Comprehensive evaluation method and system for frequency voltage supporting capability of new energy station

Abstract

The invention discloses a comprehensive evaluation method and system for the frequency voltage supporting capability of a new energy station, and the method comprises the steps: determining an evaluation criterion according to the frequency voltage supporting characteristics of the new energy station; according to the evaluation criterion, establishing an evaluation index of the frequency voltage supporting capability of the new energy station; according to the actual measurement value and the simulation value of the new energy station, performing dimensionless processing on the evaluation index quantity to obtain an evaluation index quantized value; comparing the evaluation indexes in pairs by adopting an analytic hierarchy process, and constructing a difference matrix; obtaining a weight coefficient of the evaluation index by calculating a maximum characteristic value of the difference matrix and a corresponding characteristic vector; and substituting the evaluation index quantized value and the weight coefficient into a pre-constructed new energy station frequency voltage support capability evaluation model, and determining a new energy station frequency voltage support capability comprehensive score. The support capability of the new energy station can be accurately and rapidly evaluated, and the contribution of the new energy station to power grid frequency and voltage stability is quantitatively analyzed.

Description

Technical Field

[0001] The present invention relates to the technical field of power system stability control, and in particular to a comprehensive evaluation method and system for frequency and voltage support capabilities of new energy stations. Background Art

[0002] At present, all countries are vigorously developing new energy sources such as wind power and photovoltaics. The installed capacity of new energy sources continues to rise, and the penetration rate in the power grid continues to increase. However, new energy power generation has the characteristics of large output fluctuations and strong uncertainty. Its grid connection will cause the frequency and voltage fluctuations of the power grid to increase, weaken the transient stability margin of the power grid, and in severe cases may induce power system collapse accidents.

[0003] In order to ensure the safe and stable operation of the power grid under the high penetration rate of new energy, power grid companies have taken measures such as optimizing the site selection of new energy sites, configuring grid-friendly wind, solar and storage integrated devices, and installing primary frequency regulation facilities and reactive power compensation devices to improve the support capacity of new energy for the frequency and voltage of the power grid. However, there is currently a lack of comprehensive and quantitative evaluation methods for the frequency and voltage support capacity of new energy sites. Existing research focuses on the analysis of single performance indicators, such as inertial support capacity and primary frequency regulation capacity, and lacks a comprehensive evaluation method that takes into account multiple factors such as primary frequency regulation, secondary frequency regulation, reactive power support, and voltage support.

[0004] In actual engineering applications, there is an urgent need for an easy-to-operate and comprehensive evaluation method for the frequency and voltage support capacity of new energy stations, which can quantitatively describe the supporting role of different stations on the frequency and voltage stability of the power grid, identify weak links, and thus formulate targeted optimization measures to ensure the stability margin of the power grid and improve the new energy absorption capacity. Summary of the invention

[0005] In view of the above technical problems, the present invention provides a comprehensive evaluation method for the frequency and voltage support capability of a new energy station, comprising:

[0006] Determine evaluation criteria based on the frequency and voltage support characteristics of new energy stations; and establish evaluation indicators for the frequency and voltage support capabilities of new energy stations based on the evaluation criteria;

[0007] According to the measured value and simulation value of the new energy station, the evaluation index quantity is dimensionless processed to obtain the quantitative value of the evaluation index;

[0008] The evaluation indicators are compared pairwise by using the hierarchical analysis method to construct a difference matrix; the weight coefficients of the evaluation indicators are obtained by calculating the maximum eigenvalue and the corresponding eigenvector of the difference matrix;

[0009] The quantitative value and weight coefficient of the evaluation index are substituted into the pre-constructed frequency and voltage support capability evaluation model of the new energy station to determine the comprehensive score of the frequency and voltage support capability of the new energy station.

[0010] Furthermore, according to the frequency and voltage support characteristics of the new energy stations, the evaluation criteria are determined, including:

[0011] According to the frequency and voltage support characteristics of new energy stations, primary frequency regulation capability, secondary frequency regulation capability, reactive power regulation capability and dynamic voltage support capability are selected as evaluation criteria.

