Diversified load consumption capability assessment method for power distribution network

Abstract

The invention belongs to the technical field of power distribution network safety control and the technical field of data processing, and discloses a power distribution network diversified load consumption capability evaluation method. The evaluation method comprises the following specific steps: S1, obtaining basic data of a regional power grid; S2, drawing up a diversified load initial access scheme; S3, dividing the regional power grid into layers and components; S4, establishing a rationality evaluation index system; and a diversified load access scheme is judged and optimized. According to the method, the basic data of the regional power grid is systematically collected and processed, the accuracy and reliability of evaluation are ensured, diversified load access schemes are designed and evaluated, the influence of different load types on the regional power grid is comprehensively considered, and load optimal configuration and stable operation of the power grid are realized.

Description

Technical Field

[0001] The present invention belongs to the technical field of power distribution network safety control and data processing, and specifically relates to a method for evaluating the diversified load accommodating capacity of a power distribution network. Background Art

[0002] The evaluation of the diversified load absorption capacity of the distribution network is a systematic method and technical platform that collects and analyzes the basic data, load characteristics, grid structure and other information of the distribution network, and uses mathematical modeling, simulation analysis and other means to conduct a comprehensive evaluation of the distribution network's operating status, load carrying capacity, economy, environmental protection and other aspects after the diversified loads are connected.

[0003] Traditional load assessment methods face multiple challenges: their fixed load growth patterns fail to capture the uncertainty and diversity of actual load changes, ignore seasonal fluctuations and the impact of large users, resulting in assessments that deviate from reality. At the same time, these methods often ignore the dynamic adjustment potential of the grid structure, such as network reconstruction and equipment upgrades, and underestimate the flexibility and adaptability of the grid. The use of a single assessment model is also difficult to fully cope with the complexity and uncertainty of diversified load access, affecting the comprehensiveness and accuracy of the assessment. In addition, the lack of real-time and dynamic features makes it impossible for the assessment results to keep up with changes in the actual operating status of the grid. Furthermore, the assessment indicators are not comprehensive, and fail to comprehensively consider multi-dimensional impacts such as economy and environmental protection, limiting the comprehensive assessment of the comprehensive performance of the grid. Summary of the invention

[0004] The purpose of the present invention is to provide a method for evaluating the diversified load accommodating capacity of a distribution network to solve the problems raised in the above-mentioned background technology.

[0005] In order to achieve the above object, the present invention provides the following technical solution: a method for evaluating the diversified load accommodating capacity of a distribution network, the specific steps of the evaluation method are as follows:

[0006] S1: Obtain basic data of regional power grid: Collect comprehensive basic data of regional power grid to ensure accurate and well-founded assessment;

[0007] S2: Develop an initial access plan for diversified loads: Design an access plan and assess its impact, and then divide the regional power grid into layers and components;

[0008] S3: Divide the regional power grid into layers and components: The regional power grid is divided into layers according to structural functions, and the components are subdivided into transformers, lines, and switches;

[0009] S4: Establish a rationality evaluation index system: Design regional power grid evaluation indicators, including stability, economy and environmental protection, and set scoring standards and weights;

[0010] S5: Build a calculation model and obtain regional power grid operation data: The model is built to simulate the operation of the regional power grid and evaluate the impact of load access on voltage and current parameters;

[0011] S6: Calculate the rationality score and evaluate the effect of diversified load access: The score calculation evaluates the rationality of load access, analyzes the effect, and clarifies the positive and negative impacts;

[0012] S7: Determine and optimize diversified load access plans: Determine and optimize load access plans, iterate to the maximum absorption capacity, and ensure efficient operation of the regional power grid.

[0013] Preferably, the specific steps of obtaining regional power grid basic data in S1 are as follows:

[0014] Step 1: Data collection and collation: First, collect basic data of the regional power grid from power companies, power grid dispatch centers and data monitoring station authorities. The basic data includes power grid structure diagrams, equipment technical parameters, historical load data and renewable energy power generation data;

[0015] Step 2: Data cleaning: After arranging the basic data, data cleaning is performed to identify and correct errors, outliers, and missing values ​​in the data. By writing scripts or using data processing software, errors in the data can be automatically checked and corrected, such as inconsistent formats and abnormal value ranges. At the same time, missing basic data needs to be filled or deleted according to the actual situation.

