High-quality grid architecture evaluation method based on flexible accommodation of low-carbon resources

Abstract

The application discloses a high-quality network frame evaluation method based on flexible consumption of low-carbon resources, and belongs to the technical field of power systems. The high-quality network frame evaluation method based on flexible consumption of low-carbon resources comprises the following steps: S1, investigating and analyzing advanced technologies and experiences in network frame evaluation of distribution networks at home and abroad; S2, selecting a research area, and investigating network frames in the selected research area; S3, analyzing research problems and development targets; S4, adopting subjective weighting methods, objective weighting methods and combined weighting methods. Through a comprehensive network frame evaluation system, decision makers can more accurately understand the problems and development potential of distribution networks, so that more definite decisions can be made. Through the establishment of an evaluation index system of power supply reliability, economic efficiency, green low carbon, high-quality service and digital-friendly, the sustainable development of economy and society can be promoted, the service level and customer satisfaction can be improved, the decision-making process can be optimized, and the resource utilization efficiency can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of power systems, in particular to a high-quality network architecture evaluation method based on flexible consumption of low-carbon resources. BACKGROUND

[0002] At present, with the rapid development of social economy and the continuous progress of science and technology, as an important infrastructure of modern society, the power system, as an important part of the power system, is directly related to the quality and efficiency of power supply, and is an important bridge between the power system and the user. The establishment of the evaluation index system of the distribution network architecture structure is of great significance to guide the planning, construction, operation and maintenance of the distribution network, and is a key tool to improve the management level and power supply quality of the distribution network.

[0003] The existing technology in the above has the following defects:

[0004] 1. The evaluation index is single, only focusing on reliability and economy, and ignoring green low-carbon, high-quality service, and digital-friendly, lacking systematicness and comprehensiveness, and difficult to fully reflect the construction requirements of the distribution network under the new situation;

[0005] 2. With the large-scale access of distributed new energy and the continuous emergence of new types of loads, the existing evaluation system cannot adapt to such changes.

[0006] 2. With the large-scale access of distributed new energy and the continuous emergence of new types of loads, the existing evaluation system cannot adapt to such changes. SUMMARY

[0007] In order to make up for the above shortcomings, the present application discloses a high-quality network architecture evaluation method based on flexible consumption of low-carbon resources, aiming to solve the problem of the development requirements of the distribution network under the new situation faced by the network architecture at the present stage.

[0008] The present application provides a high-quality network architecture evaluation method based on flexible consumption of low-carbon resources, comprising the following steps:

[0009] S1: Research and analyze the advanced technology and experience of distribution network architecture evaluation at home and abroad;

[0010] S2: Select the research area, research the network architecture in the selected research area, understand the current pain points and deficiencies of the network architecture in the research area, and the target for future development;

[0011] S3: According to the research problem analysis result and the development target, the level division, index selection and criterion of the evaluation system are determined, and the index system is constructed from the research area;

[0012] S4: The weights of each index are determined by using subjective weighting method, objective weighting method and combined weighting method;

[0013] S5: The judgment matrix is constructed through expert scoring or data analysis to ensure that the relative importance between indexes is reasonably reflected;

[0014] S6: The current grid and target grid cluster are scored by using the evaluation system, and the scoring results are obtained, and the gap between the current grid and the development target is explained, and the focus of future grid development is clarified.

[0015] In a preferred mode of the present application, the research area includes reliable power supply, economic efficiency, green low carbon, high-quality service and digital intelligence. The core index of reliable power supply, economic efficiency, the auxiliary index of green low carbon, high-quality service and digital intelligence form an evaluation index system; a reasonable and accurate index system will directly affect the planning effectiveness evaluation efficiency and effectiveness evaluation effect of the medium-voltage target grid.

[0016] In a preferred mode of the present application, each dimension of the research area includes a reliable power supply index, an economic efficiency index, a green low carbon index, a high-quality service index and a digital intelligence index; the five evaluation index dimensions constitute a whole, which can effectively evaluate the advantages and disadvantages of the medium-voltage target grid and guide the future development direction of the region; according to the collected data, a calculation formula is determined to calculate the value of each index; these indexes can include but are not limited to renewable energy penetration rate, power grid flexibility, power system reliability, energy efficiency, etc.

