Urban power distribution network equipment utilization rate evaluation system and evaluation method

Abstract

The invention discloses an urban power distribution network equipment utilization rate evaluation method. The method comprises the following steps: S1, investigating and analyzing understanding and application of power industries at home and abroad on asset development efficiency; s2, analyzing from the aspects of power grid level, management level, social influence, environment and the like to obtain main factors influencing the asset development efficiency of the power distribution network; s3, constructing a power distribution network equipment development efficiency evaluation index system from two aspects of equipment operation capability and equipment operation level; and S4, aiming at the evaluation and analysis of the stock power distribution network asset development efficiency, implementing a corresponding improvement strategy and method. The urban power distribution network equipment utilization rate evaluation system comprises problem searching, problem analysis, improvement evaluation and strategy making. According to the method, a solution can be provided for the low-efficiency operation problem of urban stock assets, the idle power grid equipment is reduced, the power utilization equipment is in the optimal operation state, the use efficiency of the power utilization equipment is improved, and economic production is promoted.

Description

Technical Field

[0001] This invention relates to the field of power grid equipment technology, and in particular to an evaluation system and method for evaluating the utilization rate of urban power distribution network equipment. Background Technology

[0002] With the continuous development of new energy sources, the development of power distribution networks also faces new challenges. As the scale of new energy access continues to expand, the reliability and carrying capacity of power distribution networks need to be continuously improved. However, to cope with the rapid development of load, power grid planning and construction often consider a large capacity margin. During power grid operation, the load control of main transformers in high-voltage distribution substations is too low, resulting in low load on single-circuit lines and low load rates. The "N-1" criterion is commonly used in power distribution network planning and design, which requires that "under normal operating conditions, if any component (such as a line, generator, transformer, etc.) in the power system is fault-free or disconnected due to a fault, the power system should be able to maintain stable operation and normal power supply, other components should not be overloaded, and voltage and frequency should be within the allowable range." Through the interpretation of the "N-1" criterion, it can be seen that the load transfer capacity and mutual support capacity of each level of the power grid should be considered when applying the "N-1" criterion. However, in actual work, the "N-1" verification of main transformers in high-voltage distribution substations rarely considers the ability to transfer load through the 10kV power grid. This results in low utilization of power grid equipment, and there is no suitable method to evaluate the actual utilization of power grid equipment, leading to problems not being resolved in a timely manner and low asset development efficiency. Summary of the Invention

[0003] The purpose of this invention is to provide an evaluation system and method for the utilization rate of urban power distribution network equipment, which can provide solutions to the problem of inefficient operation of existing urban assets, reduce the idleness of power grid equipment, ensure that the equipment is in optimal operating condition, improve the utilization efficiency of the equipment, and promote economic production.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a method for evaluating the utilization rate of urban power distribution network equipment, comprising the following steps:

[0005] S1. Conduct research and analysis on the understanding and application of asset development efficiency in the domestic and international power industries, and use the analytic hierarchy process and equipment life cycle management to analyze the influencing factors of distribution network asset development efficiency from two aspects.

[0006] S2. Analyze the main factors affecting the development efficiency of distribution network assets from the perspectives of power grid level, management level, social impact and environment, and then analyze each main factor to find the specific factors affecting the development efficiency of local distribution network assets.

[0007] S3. Construct an evaluation index system for the development efficiency of power distribution network equipment from two aspects: equipment operating capacity and equipment operating level. The expected value E of the expert score is obtained from formula (1):

[0008]

[0009] Among them, a i These are the scores given by experts in this field, where m is the number of experts.

[0010] The standard deviation of expert opinions, δ, is calculated according to formula (2):

[0011]

[0012] Based on the characteristics of the specific problem, a dispersion control index δ0 is set to stop the solicitation. When the correlation calculation value δ0 of the i-th iteration is... i When δ i The solicitation ends when the value is less than δ0; otherwise, the solicitation continues.

[0013] S4. Evaluate and analyze the development efficiency of existing distribution network assets, summarize the problems in the utilization of high and medium voltage distribution network equipment, and implement corresponding improvement strategies and methods based on the existing assets in different regions.

[0014] Optionally, in step S3, the 110 kV and below power grid equipment is analyzed and evaluated.

[0015] The urban power distribution network equipment utilization evaluation system includes problem identification, problem analysis, improvement evaluation, and strategy development. Problem identification involves using historical operational data and current status of the power distribution network to identify problems in the utilization efficiency of power grid equipment. Problem analysis involves establishing an expert group to analyze these problems and pinpoint their sources. Improvement evaluation involves evaluating the utilization rates of 110 kV, 35 kV, and medium- and low-voltage power grid equipment separately, identifying the correlation between utilization rates and problems. Strategy development involves developing different strategies to improve equipment utilization rates based on the unique circumstances of each city, precisely addressing the problems.

