CN111552925B - Construction method of comprehensive evaluation index system of alternating-current/direct-current series-parallel power distribution network - Google Patents

Construction method of comprehensive evaluation index system of alternating-current/direct-current series-parallel power distribution network Download PDF

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CN111552925B
CN111552925B CN202010329044.4A CN202010329044A CN111552925B CN 111552925 B CN111552925 B CN 111552925B CN 202010329044 A CN202010329044 A CN 202010329044A CN 111552925 B CN111552925 B CN 111552925B
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power distribution
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CN111552925A (en
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韩俊
袁栋
谢珍建
蔡超
杜渐
陈曦
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Economic and Technological Research Institute of State Grid Jiangsu Electric Power Co Ltd
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    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
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    • G06F17/18—Complex mathematical operations for evaluating statistical data, e.g. average values, frequency distributions, probability functions, regression analysis
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    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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    • Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications

Abstract

A construction method of an integrated evaluation index system of an AC/DC series-parallel power distribution network comprises the following steps: constructing an integrated evaluation index system framework of the alternating-current and direct-current series-parallel power distribution network; and (3) respectively calculating: a power supply quality evaluation index, a power supply capacity evaluation index, an equipment technical level evaluation index, an economical efficiency evaluation index and a source-load development level evaluation index; determining the weighting value of the evaluation index comprises the following steps: the membership matrix of the evaluation index is standardized, the specific gravity of the index value of the ith evaluation object under the jth index is calculated, the entropy value of the jth index is calculated, the difference coefficient of the jth index is calculated, and the weight of the jth index is calculated; and comprehensively evaluating the AC/DC series-parallel power distribution network. The invention can obtain the macroscopic effect index condition for evaluating the AC/DC hybrid power distribution network and the microscopic index condition for influencing the construction effect of the AC/DC hybrid power distribution network, has a guiding effect on the construction and development of the AC/DC hybrid power distribution network, and can scientifically and effectively evaluate the comprehensive benefit of the AC/DC hybrid power distribution network.

Description

Construction method of comprehensive evaluation index system of alternating-current/direct-current series-parallel power distribution network
Technical Field
The invention relates to a construction method of a power distribution network evaluation system. In particular to a construction method of an integrated evaluation index system of an AC/DC series-parallel power distribution network.
Background
The traditional power distribution network mainly adopts an alternating current power supply mode, and along with the gradual implementation of national energy conservation and emission reduction strategies and the increasing progress of related technologies, the power generation technology also presents diversified development requirements, and the power generation technology is reflected in the increasing of direct current power sources and direct current loads to a great extent. Most of the electric energy generated by a photovoltaic power supply, wind power generation, fuel cells, energy storage units (batteries, super capacitors and the like) and other distributed power generation systems is direct current; the common electrical equipment and large direct current load such as computers, air conditioning equipment, refrigeration equipment, electric automobiles, data centers, electrified locomotives and the like are more convenient to adopt direct current power supply. In the alternating current distribution network, the direct current source charges are connected to the alternating current distribution network with corresponding voltage levels through DC/AC, AC/DC and DC/DC converters, or are firstly networked into a direct current micro-grid and then connected to the alternating current distribution network through the converters. If the direct current distribution network with the corresponding grade is directly connected, part of the converter can be omitted, loss is reduced, and power supply and distribution efficiency and economy of the power grid are improved. Therefore, the direct-current power distribution network is used as an effective supplement of the alternating-current power distribution network to form an alternating-current and direct-current series-parallel connection mode, and the direct-current power distribution network becomes a development trend of a future power distribution network. However, the current ac/dc hybrid distribution network is not mature enough in terms of grid structure and the like, and how to evaluate the comprehensive benefits of the ac/dc hybrid distribution network according to the networking mode of the ac/dc hybrid distribution network has become an important problem in the current ac/dc distribution network development process.
Aiming at the problem that the existing AC/DC hybrid power distribution network lacks a comprehensive evaluation method, the invention provides a method for constructing an AC/DC hybrid power distribution network comprehensive evaluation index system, and the evaluation method has a guiding effect on construction and development of the AC/DC hybrid power distribution network.
Disclosure of Invention
The invention aims to solve the technical problem of providing a construction method of an integrated evaluation index system of an alternating current/direct current hybrid power distribution network, which can scientifically and effectively evaluate the integrated benefit of the alternating current/direct current hybrid power distribution network.
The technical scheme adopted by the invention is as follows: a construction method of an integrated evaluation index system of an AC/DC series-parallel power distribution network comprises the following steps:
1) The method comprises the steps of constructing an integrated evaluation index system framework of an alternating current/direct current series-parallel power distribution network, wherein the integrated evaluation index system framework is a three-level evaluation system formed by five primary indexes including power supply quality, power supply capacity, equipment technical level, economy and source-load development level;
2) Calculating three-level evaluation indexes, wherein the three-level evaluation indexes are as follows: a power supply quality evaluation index, a power supply capacity evaluation index, an equipment technical level evaluation index, an economical efficiency evaluation index and a source-load development level evaluation index;
3) Determining the weighting value of the evaluation index comprises the following steps: the membership matrix of the evaluation index is standardized, the specific gravity of the index value of the ith evaluation object under the jth index is calculated, the entropy value of the jth index is calculated, the difference coefficient of the jth index is calculated, and the weight of the jth index is calculated;
4) And comprehensively evaluating the AC/DC series-parallel power distribution network.
According to the construction method of the comprehensive evaluation index system of the AC/DC hybrid power distribution network, provided by the invention, the macro effect index condition of the AC/DC hybrid power distribution network and the micro index condition affecting the construction effect of the AC/DC hybrid power distribution network can be obtained, the comprehensive scoring result is obtained through scientific calculation of weights, the construction and development of the AC/DC hybrid power distribution network are guided, and the comprehensive benefit of the AC/DC hybrid power distribution network can be scientifically and effectively evaluated.
Detailed Description
The method for constructing the comprehensive evaluation index system of the alternating-current and direct-current series-parallel power distribution network is described in detail below by combining with the embodiment.