[0017] In a preferred mode of the present application, the reliable power supply index quantifies the subordinate indexes, including

[0018] ①Reliable power supply rate:

[0019] ②Substation full stop full transfer:

[0020] ③Substation main transformer N-1 pass rate:

[0021] ④10kV medium-voltage line N-1 pass rate:

[0022] ⑤10kV line contact rate:

[0023] ⑥Distribution automation three remote terminal coverage rate:

[0024]

[0025] ⑦Distribution automation site optical fiber coverage rate:

[0026]

[0027] ⑧Distribution automation coverage:

[0028] In a preferred mode of the present application, in the substation full stop full transfer (A2), the full stop full transfer refers to the substation full station stop, and the load on the medium voltage line can be transferred to other substations through the medium voltage line.

[0029] In the N-1 passing rate of the medium voltage line (A4), the satisfaction of N-1 refers to that when the line has N-1 outage, the non-fault section should be restored as soon as possible by means of relay protection automatic device, automation means or on-site manual switching, and the fault section is restored after the fault is repaired.

[0030] In a preferred mode of the present application, the subordinate indicators of the economic and efficient index quantification include

[0031] ①Integrated line loss rate:

[0032] ②Average equipment load rate:

[0033] ③Unit investment power supply increase: In a preferred mode of the present application, the subordinate indicators of the green and low-carbon index quantification include

[0034] ①New energy penetration rate:

[0035] ②New energy utilization rate:

[0036] ③Distributed power access rate:

[0037] ④Electric vehicle charging pile installation access rate:

[0038] ⑤Adjustable resource calling rate: In a preferred mode of the present application, the subordinate indicators of the service quality index quantification include

[0039] ①Customer service time limit compliance rate:

[0040]

[0041] ②Power supply service "ten commitments" exchange rate: In a preferred mode of the present application, the subordinate indicators of the digital friendly index quantification include

[0042] ①Intelligent fusion terminal coverage:

[0043] ②Digitalization rate of power distribution services:

[0044] ③Demand management electricity saving rate:

[0045]

[0046] ④Corresponding load reduction rate on the demand side:

[0047] ⑤On-line monitoring rate of grid-connected distributed power:

[0048]

[0049] ⑥Load monitoring rate of load control system:

[0050] In a preferred mode of the present application, data collection is further included in S1, collecting data related to evaluation indexes, including renewable energy power generation data, power grid operation data and load demand data; these data can come from actual monitoring, simulation calculation or other reliable sources.

[0051] Beneficial effects: further focusing on the differentiated typical areas of reliability, economy and low-carbon resources, researching the high-quality medium-voltage distribution network main network structure for flexible utilization of low-carbon resources, providing a comprehensive, scientific and operable evaluation index system, which can comprehensively consider the reliability, economy, green low-carbon, high-quality service, digital-friendly and other aspects of the medium-voltage target network, to support the applicability and rationality of the target network to meet the development needs of the medium-voltage target network of the distribution network. Through this evaluation system, it serves the high-quality development of the distribution network and provides an important basis for decision-makers to develop regional power grids. It solves the problem of the development requirements of the distribution network under the new situation faced by the network at the present stage;

[0052] 1. Through a comprehensive network evaluation system, decision-makers can more accurately understand the problems and development potential of the distribution network, so as to make more definite decisions.

[0053] 2. The evaluation system can help identify key pain points and priority investment areas in the medium-voltage network, thereby optimizing capital allocation and improving investment efficiency.

[0054] 3. By establishing a green, low-carbon, high-quality service, digital-friendly evaluation index system, it can promote the sustainable development of economy and society, improve service level and customer satisfaction, optimize the decision-making process, improve resource utilization efficiency, and promote technological innovation;

[0055] 4、The evaluation system has flexibility, and the universality of the evaluation system is enhanced by adjusting the weight of the evaluation indexes according to different regions.