[0016] Optionally, the evaluation content for 110 kV and 35 kV power grid equipment includes the capacity-to-load ratio, the proportion of heavy overload in substations, the proportion of light overload in substations, the average value of the maximum load rate of substations, the average value of the equivalent average load rate of substations, the proportion of heavy overload in lines, the proportion of light overload in lines, the average value of the maximum load rate of lines, and the average value of the equivalent average load rate of lines.

[0017] Optionally, the evaluation content for medium and low voltage power grid equipment includes the proportion of heavy overload on 10 kV lines, the proportion of light overload on 10 kV lines, the proportion of heavy overload on 0.4 kV distribution transformers, and the proportion of light overload on 0.4 kV distribution transformers.

[0018] The urban power distribution network equipment utilization evaluation system and method of the present invention have the following advantages:

[0019] (1) By analyzing the various factors affecting the development efficiency of power grid assets, we can determine the sources of these factors and their impact on the development efficiency of power grid assets, formulate improvement strategies, and conduct a comprehensive assessment of the distribution network.

[0020] (2) Use electrical equipment to be in optimal operating condition, reduce the idleness of power grid equipment, improve the efficiency of electrical equipment use, promote economic production, and improve product quality.

[0021] (3) Providing reliable and high-quality power supply to power users can improve customer satisfaction, help establish a harmonious power supply and consumption relationship, and ensure the rapid and stable development of rural economy and society. Attached Figure Description

[0022] Figure 1 This is a technical circuit diagram of the present invention.

[0023] Figure 2 This is a schematic diagram of the power distribution network equipment utilization evaluation system of the present invention. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings.

[0025] like Figures 1-2 As shown, the method for evaluating the utilization rate of urban power distribution network equipment includes the following steps:

[0026] S1. This study investigates and analyzes the understanding and application of asset development efficiency in the domestic and international power industries. It employs the analytic hierarchy process (AHP) and equipment lifecycle management to analyze the influencing factors of distribution network asset development efficiency from two perspectives. Due to differences in systems and power grid development stages, the stability level of the power grid and the functional positioning of power grids at different voltage levels vary. The roles played by substations and distribution equipment in different locations also differ. Therefore, power grid asset development efficiency cannot be simply calculated by dividing the maximum load by the rated load; it should be comprehensively assessed in conjunction with various internal and external conditions. Developed countries in Europe and America emphasize systematic short-term optimization planning and asset renewal that coordinates different voltage levels, focusing more on improving reliability and economy. In contrast, domestic power grid planning and design generally considers grid construction based on meeting electricity demand under maximum load conditions, and also considers a certain construction margin depending on the rate of load growth.

[0027] S2. Analyze the main factors affecting the development efficiency of distribution network assets from the perspectives of power grid level, management level, social impact and environment, and then analyze each main factor to find the specific factors affecting the development efficiency of local distribution network assets.

[0028] S3. An evaluation index system for the development efficiency of power distribution network equipment is constructed from two aspects: equipment operation capacity and equipment operation level. The main focus is on the analysis and evaluation of power distribution network equipment of 110 kV, 35 kV, 10 kV and 0.4 kV. The expected value E of the expert score is obtained from formula (1):

[0029]

[0030] Among them, a i These are the scores given by experts in this field, where m is the number of experts.

[0031] The standard deviation of expert opinions, δ, is calculated according to formula (2):

[0032]

[0033] Based on the characteristics of the specific problem, a dispersion control index δ0 is set to stop the solicitation. When the correlation calculation value δ0 of the i-th iteration is... i When δ i The solicitation ends when the value is less than δ0; otherwise, the solicitation continues.

[0034] S4. Evaluate and analyze the development efficiency of existing distribution network assets, summarize the problems in the utilization of high and medium voltage distribution network equipment, and implement corresponding improvement strategies and methods based on the existing assets in different regions.

[0035] The urban power distribution network equipment utilization evaluation system includes problem identification, problem analysis, improvement evaluation, and strategy development.

[0036] Problem identification: By analyzing historical operating data and current status of the distribution network, identify problems in the utilization efficiency of power grid equipment and categorize the identified problems as follows: 1. Equipment that has been operating for many years but is still lightly loaded, and newly commissioned substations that are already heavily loaded; 2. Overly high judgment standards and arbitrary implementation measures; 3. Some areas have large-scale construction, serious light loads, and a lack of reasonable basis for distribution network planning and investment.