[0012] Furthermore, based on the evaluation criteria, the evaluation indicators for the frequency and voltage support capability of new energy stations are established, including:

[0013] Under the primary frequency regulation capability evaluation criteria, the frequency regulation response time, frequency regulation response depth, and frequency regulation accuracy evaluation indicators are set; under the secondary frequency regulation capability evaluation criteria, the AGC response time, regulation accuracy, and regulation rate evaluation indicators are set; under the reactive power regulation capability evaluation criteria, the reactive power response time, reactive power regulation range, and reactive power regulation rate evaluation indicators are set; under the dynamic voltage support capability evaluation criteria, the voltage regulation response time and voltage regulation depth evaluation indicators are set.

[0014] Furthermore, according to the measured values ​​and simulation values ​​of the new energy stations, the evaluation index quantities are dimensionless processed to obtain the quantitative values ​​of the evaluation indexes, including:

[0015] Obtain the measured operation data of new energy stations and extract the time series related to each evaluation index;

[0016] Preprocessing the measured data to remove abnormal values ​​and fill in missing values;

[0017] Based on the measured data, calculating the quantitative value of each evaluation index;

[0018] According to the simulation model of the new energy station, obtain simulation data;

[0019] Performing quantitative calculation of evaluation indicators on the simulation data to obtain theoretical values ​​of each evaluation indicator under different working conditions;

[0020] According to the quantitative value and the theoretical value, the evaluation index is dimensionally processed to obtain the quantitative value of the evaluation index.

[0021] Furthermore, after the step of obtaining the weight coefficient of the evaluation index, the method further includes:

[0022] The weighted geometric mean method is used to obtain the final weight of each evaluation index.

[0023] Furthermore, the quantitative value and weight coefficient of the evaluation index are substituted into the pre-constructed frequency and voltage support capacity evaluation model of the new energy station to determine the comprehensive score of the frequency and voltage support capacity of the new energy station, including:

[0024] Construct a frequency and voltage support capacity evaluation model for new energy stations, and set a mathematical relationship between the quantitative value of the evaluation index and the weight coefficient;

[0025] Substitute the quantitative value and weight coefficient of each indicator into the model, perform weighted synthesis, and obtain the comprehensive frequency and voltage support capability score of the new energy station.

[0026] Furthermore, it also includes: determining the support capacity level of the new energy station according to a preset scoring level classification standard.

[0027] Furthermore, it also includes: for sites with unqualified support capability levels, identifying weak links and developing targeted optimization strategies;

[0028] Use the evaluation results to guide the site selection and planning of new energy stations, and the configuration of reactive power compensation devices and primary frequency regulation devices;

[0029] Establish a power grid risk early warning mechanism based on the evaluation of the support capacity of new energy sites and dynamically evaluate the stability margin of the power grid;

[0030] Integrate the evaluation results of new energy station support capabilities to optimize the grid dispatching and operation mode.

[0031] The present invention also provides a comprehensive evaluation system for the frequency and voltage support capability of a new energy station, including:

[0032] An evaluation index establishment module is used to determine the evaluation criteria according to the frequency and voltage support characteristics of the new energy station; and to establish the evaluation index of the frequency and voltage support capability of the new energy station according to the evaluation criteria;

[0033] An index quantification module is used to perform dimensionless processing on the evaluation index quantity according to the measured value and simulation value of the new energy station to obtain the evaluation index quantization value;

[0034] A weight coefficient obtaining module is used to compare the evaluation indicators in pairs by using a hierarchical analysis method to construct a difference matrix; and obtain the weight coefficient of the evaluation indicator by calculating the maximum eigenvalue and the corresponding eigenvector of the difference matrix;

[0035] The evaluation module is used to substitute the quantitative value and weight coefficient of the evaluation index into a pre-constructed frequency and voltage support capability evaluation model of a new energy station to determine a comprehensive score of the frequency and voltage support capability of the new energy station.

