CN109102196B - Power distribution network diversified load digestion capacity assessment method and system - Google Patents

Power distribution network diversified load digestion capacity assessment method and system Download PDF

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CN109102196B
CN109102196B CN201810958918.5A CN201810958918A CN109102196B CN 109102196 B CN109102196 B CN 109102196B CN 201810958918 A CN201810958918 A CN 201810958918A CN 109102196 B CN109102196 B CN 109102196B
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diversified
power grid
access
load
rationality
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CN109102196A (en
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靳夏宁
瞿艳坤
宋毅
孙充勃
原凯
胡丹蕾
薛振宇
韩丰
李敬如
吴志力
杨卫红
张小斐
耿俊成
蔡超
邵景鑫
邱益林
巩沙东
张汉斌
孟锋
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State Grid Economic And Technological Research Institute Co LtdB412 State Grid Office
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
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State Grid Economic And Technological Research Institute Co LtdB412 State Grid Office
State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Henan Electric Power Co Ltd
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    • G—PHYSICS
    • 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
    • G06Q10/00—Administration; Management
    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
    • G—PHYSICS
    • 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
    • G06Q10/00—Administration; Management
    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0637—Strategic management or analysis, e.g. setting a goal or target of an organisation; Planning actions based on goals; Analysis or evaluation of effectiveness of goals
    • G06Q10/06375—Prediction of business process outcome or impact based on a proposed change
    • G—PHYSICS
    • 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
    • G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
    • G06Q50/06—Electricity, gas or water supply
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S50/00—Market activities related to the operation of systems integrating technologies related to power network operation or related to communication or information technologies
    • Y04S50/16—Energy services, e.g. dispersed generation or demand or load or energy savings aggregation

Abstract

The invention relates to a method and a system for evaluating diversified load absorption capacity of a power distribution network, which comprises the following steps: 1) acquiring regional power grid basic data, and drawing up a diversified load initial access scheme; 2) carrying out layered component division on the regional power grid; 3) establishing a rationality evaluation index system for carrying out rationality evaluation on the layered component power grid; 4) building a calculation model to obtain regional power grid operation data based on the layered component division result of the regional power grid, and calculating the rationality score value of the regional power grid after diversified loads are accessed according to a rationality evaluation index system and the power grid operation data; 5) and judging whether the current diversified load access scheme is the maximum consumption capacity scheme, if so, stopping calculation, and otherwise, obtaining the maximum consumption capacity of the regional power grid to the diversified loads through loop iteration. The method can be widely applied to evaluation and optimization work of a power distribution network diversified load grid-connected scheme.

Description

Power distribution network diversified load digestion capacity assessment method and system
Technical Field
The invention relates to the technical field of power distribution network diversified load planning, in particular to a power distribution network diversified load absorption capacity evaluation method and system based on layered component division.
Background
In recent years, with the continuous development of social economy, loads in a power distribution network increasingly present the characteristics of diversity and complexity, and the requirements of different types of loads on the reliability and the power supply quality of a power system are different. The electric vehicle, the energy storage system, the micro-grid system and other multi-load have higher values in the aspects of energy conservation and emission reduction, load management, renewable resource utilization, electric energy quality improvement, system reliability improvement and the like, and make up for the defects of the traditional power distribution network. However, due to the fact that the large-scale multi-load is connected into the power distribution network, the randomness, the difference of connection technologies and the characteristic of 'being both a power supply and a load' have a remarkable effect on the operation and planning of the power distribution network. Therefore, the ability of the power distribution network to absorb multiple loads is scientifically and reasonably evaluated, and becomes a key problem in the planning and operation process of the power distribution network.
At present, the overall situation of regional diversified loads cannot be mastered in power distribution network planning, a mature method and a mature tool for evaluating the consumption of the diversified loads by a power distribution network are lacked, the access of the diversified loads is messy and disordered, and impact is caused on the safe and stable operation of a power grid. Meanwhile, a diversified load rationality evaluation method is lacked, and the application condition of the method is difficult to track and feed back. In order to promote the coordinated development of diversified loads and a power distribution network, guide the planning of the power distribution network and improve the consumption capability of the power distribution network to the diversified loads, research on the calculation aspect of the consumption capability of the diversified loads is urgently needed, and support is provided for scientific and ordered grid connection of the diversified loads.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a method and a system for evaluating the diversified load consumption capability of a power distribution network, which combine with the rationality evaluation of diversified loads, focus on evaluating the consumption capability of a regional power grid and each internal element thereof on diversified loads from the aspect of safety and reliability of power grid operation, and provide theoretical and technical support for the evaluation of a diversified load access scheme and the planning of the regional power grid.