[0016] Step 3: Data verification and validation: After data cleaning is completed, data verification and validation are carried out to ensure that the cleaned data is accurate and meets the needs of subsequent analysis. The verification work includes comparing the data before and after cleaning to check whether there are omissions or errors in processing. At the same time, the accuracy and reliability of the data are verified through simulation calculations or comparison with other reliable data sources.

[0017] Preferably, the diversified load initial access plan proposed in S2 is based on detailed regional power grid basic data and accurate load forecasting, and a diversified load access plan is designed, covering multiple types of wind power, photovoltaics, and electric vehicles, and the access location, appropriate capacity and access timing of each load are clarified. Subsequently, through preliminary evaluation, the impact of the plan on the voltage stability and power flow distribution of the power grid is deeply analyzed.

[0018] Preferably, the layered and component-based division of the regional power grid in S3 refers to dividing the power grid into multiple levels, including a transmission layer and a distribution layer, according to the complex structure and functional characteristics of the power grid, clarifying the responsibilities and relationships between the levels, and then, within each level, further refining the power grid into specific power components such as transformers, lines, and switches, ensuring that the function and status of each component can be accurately grasped and managed, providing a solid foundation for the efficient operation and optimization of the regional power grid.

[0019] Preferably, the specific steps of establishing the rationality evaluation index system in S4 are as follows:

[0020] Step 1: Demand analysis and goal setting: First, clarify the main needs and goals of grid operation, such as ensuring voltage stability, optimizing power flow distribution, improving economic benefits and promoting environmental protection;

[0021] Step 2: Evaluation index design: For each evaluation index category, design specific and quantifiable indicators, such as voltage stability indicators including voltage deviation rate and voltage fluctuation rate, and power flow distribution indicators involving line load rate and power flow balance;

[0022] Step 3: Scoring criteria and weight setting: Set scoring criteria for each evaluation indicator, and clarify the level of the indicator to obtain the corresponding score. The scoring criteria should take into account the actual situation and industry standards to ensure fairness and rationality. At the same time, assign corresponding weights according to the importance of each indicator to the operation of the regional power grid.

[0023] The entropy weight method is used to set the weights, and the entropy weight method formula is:

[0024]

[0025] Among them, m is the number of evaluation objects, n is the number of indicators, and p ij It is the normalized value of the i-th evaluation object on the j-th indicator.

[0026] Preferably, the specific steps of building a calculation model and obtaining regional power grid operation data in S5 are as follows:

[0027] Step 1: Model construction: First, according to the hierarchical and component-based regional power grid structure, a detailed physical model of the regional power grid is constructed, including defining the connection relationship between each level, as well as the specific parameters and properties of the power components within each level;

[0028] Step 2: Algorithm selection and implementation: Select appropriate regional power grid operation calculation algorithms, such as power flow calculation and stability analysis, and integrate them into the model;

[0029] The power flow calculation formula is as follows:

[0030] Complex power: S = P + jQ, where P is active power and Q is reactive power;

[0031] Voltage and current relationship: In power systems, the relationship between voltage and current can be described by an impedance or admittance matrix;

[0032] Node power balance equation: This is the basic equation for power flow calculation, which describes the nonlinear relationship between node voltage and power. For any node, its node power balance equation can be written as:

[0033]

[0034] Where P i and Q i are the active power and reactive power injected into node i, respectively; U ˙i and U ˙k are the voltage phasors of nodes i and k, respectively; and Y ˙ik* is the conjugate transposed element of the node admittance matrix;

[0035] The steps of power flow calculation are as follows:

[0036] Data preparation: Collect the connection mode of the power grid, the parameters of each component (such as line resistance, reactance, transformer ratio and impedance), and operating conditions (such as active power and reactive power of each load point and power source point);

[0037] Establishing mathematical model: According to the wiring mode and parameters of the power grid, a mathematical model of the power network is established, which usually includes node voltage equations or loop current equations;

[0038] Select calculation method: According to the scale and complexity of the power grid, select the appropriate power flow calculation method, such as Newton-Raphson method and PQ decomposition method; Write calculation program: According to the selected calculation method, write the corresponding calculation program, which needs to be able to handle the topology, parameters and operating conditions of the power grid and perform iterative calculations;

[0039] Execute calculation: Run the calculation program, input the connection mode, parameters and operating condition data of the power grid, and perform power flow calculation. During the calculation process, the program will continuously iterate and update the node voltage and power parameters until the convergence conditions are met;

[0040] Result analysis: Analyze the calculation results to check whether the voltage of each node meets the requirements and whether the power of each branch exceeds the limit. If problems are found, adjust the wiring mode, parameters or operating conditions of the power grid according to the actual situation and recalculate the power flow;

[0041] Step 3: Data simulation and result acquisition: Use the constructed power grid operation calculation model to perform data simulation in multiple scenarios. By adjusting the parameters in the load access plan, simulate the operating status of the regional power grid under different conditions.