[0036] Furthermore, it also includes:

[0037] The support capability level determination module is used to determine the support capability level of the new energy station according to the preset scoring level classification standard.

[0038] The comprehensive evaluation method for the frequency and voltage support capacity of new energy stations proposed in this invention can accurately and quickly evaluate the support capacity of new energy stations and quantitatively analyze their contribution to the frequency and voltage stability of the power grid. The evaluation results can be used to guide power grid planning and construction, optimize operation control, and warn of risks and hidden dangers, and comprehensively improve the frequency and voltage stability level of new power systems with new energy as the main body3. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a flow chart of a comprehensive evaluation method for frequency and voltage support capability of a new energy station provided by an embodiment of the present invention;

[0040] Figure 2 It is an overall block diagram of a comprehensive evaluation method for frequency and voltage support capability of a new energy station involved in an embodiment of the present invention;

[0041] Figure 3 It is a structural diagram of a comprehensive evaluation system for frequency and voltage support capabilities of new energy stations provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited to the specific implementation disclosed below.

[0043] Example 1

[0044] Figure 1 This is a flowchart of a comprehensive evaluation method for the frequency and voltage support capability of a new energy station provided by an embodiment of the present invention. Figure 1 The method provided by the present invention is described in detail, and the method comprises the following steps:

[0045] Step S101, determining an evaluation criterion according to the frequency and voltage support characteristics of the new energy station; and establishing an evaluation index for the frequency and voltage support capability of the new energy station according to the evaluation criterion.

[0046] According to the frequency and voltage support characteristics of new energy stations, primary frequency regulation capability, secondary frequency regulation capability, reactive power regulation capability and dynamic voltage support capability are selected as evaluation criteria.

[0047] Under the primary frequency regulation capability evaluation criteria, the frequency regulation response time, frequency regulation response depth, and frequency regulation accuracy evaluation indicators are set; under the secondary frequency regulation capability evaluation criteria, the AGC response time, regulation accuracy, and regulation rate evaluation indicators are set; under the reactive power regulation capability evaluation criteria, the reactive power response time, reactive power regulation range, and reactive power regulation rate evaluation indicators are set; under the dynamic voltage support capability evaluation criteria, the voltage regulation response time and voltage regulation depth evaluation indicators are set.

[0048] Step S102: performing dimensionless processing on the evaluation index quantity according to the measured value and the simulation value of the new energy station to obtain a quantitative value of the evaluation index.

[0049] Obtain the measured operation data of new energy stations and extract the time series related to each evaluation index;

[0050] Preprocessing the measured data to remove abnormal values ​​and fill in missing values;

[0051] Based on the measured data, calculating the quantitative value of each evaluation index;

[0052] According to the simulation model of the new energy station, obtain simulation data;

[0053] Performing quantitative calculation of evaluation indicators on the simulation data to obtain theoretical values ​​of each evaluation indicator under different working conditions;

[0054] According to the quantitative value and the theoretical value, the evaluation index is dimensionally processed to obtain the quantitative value of the evaluation index.

[0055] Step S103, using the hierarchical analysis method to compare the evaluation indicators in pairs and construct a difference matrix; by calculating the maximum eigenvalue and the corresponding eigenvector of the difference matrix, the weight coefficient of the evaluation indicator is obtained.

[0056] By inviting power system experts, we can use the hierarchical analysis method to compare the evaluation indicators in pairs and construct a judgment matrix. We can perform consistency checks on the judgment matrix to ensure the logic of the expert judgment. We can calculate the maximum eigenvalue and corresponding eigenvector of the judgment matrix and normalize them to obtain the weight coefficient of the indicator. We can use the weighted geometric mean method to combine the judgment results of multiple experts to obtain the final weight of each indicator.

[0057] Step S104, substituting the quantified value of the evaluation index and the weight coefficient into a pre-constructed new energy station frequency and voltage support capability evaluation model to determine a comprehensive score of the new energy station frequency and voltage support capability.