[0056] 5、By establishing the service index evaluation system, the power company can pay more attention to the service experience of the user, timely respond to the user demand, improve the quality and efficiency of the power supply service, and thus improve the satisfaction of the user. BRIEF DESCRIPTION OF DRAWINGS

[0057] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced as follows, and it should be understood that the following drawings only show some embodiments of the present application, and should not be regarded as a limitation to the scope, and other related drawings can also be obtained by those skilled in the art without paying creative labor on the premise of not paying creative labor.

[0058] Fig. 1 is the thought flow process diagram of the high-quality network evaluation based on low-carbon flexibility provided by the embodiments of the present application;

[0059] Fig. 2 is the index selection diagram of the high-quality network evaluation based on low-carbon flexibility provided by the embodiments of the present application. DETAILED DESCRIPTION

[0060] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integrated; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0061] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature "on", "above" and "above" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "below" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0062] The technical solutions in the embodiments of the present application will be described below in combination with the drawings in the embodiments of the present application; the described embodiments are part of the embodiments of the present application, not all the embodiments.

[0063] Referring to Figs. 1-2 The application provides a high-quality network architecture evaluation method based on flexible consumption of low-carbon resources, comprising the following steps:

[0064] S1: Investigate and analyze advanced technologies and experiences in distribution network architecture evaluation at home and abroad;

[0065] S2: Select a research area, investigate the network architecture in the selected research area, understand the current pain points and deficiencies of the network architecture in the research area, and the target for future development;

[0066] S3: According to the research problem analysis result and the development target, the level division, index selection and criterion of the evaluation system are determined, and the index system is constructed from the research area;

[0067] S4: The subjective weighting method, the objective weighting method and the combined weighting method are used to determine the weight of each index;

[0068] S5: Through expert scoring or data analysis, a judgment matrix is constructed to ensure that the relative importance between indexes is reasonably reflected;

[0069] S6: The evaluation system is used to score the current network architecture and the target network architecture cluster, and the scoring result is obtained, and the gap between the current network architecture and the development target is explained, and the focus of future network architecture development is clarified.

[0070] In the specific embodiment of the application, the research area includes power supply reliability, economic efficiency, green low carbon, high-quality service and digital friendly. The core index power supply reliability, economic efficiency, the auxiliary index green low carbon, high-quality service and digital friendly form an evaluation index system; a reasonable and accurate index system will directly affect the planning effectiveness evaluation efficiency and effectiveness evaluation effect of the medium-voltage target network architecture.

[0071] In the specific embodiment of the application, each dimension of the research area includes power supply reliability index, economic efficiency index, green low carbon index, high-quality service index and digital friendly index; the five evaluation index dimensions constitute a whole, which can effectively evaluate the advantages and disadvantages of the medium-voltage target network architecture, and can also be used to guide the direction of future regional development; according to the collected data, a calculation formula is determined to calculate the value of each index; these indexes can include but are not limited to renewable energy penetration rate, power grid flexibility, power system reliability, energy efficiency, etc.

[0072] In the specific embodiment of the application, the power supply reliability index quantifies the subordinate indexes, including

[0073] ① Power supply reliability rate:

[0074] ② Substation full stop full transfer:

[0075] ③ Substation main transformer N-1 passing rate:

[0076] ④ 10kV medium voltage line N-1 passing rate:

[0077] ⑤ 10kV line contact rate:

[0078] ⑥ Distribution automation three remote terminal coverage:

[0079]

[0080] ⑦ Distribution automation site fiber coverage:

[0081]

[0082] ⑧ Distribution automation coverage:

[0083] In the specific embodiments of the present application, in the substation full stop full transfer (A2), the full stop full transfer refers to that after the substation full station is out of service, the load on the medium voltage public line can be transferred to other substations through the medium voltage line.