The invention discloses a construction method of an integrated evaluation index system of an alternating current-direct current series-parallel power distribution network, which comprises the following steps:
1) Constructing an integrated evaluation index system framework of an alternating current/direct current series-parallel power distribution network, wherein the integrated evaluation index system framework is a three-level evaluation system formed by five primary indexes including power supply quality, power supply capacity, equipment technical level, economy and source-load development level, as shown in table 1;
Table 1 comprehensive evaluation index system for AC/DC series-parallel power distribution network
Wherein said steps are as follows:
(1.1) primary indexes of power supply quality, including two secondary indexes of an alternating current power distribution network and a direct current power distribution network, wherein,
the secondary indexes of the alternating current power distribution network comprise seven tertiary indexes including alternating current power supply reliability, alternating current line N-1 verification passing rate, alternating current line average power supply radius, alternating current line average segmentation number, alternating current line interconnection rate, alternating current comprehensive voltage qualification rate, alternating current voltage instantaneous drop and short-time interruption occurrence rate;
the secondary indexes of the direct current power distribution network comprise seven tertiary indexes including direct current power supply reliability, direct current line N-1 verification passing rate, direct current line average power supply radius, direct current line average segmentation number, direct current line interconnection rate, direct current comprehensive voltage qualification rate, direct current voltage instantaneous drop and short-time interruption occurrence rate;
(1.2) primary indexes of power supply capacity, comprising three secondary indexes of an alternating current power distribution network, a direct current power distribution network and an alternating current-direct current conversion device, wherein,
the secondary indexes of the alternating current power distribution network comprise four tertiary indexes of an alternating current line maximum load rate average value, an alternating current transformer maximum load rate average value, an alternating current line overload rate and an alternating current transformer overload rate;
The secondary indexes of the direct-current power distribution network comprise four three-level indexes including a maximum load rate average value of a direct-current circuit, a maximum load rate average value of a direct-current transformer, a direct-current circuit overload rate and a direct-current transformer overload rate;
the secondary indexes of the AC/DC conversion device comprise two tertiary indexes of the maximum load rate average value of the AC/DC conversion device and the overload rate of the AC/DC conversion device;
(1.3) equipment technology level primary indexes including three secondary indexes of an alternating current power distribution network, a direct current power distribution network and an alternating current-direct current conversion device; wherein, the liquid crystal display device comprises a liquid crystal display device,
the secondary indexes of the alternating current power distribution network comprise four tertiary indexes including an alternating current switch three-remote terminal duty ratio, an alternating current power distribution automation coverage rate, an alternating current communication network coverage rate and an alternating current line cabling rate;
the secondary indexes of the direct-current power distribution network comprise four tertiary indexes including a direct-current switch three-remote terminal duty ratio, direct-current power distribution automation coverage rate, direct-current communication network coverage rate and direct-current line cabling rate;
the secondary index of the AC/DC conversion device comprises a tertiary index of the communication network coverage rate of the AC/DC conversion device;
(1.4) economic primary indexes including three secondary indexes of an alternating current power distribution network, a direct current power distribution network and an alternating current-direct current conversion device; wherein, the liquid crystal display device comprises a liquid crystal display device,
The secondary indexes of the alternating current power distribution network comprise three tertiary indexes including an average load rate of an alternating current circuit, an average load rate of an alternating current transformer and an integrated loss rate of the alternating current power distribution network; the secondary indexes of the direct-current power distribution network comprise three tertiary indexes including an average load rate of a direct-current circuit, an average load rate of a direct-current transformer and a comprehensive loss rate of the direct-current power distribution network;
the secondary indexes of the AC/DC conversion device comprise two tertiary indexes of average load rate of the AC/DC conversion device and comprehensive loss rate of the AC/DC conversion device;
(1.5) for the primary index of the source-load development level, including three secondary indexes of an alternating current power distribution network, a direct current power distribution network and an alternating current-direct current conversion device; wherein, the liquid crystal display device comprises a liquid crystal display device,
the second-level index of the alternating current power distribution network comprises a third-level index of direct current power supply inversion grid-connected permeability;
the secondary index of the direct current power distribution network comprises a tertiary index of grid-connected permeability of a direct current power supply;
the second-level index of the AC-DC conversion device comprises a third-level index of the permeability of the AC-DC conversion device.
2) Calculating three-level evaluation indexes, wherein the three-level evaluation indexes are as follows: a power supply quality evaluation index, a power supply capacity evaluation index, an equipment technical level evaluation index, an economical efficiency evaluation index and a source-load development level evaluation index; the method specifically comprises the following steps:
(2.1) calculation of a power supply quality evaluation index, including:
(2.1.1) calculating evaluation indexes of the alternating-current power distribution network, wherein the evaluation indexes comprise:
(2.1.1.1) calculation of ac power supply reliability evaluation index:
the alternating current power supply reliability is the percentage of the ratio of the difference between the statistical period time (h) and the average power failure time (h) of all users of the alternating current power distribution network to the statistical period time, and the calculation formula is as follows:
(2.1.1.2) calculation of the evaluation index of the pass rate of the alternating current line N-1 is as follows:
the verification passing rate (%) of the alternating current power distribution network line N-1 is the percentage of the ratio of the sum of the line numbers (bars) of the alternating current power distribution network which meet N-1 to the total line number (bar) of the alternating current power distribution network, and the calculation formula is as follows:
(2.1.1.3) calculating an average power supply radius evaluation index of the alternating current line as follows:
the average power supply radius (km) of an alternating current line is the ratio of the sum (km) of the power supply radii of the alternating current line in the alternating current power distribution network to the total number (strip) of the alternating current line in the alternating current power distribution network, wherein the power supply radius of the alternating current line in the alternating current power distribution network refers to the line length between an outgoing line of an alternating current-direct current conversion device and the farthest load point of power supply of the alternating current-direct current conversion device, and the calculation formula is as follows:
(2.1.1.4) calculation of an evaluation index of the average number of segments of the ac line:
The average number of segments (segments/strips) of the alternating current line is the ratio of the sum (segments) of the number of segments of the alternating current line in all the alternating current power distribution network to the total number (strips) of the lines in the alternating current power distribution network, and the calculation formula is as follows:
(2.1.1.5) calculation of the ac line contact rate evaluation index is:
the line connection rate (%) of the alternating current power distribution network is the percentage of the ratio of the sum of the line numbers (bars) in the medium voltage alternating current power distribution network with connection to the total line number (bars) in the medium voltage alternating current power distribution network, and the calculation formula is as follows:
(2.1.1.6) calculating an alternating-current comprehensive voltage qualification rate evaluation index as follows:
the ac comprehensive voltage qualification rate refers to the percentage of the accumulated running time of the actual running voltage deviation of all nodes in the ac power distribution network within the limit value range and the corresponding total running statistical time when actually running, and the ac comprehensive voltage qualification rate and the ac monitoring point voltage qualification rate are calculated according to the following formulas:
wherein: v is an evaluation index of the qualification rate of the alternating current comprehensive voltage; v (V) A The qualification rate of the A-class alternating current monitoring points is determined; v (V) B The qualification rate of the B-class alternating current monitoring points is determined; v (V) C The qualification rate of the C-type alternating current monitoring points is; v (V) D The qualification rate of the D-class alternating current monitoring points is determined; v (V) i The voltage qualification rate of the A or B or C or D type alternating current monitoring points is determined; t is t up The voltage exceeds the upper limit time; t is t low The voltage exceeds the lower limit time; t is the total operation statistics time;
(2.1.1.7) the calculation of the ac voltage transient dip and short interruption occurrence rate evaluation index is:
the occurrence rate of the instantaneous drop and short-time interruption of the alternating-current voltage refers to the percentage of the number of days when the instantaneous drop or short-time interruption of the voltage occurs at the monitoring points of the alternating-current power distribution network to the total operation statistical number of days at each alternating-current monitoring point, and the calculation formula is as follows:
(2.1.2) calculating evaluation indexes of the direct-current power distribution network, wherein the evaluation indexes are as follows:
(2.1.2.1) calculation of the dc power supply reliability evaluation index is:
the ratio of the difference between the statistical period time (h) and the average power failure time (h) of all users in the direct current power distribution network to the statistical period time is calculated as follows:
(2.1.2.2) calculating the evaluation index of the pass rate of the direct current line N-1 as follows:
the ratio of the sum of the line numbers (bars) in the direct current power distribution network to the total line number (bars) in the direct current power distribution network meeting N-1 is calculated as follows:
(2.1.2.3) calculating an average power supply radius evaluation index of the direct current circuit as follows:
the ratio of the sum (km) of the power supply radius of the direct current line in the direct current power distribution network to the total number (strip) of the direct current line in the direct current power distribution network, wherein the power supply radius of the direct current line in the direct current power distribution network refers to the length of the line from an outgoing line of an alternating current-direct current conversion device to the farthest load point of the power supply of the alternating current-direct current conversion device, and the calculation formula is as follows:
(2.1.2.4) calculating an average segmentation number evaluation index of the direct current line as follows:
the average number of segments (segments/strips) of the direct current line is the ratio of the sum (segments) of the number of segments of all lines in the direct current power distribution network to the total number (strips) of the lines in the direct current power distribution network, and the calculation formula is as follows:
(2.1.2.5) calculating a direct current line contact rate evaluation index as follows:
the ratio of the sum of the number (bars) of the medium voltage direct current lines connected with each other to the total number (bars) of the medium voltage direct current lines exists, and the calculation formula is as follows:
(2.1.2.6) calculating a direct-current comprehensive voltage qualification rate evaluation index as follows:
in actual operation, the calculation formulas of the cumulative operation time of the actual operation voltage deviation of all nodes in the direct current power distribution network within the limit value range and the corresponding total operation statistical time are as follows:
wherein: v is the qualification rate of the direct current comprehensive voltage; v (V) A The qualification rate of the class A direct current monitoring point is determined; v (V) B The qualification rate of the B-class direct current monitoring points is determined; v (V) C The qualification rate of the C-type direct current monitoring point is determined; v (V) D The qualification rate of the D-class direct current monitoring point is determined; v (V) i The voltage qualification rate of the class A or B or C or D direct current monitoring point is determined; t is t up The voltage exceeds the upper limit time; t is t low The voltage exceeds the lower limit time; t is the total operation statistics time;
(2.1.2.7) calculating an evaluation index of the occurrence rate of the instantaneous drop of the direct current voltage and the short interruption as follows:
the ratio of the number of days when voltage transient drop or short interruption occurs at the monitoring points of the direct current power distribution network to the total operation statistical number of days of each direct current monitoring point is calculated according to the following formula:
(2.2) calculation of a power supply capability evaluation index, including:
(2.2.1) calculation of evaluation index of alternating-current distribution network, there are
(2.2.1.1) calculating an average value evaluation index of the maximum load factor of the alternating current line:
the ratio of the sum of the maximum load rates of all the alternating current lines to the total number of the alternating current lines in the alternating current distribution network, wherein the maximum load rate of a single alternating current line is the ratio of the annual maximum load of the single alternating current line to the rated transmission power of the single alternating current line, and the calculation formula is as follows:
(2.2.1.2) calculating an average value evaluation index of the maximum load factor of the alternating-current transformer as follows:
the ratio of the sum of the maximum load rates of all transformers to the total number of the transformers in the alternating current distribution network, wherein the maximum load rate of a single alternating current transformer is the ratio of the annual maximum load of the single alternating current transformer to the rated transmission power of the single alternating current transformer, and the calculation formula is as follows:
(2.2.1.3) calculating an alternating current line overload rate evaluation index as follows:
The total number of the heavy-load lines in the alternating-current power distribution network accounts for the proportion of the total number of the lines in the alternating-current power distribution network, wherein the heavy-load lines of the alternating-current power distribution network refer to equipment with the maximum load rate exceeding 80% and the duration exceeding 2 hours, and the calculation formula is as follows:
(2.2.1.4) calculating an evaluation index of the overload rate of the alternating-current transformer:
the proportion of the total number of the heavy-duty transformers in the alternating-current power distribution network to the total number of the transformers in the alternating-current power distribution network, wherein the heavy-duty transformers in the alternating-current power distribution network refer to equipment with the maximum load rate exceeding 80% and the duration exceeding 2 hours, and the calculation formula is as follows:
(2.2.2) calculation of evaluation index of DC Power distribution network, there are
(2.2.2.1) calculating an average value evaluation index of the maximum load factor of the direct current line as follows:
the ratio of the sum of the maximum load rates of all lines to the total number of lines in the direct current power distribution network, wherein the maximum load rate of a single direct current line is the ratio of the annual maximum load of the single direct current line to the rated transmission power of the single direct current line, and the calculation formula is as follows:
(2.2.2.2) calculating an average value evaluation index of the maximum load factor of the direct current transformer as follows:
the ratio of the sum of the maximum load rates of all transformers to the total number of the transformers in the direct current distribution network, wherein the maximum load rate of a single direct current transformer is the ratio of the annual maximum load of the single direct current transformer to the rated transmission power of the single direct current transformer, and the calculation formula is as follows:
(2.2.2.3) calculating a direct current line overload rate evaluation index as follows:
the proportion of the total number of heavy-load lines in the direct-current power distribution network to the total number of lines in the direct-current power distribution network, wherein the heavy-load lines of the direct-current power distribution network refer to equipment with the maximum load rate exceeding 80% and the duration exceeding 2 hours, and the calculation formula is as follows:
(2.2.2.4) calculating the heavy load rate evaluation index of the direct current transformer as follows:
the total number of heavy-load transformers in the direct-current power distribution network accounts for the proportion of the total number of transformers in the direct-current power distribution network, wherein the heavy-load transformers of the direct-current power distribution network refer to equipment with the maximum load rate exceeding 80% and the duration exceeding 2 hours, and the calculation formula is as follows:
(2.2.3) calculation of evaluation index of AC/DC converter, there are
(2.2.3.1) calculating an average value evaluation index of the maximum load factor of the ac/dc converter:
the ratio of the sum of the maximum load rates of all the AC/DC conversion devices to the total number of the AC/DC conversion devices, wherein the maximum load rate of a single AC/DC conversion device is the ratio of the annual maximum load of the single AC/DC conversion device to the rated capacity of the single AC/DC conversion device, and the calculation formula is as follows:
(2.2.3.2) calculating the overload rate evaluation index of the AC/DC conversion device as follows:
The total number of the heavy-load alternating-current/direct-current conversion devices accounts for the proportion of the total number of the alternating-current/direct-current conversion devices, wherein the heavy-load alternating-current/direct-current conversion devices refer to equipment with the maximum load rate exceeding 80% and the duration exceeding 2 hours, and the calculation formula is as follows:
(2.3) calculation of equipment technical level evaluation index, comprising:
(2.3.1) calculation of evaluation index of alternating-current distribution network, there are
(2.3.1.1) calculating a three-remote terminal duty ratio evaluation index of the alternating current switch as follows:
the ratio of the number of switches (stations) of the three remote terminals configured in the alternating-current power distribution network to the total number of switches (stations) of the automatic distribution terminal configured in the alternating-current power distribution network is calculated as follows:
(2.3.1.2) calculating an alternating-current power distribution automation coverage rate evaluation index as follows:
the proportion of the number (bars) of the medium-voltage alternating-current distribution network lines of the distribution automation terminal to the total number of lines in the medium-voltage alternating-current distribution network is configured, and the calculation formula is as follows:
(2.3.1.3) calculating an ac communication network coverage rate evaluation index as follows:
an average value of an alternating current feeder communication network coverage rate (%) and a network coverage rate (%) communicated by an alternating current station, wherein the feeder communication network coverage rate (%) is a ratio of the number (a) of alternating current feeder terminals covering a communication access network to the total number (a) of the alternating current feeder terminals; station communication network coverage (%) is the ratio of the number(s) of stations of an ac station covering a communication access network to the total number(s) of stations of the ac station, and the calculation formula is as follows:
(2.3.1.4) calculation of the evaluation index of the cable rate of the ac line:
for the ratio of the sum of the lengths (km) of the alternating current cable lines in the alternating current power distribution network to the total length (km) of the alternating current lines in the alternating current power distribution network, the calculation formula is as follows:
(2.3.2) calculation of evaluation index of DC Power distribution network, there are
(2.3.2.1) calculating a three-remote terminal duty ratio evaluation index of the direct current switch as follows:
the ratio of the number of switches (stations) for configuring the three remote terminals in the direct-current distribution network to the total number of switches (stations) for configuring the distribution automation terminal of the direct-current distribution network is calculated as follows:
(2.3.2.2) calculating an evaluation index of the coverage rate of the direct-current power distribution automation as follows:
the proportion of the number (bars) of lines in the medium-voltage direct-current distribution network of the distribution automation terminal to the total number of lines in the medium-voltage direct-current distribution network is configured, and the calculation formula is as follows:
(2.3.2.3) calculating a direct current communication network coverage rate evaluation index as follows:
an average value of a direct current feeder communication network coverage rate (%) and a network coverage rate (%) communicated by a direct current station, wherein the feeder communication network coverage rate (%) is a ratio of the number(s) of direct current feeder terminals covering a communication access network to the total number(s) of direct current feeder terminals; the station communication network coverage (%) is the ratio of the number (number) of terminals of the direct current station covering the communication access network to the total number (number) of terminals of the direct current station, and the calculation formula is as follows:
(2.3.2.4) calculation of the evaluation index of the cable rate of the direct current circuit is as follows:
the ratio of the sum of the lengths (km) of the direct-current cable lines in the direct-current power distribution network to the total length (km) of the direct-current cable lines in the direct-current power distribution network is calculated as follows:
(2.3.3) calculating an evaluation index of the ac/dc conversion device, wherein the calculation of the evaluation index of the coverage rate of the communication network of the ac/dc conversion device is as follows:
the ratio of the number (number) of the terminals of the AC/DC conversion device to the total number (number) of the terminals of the AC/DC conversion device covering the communication access network is calculated as follows:
(2.4) economic indicators
(2.4.1) calculating an evaluation index of the power supply capacity of the alternating-current power distribution network, which comprises the following steps:
(2.4.1.1) calculation of an average load factor evaluation index of the ac line:
the ratio of the sum of average load rates of all the alternating current lines to the total number of the alternating current lines in the alternating current distribution network, wherein the average load rate of a single alternating current line is the ratio of the total load of the single alternating current line in an evaluation period to the time of the evaluation period, and the calculation formula is as follows:
(2.4.1.2) calculation of an average load factor evaluation index of an ac transformer is:
the ratio of the sum of the average load rates of all the alternating current transformers of the alternating current distribution network to the total number of the alternating current transformers, wherein the average load rate of a single alternating current transformer is the ratio of the total load of the single alternating current transformer in an evaluation period to the time of the evaluation period, and the calculation formula is as follows:
(2.4.1.3) calculating an evaluation index of the comprehensive loss rate of the alternating-current power distribution network as follows:
the difference between the power supply quantity and the sales power quantity of the alternating-current power distribution network accounts for the proportion of the power supply quantity of the alternating-current power distribution network, and the calculation formula is as follows:
(2.4.2) calculation of evaluation index of DC Power distribution network, there are
(2.4.2.1) calculating an average load factor evaluation index of the direct current line as follows:
the ratio of the sum of average load rates of all direct current lines to the total number of the direct current lines in the direct current distribution network, wherein the average load rate of a single direct current line is the ratio of the total load of the single direct current line in an evaluation period to the time of the evaluation period, and the calculation formula is as follows:
(2.4.2.2) calculating an average load factor evaluation index of the direct current transformer as follows:
the ratio of the sum of the average load rates of all the direct current transformers to the total number of the direct current transformers in the direct current distribution network, wherein the average load rate of a single direct current transformer is the ratio of the total load of the single direct current transformer in an evaluation period to the time of the evaluation period, and the calculation formula is as follows:
(2.4.2.3) calculating an evaluation index of the comprehensive loss rate of the direct-current power distribution network as follows:
the difference between the power supply quantity and the sales power quantity in the direct-current power distribution network accounts for the proportion of the power supply quantity in the direct-current power distribution network, and the calculation formula is as follows:
(2.4.3) calculation of evaluation index of AC/DC converter, there are
(2.4.3.1) calculating an average load factor evaluation index of the ac/dc conversion device as follows:
the ratio of the sum of the average load rates of all the AC/DC conversion devices to the total number of the AC/DC conversion devices, wherein the average load rate of a single AC/DC conversion device is the ratio of the total load of the single AC/DC conversion device in an evaluation period to the time of the evaluation period, and the calculation formula is as follows:
(2.4.3.2) calculating an evaluation index of the comprehensive loss rate of the AC/DC conversion device as follows:
the ratio of the difference between the total input electric quantity (kWh) and the total output electric quantity (kWh) of the AC/DC conversion device to the total input electric quantity of the AC/DC conversion device is calculated as follows:
(2.5) calculation of a source-load development level evaluation index, including:
(2.5.1) calculating an evaluation index of the alternating-current power distribution network, namely calculating a permeability evaluation index of a direct-current inversion grid-connected power supply, wherein the evaluation index is as follows:
the ratio of the total installed capacity (MW) of the DC power source in the inversion grid connection to the annual maximum load (MW) of the AC distribution network is calculated as follows:
(2.5.2) calculating the direct current power distribution network evaluation index, namely calculating the direct current grid-connected power supply permeability evaluation index, wherein the method comprises the following steps:
the percentage of the ratio of the capacity (MW) of the direct current grid-connected power supply to the annual maximum load (MW) of the direct current distribution network is calculated as follows:
(2.5.3) calculating an ac/dc conversion device index evaluation index, which is a calculation of an ac/dc conversion device permeability evaluation index, as follows: the ratio of the capacity (MW) of the AC-DC conversion device to the annual maximum load (MW) of the AC-DC series-parallel power distribution network is calculated as follows:
3) Determining the weighting value of the evaluation index comprises the following steps: the membership matrix of the evaluation index is standardized, the specific gravity of the index value of the ith evaluation object under the jth index is calculated, the entropy value of the jth index is calculated, the difference coefficient of the jth index is calculated, and the weight of the jth index is calculated;
the invention utilizes an entropy weight method to determine the weight of the index, entropy is a measure of the disorder degree of the system, and information entropy is a measure of the order degree of the system. The smaller the information entropy of a certain evaluation index, the larger the degree of variation of the index value, the larger the information amount provided, and the larger the function in the comprehensive evaluation, namely the larger the weight of the index. Therefore, the weight of each index can be calculated by using the information entropy according to the degree of variation of each index. In a regional system having m evaluation indexes and n evaluation targets, the entropy weight calculation step of the evaluation indexes comprises the following steps:
(3.1) standardization of evaluation index membership matrix
Since the indexes are different in dimension, content and value quality standards, firstly, the index values are standardized, and n evaluation objects correspond to the index values of m evaluation indexes to form a membership degree evaluation matrix R as follows:
wherein r is ij An index value of the j-th evaluation index which is the i-th evaluation target.
(3.2) calculating the specific gravity of the i-th evaluation target index value under the j-th index
Wherein P is ij The specific gravity of the j index which is the i-th evaluation target.
(3.3) calculating the entropy value of the j-th index:
wherein H is j Entropy value of the j index; n is the total number of evaluation objects.
(3.4) calculating a difference coefficient of the j-th index:
α j ＝1-H j
wherein alpha is j Is the difference coefficient of the j-th index.
(3.5) calculating the weight of the j-th index:
wherein omega is j The weight of the j index; m is the total number of evaluation indexes.
4) The comprehensive evaluation of the alternating current-direct current series-parallel power distribution network comprises the following steps:
(5.1) calculating three-level index values of the alternating current-direct current series-parallel power distribution network, selecting an entropy weight method to weight single indexes to obtain weights of all three-level indexes, and carrying out weighted calculation to obtain scores of all two-level indexes;
(5.2) weighting the secondary indexes by using an entropy weight method again to obtain the weight of each secondary index, and obtaining the score of each primary index by weighting calculation;
And (5.3) obtaining the comprehensive score of the regional AC/DC hybrid power distribution network, and giving an evaluation conclusion of the comprehensive effect of the regional AC/DC hybrid power distribution network planning and construction scheme according to the comprehensive score.

Claims (1)

1. The method for constructing the comprehensive evaluation index system of the alternating current-direct current series-parallel power distribution network is characterized by comprising the following steps of:
1) The method comprises the steps of constructing an integrated evaluation index system framework of an alternating current/direct current series-parallel power distribution network, wherein the integrated evaluation index system framework is a three-level evaluation system formed by five primary indexes including power supply quality, power supply capacity, equipment technical level, economy and source-load development level; wherein said steps are as follows:
(1.1) primary indexes of power supply quality, including two secondary indexes of an alternating current power distribution network and a direct current power distribution network, wherein,
the secondary indexes of the alternating current power distribution network comprise seven tertiary indexes including alternating current power supply reliability, alternating current line N-1 verification passing rate, alternating current line average power supply radius, alternating current line average segmentation number, alternating current line interconnection rate, alternating current comprehensive voltage qualification rate, alternating current voltage instantaneous drop and short-time interruption occurrence rate;
the secondary indexes of the direct current power distribution network comprise seven tertiary indexes including direct current power supply reliability, direct current line N-1 verification passing rate, direct current line average power supply radius, direct current line average segmentation number, direct current line interconnection rate, direct current comprehensive voltage qualification rate, direct current voltage instantaneous drop and short-time interruption occurrence rate;
(1.2) primary indexes of power supply capacity, comprising three secondary indexes of an alternating current power distribution network, a direct current power distribution network and an alternating current-direct current conversion device, wherein,
the secondary indexes of the alternating current power distribution network comprise four tertiary indexes of an alternating current line maximum load rate average value, an alternating current transformer maximum load rate average value, an alternating current line overload rate and an alternating current transformer overload rate;
the secondary indexes of the direct-current power distribution network comprise four three-level indexes including a maximum load rate average value of a direct-current circuit, a maximum load rate average value of a direct-current transformer, a direct-current circuit overload rate and a direct-current transformer overload rate;
the secondary indexes of the AC/DC conversion device comprise two tertiary indexes of the maximum load rate average value of the AC/DC conversion device and the overload rate of the AC/DC conversion device;
(1.3) equipment technology level primary indexes including three secondary indexes of an alternating current power distribution network, a direct current power distribution network and an alternating current-direct current conversion device; wherein, the liquid crystal display device comprises a liquid crystal display device,
the secondary indexes of the alternating current power distribution network comprise four tertiary indexes including an alternating current switch three-remote terminal duty ratio, an alternating current power distribution automation coverage rate, an alternating current communication network coverage rate and an alternating current line cabling rate;
the secondary indexes of the direct-current power distribution network comprise four tertiary indexes including a direct-current switch three-remote terminal duty ratio, direct-current power distribution automation coverage rate, direct-current communication network coverage rate and direct-current line cabling rate;
The secondary index of the AC/DC conversion device comprises a tertiary index of the communication network coverage rate of the AC/DC conversion device;