In order to achieve the purpose, the invention adopts the following technical scheme: a power distribution network diversified load digestion capacity assessment method is characterized by comprising the following steps: 1) obtaining basic data such as a model, parameters and operation data of a regional power grid to be accessed with diversified loads, and drawing up an initial access scheme of the diversified loads; 2) acquiring access positions and access scales of diversified loads in an initial access scheme of the diversified loads, and performing layered component division on a regional power grid according to the access scales of the diversified loads; the access scale of the diversified loads comprises access capacity and access voltage grade; 3) establishing a rationality evaluation index system according to the change condition of the running state of the regional power grid before and after the access of diversified loads, and determining index weight of each evaluation index for carrying out rationality evaluation on the hierarchical component power grid; the power grid running state refers to safe running, electric energy quality and energy management when the power grid runs; 4) building a power system calculation model based on the results of dividing the hierarchical elements of the regional power grid in the step 2) and according to the rationality evaluation index system built in the step 3), calculating the change condition and the score of each evaluation index of the regional power grid after the diversified load is accessed, and obtaining the rationality score of the regional power grid after the diversified load is accessed; 5) and judging whether the current diversified load access scheme is the maximum consumption capacity scheme or not according to the obtained rationality score value of the regional power grid, if so, stopping calculation, and otherwise, obtaining the maximum consumption capacity of the regional power grid to the diversified load through loop iteration.
In the step 2), the method for performing hierarchical component division on the regional power grid comprises the following steps: the method comprises the steps of firstly, carrying out hierarchical division on a regional power grid according to different voltage grades, and then, giving weights according to different types and importance of main elements in the voltage grades to obtain a hierarchical division result of the regional power grid.
In the step 3), the rationality evaluation indexes established according to the change conditions of the power grid operation state before and after the access of the diversified loads comprise safe operation indexes, electric energy quality indexes and energy management indexes; the safe operation index comprises that the line or the transformer does not meet the N-1 index, the line or the transformer heavy load increasing rate index, the short-time load rate increasing value index and the short-circuit current exceeding rate index; the electric energy quality indexes comprise a voltage deviation exceeding rate index, a harmonic voltage exceeding rate index and a harmonic current exceeding rate index; the energy management index comprises a peak-to-valley difference rate increase value index and a line loss increase value index.
The calculation formula of each evaluation index is as follows:
safety operation index
a. Does not satisfy the N-1 increase rate:
Figure BDA0001773347880000021
in the formula (I), the compound is shown in the specification,
Figure BDA0001773347880000022
the unit is the increasing rate of the number of the transformers or lines which do not meet the N-1 safety criterion after the access of diversified loads; n isTAiThe number of transformers or lines which do not meet the N-1 safety criterion after the access of diversified loads is determined; n isTBiThe number of transformers or lines which do not meet the N-1 safety criterion before the access of diversified loads is determined; n isTThe number of public transformers or lines of a regional distribution network is evaluated;
b. equipment component heavy load increase rate:
Figure BDA0001773347880000023
in the formula:
Figure BDA0001773347880000024
the unit is the increasing rate of the number of the heavy-load transformers or lines after the access of diversified loads; n isTSAiThe number of the transformers or lines with heavy load after the access of diversified loads; n isTSBiThe number of transformers or lines for the heavy load before the access of the diversified load is as follows: n isTSEvaluating the total number of transformers or lines in the regional power distribution network;
c. short-term load rate increase value:
Figure BDA0001773347880000025
in the formula, x5The unit is the short-time load rate increase value after the access of the diversified load;
Figure BDA0001773347880000026
after the access of diversified loads, the unit of the average load in the time period is megawatt; pAL.maxAfter the access of diversified loads, the unit of the maximum load in the time interval is megawatt;
Figure BDA0001773347880000031
before the access of diversified loads, the unit of the average load in the time period is megawatt; pBL.maxBefore the access of diversified loads, the unit of the maximum load in the time interval is megawatt;
d. short-time current exceeding rate:
Figure BDA0001773347880000032
in the formula: x is the number of6The increase rate of the number of the short-circuit current exceeding nodes after the access of diversified loads is calculated, and the unit is; n is a radical ofSCDGThe number of the nodes which do not meet the requirement after the access of the diversified loads is determined; n is a radical ofSCThe number of the nodes which do not meet the requirement before the access of the diversified loads is determined; n isNOD,ICalculating the number of nodes for evaluating the short-circuit current of the regional distribution network;
② electric energy quality index
a. Voltage variation exceeding rate:
Figure BDA0001773347880000033
in the formula:
Figure BDA0001773347880000034
the unit is that the exceeding rate of voltage deviation, the exceeding rate of voltage fluctuation and flicker, and the exceeding rate of voltage unbalance after the access of diversified loads; n isTCAiVoltage deviation, voltage fluctuation and flicker, or voltage, after connection of diversified loadsThe number of nodes with unbalancedness which cannot meet the requirement; n isTCBiBefore the access of diversified loads, the number of nodes with voltage deviation, voltage fluctuation and flicker or the number of nodes with voltage unbalance degree which cannot meet the requirements is increased; n isTCEvaluating the total number of the nodes in the area;
b. harmonic abnormal over-standard rate:
Figure BDA0001773347880000035
in the formula, KUThe harmonic voltage exceeding rate or the harmonic current exceeding rate is obtained after the access of diversified loads, and the unit is; n isVdAiThe number of nodes of which the harmonic voltage or the harmonic current does not meet the requirement after the diversified loads are connected; n isVdBiAccessing the number of nodes of which the harmonic voltage or the harmonic current does not meet the requirement before the diversified loads are connected; n isNODEvaluating the number of the nodes of the regional power distribution network;
third energy management index
a. Peak-to-valley difference rate increase value:
Figure BDA0001773347880000036
in the formula: x is the number of12The unit is the peak-to-valley difference rate increase value after the access of diversified loads; pPVDAEvaluating the peak-valley difference of the area after accessing diversified loads, wherein the unit is megawatt; pPVDAMEvaluating the maximum value of the regional load after accessing the diversified load, wherein the unit is megawatt; pPVDBEvaluating the peak-valley difference of the area before accessing diversified loads, wherein the unit is megawatt; pPVDBMThe maximum load value of the area is evaluated before the access of diversified loads, and the unit is megawatt.