[0084] In the medium voltage line N-1 passing rate (A4), the satisfaction of N-1 refers to that when the line is N-1 outage, the non-fault section should be restored as soon as possible by means of relay protection automatic device, automation means or on-site manual switching, and the fault section is restored after the fault is repaired.

[0085] In the specific embodiments of the present application, the economic and efficient index quantization subordinate index includes

[0086] ① Comprehensive line loss rate:

[0087] ② Equipment average load rate:

[0088] ③ Unit investment power supply increase:

[0089] In the specific embodiments of the present application, the green low carbon index quantization subordinate index includes

[0090] ① New energy penetration rate:

[0091] ② New energy utilization rate:

[0092] ③ Distributed power access rate:

[0093] ④Electric vehicle charging pile installation access rate:

[0094] ⑤Adjustable resource call rate:

[0095] In the specific embodiment of the present application, the subordinate indicators of the service quality index quantification include

[0096] ①Customer service time limit compliance rate:

[0097]

[0098] ②Power supply service "ten commitments" exchange rate:

[0099] In the specific embodiment of the present application, the subordinate indicators of the digital friendly index quantification include

[0100] ①Intelligent fusion terminal coverage rate:

[0101] ②Power distribution business digitization rate:

[0102] ③Demand management electricity saving:

[0103]

[0104] ④Demand side corresponding load reduction rate:

[0105] ⑤On-line monitoring rate of grid-connected distributed power:

[0106]

[0107] ⑥Load control system load monitoring rate:

[0108] In the specific embodiment of the present application, in S1, data collection is also included, which collects data related to evaluation indicators, including renewable energy generation data, power grid operation data and load demand data; these data can come from actual monitoring, simulation calculation or other reliable sources.

[0109] The high-quality grid evaluation method based on flexible consumption of low-carbon resources further focuses on the reliability, economy, and differentiation of low-carbon resources in different typical regions to study the high-quality medium-voltage distribution grid main grid structure for flexible utilization of low-carbon resources, providing a comprehensive, scientific, and operable evaluation index system that can consider the reliability, economy, green low-carbon, high-quality service, and digital-friendly aspects of the target medium-voltage grid to support the adaptability and rationality of the target grid to meet the development needs of the medium-voltage target grid. Through this evaluation system, it serves the high-quality development of the distribution grid and provides an important basis for decision-makers to develop regional power grids. It solves the problem of the development requirements of the distribution grid under the new situation faced by the grid at the present stage.

[0110] Through a comprehensive grid evaluation system, decision-makers can more accurately understand the problems and development potential of the distribution grid, making more explicit decisions.

[0111] The evaluation system can help identify key pain points and priority investment areas in the medium-voltage grid, optimizing capital allocation and improving investment efficiency.

[0112] By establishing a green low-carbon, high-quality service, and digital-friendly evaluation index system, it can promote the sustainable development of the economy and society, improve service levels and customer satisfaction, optimize the decision-making process, improve resource utilization efficiency, and promote technological innovation.

[0113] The evaluation system is flexible, and for different regions, the weights of the evaluation indicators are adjusted to enhance the universality of the evaluation system.

[0114] By establishing a service index evaluation system, power companies can pay more attention to user service experience, respond to user needs in a timely manner, and improve the quality and efficiency of power supply services, thereby improving user satisfaction.

[0115] Power supply reliability: The power supply reliability index plays a huge role in ensuring reliable power supply for residents and social development, and grid reliability evaluation is the theoretical basis and basis for the safe construction and rapid development of the target grid;

[0116] Economical and efficient: The economical and efficient index can understand the inefficient links in the operation and construction of the grid, thereby guiding the rational allocation of resources, reducing unnecessary waste, and improving the overall economic efficiency of the grid;

[0117] Green and low-carbon: The green and low-carbon index helps promote the transformation of the power system to a low-carbon economy, reduces the negative impact on the environment, and promotes sustainable development;

[0118] High-quality service: The high-quality service index can measure the response speed, service attitude, and service efficiency of power grid enterprises in the service process, thereby promoting power grid enterprises to improve power supply service quality and enhance the sense of acquisition and satisfaction of users;

[0119] Digital friendly: The digital friendly index helps to evaluate the intelligent level of the power distribution network, and effectively promotes the construction of digital intelligent power distribution network.