[0042] Preferably, calculating the rationality score and evaluating the effect of diversified load access in S6 refers to performing a detailed scoring calculation on the regional power grid operation data based on the rationality evaluation index system, and obtaining a rationality score after diversified load access. By deeply analyzing the scoring results, a comprehensive evaluation is made of the multiple impacts of diversified load access on the regional power grid, including improving energy efficiency and promoting the positive effects of renewable energy consumption, as well as identifying potential negative challenges to the stability, economy and environmental protection of the regional power grid, providing a key reference for subsequent solution optimization.

[0043] Preferably, the specific steps of determining and optimizing the diversified load access scheme in S7 are as follows:

[0044] Step 1: Solution judgment: First, based on the rationality score and effect evaluation results, conduct a comprehensive review of the current diversified load access solution, compare the score with the preset threshold or the historical optimal solution, and consider the trade-off between positive and negative effects;

[0045] Step 2: Scheme optimization: If the current scheme is not the maximum absorption capacity scheme, it will enter the optimization stage. According to the key problems identified in the effect evaluation, such as limited regional power grid stability, poor economic performance or failure to meet environmental protection indicators, the load access location, capacity or timing will be adjusted in a targeted manner;

[0046] Step 3: Iteration: After completing an optimization, re-simulate the regional power grid operation, obtain new operation data, and perform score calculation and effect evaluation again. Compare the new score value with the previous result, and analyze the effectiveness of the optimization measures. If the score value is improved and the negative effect is alleviated, it means that the optimization direction is correct and you can continue to optimize. Otherwise, you need to review the optimization strategy and adjust the optimization direction. By repeating the iterative process from S5 to S7, you can gradually approach the access plan with the maximum absorption capacity until you find the best plan that meets the regional power grid operation needs and goals.

[0047] The beneficial effects of the present invention are as follows:

[0048] The present invention ensures the accuracy and reliability of the evaluation by systematically collecting and processing the basic data of the regional power grid. The method designs and evaluates diversified load access schemes, comprehensively considers the impact of different load types on the power grid, realizes load optimization configuration and stable operation of the power grid, divides the power grid by layers and components, and makes the evaluation process detailed and comprehensive, reflecting the actual operation status of the regional power grid. A scientific and reasonable evaluation index system and scoring standards are established to provide a quantitative basis for the evaluation and ensure that the results are objective and comparable. The power grid operation is simulated with the help of a calculation model to intuitively display the status of the regional power grid under different load access schemes, providing a scientific basis for optimizing the access scheme. At the same time, the positive and negative effects of diversified load access are comprehensively evaluated to maximize the comprehensive benefits. Through cyclic iterative optimization, the maximum absorption capacity scheme is gradually approached, the absorption capacity and flexibility of the power grid for diversified loads are improved, and a solid foundation is laid for the sustainable development of the regional power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 It is a schematic diagram of the overall process of the present invention. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] like Figure 1 As shown, an embodiment of the present invention provides a method for evaluating the diversified load absorbing capacity of a distribution network, and the specific steps of the evaluation method are as follows:

[0052] S1: Obtain basic data of regional power grid: Collect comprehensive basic data of regional power grid to ensure accurate and well-founded assessment;

[0053] S2: Develop an initial access plan for diversified loads: Design an access plan and assess its impact, and then divide the regional power grid into layers and components;

[0054] S3: Divide the regional power grid into layers and components: The regional power grid is divided into layers according to structural functions, and the components are subdivided into transformers, lines, and switches;

[0055] S4: Establish a rationality evaluation index system: Design regional power grid evaluation indicators, including stability, economy and environmental protection, and set scoring standards and weights;

[0056] S5: Build a calculation model and obtain regional power grid operation data: The model is built to simulate the operation of the regional power grid and evaluate the impact of load access on voltage and current parameters;

[0057] S6: Calculate the rationality score and evaluate the effect of diversified load access: The score calculation evaluates the rationality of load access, analyzes the effect, and clarifies the positive and negative impacts;

[0058] S7: Determine and optimize diversified load access plans: Determine and optimize load access plans, iterate to the maximum absorption capacity, and ensure efficient operation of the regional power grid.

