;

[0138] A calculation unit 202, configured to calculate a coupling influence factor of a reactive compensation device based on the analysis model;

[0139] The evaluation unit 203 is used to determine the ability of the reactive power compensation equipment to improve the scale of new energy grid connection based on the coupling influence factor.

[0140] The analysis model is as follows:

[0141]

[0142] Among them, B is the analysis model, Q C is the maximum capacity of the reactive power compensation equipment, and U is the grid connection point voltage of the reactive power compensation equipment.

[0143] Among them, the calculated coupling influence factors of reactive compensation equipment include:

[0144] The reactive power impact factor of new energy considering the influence of reactive compensation equipment, the coupling impact factor of new energy units and reactive compensation equipment, and the coupling impact factor of high-proportion new energy power system and reactive compensation equipment.

[0145] Among them, the new energy reactive power impact factor considering the impact of reactive power compensation equipment is calculated, and the calculation formula is as follows:

[0146] γ=QBZ 2

[0147] Among them, γ is the reactive power influencing factor of new energy considering the influence of reactive compensation equipment, B is the analysis model, Q is the reactive power output by the new energy unit, and Z is the equivalent impedance of the system.

[0148] Among them, the coupling influence factor between the new energy unit and the reactive compensation equipment is calculated, and the calculation formula is as follows:

[0149] β=1-2BX+B 2 Z 2

[0150] Among them, β is the coupling influence factor between the new energy unit and the reactive compensation equipment, B is the analysis model, Z is the system equivalent impedance, and X is the system equivalent reactance.

[0151] Among them, the coupling influence factor between the high-proportion new energy power system and the reactive compensation equipment is calculated, and the calculation formula is as follows:

[0152] α=BZ 2

[0153] Among them, α is the coupling influence factor between the high-proportion new energy power system and the reactive compensation equipment, B is the analysis model, and Z is the system equivalent impedance.

[0154] Wherein, based on the coupling influencing factor, the ability of reactive power compensation equipment to improve the scale of renewable energy grid connection is determined, including:

[0155] Based on the coupling influence factors, a first new energy grid-connected scale calculation model considering the influence of reactive compensation equipment and a second new energy grid-connected scale calculation model not considering the influence of reactive compensation equipment are respectively established;

[0156] Based on the first new energy grid-connected scale calculation model and the second new energy grid-connected scale calculation model, a reactive power compensation equipment capacity improvement model for the new energy grid-connected scale is established;

[0157] Based on the improvement capacity model, the improvement capacity of the reactive power compensation equipment for the scale of new energy grid connection is calculated.

[0158] Among them, the calculation model of the grid-connected scale of the first new energy is as follows:

[0159]

[0160] Among them, P Bis the scale of new energy grid connection after considering reactive compensation equipment, γ is the reactive influence factor of new energy considering the influence of reactive compensation equipment, β is the coupling influence factor between new energy units and reactive compensation equipment, α is the coupling influence factor between high-proportion new energy power system and reactive compensation equipment, Q is the reactive power output of new energy units, X is the system equivalent impedance, R is the system equivalent resistance, X is the system equivalent reactance, and E is the system equivalent potential.

[0161] Among them, the calculation model of the second new energy grid-connected scale is as follows:

[0162]

[0163] Among them, P R is the scale of new energy grid connection without considering the impact of reactive compensation equipment, Q is the reactive power output of the new energy unit, Z is the system equivalent impedance, R is the system equivalent resistance, X is the system equivalent reactance, and E is the system equivalent potential.

[0164] Among them, the improvement capability model has the following formula:

[0165] ΔP=P B -P R

[0166] Among them, ΔP is the increase in the scale of new energy grid connection, P B To consider the scale of new energy grid connection after reactive power compensation equipment, P R It is the scale of new energy grid connection without considering the impact of reactive power compensation equipment.

[0167] The present invention establishes a matching mechanism for evaluating the scale of renewable energy grid connection and the capacity of reactive power compensation equipment, which is beneficial for power system planners to analyze the reactive power demand of the system according to the scale of renewable energy grid connection and select appropriate reactive power compensation equipment as needed.

[0168] Embodiment 3:

[0169] Based on the same inventive concept, the present invention also provides a computer device, which includes a processor and a memory, wherein the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute 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 (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, and is specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding functions, so as to implement the steps of the method in the above embodiment.