[0058] Construct a frequency and voltage support capacity evaluation model for new energy stations, and set a mathematical relationship between the quantitative value of the evaluation index and the weight coefficient;

[0059] Substitute the quantitative value and weight coefficient of each indicator into the model, perform weighted synthesis, and obtain the comprehensive frequency and voltage support capability score of the new energy station.

[0060] Determine the support capacity level of the new energy station based on the preset scoring standards.

[0061] For sites with unqualified support capability levels, identify weak links and develop targeted optimization strategies;

[0062] Use the evaluation results to guide the site selection and planning of new energy stations, and the configuration of reactive power compensation devices and primary frequency regulation devices;

[0063] Establish a power grid risk early warning mechanism based on the evaluation of the support capacity of new energy sites and dynamically evaluate the stability margin of the power grid;

[0064] Integrate the evaluation results of new energy station support capabilities to optimize the grid dispatching and operation mode.

[0065] Example 2

[0066] Taking a local power grid dominated by renewable energy in a certain region as an example, there are 4 renewable energy sites in the grid, including 2 wind farms and 2 photovoltaic power stations, with a total installed capacity of 1000MW, accounting for 50% of the total installed capacity of the grid. In order to objectively evaluate the support capacity of each renewable energy site for the grid frequency and voltage, the method of the present invention is used to carry out a comprehensive evaluation.

[0067] Step 1: Construct an evaluation index system.

[0068] According to the frequency and voltage support characteristics of new energy stations, an evaluation index system is constructed in two levels. The criterion layer includes four aspects: primary frequency regulation capability, secondary frequency regulation capability, reactive power regulation capability, and dynamic voltage support capability; the index layer sets three indicators: frequency regulation response time, frequency regulation response depth, and frequency regulation accuracy under the primary frequency regulation capability criterion, sets three indicators: AGC response time, regulation accuracy, and regulation rate under the secondary frequency regulation capability criterion, sets three indicators: reactive power response time, reactive power regulation range, and reactive power regulation rate under the reactive power regulation capability criterion, and sets two indicators: voltage regulation response time and voltage regulation depth under the dynamic voltage support capability criterion.

[0069] Step 2: Calculate the evaluation index value.

[0070] The measured data of the operation of four new energy stations were collected continuously for one month, and the time series related to each evaluation index were extracted. Through data preprocessing and statistical analysis, the quantitative values ​​of each index supported by the measured data were calculated. At the same time, a fine simulation model of the local power grid and new energy station was built, and typical working conditions were designed to carry out simulation analysis to obtain the simulation theoretical values ​​of the evaluation index. The measured values ​​and simulation values ​​of the indicators were combined to obtain the quantified indicator values, and dimensionless processing was performed.

[0071] Step 3: Determine the indicator weight coefficient.

[0072] The hierarchical analysis method is used to compare the evaluation indicators in pairs, build a judgment matrix and conduct consistency test. The judgment results of multiple experts are geometrically averaged, the weight of the criterion layer indicators to the target layer, and the weight of the indicator layer to the criterion layer are calculated, and the hierarchical total ranking and test are carried out to finally determine the weight coefficient of each evaluation indicator.

[0073] Step 4: Comprehensive evaluation and calculation.

[0074] A weighted comprehensive evaluation model was established, and the quantitative values ​​and weight coefficients of each indicator were substituted into the model. Through weighted summation, the comprehensive frequency and voltage support capacity scores of the four new energy stations were obtained, which were 88 points, 92 points, 85 points and 90 points respectively. The grading standards of 85 points or above were set as excellent, 70-85 points as good, 60-70 points as qualified, and below 60 points as unqualified, and it was determined that the support capacity levels of the four new energy stations were all excellent.

[0075] Step 5: Analyze the application.