b. Line loss increase value:
x13＝LA-LB，
in the formula: x is the number of13The unit is the added value of the line loss rate after the access of diversified loads; l isAThe line loss rate after the access of diversified loads is obtained; l isBThe line loss rate before the access of diversified loads.
In the step 3), the index weights of all the evaluation indexes are determined according to the importance conditions of all the subarea power grids and the evaluation indexes, and the sum of all the evaluation index weights is 1; the establishment principle of the scoring formula of each evaluation index is as follows: after the access of diversified loads, if the standard exceeding condition corresponding to the evaluation index is increased, the score is negative; and if the overproof condition corresponding to the evaluation index is reduced, the score is positive.
In the step 4), the method for evaluating the rationality score value of the regional power grid comprises the following steps:
4.1) calculating to obtain the rationality score value of the power grid element according to each evaluation index score and index weight of each element of the power grid with different voltage grades;
the calculation formula of the component rationality score value of each grade of power grid is as follows:
Figure BDA0001773347880000041
in the formula: m is the consumption rationality score of the power distribution networks with different voltage grades; y isiThe k-th specific index value of the power distribution network is obtained; w is aiThe weight of the kth specific index of the power distribution network is obtained;
4.2) carrying out weighted accumulation on the rationality score values of the power grids in different voltage classes to obtain the rationality score values of the power grids in each voltage class, wherein the calculation formula is as follows:
Figure BDA0001773347880000042
in the formula: miThe evaluation value is the rationality evaluation value of the voltage grade power grid element with the sequence number i; wi jThe voltage class is numbered i, the layering is numbered AjThe rationality scoring weight of the partitioned power grid;
4.3) carrying out weighted accumulation on the rationality score values of the power grids of all the voltage classes to obtain the rationality score values of the regional power grids; the calculation formula is as follows:
Figure BDA0001773347880000043
in the formula: mAREAScoring the rationality of the regional power grid after the access of diversified loads; n is the number of different voltage grades evaluated by the regional power grid, and n is less than or equal to 5; wiAnd the voltage level serial number is the rationality index weight of the voltage level power grid with i.
In the step 5), the method for judging whether the regional power grid has the diversified load-shedding capacity according to the obtained rationality score value of the regional power grid comprises the following steps:
if the rationality score value is greater than 0, the evaluation result is 'strong digestion capability';
if the rationality score value is equal to 0 point, the evaluation result is 'with digestion capability';
if the rationality score is 0 or less, the evaluation result is "no digestion ability".
In the step 5), the maximum consumption capability refers to the maximum capacity of the diversified loads consumed by the regional power grid under the condition of meeting safe and reliable operation conditions, that is, when the rationality score of the regional power grid is 0, the corresponding diversified loads are accessed to the capacity.
In the step 5), the method for obtaining the maximum absorption capacity of the regional power grid for the diversified loads through the loop iteration comprises the following steps:
5.1) judging whether the current reasonableness score calculation is the first iteration: if the current regional power grid is subjected to the first iteration, judging whether the obtained rationality score value of the current regional power grid is 0, and if the obtained rationality score value of the current regional power grid is 0, determining the corresponding diversified load access capacity in the diversified load access scheme as the maximum absorption capacity of the regional power grid; if not, entering step 5.3);
5.2) if the current regional power grid is not the first iteration, judging whether the rationality score value of the last regional power grid and the rationality score value of the current regional power grid are respectively positive and negative;
if the judgment result is positive, namely the rationality score value of the regional power grid at the last time and the rationality score value of the current regional power grid are respectively positive and negative, when the rationality score value of the regional power grid is 0, the corresponding diversified load access capacity is obtained by adopting a linear interpolation method, and the diversified load access capacity is the maximum absorption capacity of the regional power grid;
if the judgment result is negative, entering the step 5.3);
5.3) judging whether the rationality score value of the current regional power grid is greater than 0:
if the judgment result is yes, namely the rationality score value of the current regional power grid is larger than 0, the regional power grid has enough absorption capacity, and the adjustment proportion S is setkIs positive according to the adjustment ratio SkTo increase the diversified load access capacity Fk+1＝Fk×(1+Sk) Then, returning to the step 4) to carry out iteration again;
if the judgment result is negative, namely the rationality score value of the current regional power grid is smaller than 0, entering the step 5.4);
5.4) under the condition that the access capacity of the diversified loads is not changed, judging whether the diversified load access scheme can be adjusted again;
the specific judging method comprises the following steps: under the condition that the access capacity of the diversified load is not changed, adjusting and perfecting a diversified load planning access scheme aiming at weak links with insufficient rationality according to a rationality evaluation result, and then returning to the step 4) to perform rationality evaluation again; if the adjusted regional power grid still does not have a consumption condition for the diversified load access scheme, namely the rationality score value is still less than 0, the diversified load access scheme cannot be adjusted;
if the diversified load access scheme can not be adjusted any more, an adjustment ratio S is setkIs negative, according to the adjustment proportion SkTo reduce the diversified load access capacity Fk+1＝Fk×(1+Sk) And returning to the step 4) to perform iteration again, and finally obtaining the maximum consumption capacity of the regional power grid.