[0170] Embodiment 4:

[0171] Based on the same inventive concept, the present invention also provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both a built-in storage medium in a computer device and an extended storage medium supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by a processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). 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 memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the steps of the method in the above embodiment.

[0172] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The schemes in the embodiments of the present invention may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0173] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0174] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0175] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0176] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0177] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for evaluating the ability of reactive power compensation equipment to increase the scale of new energy, characterized in that: include: Establish an analysis model for reactive power compensation equipment in power systems with a high proportion of renewable energy; Based on the analysis model, a coupling influence factor of the reactive compensation device is calculated; Based on the coupling influencing factors, the ability of reactive power compensation equipment to improve the scale of renewable energy grid connection is determined.

2. The method according to claim 1, characterized in that The analysis model is as follows: Among them, B is the analysis model, Q C is the maximum capacity of the reactive power compensation equipment, and U is the grid connection point voltage of the reactive power compensation equipment.

3. The method according to claim 1, characterized in that The calculated coupling influence factors of reactive power compensation equipment include: The reactive power impact factor of new energy considering the influence of reactive compensation equipment, the coupling impact factor of new energy units and reactive compensation equipment, and the coupling impact factor of high-proportion new energy power system and reactive compensation equipment.

4. The method according to claim 3, characterized in that The reactive power impact factor of new energy considering the impact of reactive power compensation equipment is calculated, and the calculation formula is as follows: γ=QBZ 2 Among them, γ is the reactive power influencing factor of new energy considering the influence of reactive compensation equipment, B is the analysis model, Q is the reactive power output by the new energy unit, and Z is the equivalent impedance of the system.

5. The method according to claim 3, characterized in that: The coupling influence factor between the new energy unit and the reactive compensation equipment is calculated, and the calculation formula is as follows: β=1-2BX+B 2 Z 2 Among them, β is the coupling influence factor between the new energy unit and the reactive compensation equipment, B is the analysis model, Z is the system equivalent impedance, and X is the system equivalent reactance.

6. The method according to claim 3, characterized in that The coupling influence factor between the high-proportion new energy power system and the reactive power compensation equipment is calculated, and the calculation formula is as follows: α=BZ 2 Among them, α is the coupling influence factor between the high-proportion new energy power system and the reactive compensation equipment, B is the analysis model, and Z is the system equivalent impedance.

7. The method according to claim 1, characterized in that The determining, based on the coupling influence factor, the ability of reactive power compensation equipment to improve the scale of new energy grid connection includes: Based on the coupling influence factors, a first new energy grid-connected scale calculation model considering the influence of reactive compensation equipment and a second new energy grid-connected scale calculation model not considering the influence of reactive compensation equipment are respectively established; Based on the first new energy grid-connected scale calculation model and the second new energy grid-connected scale calculation model, a reactive power compensation equipment capacity improvement model for the new energy grid-connected scale is established; Based on the improvement capacity model, the improvement capacity of the reactive power compensation equipment for the scale of new energy grid connection is calculated.

8. The method according to claim 7, characterized in that The calculation model of the first new energy grid-connected scale is as follows: Among them, P B is the scale of new energy grid connection after considering reactive compensation equipment, γ is the reactive influence factor of new energy considering the influence of reactive compensation equipment, β is the coupling influence factor between new energy units and reactive compensation equipment, α is the coupling influence factor between high-proportion new energy power system and reactive compensation equipment, Q is the reactive power output of new energy units, Z is the system equivalent impedance, R is the system equivalent resistance, X is the system equivalent reactance, and E is the system equivalent potential.

9. The method according to claim 7, characterized in that: The calculation model of the second new energy grid-connected scale is as follows: Among them, P R is the scale of new energy grid connection without considering the impact of reactive compensation equipment, Q is the reactive power output of the new energy unit, Z is the system equivalent impedance, R is the system equivalent resistance, X is the system equivalent reactance, and E is the system equivalent potential.

10. The method according to claim 7, characterized in that The improvement capability model is as follows: ΔP=P B -P R Among them, ΔP is the increase in the scale of new energy grid connection, P B To consider the scale of new energy grid connection after reactive power compensation equipment, P R It is the scale of new energy grid connection without considering the impact of reactive power compensation equipment.