[0076] For the two new energy stations with relatively low evaluation scores, we conducted an in-depth analysis of their shortcomings in indicators such as primary frequency regulation response time and reactive power regulation rate, and put forward targeted optimization countermeasures and suggestions, such as reasonable configuration of energy storage systems and optimization of parameter settings of reactive power compensation devices such as SVG. According to the support capacity level evaluation of the four new energy stations, the feasibility of the new energy access plan was demonstrated, and the site selection and grid connection design of the subsequent expansion of new energy stations were guided. At the same time, the support capacity evaluation results were used to optimize the grid dispatching and operation strategy, and give full play to the role of new energy in supporting the stability of the grid.

[0077] Through the above process, the comprehensive support capacity evaluation of the four new energy stations in the local power grid was completed. The evaluation results accurately reflected the contribution of each station to the stability of the power grid frequency and voltage. Through comparative analysis, the weak links were found, which provided an important basis for improving the support capacity of the station and optimizing the power grid operation control strategy, and achieved good application results. In the future, the method of the present invention can be promoted and applied on a larger scale to support the construction of a new energy station support capacity evaluation system covering the entire network, and to help the high-quality development of new energy and the transformation and upgrading of energy and electricity.

[0078] Figure 1 and Figure 2The key components and implementation process of the comprehensive evaluation method for the frequency and voltage support capability of new energy stations of the present invention are intuitively demonstrated from the two perspectives of the overall framework and process steps, which helps to understand the core content and innovation of the invention. The boxes in the figure represent the key steps of the evaluation process, and the arrows represent the logical relationship and process sequence between the steps. By comprehensively using methods such as measured data analysis, simulation analysis, hierarchical analysis method, and weighted comprehensive evaluation model, a graded judgment on the comprehensive support capability of new energy stations is finally formed. The evaluation results can be widely used in power grid planning, optimal configuration of new energy, and power grid dispatching and operation.

[0079] Example 3

[0080] Based on the same inventive concept, the present invention also provides a comprehensive evaluation system 300 for the frequency and voltage support capability of a new energy station, such as Figure 3 As shown, including:

[0081] An evaluation index establishment module 310 is used to determine an evaluation criterion according to the frequency and voltage support characteristics of the new energy station; and to establish an evaluation index of the frequency and voltage support capability of the new energy station according to the evaluation criterion;

[0082] The index quantization module 320 is used to perform dimensionless processing on the evaluation index quantity according to the measured value and the simulation value of the new energy station to obtain the evaluation index quantization value;

[0083] The weight coefficient obtaining module 330 is used to compare the evaluation indicators in pairs by using the hierarchical analysis method to construct a difference matrix; and obtain the weight coefficient of the evaluation indicator by calculating the maximum eigenvalue and the corresponding eigenvector of the difference matrix;

[0084] The evaluation module 340 is used to substitute the quantitative value and weight coefficient of the evaluation index into a pre-constructed new energy station frequency and voltage support capability evaluation model to determine the comprehensive score of the new energy station frequency and voltage support capability.

[0085] Furthermore, it also includes:

[0086] The support capability level determination module is used to determine the support capability level of the new energy station according to the preset scoring level classification standard.

[0087] The present invention provides a comprehensive evaluation method and system for the frequency and voltage support capability of a new energy station, which has the following effects:

[0088] 1. A comprehensive and systematic evaluation index system has been constructed, covering multiple aspects such as primary frequency regulation, secondary frequency regulation, reactive power support, voltage support, etc., and key indicators such as frequency regulation response speed, frequency regulation response depth, AGC response time, reactive power regulation rate, and voltage regulation depth have been selected to form a multi-level and multi-dimensional index framework. Compared with existing research, the index system of the present invention is more complete, which can fully reflect the comprehensive support capabilities of new energy stations and lay a solid foundation for accurate evaluation.

[0089] 2. Innovatively adopt a quantitative evaluation method that combines measured data analysis and simulation analysis to overcome the limitations of a single analysis method. By analyzing the measured data of new energy stations, the actual dynamic characteristics of the equipment can be mastered; by simulating new energy station models, a variety of typical working conditions can be simulated to analyze theoretical support capabilities. On the basis of comprehensive consideration of measured values ​​and simulation values, a quantitative description of the evaluation indicators is formed, which greatly improves the objectivity and accuracy of the support capability evaluation.