The utility model provides a distribution network pluralism load digestion ability evaluation system which characterized in that: it includes: the data acquisition module is used for acquiring basic data of a regional power grid to be accessed with diversified loads and drawing up an initial access scheme of the diversified loads; the hierarchical component division module is used for acquiring the access position and scale of the diversified loads according to the proposed diversified load initial access scheme and the range of the regional power grid, and performing hierarchical component division on the regional power grid; the evaluation index building module is used for building a rationality evaluation index system according to the change condition of the running state of the regional power grid before and after the access of diversified loads; the rationality score value calculation module is used for building a calculation model according to the results of the hierarchical component division of the regional power grid to obtain regional power grid operation data, and further calculating each evaluation index score and index weight of the regional power grid after the diversified loads are accessed according to the built rationality evaluation index system to obtain the rationality score value of the regional power grid after the diversified loads are accessed; and the rationality evaluation module is used for carrying out rationality evaluation on the current diversified load access scheme according to the rationality score value of the regional power grid after diversified load access, and obtaining the maximum consumption capacity of the regional power grid on the diversified load through loop iteration.
Due to the adoption of the technical scheme, the invention has the following advantages: 1. according to the method, a power grid object to be evaluated is hierarchically divided by adopting a layered element division idea, a regional power grid is hierarchically divided by elements according to the access capacity and the access voltage level of diversified loads, the evaluation range of the power grid is further determined, the rationality evaluation is accurate to the equipment elements of the power grids of different levels, the absorption capacity of each equipment element of the power distribution network to the diversified loads is accurately mastered, the absorption capacity improvement bottleneck is determined, and the actual construction and transformation work is guided. 2. According to the method, the variation of each running state of the power grid before and after the access of the diversified loads is used as a rationality analysis evaluation index to reflect the influence of the access of the diversified loads on the power distribution network, and the rationality of the power grid on the diversified loads is evaluated by adopting a quantized index system, so that the coordination of the diversified loads and the power distribution network can be accurately reflected. 3. The method adopts a method of trial and interpolation when solving the maximum consumption capacity of the diversified load, carries out cycle iteration on the scheme with the consumption capacity, readjusts the scheme without the consumption capacity, and has simpler and easier calculation in the solving process and stronger operability and engineering practicability. 4. When the rationality of the regional power grid after being connected with diversified loads is evaluated according to the rationality evaluation index system, the physical operation condition of the power grid is emphasized, and the management requirements of power grid enterprises are weakened, so that the calculation result is more in line with the requirements of safe operation and power quality of the power grid. Therefore, the method can be widely applied to the calculation of the diversified load absorption capacity of the power distribution network, and provides support for scientific and ordered access of diversified loads.
Detailed Description
The present invention will be described in detail with reference to examples.
The invention provides a power distribution network diversified load digestion capability assessment method, which comprises the following steps:
1) obtaining basic data such as a model, model parameters, operation data and the like of a regional power grid to be accessed with diversified loads, and drawing up an initial access scheme of the diversified loads;
2) according to the access position and the access scale of the diversified load in the diversified load initial access scheme, and according to the access scale of the diversified load, carrying out layered component division on a regional power grid to be accessed with the diversified load, wherein the access scale of the diversified load comprises parameters such as access capacity and access voltage grade;
3) establishing a rationality evaluation index system according to the change condition of the running state of the regional power grid before and after the access of diversified loads, and determining index weight for carrying out rationality evaluation on the hierarchical component power grid; the power grid running state refers to safe running, electric energy quality and energy management when the power grid runs;
4) building a power system calculation model based on the results of the hierarchical component division of the regional power grid in the step 2) and the rationality evaluation index system built in the step 3), and calculating the change condition and score of each evaluation index of the regional power grid after the access of diversified loads to obtain the rationality score of the regional power grid after the access of the diversified loads;
5) evaluating each diversified load initial access scheme according to the obtained rationality score value of the regional power grid;
6) and judging whether the current diversified load access schemes are maximum load-absorbing capacity schemes or not on the basis of the obtained rationality score value of the regional power grid, if so, stopping calculation, and otherwise, obtaining the maximum load-absorbing capacity of the regional power grid to the diversified loads through loop iteration.
In the step 2), the method for performing hierarchical component division on the regional power grid according to the diversified load access scale and the power grid range in the proposed diversified load access scheme comprises the following steps: the method comprises the steps of firstly, carrying out hierarchical division on a regional power grid according to different voltage grades, and then, giving weights according to different types and importance of main elements in the voltage grades to obtain a hierarchical division result of the regional power grid.