[0059] The specific steps of obtaining the basic data of the regional power grid in S1 are as follows:

[0060] Step 1: Data collection and collation: First, collect basic data of the regional power grid from power companies, power grid dispatch centers and data monitoring station authorities. The basic data includes power grid structure diagrams, equipment technical parameters, historical load data and renewable energy power generation data;

[0061] Step 2: Data cleaning: After arranging the basic data, data cleaning is performed to identify and correct errors, outliers, and missing values ​​in the data. By writing scripts or using data processing software, errors in the data can be automatically checked and corrected, such as inconsistent formats and abnormal value ranges. At the same time, missing basic data needs to be filled or deleted according to the actual situation.

[0062] Step 3: Data verification and validation: After data cleaning is completed, data verification and validation are carried out to ensure that the cleaned data is accurate and meets the needs of subsequent analysis. The verification work includes comparing the data before and after cleaning to check whether there are omissions or errors in processing. At the same time, the accuracy and reliability of the data are verified through simulation calculations or comparison with other reliable data sources.

[0063] Data collection, cleaning and verification are the basis of power grid planning. Through rigorous data processing procedures, the accuracy, completeness and reliability of basic power grid data are ensured, providing solid support for the subsequent design and evaluation of load access solutions. This process improves the scientific nature of decision-making, ensures the effective implementation of power grid planning, and promotes the efficient and stable operation of the energy system.

[0064] Among them, the initial access plan for diversified loads proposed in S2 is based on detailed basic grid data and accurate load forecasting. A diversified load access plan is designed, covering various types such as wind power, photovoltaics, electric vehicles, etc., and the access location, appropriate capacity and access timing of each load are clarified. Subsequently, through preliminary evaluation, the impact of the plan on grid voltage stability and power flow distribution is deeply analyzed to ensure that the access plan not only meets load demand but also guarantees the safe and stable operation of the regional power grid.

[0065] Formulate a diversified load initial access plan, accurately match grid demand with load forecast, and ensure that the access plan is scientific and reasonable. Through in-depth analysis of its impact on grid voltage stability and power flow distribution, effectively balance load demand and grid security, and lay a solid foundation for efficient and stable operation of the grid. This move promotes the consumption of renewable energy and promotes the optimization and upgrading of energy structure.

[0066] The layered and component-based division of the regional power grid in S3 refers to dividing the power grid into multiple levels, such as the transmission layer and the distribution layer, according to the complex structure and functional characteristics of the power grid, so as to clarify the responsibilities and relationships between the levels. Furthermore, within each level, the power grid is further refined and disassembled into specific power components such as transformers, lines, and switches to ensure that the function and status of each component can be accurately grasped and managed, providing a solid foundation for the efficient operation and optimization of the regional power grid.

[0067] Dividing the regional power grid into layers and components can accurately locate the regional power grid structure, clarify hierarchical responsibilities, and refine component management. This move improves the transparency and controllability of regional power grid operations and provides a solid foundation for efficient operation and maintenance and optimized scheduling. At the same time, it promotes the optimal allocation of resources, ensures the safety and stability of the regional power grid, and promotes the intelligent and refined development of power supply.

[0068] The specific steps of establishing the rationality evaluation index system in S4 are as follows:

[0069] Step 1: Demand analysis and goal setting: First, clarify the main needs and goals of grid operation, such as ensuring voltage stability, optimizing power flow distribution, improving economic benefits and promoting environmental protection;

[0070] Step 2: Evaluation index design: For each evaluation index category, design specific and quantifiable indicators, such as voltage stability indicators including voltage deviation rate and voltage fluctuation rate, and power flow distribution indicators involving line load rate and power flow balance;

[0071] The formula for voltage deviation rate can be expressed as:

[0072] Voltage deviation rate = [(actual voltage - rated voltage) / rated voltage] × 100%

[0073] Determine the rated voltage: First, you need to know the rated voltage value of the equipment or system;

[0074] Measure actual voltage: Use a voltmeter or other measuring device to measure the actual voltage value at the time point or under the conditions that need to be evaluated;

[0075] Application formula: Substitute the actual voltage and rated voltage into the above formula to calculate the voltage deviation rate.