11. A system for evaluating the ability of reactive power compensation equipment to increase the scale of new energy, characterized in that: include: The initial unit is used to establish an analytical model for reactive power compensation equipment in power systems with a high proportion of renewable energy; A calculation unit, used for calculating a coupling influence factor of a reactive compensation device based on the analysis model; An evaluation unit is used to determine the ability of reactive power compensation equipment to improve the scale of renewable energy grid connection based on the coupling influence factor.

12. The system according to claim 11, characterized in that The analysis model is as follows: Among them, B is the analysis model, Q C is the maximum capacity of the reactive power compensation equipment, and U is the grid connection point voltage of the reactive power compensation equipment.

13. The system according to claim 11, characterized in that The calculated coupling influence factors of reactive power compensation equipment include: The reactive power impact factor of new energy considering the influence of reactive compensation equipment, the coupling impact factor of new energy units and reactive compensation equipment, and the coupling impact factor of high-proportion new energy power system and reactive compensation equipment.

14. The system according to claim 13, characterized in that The reactive power impact factor of new energy considering the impact of reactive power compensation equipment is calculated, and the calculation formula is as follows: γ=QBZ 2 Among them, γ is the reactive power influencing factor of new energy considering the influence of reactive compensation equipment, B is the analysis model, Q is the reactive power output by the new energy unit, and Z is the equivalent impedance of the system.

15. The system according to claim 13, characterized in that The coupling influence factor between the new energy unit and the reactive compensation equipment is calculated, and the calculation formula is as follows: β=1-2BX+B 2 Z 2 Among them, β is the coupling influence factor between the new energy unit and the reactive compensation equipment, B is the analysis model, Z is the system equivalent impedance, and X is the system equivalent reactance.

16. The system according to claim 13, characterized in that The coupling influence factor between the high-proportion new energy power system and the reactive power compensation equipment is calculated, and the calculation formula is as follows: α=BZ 2 Among them, α is the coupling influence factor between the high-proportion new energy power system and the reactive compensation equipment, B is the analysis model, and Z is the system equivalent impedance.

17. The system according to claim 11, characterized in that The determining, based on the coupling influence factor, the ability of reactive power compensation equipment to improve the scale of new energy grid connection includes: Based on the coupling influence factors, a first new energy grid-connected scale calculation model considering the influence of reactive compensation equipment and a second new energy grid-connected scale calculation model not considering the influence of reactive compensation equipment are respectively established; Based on the first new energy grid-connected scale calculation model and the second new energy grid-connected scale calculation model, a reactive power compensation equipment capacity improvement model for the new energy grid-connected scale is established; Based on the improvement capacity model, the improvement capacity of the reactive power compensation equipment for the scale of new energy grid connection is calculated.

18. The system according to claim 17, characterized in that The calculation model of the first new energy grid-connected scale is as follows: Among them, P B is the scale of new energy grid connection after considering reactive compensation equipment, γ is the reactive influence factor of new energy considering the influence of reactive compensation equipment, β is the coupling influence factor between new energy units and reactive compensation equipment, α is the coupling influence factor between high-proportion new energy power system and reactive compensation equipment, Q is the reactive power output of new energy units, Z is the system equivalent impedance, R is the system equivalent resistance, X is the system equivalent reactance, and E is the system equivalent potential.

19. The system according to claim 17, characterized in that The calculation model of the second new energy grid-connected scale is as follows: Among them, P R is the scale of new energy grid connection without considering the impact of reactive compensation equipment, Q is the reactive power output of the new energy unit, Z is the system equivalent impedance, R is the system equivalent resistance, X is the system equivalent reactance, and E is the system equivalent potential.

20. The system according to claim 17, characterized in that The improvement capability model is as follows: ΔP=P B -P R Among them, ΔP is the increase in the scale of new energy grid connection, P B To consider the scale of new energy grid connection after reactive power compensation equipment, P R It is the scale of new energy grid connection without considering the impact of reactive power compensation equipment.

21. A computer device, characterized in that: include: one or more processors; a processor for executing one or more programs; When the one or more programs are executed by the one or more processors, the method according to any one of claims 1 to 10 is implemented.

22. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed, the method according to any one of claims 1 to 10 is implemented.

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