In the step 3), the rationality evaluation index system established according to the change condition of the regional power grid operation state before and after the access of the diversified loads comprises a rationality evaluation index, a rationality evaluation index weight and a rationality evaluation index scoring formula. The rationality evaluation index comprises a safe operation index, an electric energy quality index and an energy management index. The safe operation indexes comprise that the line or the transformer does not meet the N-1 index, the line or the transformer heavy (over) load increasing rate index, the short-time load rate increasing value index and the short-circuit current exceeding rate index; the electric energy quality indexes comprise a voltage deviation exceeding rate index, a harmonic voltage exceeding rate index and a harmonic current exceeding rate index; the energy management index includes a peak-to-valley difference rate increase value index and a line loss increase value index. Specifically, the calculation formula of each evaluation index is as follows:
safety operation index
a. The increasing rate of the number of the elements which do not meet the N-1 increasing rate, namely the increasing rate of the number of the elements of which the transformer and the line do not meet the N-1 safety criterion after the diversified loads are connected, is calculated by the following formula:
Figure BDA0001773347880000071
in the formula (I), the compound is shown in the specification,
Figure BDA0001773347880000072
for diversifying the loadRate of increase of number of transformers or lines not meeting the N-1 safety criterion after switching in, i.e. x1Or x2In units of%; n isTAiThe number of transformers or lines which do not meet the N-1 safety criterion after the access of diversified loads is determined; n isTBiThe number of transformers or lines which do not meet the N-1 safety criterion before the access of diversified loads is determined; n isTThe number of public transformers or lines of a regional distribution network is evaluated;
b. the heavy (overload) load increasing rate of the equipment element, namely the increasing rate of the number of the heavy (overload) load transformers and lines after the access of diversified loads, is calculated by the following formula:
Figure BDA0001773347880000073
in the formula:
Figure BDA0001773347880000074
rate of increase of number of transformers or lines heavily (over) loaded after access for diversified loads, i.e. x3Or x4In units of%; n isTSAiThe number of heavy (over) loaded transformers or lines after the access of diversified loads; n isTSBiThe number of transformers or lines with heavy (over) loads before access for diversified loads: n isTSEvaluating the total number of transformers or lines in the regional power distribution network;
c. the short-time load rate increase value is the increase value of the ratio of the average load to the maximum load in a short time after the access of diversified loads, and the calculation formula is as follows:
Figure BDA0001773347880000081
in the formula, x5The unit is the short-time load rate increase value after the access of the diversified load;
Figure BDA0001773347880000082
after the access of diversified loads, the unit of the average load in the time period is megawatt; pAL.maxAfter the access of diversified loads, the time interval is the mostLarge load, unit is megawatt;
Figure BDA0001773347880000083
before the access of diversified loads, the unit of the average load in the time period is megawatt; pBL.maxBefore the access of diversified loads, the unit of the maximum load in the time interval is megawatt;
d. the short-time current exceeding rate means the rate of increasing the number of nodes with short-circuit current not meeting the requirement after the access of diversified loads, the operation mode with the most serious influence on the short-circuit current of the power grid caused by the access of the diversified loads is considered in the index calculation, and the calculation formula is as follows:
Figure BDA0001773347880000084
in the formula: x is the number of6The increase rate of the number of the short-circuit current exceeding nodes after the access of diversified loads is calculated, and the unit is; n is a radical ofSCDGThe number of the nodes which do not meet the requirement after the access of the diversified loads is determined; n is a radical ofSCThe number of the nodes which do not meet the requirement before the access of the diversified loads is determined; n isNOD,ICalculating the number of nodes for evaluating the short-circuit current of the regional distribution network;
② electric energy quality index
a. The voltage variation exceeding rate, namely the voltage deviation exceeding rate, the voltage fluctuation exceeding rate, the flicker exceeding rate and the voltage unbalance exceeding rate after the intervention of diversified loads, and the calculation formula is as follows:
Figure BDA0001773347880000085
in the formula:
Figure BDA0001773347880000086
the method is characterized in that the method is used for the exceeding rate of voltage deviation, the exceeding rate of voltage fluctuation and flicker and the exceeding rate of voltage unbalance after the access of diversified loads, namely x7，x8Or x9In units of%; n isTCAiVoltage deviation, voltage fluctuation and flicker, or voltage unevenness after the connection of diversified loadsThe number of nodes with the scale which cannot meet the requirement; n isTCBiBefore the access of diversified loads, the number of nodes with voltage deviation, voltage fluctuation and flicker or the number of nodes with voltage unbalance degree which cannot meet the requirements is increased; n isTCEvaluating the total number of the nodes in the area;
b. the harmonic abnormal action exceeding rate, namely after the intervention of diversified loads, the harmonic voltage exceeding rate and the harmonic current exceeding rate, and the calculation formula is as follows:
Figure BDA0001773347880000087
in the formula, KUThe harmonic voltage exceeding rate or the harmonic current exceeding rate after the access of diversified loads, namely x10Or x11In units of%; n isVdAiThe number of nodes of which the harmonic voltage or the harmonic current does not meet the requirement after the diversified loads are connected; n isVdBiAccessing the number of nodes of which the harmonic voltage or the harmonic current does not meet the requirement before the diversified loads are connected; n isNODEvaluating the number of the nodes of the regional power distribution network;
third energy management index
a. The peak-valley rate increase value is the difference between the peak-valley rate and the peak-valley rate before the access within a certain period of time after the access of diversified loads, and the calculation formula is as follows:
Figure BDA0001773347880000091
in the formula: x is the number of12The unit is the peak-to-valley difference rate increase value after the access of diversified loads; pPVDAEvaluating the peak-valley difference of the area after accessing diversified loads, wherein the unit is megawatt; pPVDAMEvaluating the maximum value of the regional load after accessing the diversified load, wherein the unit is megawatt; pPVDBEvaluating the peak-valley difference of the area before accessing diversified loads, wherein the unit is megawatt; pPVDBMThe maximum load value of the area is evaluated before the access of diversified loads, and the unit is megawatt.