[0076] Result analysis: Based on the calculated voltage deviation rate, the degree of voltage deviation is evaluated. If the voltage deviation rate exceeds the specified limit (these limits are provided by the equipment manufacturer, power standards or safety regulations), measures need to be taken to adjust the voltage to ensure the normal operation and safety of the equipment or system.

[0077] The formula for voltage fluctuation rate can be expressed as:

[0078] Voltage fluctuation rate = (maximum voltage - minimum voltage) / average voltage (or rated voltage) × 100%. The calculation method is as follows:

[0079] Data acquisition: First, it is necessary to collect voltage data over a period of time. The voltage data can be a continuous analog signal or a discrete digital sample.

[0080] Data preprocessing: If the data is an analog signal, it needs to be converted into a digital signal through an analog-to-digital converter (ADC). In addition, the data needs to be filtered and denoised to improve the accuracy of the data;

[0081] Calculate the maximum and minimum values: traverse all voltage data points and find the maximum and minimum values;

[0082] Calculate the average voltage: Add all the voltage data points and divide by the total number of data points to get the average voltage, or, if the rated voltage is known, use the rated voltage as the denominator.

[0083] Application formula: Substitute the maximum value, minimum value and average voltage (or rated voltage) into the voltage fluctuation rate formula to calculate the voltage fluctuation rate;

[0084] Result analysis: Based on the calculated voltage fluctuation rate, the voltage stability of the power system is evaluated. If the voltage fluctuation rate exceeds the specified limit, measures need to be taken to improve the stability of the power system.

[0085] Step 3: Scoring criteria and weight setting: Set scoring criteria for each evaluation indicator, and clarify the level of the indicator to obtain the corresponding score. The scoring criteria should take into account the actual situation and industry standards to ensure fairness and rationality. At the same time, according to the importance of each indicator to the operation of the regional power grid, the corresponding weight is assigned. The entropy weight method is used to set the weight, and the entropy weight method formula is:

[0086]

[0087] Among them, m is the number of evaluation objects, n is the number of indicators, and p ij It is the normalized value of the i-th evaluation object on the j-th indicator.

[0088] The specific steps of building a calculation model and obtaining regional power grid operation data in S5 are as follows:

[0089] Step 1: Model construction: First, according to the hierarchical and component-based regional power grid structure, a detailed physical model of the regional power grid is constructed, including defining the connection relationship between each level, as well as the specific parameters and properties of the power components within each level;

[0090] Step 2: Algorithm selection and implementation: Select appropriate regional power grid operation calculation algorithms, such as power flow calculation and stability analysis, and integrate them into the model;

[0091] The power flow calculation formula is as follows:

[0092] Complex power: S = P + jQ, where P is active power and Q is reactive power;

[0093] Voltage and current relationship: In power systems, the relationship between voltage and current can be described by an impedance or admittance matrix;

[0094] Node power balance equation: This is the basic equation for power flow calculation, which describes the nonlinear relationship between node voltage and power. For any node, its node power balance equation can be written as:

[0095]

[0096] Where P i and Q i are the active power and reactive power injected into node i, respectively; U ˙i and U ˙k are the voltage phasors of nodes i and k, respectively; and Y ˙ik* is the conjugate transposed element of the node admittance matrix;

[0097] The steps of power flow calculation are as follows:

[0098] Data preparation: Collect the connection mode of the power grid, the parameters of each component (such as line resistance, reactance, transformer ratio and impedance), and operating conditions (such as active power and reactive power of each load point and power source point);

[0099] Establishing mathematical model: According to the wiring mode and parameters of the power grid, a mathematical model of the power network is established, which usually includes node voltage equations or loop current equations;

[0100] Select calculation method: According to the scale and complexity of the power grid, select the appropriate power flow calculation method, such as Newton-Raphson method and PQ decomposition method; Write calculation program: According to the selected calculation method, write the corresponding calculation program, which needs to be able to handle the topology, parameters and operating conditions of the power grid and perform iterative calculations;

[0101] Execute calculation: Run the calculation program, input the connection mode, parameters and operating condition data of the power grid, and perform power flow calculation. During the calculation process, the program will continuously iterate and update the node voltage and power parameters until the convergence conditions are met;

[0102] Result analysis: Analyze the calculation results to check whether the voltage of each node meets the requirements and whether the power of each branch exceeds the limit. If problems are found, adjust the wiring mode, parameters or operating conditions of the power grid according to the actual situation and recalculate the power flow;

[0103] Step 3: Data simulation and result acquisition: Use the constructed power grid operation calculation model to perform data simulation in multiple scenarios. By adjusting the parameters in the load access plan, simulate the operating status of the regional power grid under different conditions.