[0120] Typical case: Select A area as a typical area, establish evaluation index:

[0121] A area power grid basic situation: A area area 288 square kilometers, power supply population 328,000 people, business house number 178,400, maximum load 31.554 MW in 2023, total social power consumption 1322 million kilowatt hours, comprehensive voltage qualified rate 99.949%, average capacity of household distribution 3.41 kVA. The evaluation index selection and calculation formula are shown in table 1;

[0122] Table 1 evaluation index specific situation table

[0123]

[0124]

[0125] Index calculation results

[0126] Power supply reliability index

[0127] ① Power supply reliability rate:

[0128] ② Substation full stop full transfer:

[0129]

[0130] Note: Full stop full transfer refers to the full stop of substation, and the load of medium voltage public line can be transferred to other substations through medium voltage line.

[0131] ③ Substation main transformer N-1 passing rate:

[0132] ④ 10kV medium voltage line N-1 passing rate:

[0133]

[0134] Note: N-1 is met, which means that when N-1 outage occurs on the line, the non-fault segment should be restored as soon as possible through relay protection automatic device, automation means or on-site manual switching, and the fault segment is restored after fault repair.

[0135] ⑤ 10kV line contact rate:

[0136] ⑥ Distribution automation three remote terminal coverage rate:

[0137]

[0138] ⑦Optical fiber coverage rate of power distribution automation station:

[0139]

[0140] ⑧Coverage rate of power distribution automation:

[0141]

[0142] Economically efficient indicators

[0143] ①Integrated line loss rate:

[0144] ②Average equipment load rate: ③Unit investment in power supply:

[0145]

[0146] Green and low-carbon indicators

[0147] ①New energy penetration rate:

[0148] ②New energy utilization rate:

[0149]

[0150] ③Distributed power access rate:

[0151]

[0152] ④Electric vehicle charging pile installation access rate:

[0153]

[0154] ⑤Adjustable resource call rate:

[0155]

[0156] Service quality indicators

[0157] ①Customer industry expansion service time limit compliance rate:

[0158]

[0159] ②Power supply service "Ten Commitments" exchange rate:

[0160]

[0161] Digital-friendly indicators

[0162] ①Smart integrated terminal coverage rate:

[0163]

[0164] ②Digitalization rate of power distribution business:

[0165]

[0166] ③Electricity saving rate of demand management:

[0167]

[0168] ④Load reduction rate of demand side:

[0169]

[0170] ⑤Online monitoring rate of grid-connected distributed power:

[0171]

[0172] ⑥Load monitoring rate of load control system:

[0173]

[0174] Weight calculation

[0175] The index weight refers to the quantified value of the relative importance of each evaluation index in the overall evaluation score. The calculation method can be divided into subjective weighting method, objective weighting method and combined weighting method. In this paper, the subjective weighting method uses the analytic hierarchy process to calculate the weight, the objective weighting method uses the CRI T I C method to calculate the weight, and the combined weighting method uses the cooperative game method to calculate the weight. Table 2 shows the final calculation results.

[0176] Table 2: Weight of comprehensive evaluation index of medium voltage network

[0177]

[0178]

[0179] When analyzing the effectiveness of distribution network planning, it is necessary to determine the rationality of each index value, because the power grid will only achieve a better operation effect within a certain range. In this paper, the evaluation criteria of the following indicators are determined by combining the values of some indicators specified in the guidelines such as "Urban Distribution Network Planning and Design Guidelines" and the experience of many experts in existing literature.

[0180] Table 3: Index scoring results

[0181]

[0182]

[0183] The calculation result: according to the combination weight and the scoring result of each index, the evaluation dimension score is obtained, and the final A area overall score is 80.81 points.