b. The line loss added value is the difference between the line loss rate after the access of diversified loads and the line loss rate before the access, and the calculation formula is as follows:
x13＝LA-LB (8)
in the formula: x is the number of13The unit is the added value of the line loss rate after the access of diversified loads; l isAThe line loss rate after the access of diversified loads is obtained; l isBThe line loss rate before the access of diversified loads.
The index weights of all the evaluation indexes are determined according to the importance conditions of all the hierarchical power grids and the evaluation indexes, and the sum of all the evaluation index weights is 1; the establishment principle of the scoring formula of each evaluation index is as follows: after the access of diversified loads, if the standard exceeding condition corresponding to the evaluation index is increased, the score is negative; and if the overproof condition corresponding to the evaluation index is reduced, the score is positive. Table 1 below shows the index weight and the score formula for each evaluation index.
TABLE 1 evaluation index and evaluation criteria for reasonability of digestion
Figure BDA0001773347880000092
Figure BDA0001773347880000101
In the step 4), the principle of regional power grid rationality evaluation is as follows: emphasizes the physical operation condition of the power grid, weakens the management requirements of power grid enterprises, namely the lower limit of the rationality evaluation value of the regional power grid is determined by the evaluation value of a safe operation index or a power quality index, and the energy management index is only used as an auxiliary evaluation to participate in the rationality evaluation of the regional power grid. Specifically, the rationality evaluation of the regional power grid comprises the following steps:
4.1) calculating to obtain the rationality score value of the power grid element according to each evaluation index score and index weight of each element of the power grid with different voltage grades;
the calculation formula of the component rationality score value of each grade of power grid is as follows:
Figure BDA0001773347880000102
in the formula: m is the consumption rationality score of the power distribution networks with different voltage grades; y isiThe k-th specific index value of the power distribution network is obtained; w is aiThe weight of the kth specific index of the power distribution network is obtained; because the energy management index is closely related to the power grid enterprise operation, the invention focuses on objectively and truly reflecting the physical operation condition of the power grid and weakening the weight of the related index of enterprise operation, so when the reasonability of elements of the power grid of each grade is evaluated, the negative influence of the enterprise operation on the access of diversified loads to the power grid is reduced, and the peak-valley difference rate increment value and the line loss increment value index are not considered;
4.2) carrying out weighted accumulation on the rationality score values of the power grids in different voltage classes to obtain the rationality score values of the power grids in each voltage class, wherein the calculation formula is as follows:
Figure BDA0001773347880000103
in the formula: miThe evaluation value is the rationality evaluation value of the voltage grade power grid element with the sequence number i; wi jThe voltage class is numbered i, the layering is numbered AjThe rationality scoring weight of the partitioned power grid;
4.3) carrying out weighted accumulation on the rationality score values of the power grids of all the voltage classes to obtain the rationality score values of the regional power grids; the calculation formula is as follows:
Figure BDA0001773347880000111
in the formula: mAREAScoring the rationality of the regional power grid after the access of diversified loads; n is the number of different voltage grades evaluated by the regional power grid, and n is less than or equal to 5; wiAnd the voltage level serial number is the rationality index weight of the voltage level power grid with i.
In the step 5), the method for judging whether the regional power grid has the capacity of consuming diversified loads according to the obtained rationality score value of the regional power grid comprises the following steps:
if the rationality score value is greater than 0, the evaluation result is 'strong digestion capability';
if the rationality score value is equal to 0 point, the evaluation result is 'with digestion capability';
if the rationality score is 0 or less, the evaluation result is "no digestion ability".
In the step 5), the maximum absorption capacity refers to a maximum specification of diversified loads that can be absorbed by the regional power grid under the condition of meeting safe and reliable operation conditions, that is, when the rationality score of the regional power grid is 0, the corresponding diversified loads are accessed to the capacity.