[0104] Among them, calculating the rationality score and evaluating the effect of diversified load access in S6 refers to performing a detailed scoring calculation on the regional power grid operation data based on the rationality evaluation index system, and obtaining the rationality score after the diversified load access. Through in-depth analysis of the scoring results, a comprehensive evaluation of the multiple impacts of diversified load access on the regional power grid is conducted, including improving energy utilization efficiency and promoting the positive effects of renewable energy consumption, as well as identifying potential negative challenges to the stability, economy and environmental protection of the regional power grid, providing a key reference for subsequent solution optimization.

[0105] Calculating rationality scores and evaluating the effects of diversified load access can accurately quantify the pros and cons of access solutions and fully reveal their multi-dimensional impacts on the power grid. This process not only highlights positive benefits, such as improving energy efficiency and renewable energy consumption, but also keenly captures potential negative challenges and provides solid data support for optimization strategies. Its benefits are to ensure the scientific nature of decision-making, accelerate the discovery of the best access solution, and promote the green and efficient development of the power grid.

[0106] The specific steps of determining and optimizing the diversified load access scheme in S7 are as follows:

[0107] Step 1: Solution judgment: First, based on the rationality score and effect evaluation results, conduct a comprehensive review of the current diversified load access solution, compare the score with the preset threshold or historical optimal solution, and consider the trade-off between positive and negative effects. If the score is high and the negative effect is within a controllable range, it can be preliminarily judged that the solution is close to or has reached the maximum absorption capacity. However, if the score is low or the negative effect is significant, further analysis and optimization are required.

[0108] Step 2: Scheme optimization: If the current scheme is not the maximum absorption capacity scheme, enter the optimization stage. According to the key issues identified in the effect evaluation, such as limited grid stability, poor economic performance, or failure to meet environmental protection indicators, the load access location, capacity, or timing are adjusted in a targeted manner. This may involve reallocating access points for different types of loads, adjusting the capacity of load access, or optimizing the timing of load access to balance the supply and demand relationship of the grid and improve the absorption capacity of renewable energy.

[0109] Step 3: Iteration: After completing an optimization, re-simulate the grid operation, obtain new operation data, and perform score calculation and effect evaluation again. Compare the new score value with the previous result to analyze the effectiveness of the optimization measures. If the score value is improved and the negative effect is alleviated, it means that the optimization direction is correct and you can continue to optimize. Otherwise, you need to review the optimization strategy and adjust the optimization direction. By repeating the iterative process from S5 to S7, you can gradually approach the access plan with the maximum absorption capacity until you find the best plan that meets the grid operation needs and goals.

[0110] By judging and optimizing the diversified load access scheme through the above steps, the power grid's absorption capacity can be systematically improved. This method not only ensures a comprehensive review and scientific evaluation of existing schemes, but also gradually approaches the access scheme with maximum absorption capacity through targeted optimization and cyclic iteration. This process not only improves the utilization rate of renewable energy, but also balances the supply and demand relationship of the power grid, and promotes the dual improvement of economy and environmental protection. Ultimately, it lays a solid foundation for the sustainable development of the power grid.

[0111] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0112] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for evaluating the diversified load accommodating capacity of a distribution network, characterized by: The specific steps of this evaluation method are as follows: S1: Obtain basic data of regional power grid: Collect comprehensive basic data of regional power grid to ensure accurate and well-founded assessment; S2: Develop an initial access plan for diversified loads: Design an access plan and assess its impact, and then divide the regional power grid into layers and components; S3: Divide the regional power grid into layers and components: The regional power grid is divided into layers according to structural functions, and the components are subdivided into transformers, lines, and switches; S4: Establish a rationality evaluation index system: Design regional power grid evaluation indicators, including stability, economy and environmental protection, and set scoring standards and weights; S5: Build a calculation model and obtain regional power grid operation data: The model is built to simulate the operation of the regional power grid and evaluate the impact of load access on voltage and current parameters; S6: Calculate the rationality score and evaluate the effect of diversified load access: The score calculation evaluates the rationality of load access, analyzes the effect, and clarifies the positive and negative impacts; S7: Determine and optimize diversified load access plans: Determine and optimize load access plans, iterate to the maximum absorption capacity, and ensure efficient operation of the regional power grid.