[0184] Table 4 calculation result

[0185]

[0186] Conclusion: this patent considers that the existing evaluation system at this stage is only for distribution network, and there is no index system for evaluating medium-voltage target network at present. With the large-scale access of distributed new energy and the continuous emergence of new types of load, the existing evaluation system cannot support the evaluation of this situation. For this reason, a comprehensive and systematic evaluation system is established to evaluate the medium-voltage target network from five dimensions of power supply reliability, economic efficiency, green low carbon, service quality and digital friendly. According to the quantitative results of each index, the weak links of the distribution network are found out, and effective suggestions and practical theoretical support are provided for power grid construction. The current network score is 80.01 points, and the scores of economic efficiency, green low carbon and digital friendly are below 80 points. The future investment should focus on improving the index situation in these three dimensions.

[0187] The above only describes the embodiments of the present application and is not used to limit the protection scope of the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

Claims

1. A high-quality grid structure evaluation method based on flexible utilization of low-carbon resources, characterized in that, Includes the following steps: S1: Data collection, collecting data related to evaluation indicators, including renewable energy generation data, grid operation data, and load demand data; S2: Select a survey area and conduct a survey on the space frame within the selected survey area; S3: Based on the analysis results of the survey issues and development goals, clarify the hierarchical division of the evaluation system, the selection of indicators, and the judgment criteria, and construct an indicator system from the surveyed area; S4: Use subjective weighting, objective weighting and combined weighting methods to determine the weight of each indicator; S5: Construct a judgment matrix through expert scoring or data analysis to ensure that the relative importance of indicators is reasonably reflected; S6: Use the evaluation system to score the existing grid structure and the target grid structure cluster, and obtain the scoring results; Each dimension of the surveyed area includes power supply reliability indicators, economic efficiency indicators, green and low-carbon indicators, service quality indicators, and digital friendliness indicators. The quantitative sub-indicators of the power supply reliability index include: ① Power supply reliability: ; ② All substations are shut down or switched on: ; ③ Substation main transformer N-1 throughput rate: ; ④ 10kV medium voltage line N-1 pass rate: ; ⑤ 10kV line interconnection rate: ; ⑥ Coverage rate of remote control terminals for power distribution automation: ； ⑦ Fiber optic coverage of power distribution automation sites: ； ⑧ Distribution automation coverage: ; The quantitative indicators of economic efficiency include: ① Overall line loss rate: ; ② Average equipment load rate: ; ③ Increase in electricity supply per unit investment: ; The quantitative indicators for green and low-carbon indicators include: ① Penetration rate of new energy sources: ; ② New energy utilization rate: ; ③ Distributed power supply integration rate: ; ④ Electric vehicle charging pile installation and connection rate: ; ⑤ Adjustable resource utilization rate: ; The service quality indicator quantification includes the following sub-indicators: ① Customer business expansion service time-limit compliance rate: ； ② Redemption rate of the ten commitments to power supply services: ； The sub-indicators of the Digital Intelligence Friendly Index include: ① Coverage of intelligent converged terminals: ; ② Digitalization rate of power distribution services: ; ③ Demand management saves electricity: ； ④ Demand-side corresponding load reduction rate: ; ⑤ Online monitoring rate of grid-connected distributed power sources: ； ⑥ Load monitoring rate of the load control system: 。 2. The method for evaluating high-quality grid structures based on flexible utilization of low-carbon resources according to claim 1, characterized in that, The surveyed areas include areas with reliable power supply, economic efficiency, green and low-carbon characteristics, high-quality service, and digital friendliness.

3. The method for evaluating high-quality grid structures based on flexible utilization of low-carbon resources according to claim 1, characterized in that, In the context of a complete substation shutdown and transfer, a complete shutdown and transfer means that after the entire substation is shut down, all the loads carried by its medium-voltage public lines are transferred to other substations via medium-voltage lines. In the N-1 pass rate of medium-voltage lines, meeting N-1 means that when an N-1 outage occurs, the non-faulty section should be restored to power supply through automatic relay protection devices, automated means, or on-site manual switching, and the faulty section should be restored to power supply after the fault is repaired.

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