[0090] 3. Introduce the analytic hierarchy process, scientifically determine the indicator weights, construct a weighted comprehensive evaluation mathematical model, and quantitatively integrate the information of each evaluation indicator. The quantitative value of the indicator and the weight coefficient are weighted and summed to obtain the comprehensive support capacity score of the new energy station, and then give a grade judgment. This method quantitatively describes the contribution of each indicator to the comprehensive support capacity, and the evaluation results are more reasonable and credible, providing a solid foundation for subsequent analysis and application.

[0091] 4. The evaluation results can provide extensive guidance for grid planning and operation optimization. By identifying weak links, we can formulate optimization strategies to enhance the support capacity of new energy stations according to local conditions, such as rationally allocating primary frequency regulation and energy storage resources, optimizing the parameters of reactive compensation devices such as SVG, etc. The evaluation results can serve as an important basis for the comparison and demonstration of new energy access solutions, and guide the site selection and layout of new energy stations. In addition, the evaluation results can be used to optimize the grid dispatching and operation strategies, maximize the benefits of new energy under the condition of high penetration of new energy, and enhance the grid's ability to absorb new energy.

[0092] 5. Support the establishment of a risk warning mechanism for power grids, dynamically evaluate the stability margin of power grids, quantitatively analyze the extent to which power grids are impacted by risks, and take targeted prevention and control measures in advance. Using the assessment results of the support capacity of new energy sites, collaboratively improve the resilience of the power grid from multiple levels, such as the new energy access side and the power grid operation side, to prevent problems before they occur, ensure the safe and stable operation of the power system, and safeguard the high-quality development of new energy.

[0093] 6. The present invention is simple to operate, highly reproducible, and easy to promote and apply in engineering practice. The required evaluation index data can be directly collected or indirectly calculated, the evaluation process is clear and definite, and the professional requirements for engineering and technical personnel are not high. The method can be widely used in new energy stations of different types and sizes to evaluate their comprehensive support capabilities, analyze and compare the support effects of different stations, and promote the formation of evaluation standards and specifications.

[0094] In summary, the comprehensive evaluation method for the frequency and voltage support capacity of new energy stations proposed in this invention can accurately and quickly evaluate the support capacity of new energy stations and quantitatively analyze their contribution to the frequency and voltage stability of the power grid. The evaluation results can be used to guide power grid planning and construction, optimize operation control, and warn of risks and hidden dangers, comprehensively improve the frequency and voltage stability level of new power systems with new energy as the main body, ensure the safe and friendly grid connection of large-scale new energy under the background of "double highs", and promote the clean and low-carbon transformation of energy and electricity, which has broad application prospects and significant social benefits.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalents that do not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A comprehensive evaluation method for the frequency and voltage support capability of a new energy station, characterized in that: include: Determine the evaluation criteria based on the frequency and voltage support characteristics of new energy stations; According to the evaluation criteria, establish evaluation indicators for the frequency and voltage support capabilities of new energy stations; According to the measured value and simulation value of the new energy station, the evaluation index quantity is dimensionless processed to obtain the quantitative value of the evaluation index; The evaluation indicators are compared pairwise by using the hierarchical analysis method to construct a difference matrix; the weight coefficients of the evaluation indicators are obtained by calculating the maximum eigenvalue and the corresponding eigenvector of the difference matrix; The quantitative value and weight coefficient of the evaluation index are substituted into the pre-constructed frequency and voltage support capability evaluation model of the new energy station to determine the comprehensive score of the frequency and voltage support capability of the new energy station.

2. The method according to claim 1, characterized in that: According to the frequency and voltage support characteristics of new energy stations, the evaluation criteria are determined, including: According to the frequency and voltage support characteristics of new energy stations, primary frequency regulation capability, secondary frequency regulation capability, reactive power regulation capability and dynamic voltage support capability are selected as evaluation criteria.