2. A method for evaluating the diversified load accommodating capacity of a distribution network according to claim 1, characterized in that: The specific steps of obtaining the basic data of the regional power grid in S1 are as follows: Step 1: Data collection and collation: First, collect basic data of the regional power grid from power companies, power grid dispatch centers and data monitoring station authorities. The basic data includes power grid structure diagrams, equipment technical parameters, historical load data and renewable energy power generation data; Step 2: Data cleaning: After arranging the basic data, data cleaning is performed to identify and correct errors, outliers, and missing values ​​in the data. By writing scripts or using data processing software, errors in the data can be automatically checked and corrected, such as inconsistent formats and abnormal value ranges. At the same time, missing basic data needs to be filled or deleted according to the actual situation. Step 3: Data verification and validation: After data cleaning is completed, data verification and validation are carried out to ensure that the cleaned data is accurate and meets the needs of subsequent analysis. The verification work includes comparing the data before and after cleaning to check whether there are omissions or errors in processing. At the same time, the accuracy and reliability of the data are verified through simulation calculations or comparison with other reliable data sources.

3. A method for evaluating the diversified load accommodating capacity of a distribution network according to claim 1, characterized in that: The initial access plan for diversified loads proposed in S2 is based on detailed regional power grid basic data and accurate load forecasting. A diversified load access plan is designed, covering multiple types of wind power, photovoltaics, and electric vehicles. The access location, appropriate capacity and access sequence of each load are clarified. Subsequently, through preliminary evaluation, the impact of the plan on the voltage stability and power flow distribution of the regional power grid is deeply analyzed.

4. A method for evaluating the diversified load accommodating capacity of a distribution network according to claim 1, characterized in that: The layered and component-based division of the regional power grid in S3 refers to dividing the regional power grid into multiple levels, such as the transmission layer and the distribution layer, based on the complex structure and functional characteristics of the regional power grid, clarifying the responsibilities and relationships between the levels, and then, within each level, further refining the regional power grid into specific power components such as transformers, lines, and switches, ensuring that the function and status of each component can be accurately grasped and managed, providing a solid foundation for the efficient operation and optimization of the regional power grid.

5. A method for evaluating the diversified load accommodating capacity of a distribution network according to claim 1, characterized in that: The specific steps of establishing the rationality evaluation index system in S4 are as follows: Step 1: Demand analysis and goal setting: First, clarify the main needs and goals of grid operation, such as ensuring voltage stability, optimizing power flow distribution, improving economic benefits and promoting environmental protection; Step 2: Evaluation index design: For each evaluation index category, design specific and quantifiable indicators, such as voltage stability indicators including voltage deviation rate and voltage fluctuation rate, and power flow distribution indicators involving line load rate and power flow balance; The formula for voltage deviation rate is: D represents the voltage deviation rate (VoltageDeviation); Vact represents the actual voltage (ActualVoltage); Vrat stands for rated voltage (RatedVoltage); The formula for voltage fluctuation rate is: F is the voltage fluctuation rate; Vmax is the maximum value of the voltage during a specified time period; Vmin is the minimum value of the voltage during a specified time period; Vref is the reference voltage value, which is the rated voltage, average voltage or other reference value; Step 3: Scoring criteria and weight setting: Set scoring criteria for each evaluation indicator, and clarify the level of the indicator to obtain the corresponding score. The scoring criteria should take into account the actual situation and industry standards to ensure fairness and rationality. At the same time, assign corresponding weights according to the importance of each indicator to the operation of the regional power grid; The entropy weight method is used to set the weights, and the entropy weight method formula is: Among them, m is the number of evaluation objects, n is the number of indicators, and p ij It is the normalized value of the i-th evaluation object on the j-th indicator.