[0037] Problem Analysis: An expert group was established to analyze the problems in the utilization efficiency of power grid equipment and identify the sources of the problems. 1. Lack of refined equipment selection principles; 2. Lack of supporting evidence for proposed solutions; 3. Lack of an investment allocation model based on equipment utilization efficiency.

[0038] Evaluation Improvement: The utilization rates of 110 kV, 35 kV, and medium- and low-voltage power grid equipment are evaluated separately to find the correlation between utilization rates and problems. The evaluation content for 110 kV and 35 kV power grid equipment includes capacity-to-load ratio, substation heavy overload ratio, substation light overload ratio, average maximum load rate of substation, average equivalent average load rate of substation, line heavy overload ratio, line light overload ratio, average maximum load rate of line, and average equivalent average load rate of line. The evaluation content for medium- and low-voltage power grid equipment includes 10 kV line heavy overload ratio, 10 kV line light overload ratio, 0.4 kV distribution transformer heavy overload ratio, and 0.4 kV distribution transformer light overload ratio.

[0039] Strategies: For equipment issues, an "implementation-prevention" improvement strategy will be adopted through an evaluation system to enhance equipment utilization. For regionally differentiated issues, a localized "source-pathway-end" improvement strategy will be employed. For asset allocation issues, a "principle-solution-investment" improvement strategy will be used. Different strategies for improving equipment utilization will be precisely formulated for different problems to reduce idle power grid equipment, improve the efficiency of electrical equipment, and promote economic production.

[0040] The embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the protection scope of the present invention.

Claims

1. A method for evaluating the utilization rate of urban power distribution network equipment, characterized in that, Includes the following steps: S1. Conduct research and analysis on the understanding and application of asset development efficiency in the domestic and international power industries, and use the analytic hierarchy process and equipment life cycle management to analyze the influencing factors of distribution network asset development efficiency from two aspects. S2. Analyze the main factors affecting the development efficiency of distribution network assets from the perspectives of power grid level, management level, social impact and environment, and then analyze each main factor to find the specific factors affecting the development efficiency of local distribution network assets. S3. Construct an evaluation index system for the development efficiency of power distribution network equipment from two aspects: equipment operating capacity and equipment operating level. The expected value E of the expert score is obtained from formula (1): Among them, a i These are the scores given by experts in this field, where m is the number of experts. The standard deviation of expert opinions, δ, is calculated according to formula (2): Based on the characteristics of the specific problem, a dispersion control index δ0 is set to stop the solicitation. When the correlation calculation value δ0 of the i-th iteration is... i When δ i The solicitation ends when the value is less than δ0; otherwise, the solicitation continues. S4. Evaluate and analyze the development efficiency of existing distribution network assets, summarize the problems in the utilization of high and medium voltage distribution network equipment, and implement corresponding improvement strategies and methods based on the existing assets in different regions.

2. The method for evaluating the utilization rate of urban power distribution network equipment as described in claim 1, characterized in that: In step S3, the 110 kV and below power grid equipment is analyzed and evaluated.

3. The evaluation system using the urban power distribution network equipment utilization evaluation method according to claim 1, characterized in that: This includes problem identification, problem analysis, improvement evaluation, and strategy development; Problem identification: Identify problems in the utilization efficiency of power grid equipment by analyzing historical operating data and current status of the distribution network; Problem analysis: Establish an expert group to analyze the problems in the utilization efficiency of power grid equipment and find the source of the problems; Improvement evaluation: Evaluate the utilization rate of 110 kV, 35 kV, and medium and low voltage power grid equipment respectively, and find the correspondence between utilization rate and problems; Develop strategies: Based on the different situations in various cities, develop different strategies to improve equipment utilization and solve problems precisely.

4. The urban power distribution network equipment utilization evaluation system as described in claim 3, characterized in that: The evaluation of 110 kV and 35 kV power grid equipment includes the following: capacity-to-load ratio, proportion of heavy overload in substations, proportion of light overload in substations, average maximum load rate of substations, average equivalent average load rate of substations, proportion of heavy overload in lines, proportion of light overload in lines, average maximum load rate of lines, and average equivalent average load rate of lines.

5. The urban power distribution network equipment utilization evaluation system as described in claim 3, characterized in that: The evaluation of medium and low voltage power grid equipment includes the proportion of heavy overload on 10 kV lines, the proportion of light overload on 10 kV lines, the proportion of heavy overload on 0.4 kV distribution transformers, and the proportion of light overload on 0.4 kV distribution transformers.

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