3. The method according to claim 1, characterized in that According to the evaluation criteria, the evaluation indicators of the frequency and voltage support capacity of new energy stations are established, including: Under the primary frequency regulation capability evaluation criteria, the frequency regulation response time, frequency regulation response depth, and frequency regulation accuracy evaluation indicators are set; under the secondary frequency regulation capability evaluation criteria, the AGC response time, regulation accuracy, and regulation rate evaluation indicators are set; under the reactive power regulation capability evaluation criteria, the reactive power response time, reactive power regulation range, and reactive power regulation rate evaluation indicators are set; under the dynamic voltage support capability evaluation criteria, the voltage regulation response time and voltage regulation depth evaluation indicators are set.

4. The method according to claim 1, characterized in that: According to the measured values ​​and simulation values ​​of the new energy stations, the evaluation index quantities are dimensionless processed to obtain the quantitative values ​​of the evaluation indexes, including: Obtain the measured operation data of new energy stations and extract the time series related to each evaluation index; Preprocessing the measured data to remove abnormal values ​​and fill in missing values; Based on the measured data, calculating the quantitative value of each evaluation index; According to the simulation model of the new energy station, obtain simulation data; Performing quantitative calculation of evaluation indicators on the simulation data to obtain theoretical values ​​of each evaluation indicator under different working conditions; According to the quantitative value and the theoretical value, the evaluation index is dimensionally processed to obtain the quantitative value of the evaluation index.

5. The method according to claim 1, characterized in that After the step of obtaining the weight coefficient of the evaluation index, the method further includes: The weighted geometric mean method is used to obtain the final weight of each evaluation index.

6. The method according to claim 1, characterized in that Substitute the quantitative values ​​and weight coefficients of the evaluation indicators into the pre-built frequency and voltage support capacity evaluation model of the new energy station to determine the comprehensive score of the frequency and voltage support capacity of the new energy station, including: Construct a frequency and voltage support capacity evaluation model for new energy stations, and set a mathematical relationship between the quantitative value of the evaluation index and the weight coefficient; Substitute the quantitative value and weight coefficient of each indicator into the model, perform weighted synthesis, and obtain the comprehensive frequency and voltage support capability score of the new energy station.

7. The method according to claim 6, characterized in that Also includes: Determine the support capacity level of the new energy station based on the preset scoring standards.

8. The method according to claim 7, characterized in that Also includes: For sites with unqualified support capability levels, identify weak links and develop targeted optimization strategies; Use the evaluation results to guide the site selection and planning of new energy stations, and the configuration of reactive power compensation devices and primary frequency regulation devices; Establish a power grid risk early warning mechanism based on the evaluation of the support capacity of new energy sites and dynamically evaluate the stability margin of the power grid; Integrate the evaluation results of new energy station support capabilities to optimize the grid dispatching and operation mode.

9. A comprehensive evaluation system for the frequency and voltage support capability of new energy stations, characterized in that: include: Evaluation index establishment module, used to determine the evaluation criteria according to the frequency and voltage support characteristics of new energy stations; According to the evaluation criteria, establish evaluation indicators for the frequency and voltage support capabilities of new energy stations; An index quantification module is used to perform dimensionless processing on the evaluation index quantity according to the measured value and simulation value of the new energy station to obtain the evaluation index quantization value; A weight coefficient obtaining module is used to compare the evaluation indicators in pairs by using a hierarchical analysis method to construct a difference matrix; and obtain the weight coefficient of the evaluation indicator by calculating the maximum eigenvalue and the corresponding eigenvector of the difference matrix; The evaluation module is used to substitute the quantitative value and weight coefficient of the evaluation index into a pre-constructed frequency and voltage support capability evaluation model of a new energy station to determine a comprehensive score of the frequency and voltage support capability of the new energy station.

10. The system according to claim 9, characterized in that Also includes: The support capability level determination module is used to determine the support capability level of the new energy station according to the preset scoring level classification standard.

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