6. A method for evaluating the diversified load accommodating capacity of a distribution network according to claim 1, characterized in that: The specific steps of building a calculation model and obtaining regional power grid operation data in S5 are as follows: Step 1: Model construction: First, according to the hierarchical and component-based regional power grid structure, a detailed physical model of the regional power grid is constructed, including defining the connection relationship between each level, as well as the specific parameters and properties of the power components within each level; Step 2: Algorithm selection and implementation: Select appropriate regional power grid operation calculation algorithms, such as power flow calculation and stability analysis, and integrate them into the model; The power flow calculation formula is as follows: Complex power: S = P + jQ, where P is active power and Q is reactive power; Voltage and current relationship: In power systems, the relationship between voltage and current is described by an impedance or admittance matrix; Node power balance equation: This is the basic equation for power flow calculation, which describes the nonlinear relationship between node voltage and power. For any node, its node power balance equation can be written as: Where Pi and Qi are the active power and reactive power injected into node i, respectively; U˙i and U˙k are the voltage phasors of nodes i and k, respectively; and Y˙ik* is the conjugate transposed element of the node admittance matrix; The steps of power flow calculation are as follows: Data preparation: Collect the wiring mode of the power grid, the parameters of each component (such as line resistance, reactance, transformer ratio and impedance), and operating conditions (such as active power and reactive power at each load point and power source point); Establishing mathematical model: According to the wiring mode and parameters of the power grid, a mathematical model of the power network is established, which usually includes node voltage equations or loop current equations; Select calculation method: According to the scale and complexity of the power grid, select the appropriate power flow calculation method, such as Newton-Raphson method and PQ decomposition method; Write calculation program: According to the selected calculation method, write the corresponding calculation program, which needs to be able to handle the topology, parameters and operating conditions of the power grid and perform iterative calculations; Execute calculation: Run the calculation program, input the connection mode, parameters and operating condition data of the power grid, and perform power flow calculation. During the calculation process, the program will continuously iterate and update the node voltage and power parameters until the convergence conditions are met; Result analysis: Analyze the calculation results to check whether the voltage of each node meets the requirements and whether the power of each branch exceeds the limit. If problems are found, adjust the wiring mode, parameters or operating conditions of the power grid according to the actual situation and recalculate the power flow; Step 3: Data simulation and result acquisition: Use the constructed power grid operation calculation model to perform data simulation in multiple scenarios. By adjusting the parameters in the load access plan, simulate the operating status of the regional power grid under different conditions.

7. A method for evaluating the diversified load accommodating capacity of a distribution network according to claim 1, characterized in that: Calculating the rationality score and evaluating the effect of diversified load access in S6 refers to performing a detailed scoring calculation on the regional power grid operation data based on the rationality evaluation index system, and obtaining a rationality score after diversified load access. By deeply analyzing the scoring results, a comprehensive evaluation is made of the multiple impacts of diversified load access on the regional power grid, including improving energy efficiency and promoting the positive effects of renewable energy consumption, as well as identifying potential negative challenges to the stability, economy and environmental protection of the regional power grid, providing a key reference for subsequent solution optimization.

8. A method for evaluating the diversified load accommodating capacity of a distribution network according to claim 1, characterized in that: The specific steps of determining and optimizing the diversified load access solution in S7 are as follows: Step 1: Solution judgment: First, based on the rationality score and effect evaluation results, conduct a comprehensive review of the current diversified load access solution, compare the score with the preset threshold or the historical optimal solution, and consider the trade-off between positive and negative effects; Step 2: Scheme optimization: If the current scheme is not the maximum absorption capacity scheme, the optimization phase is entered. According to the key issues identified in the effect evaluation, such as limited regional power grid stability, poor economic performance, or failure to meet environmental protection indicators, the load access location, capacity, or timing are adjusted in a targeted manner; Step 3: Iteration: After completing an optimization, re-simulate the regional power grid operation, obtain new operation data, and perform score calculation and effect evaluation again. Compare the new score value with the previous result, and analyze the effectiveness of the optimization measures. If the score value is improved and the negative effect is alleviated, it means that the optimization direction is correct and you can continue to optimize. Otherwise, you need to review the optimization strategy and adjust the optimization direction. By repeating the iterative process from S5 to S7, you can gradually approach the access plan with the maximum absorption capacity until you find the best plan that meets the regional power grid operation needs and goals.

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