(1.4) economic primary indexes including three secondary indexes of an alternating current power distribution network, a direct current power distribution network and an alternating current-direct current conversion device; wherein, the liquid crystal display device comprises a liquid crystal display device,
the secondary indexes of the alternating current power distribution network comprise three tertiary indexes including an average load rate of an alternating current circuit, an average load rate of an alternating current transformer and an integrated loss rate of the alternating current power distribution network; the secondary indexes of the direct-current power distribution network comprise three tertiary indexes including an average load rate of a direct-current circuit, an average load rate of a direct-current transformer and a comprehensive loss rate of the direct-current power distribution network;
the secondary indexes of the AC/DC conversion device comprise two tertiary indexes of average load rate of the AC/DC conversion device and comprehensive loss rate of the AC/DC conversion device;
(1.5) for the primary index of the source-load development level, including three secondary indexes of an alternating current power distribution network, a direct current power distribution network and an alternating current-direct current conversion device; wherein, the liquid crystal display device comprises a liquid crystal display device,
the second-level index of the alternating current power distribution network comprises a third-level index of direct current power supply inversion grid-connected permeability;
the secondary index of the direct current power distribution network comprises a tertiary index of grid-connected permeability of a direct current power supply;
The second-level index of the AC-DC conversion device comprises a third-level index of the permeability of the AC-DC conversion device;
2) Calculating three-level evaluation indexes, wherein the three-level evaluation indexes are as follows: a power supply quality evaluation index, a power supply capacity evaluation index, an equipment technical level evaluation index, an economical efficiency evaluation index and a source-load development level evaluation index; comprising the following steps:
(2.1) calculation of a power supply quality evaluation index, including:
(2.1.1) calculating evaluation indexes of the alternating-current power distribution network, wherein the evaluation indexes comprise:
(2.1.1.1) calculation of ac power supply reliability evaluation index:
the alternating current power supply reliability is the percentage of the ratio of the difference between the statistical period time and the average power failure time of all users of the alternating current power distribution network to the statistical period time, and the calculation formula is as follows:
(2.1.1.2) calculation of the evaluation index of the pass rate of the alternating current line N-1 is as follows:
the verification passing rate of the alternating current power distribution network line N-1 is the ratio of the sum of the line numbers of the alternating current power distribution network which meets N-1 to the total line number of the alternating current power distribution network, and the calculation formula is as follows:
(2.1.1.3) calculating an average power supply radius evaluation index of the alternating current line as follows:
the average power supply radius of the alternating current line is the ratio of the sum of the power supply radius of the alternating current line in the alternating current power distribution network to the total number of the alternating current lines in the alternating current power distribution network, wherein the power supply radius of the alternating current line in the alternating current power distribution network refers to the line length from an outgoing line of an alternating current-direct current conversion device to the farthest load point of power supply of the alternating current-direct current conversion device, and the calculation formula is as follows:
(2.1.1.4) calculation of an evaluation index of the average number of segments of the ac line:
the average number of segments of the alternating current line is the ratio of the sum of the number of segments of the alternating current power distribution network to the total number of lines in the alternating current power distribution network, and the calculation formula is as follows:
(2.1.1.5) calculation of the ac line contact rate evaluation index is:
the line connection rate of the alternating current power distribution network is the percentage of the ratio of the sum of the line numbers in the medium voltage alternating current power distribution network with connection to the total line number in the medium voltage alternating current power distribution network, and the calculation formula is as follows:
(2.1.1.6) calculating an alternating-current comprehensive voltage qualification rate evaluation index as follows:
the ac comprehensive voltage qualification rate refers to the percentage of the accumulated running time of the actual running voltage deviation of all nodes in the ac power distribution network within the limit value range and the corresponding total running statistical time when actually running, and the ac comprehensive voltage qualification rate and the ac monitoring point voltage qualification rate are calculated according to the following formulas:
wherein: v is an evaluation index of the qualification rate of the alternating current comprehensive voltage; v (V) A The qualification rate of the A-class alternating current monitoring points is determined; v (V) B The qualification rate of the B-class alternating current monitoring points is determined; v (V) C The qualification rate of the C-type alternating current monitoring points is; v (V) D The qualification rate of the D-class alternating current monitoring points is determined; v (V) i The voltage qualification rate of the A or B or C or D type alternating current monitoring points is determined; t is t up The voltage exceeds the upper limit time; t is t low The voltage exceeds the lower limit time; t is the total operation statistics time;
(2.1.1.7) the calculation of the ac voltage transient dip and short interruption occurrence rate evaluation index is:
the occurrence rate of the instantaneous drop and short-time interruption of the alternating-current voltage refers to the percentage of the number of days when the instantaneous drop or short-time interruption of the voltage occurs at the monitoring points of the alternating-current power distribution network to the total operation statistical number of days at each alternating-current monitoring point, and the calculation formula is as follows:
(2.1.2) calculating evaluation indexes of the direct-current power distribution network, wherein the evaluation indexes are as follows:
(2.1.2.1) calculation of the dc power supply reliability evaluation index is:
the ratio of the difference between the statistical period time and the average power failure time of all users in the direct current power distribution network to the statistical period time is calculated as follows:
(2.1.2.2) calculating the evaluation index of the pass rate of the direct current line N-1 as follows:
the ratio of the sum of the line numbers in the direct current power distribution network of N-1 to the total line number in the direct current power distribution network is satisfied, and the calculation formula is as follows:
(2.1.2.3) calculating an average power supply radius evaluation index of the direct current circuit as follows:
the ratio of the sum of the power supply radiuses of the direct current lines in the direct current distribution network to the total number of the direct current lines in the direct current distribution network, wherein the power supply radiuses of the direct current lines in the direct current distribution network refer to the line length from an outgoing line of an alternating current-direct current conversion device to the farthest load point of power supply of the alternating current-direct current conversion device, and the calculation formula is as follows:
(2.1.2.4) calculating an average segmentation number evaluation index of the direct current line as follows:
the average number of segments of the direct current line is the ratio of the sum of the number of segments of all lines in the direct current power distribution network to the total number of lines in the direct current power distribution network, and the calculation formula is as follows:
(2.1.2.5) calculating a direct current line contact rate evaluation index as follows:
the ratio of the sum of the numbers of the medium voltage direct current lines connected with each other to the total number of the medium voltage direct current lines exists, and the calculation formula is as follows:
(2.1.2.6) calculating a direct-current comprehensive voltage qualification rate evaluation index as follows:
in actual operation, the calculation formulas of the cumulative operation time of the actual operation voltage deviation of all nodes in the direct current power distribution network within the limit value range and the corresponding total operation statistical time are as follows:
wherein: v is the qualification rate of the direct current comprehensive voltage; v (V) A The qualification rate of the class A direct current monitoring point is determined; v (V) B The qualification rate of the B-class direct current monitoring points is determined; v (V) C The qualification rate of the C-type direct current monitoring point is determined; v (V) D The qualification rate of the D-class direct current monitoring point is determined; v (V) i The voltage qualification rate of the class A or B or C or D direct current monitoring point is determined; t is t up The voltage exceeds the upper limit time; t is t low The voltage exceeds the lower limit time; t is the total operation statistics time;
(2.1.2.7) calculating an evaluation index of the occurrence rate of the instantaneous drop of the direct current voltage and the short interruption as follows:
The ratio of the number of days when voltage transient drop or short interruption occurs at the monitoring points of the direct current power distribution network to the total operation statistical number of days of each direct current monitoring point is calculated according to the following formula:
(2.2) calculation of a power supply capability evaluation index, including:
(2.2.1) calculation of evaluation index of alternating-current distribution network, there are
(2.2.1.1) calculating an average value evaluation index of the maximum load factor of the alternating current line:
the ratio of the sum of the maximum load rates of all the alternating current lines to the total number of the alternating current lines in the alternating current distribution network, wherein the maximum load rate of a single alternating current line is the ratio of the annual maximum load of the single alternating current line to the rated transmission power of the single alternating current line, and the calculation formula is as follows:
(2.2.1.2) calculating an average value evaluation index of the maximum load factor of the alternating-current transformer as follows:
the ratio of the sum of the maximum load rates of all transformers to the total number of the transformers in the alternating current distribution network, wherein the maximum load rate of a single alternating current transformer is the ratio of the annual maximum load of the single alternating current transformer to the rated transmission power of the single alternating current transformer, and the calculation formula is as follows:
(2.2.1.3) calculating an alternating current line overload rate evaluation index as follows:
the total number of the heavy-load lines in the alternating-current power distribution network accounts for the proportion of the total number of the lines in the alternating-current power distribution network, wherein the heavy-load lines of the alternating-current power distribution network refer to equipment with the maximum load rate exceeding 80% and the duration exceeding 2 hours, and the calculation formula is as follows:
(2.2.1.4) calculating an evaluation index of the overload rate of the alternating-current transformer:
the proportion of the total number of the heavy-duty transformers in the alternating-current power distribution network to the total number of the transformers in the alternating-current power distribution network, wherein the heavy-duty transformers in the alternating-current power distribution network refer to equipment with the maximum load rate exceeding 80% and the duration exceeding 2 hours, and the calculation formula is as follows:
(2.2.2) calculation of evaluation index of DC Power distribution network, there are
(2.2.2.1) calculating an average value evaluation index of the maximum load factor of the direct current line as follows:
the ratio of the sum of the maximum load rates of all lines to the total number of lines in the direct current power distribution network, wherein the maximum load rate of a single direct current line is the ratio of the annual maximum load of the single direct current line to the rated transmission power of the single direct current line, and the calculation formula is as follows:
(2.2.2.2) calculating an average value evaluation index of the maximum load factor of the direct current transformer as follows:
the ratio of the sum of the maximum load rates of all transformers to the total number of the transformers in the direct current distribution network, wherein the maximum load rate of a single direct current transformer is the ratio of the annual maximum load of the single direct current transformer to the rated transmission power of the single direct current transformer, and the calculation formula is as follows:
(2.2.2.3) calculating a direct current line overload rate evaluation index as follows:
The proportion of the total number of heavy-load lines in the direct-current power distribution network to the total number of lines in the direct-current power distribution network, wherein the heavy-load lines of the direct-current power distribution network refer to equipment with the maximum load rate exceeding 80% and the duration exceeding 2 hours, and the calculation formula is as follows:
(2.2.2.4) calculating the heavy load rate evaluation index of the direct current transformer as follows:
the total number of heavy-load transformers in the direct-current power distribution network accounts for the proportion of the total number of transformers in the direct-current power distribution network, wherein the heavy-load transformers of the direct-current power distribution network refer to equipment with the maximum load rate exceeding 80% and the duration exceeding 2 hours, and the calculation formula is as follows:
(2.2.3) calculation of evaluation index of AC/DC converter, there are
(2.2.3.1) calculating an average value evaluation index of the maximum load factor of the ac/dc converter:
the ratio of the sum of the maximum load rates of all the AC/DC conversion devices to the total number of the AC/DC conversion devices, wherein the maximum load rate of a single AC/DC conversion device is the ratio of the annual maximum load of the single AC/DC conversion device to the rated capacity of the single AC/DC conversion device, and the calculation formula is as follows:
(2.2.3.2) calculating the overload rate evaluation index of the AC/DC conversion device as follows:
the total number of the heavy-load alternating-current/direct-current conversion devices accounts for the proportion of the total number of the alternating-current/direct-current conversion devices, wherein the heavy-load alternating-current/direct-current conversion devices refer to equipment with the maximum load rate exceeding 80% and the duration exceeding 2 hours, and the calculation formula is as follows:
(2.3) calculation of equipment technical level evaluation index, comprising:
(2.3.1) calculation of evaluation index of alternating-current distribution network, there are
(2.3.1.1) calculating a three-remote terminal duty ratio evaluation index of the alternating current switch as follows:
the ratio of the number of switches of the three remote terminals configured in the alternating-current power distribution network to the total number of switches of the automatic distribution terminals configured in the alternating-current power distribution network is calculated as follows:
(2.3.1.2) calculating an alternating-current power distribution automation coverage rate evaluation index as follows:
the proportion of the number of lines of the medium-voltage alternating-current distribution network of the distribution automation terminal to the total number of lines in the medium-voltage alternating-current distribution network is configured, and the calculation formula is as follows:
(2.3.1.3) calculating an ac communication network coverage rate evaluation index as follows:
an average value of the coverage rate of the communication network of the alternating current feeder line and the coverage rate of the communication network of the alternating current station, wherein the coverage rate of the communication network of the feeder line is a ratio of the number of alternating current feeder line terminals covering a communication access network to the total number of the alternating current feeder line terminals; the coverage rate of the station communication network is the ratio of the number of terminals of the alternating current station covering the communication access network to the total number of terminals of the alternating current station, and the calculation formula is as follows:
(2.3.1.4) calculation of the evaluation index of the cable rate of the ac line:
the calculation formula is as follows for the ratio of the sum of the lengths of the alternating current cable lines in the alternating current power distribution network to the total length of the alternating current lines in the alternating current power distribution network:
(2.3.2) calculation of evaluation index of DC Power distribution network, there are
(2.3.2.1) calculating a three-remote terminal duty ratio evaluation index of the direct current switch as follows:
the ratio of the number of switches of the three remote terminals configured in the direct-current distribution network to the total number of switches of the distribution automation terminals configured in the direct-current distribution network is calculated as follows:
(2.3.2.2) calculating an evaluation index of the coverage rate of the direct-current power distribution automation as follows:
the method comprises the steps of configuring the proportion of the number of lines in a medium-voltage direct-current distribution network of a distribution automation terminal to the total number of lines in the medium-voltage direct-current distribution network, and calculating the following formula:
(2.3.2.3) calculating a direct current communication network coverage rate evaluation index as follows:
the method comprises the steps of averaging the coverage rate of a direct current feeder communication network and the coverage rate of a network communicated by a direct current station, wherein the coverage rate of the feeder communication network is the ratio of the number of direct current feeder terminals covering a communication access network to the total number of direct current feeder terminals; the coverage rate of the station communication network is the ratio of the number of terminals of the direct current station covering the communication access network to the total number of terminals of the direct current station, and the calculation formula is as follows:
(2.3.2.4) calculation of the evaluation index of the cable rate of the direct current circuit is as follows:
the ratio of the sum of the lengths of the direct-current cable lines in the direct-current power distribution network to the total length of the direct-current cable lines in the direct-current power distribution network is calculated according to the following formula:
(2.3.3) calculating an evaluation index of the ac/dc conversion device, wherein the calculation of the evaluation index of the coverage rate of the communication network of the ac/dc conversion device is as follows:
the ratio of the number of terminals of the AC/DC conversion device to the total number of terminals of the AC/DC conversion device covering the communication access network is calculated as follows:
(2.4) economic indicators
(2.4.1) calculating an evaluation index of the power supply capacity of the alternating-current power distribution network, which comprises the following steps:
(2.4.1.1) calculation of an average load factor evaluation index of the ac line:
the ratio of the sum of average load rates of all the alternating current lines to the total number of the alternating current lines in the alternating current distribution network, wherein the average load rate of a single alternating current line is the ratio of the total load of the single alternating current line in an evaluation period to the time of the evaluation period, and the calculation formula is as follows:
(2.4.1.2) calculation of an average load factor evaluation index of an ac transformer is:
the ratio of the sum of the average load rates of all the alternating current transformers of the alternating current distribution network to the total number of the alternating current transformers, wherein the average load rate of a single alternating current transformer is the ratio of the total load of the single alternating current transformer in an evaluation period to the time of the evaluation period, and the calculation formula is as follows:
(2.4.1.3) calculating an evaluation index of the comprehensive loss rate of the alternating-current power distribution network as follows:
The difference between the power supply quantity and the sales power quantity of the alternating-current power distribution network accounts for the proportion of the power supply quantity of the alternating-current power distribution network, and the calculation formula is as follows:
(2.4.2) calculation of evaluation index of DC Power distribution network, there are
(2.4.2.1) calculating an average load factor evaluation index of the direct current line as follows:
the ratio of the sum of average load rates of all direct current lines to the total number of the direct current lines in the direct current distribution network, wherein the average load rate of a single direct current line is the ratio of the total load of the single direct current line in an evaluation period to the time of the evaluation period, and the calculation formula is as follows:
(2.4.2.2) calculating an average load factor evaluation index of the direct current transformer as follows:
the ratio of the sum of the average load rates of all the direct current transformers to the total number of the direct current transformers in the direct current distribution network, wherein the average load rate of a single direct current transformer is the ratio of the total load of the single direct current transformer in an evaluation period to the time of the evaluation period, and the calculation formula is as follows:
(2.4.2.3) calculating an evaluation index of the comprehensive loss rate of the direct-current power distribution network as follows:
the difference between the power supply quantity and the sales power quantity in the direct-current power distribution network accounts for the proportion of the power supply quantity in the direct-current power distribution network, and the calculation formula is as follows:
(2.4.3) calculation of evaluation index of AC/DC converter, there are
(2.4.3.1) calculating an average load factor evaluation index of the ac/dc conversion device as follows:
The ratio of the sum of the average load rates of all the AC/DC conversion devices to the total number of the AC/DC conversion devices, wherein the average load rate of a single AC/DC conversion device is the ratio of the total load of the single AC/DC conversion device in an evaluation period to the time of the evaluation period, and the calculation formula is as follows:
(2.4.3.2) calculating an evaluation index of the comprehensive loss rate of the AC/DC conversion device as follows:
the ratio of the difference between the total electric quantity input by the AC/DC conversion device and the total electric quantity output by the AC/DC conversion device to the total electric quantity input by the AC/DC conversion device is calculated as follows:
(2.5) calculation of a source-load development level evaluation index, including:
(2.5.1) calculating an alternating current power distribution network evaluation index, namely calculating a direct current inversion grid-connected power supply permeability evaluation index, wherein the method comprises the following steps:
the ratio of the total installed capacity of the DC power source in the inversion grid connection to the annual maximum load of the AC distribution network is calculated according to the following formula:
(2.5.2) calculating the direct current power distribution network evaluation index, namely calculating the direct current grid-connected power supply permeability evaluation index, wherein the method comprises the following steps:
the ratio of the capacity of the direct current grid-connected power supply to the annual maximum load of the direct current power distribution network is calculated as follows:
(2.5.3) calculating an ac/dc conversion device index evaluation index, which is a calculation of an ac/dc conversion device permeability evaluation index, as follows: the annual maximum load ratio of the AC-DC conversion device capacity and the AC-DC series-parallel power distribution network is calculated by the following formula:
3) Determining the weighting value of the evaluation index comprises the following steps: the membership matrix of the evaluation index is standardized, the specific gravity of the index value of the ith evaluation object under the jth index is calculated, the entropy value of the jth index is calculated, the difference coefficient of the jth index is calculated, and the weight of the jth index is calculated; comprising the following steps:
(3.1) standardization of evaluation index membership matrix
Since the indexes are different in dimension, content and value quality standards, firstly, the index values are standardized, and n evaluation objects correspond to the index values of m evaluation indexes to form a membership degree evaluation matrix R as follows:
wherein r is ij An index value of a j-th evaluation index which is an i-th evaluation target;
(3.2) calculating the specific gravity of the i-th evaluation target index value under the j-th index
Wherein P is ij The specific gravity of the j index which is the i-th evaluation object;
(3.3) calculating the entropy value of the j-th index:
wherein H is j The entropy value of the j index is the entropy value of the j index, and n is the total number of the evaluation objects;
(3.4) calculating a difference coefficient of the j-th index:
α j ＝1-H j
wherein alpha is j A difference coefficient which is the j index;
(3.5) calculating the weight of the j-th index:
wherein omega is j The weight of the j index; m is the total number of evaluation indexes;
4) Comprehensively evaluating the AC/DC series-parallel power distribution network; comprising the following steps:
(5.1) calculating three-level index values of the alternating current-direct current series-parallel power distribution network, selecting an entropy weight method to weight single indexes to obtain weights of all three-level indexes, and carrying out weighted calculation to obtain scores of all two-level indexes;
(5.2) weighting the secondary indexes by using an entropy weight method again to obtain the weight of each secondary index, and obtaining the score of each primary index by weighting calculation;
and (5.3) obtaining the comprehensive score of the regional AC/DC hybrid power distribution network, and giving an evaluation conclusion of the comprehensive effect of the regional AC/DC hybrid power distribution network planning and construction scheme according to the comprehensive score.
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