In the step 6), the method for obtaining the maximum capacity of the regional power grid for absorbing the diversified loads through the loop iteration comprises the following steps:
6.1) judging whether the current reasonableness score calculation is the first iteration: if the current regional power grid is subjected to the first iteration, judging whether the obtained rationality score value of the current regional power grid is 0, and if the obtained rationality score value of the current regional power grid is 0, determining the corresponding diversified load access capacity in the diversified load access scheme as the maximum absorption capacity of the regional power grid; if not, entering step 6.3);
6.2) if the current regional power grid is not the first iteration, judging whether the rationality score value of the last regional power grid and the rationality score value of the current regional power grid are respectively positive and negative; if the judgment result is positive, namely the rationality score value of the regional power grid at the last time and the rationality score value of the current regional power grid are respectively positive and negative, when the rationality score value of the regional power grid is 0, the corresponding diversified load access capacity is obtained by adopting a linear interpolation method, and the diversified load access capacity is the maximum absorption capacity of the regional power grid; if the judgment result is negative, entering the step 6.3);
6.3) judging whether the rationality score value of the current regional power grid is greater than 0: if the judgment result is yes, namely the rationality score value of the current regional power grid is larger than 0, the regional power grid has enough absorption capacity, and the adjustment proportion S is setkIs positive according to the adjustment ratio SkTo increase the diversified load access capacity CAPk＝CAPk×(1+Sk) Then, returning to the step 4) to carry out iteration again; if the judgment result is negative, namely the rationality score value of the current regional power grid is smaller than 0, entering the step 6.4);
6.4) under the condition that the access capacity of the diversified loads is not changed, judging whether the diversified load access scheme can be adjusted again;
the specific judging method comprises the following steps: under the condition that the access capacity of the diversified load is not changed, adjusting and perfecting a diversified load access scheme and a power supply side scheme aiming at weak links with insufficient rationality according to a rationality evaluation result, and then returning to the step 4) for carrying out rationality evaluation again; if the access scheme of the adjusted regional power grid to the diversified loads still does not have a consumption condition, namely the rationality score value is still less than 0, the access scheme of the diversified loads cannot be adjusted; if the diversified load access scheme can not be adjusted any more, an adjustment ratio S is setkIs negative, according to the adjustment proportion SkTo reduce the access capacity of the diversified load in the current diversified load access scheme: CAP (common Place Capacity)k＝CAPk×(1+Sk) And then returning to the step 4) to carry out iteration again, and finally obtaining the maximum consumption capacity of the regional power grid.
The invention also provides a power distribution network diversified load digestion capability evaluation system, which comprises: the data acquisition module is used for acquiring basic data of a regional power grid to be accessed with diversified loads and drawing up an initial access scheme of the diversified loads; the hierarchical component division module is used for acquiring the access position and scale of the diversified loads according to the proposed diversified load initial access scheme and the range of the regional power grid, and performing hierarchical component division on the regional power grid; the evaluation index building module is used for building a rationality evaluation index system according to the change condition of the running state of the regional power grid before and after the access of diversified loads; the rationality score value calculation module is used for building a calculation model according to the results of the hierarchical component division of the regional power grid to obtain regional power grid operation data, and further calculating each evaluation index score and index weight of the regional power grid after the diversified loads are accessed according to the built rationality evaluation index system to obtain the rationality score value of the regional power grid after the diversified loads are accessed; and the rationality evaluation module is used for carrying out rationality evaluation on the current diversified load access scheme according to the rationality score value of the regional power grid after diversified load access, and obtaining the maximum consumption capacity of the regional power grid on the diversified load through loop iteration.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the scope of protection thereof, and although the present application is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: numerous variations, modifications, and equivalents will occur to those skilled in the art upon reading the present application and are within the scope of the claims appended hereto.

Claims (8)

1. A power distribution network diversified load digestion capacity assessment method is characterized by comprising the following steps:
1) acquiring basic data of a regional power grid to be accessed with diversified loads, and drawing up an initial access scheme of the diversified loads; the basic data of the regional power grid comprise a power grid model, model parameters and operation parameters;
2) acquiring the access position and scale of the diversified load in the initial access scheme of the diversified load, and performing layered component division on a regional power grid to be accessed with the diversified load according to the access scale of the diversified load;
3) establishing a rationality evaluation index system for carrying out rationality evaluation on the hierarchical component power grid according to the change condition of the running state of the regional power grid before and after the access of diversified loads, and determining the evaluation index weight; the power grid running state refers to safe running, electric energy quality and energy management when the power grid runs;
in the step 3), the rationality evaluation indexes established according to the change conditions of the power grid operation state before and after the access of the diversified loads comprise safe operation indexes, electric energy quality indexes and energy management indexes; the safe operation indexes comprise that the line or the transformer does not meet the N-1 index, the line or the transformer heavy load increasing rate index, the short-time load rate increasing value index and the short-circuit current exceeding rate index; the electric energy quality indexes comprise a voltage deviation exceeding rate index, a harmonic voltage exceeding rate index and a harmonic current exceeding rate index; the energy management indexes comprise a peak-to-valley difference rate increase value index and a line loss increase value index;
the calculation formula of each evaluation index is as follows:
safety operation index
a. Does not satisfy the N-1 increase rate:
Figure FDA0003376501020000011
in the formula (I), the compound is shown in the specification,
Figure FDA0003376501020000012
the increasing rate of the number of the transformers or lines which do not meet the N-1 safety criterion after the access of diversified loads, namely x1 or x2, is calculated in units; n isTAiThe number of transformers or lines which do not meet the N-1 safety criterion after the access of diversified loads is determined; n isTBiThe number of transformers or lines which do not meet the N-1 safety criterion before the access of diversified loads is determined; n isTThe number of public transformers or lines of a regional distribution network is evaluated;
b. equipment component heavy load increase rate:
Figure FDA0003376501020000013
in the formula:
Figure FDA0003376501020000014
the unit is the increasing rate of the number of the heavy-load transformers or lines after the access of diversified loads; n isTSAiThe number of the transformers or lines with heavy load after the access of diversified loads; n isTSBiThe number of transformers or lines for the heavy load before the access of the diversified load is as follows: n isTSEvaluating the total number of transformers or lines in the regional power distribution network;
c. short-term load rate increase value:
Figure FDA0003376501020000015
in the formula, x5The unit is the short-time load rate increase value after the access of the diversified load;
Figure FDA0003376501020000016
after the access of diversified loads, the unit of the average load in the time period is megawatt; pAL.maxAfter the access of diversified loads, the unit of the maximum load in the time interval is megawatt;
Figure FDA0003376501020000021
before the access of diversified loads, the unit of the average load in the time period is megawatt; pBL.maxBefore the access of diversified loads, the unit of the maximum load in the time interval is megawatt;
d. short-time current exceeding rate:
Figure FDA0003376501020000022
in the formula: x is the number of6The increasing rate of the number of the short-circuit current exceeding nodes after the access of diversified loads is calculated in units of percent; n is a radical ofSCDGThe number of the nodes which do not meet the requirement after the access of the diversified loads is determined; n is a radical ofSCThe number of the nodes which do not meet the requirement before the access of the diversified loads is determined; n isNOD,ICalculating the number of nodes for evaluating the short-circuit current of the regional distribution network;
② electric energy quality index
a. Voltage variation exceeding rate:
Figure FDA0003376501020000023
in the formula:
Figure FDA0003376501020000024
the unit is that the exceeding rate of voltage deviation, the exceeding rate of voltage fluctuation and flicker, and the exceeding rate of voltage unbalance after the access of diversified loads; n isTCAiThe node number is the number of nodes which cannot meet the requirement of voltage deviation, voltage fluctuation and flicker or voltage unbalance after the access of diversified loads; n isTCBiBefore the access of diversified loads, the number of nodes with voltage deviation, voltage fluctuation and flicker or the number of nodes with voltage unbalance degree which cannot meet the requirements is increased; n isTCEvaluating the total number of the nodes in the area;
b. harmonic abnormal over-standard rate:
Figure FDA0003376501020000025
in the formula, KUThe harmonic voltage exceeding rate or the harmonic current exceeding rate is obtained after the access of diversified loads, and the unit is; n isVdAiThe number of nodes of which the harmonic voltage or the harmonic current does not meet the requirement after the diversified loads are connected; n isVdBiAccessing the number of nodes of which the harmonic voltage or the harmonic current does not meet the requirement before the diversified loads are connected; n isNODEvaluating the number of the nodes of the regional power distribution network;
third energy management index
a. Peak-to-valley difference rate increase value:
Figure FDA0003376501020000026
in the formula: x is the number of12The unit is the peak-to-valley difference rate increase value after the access of diversified loads; pPVDAEvaluating the peak-valley difference of the area after accessing diversified loads, wherein the unit is megawatt; pPVDAMEvaluating the maximum value of the regional load after accessing the diversified load, wherein the unit is megawatt; pPVDBEvaluating the peak-valley difference of the area before accessing diversified loads, wherein the unit is megawatt; pPVDBMEvaluating the maximum load value of the area before accessing diversified loads, wherein the unit is megawatt;
b. line loss increase value:
x13＝LA-LB，
in the formula: x is the number of13The unit is the added value of the line loss rate after the access of diversified loads; l isAThe line loss rate after the access of diversified loads is obtained; l isBThe line loss rate before the access of diversified loads;
4) building a power system calculation model based on the access positions of the diversified loads in the step 2), the division results of the layered sub-elements of the regional power grid and the rationality evaluation index system established in the step 3), and calculating the change condition and the score of each evaluation index of each element of each layer of the regional power grid after the diversified loads are accessed to obtain the rationality evaluation value of the regional power grid after the diversified loads are accessed;
5) and evaluating each diversified load initial access scheme according to the obtained rationality score value of the regional power grid.
2. The method according to claim 1, wherein the method further comprises the following steps:
6) and judging whether the current diversified load access scheme is the maximum consumption capacity scheme or not based on the obtained rationality score value of the regional power grid, if so, stopping calculation, otherwise, repeating the steps 1-4), and obtaining the maximum consumption capacity of the regional power grid to the diversified loads through loop iteration.
3. The method for evaluating the diversified load absorbing capacity of the power distribution network according to claim 1, wherein: in the step 2), the method for performing hierarchical component division on the regional power grid comprises the following steps: the method comprises the steps of firstly, carrying out hierarchical division on a regional power grid according to different voltage grades, and then, giving weights according to different types and importance of main elements in the voltage grades to obtain a hierarchical division result of the regional power grid.
4. The method for evaluating the diversified load absorbing capacity of the power distribution network according to claim 1, wherein: in the step 3), the index weights of all the evaluation indexes are determined according to the importance conditions of all the subarea power grids and the evaluation indexes, and the sum of all the evaluation index weights is 1;
the establishment principle of the scoring formula of each evaluation index is as follows: after the access of diversified loads, if the standard exceeding condition corresponding to the evaluation index is increased, the score is negative; and if the overproof condition corresponding to the evaluation index is reduced, the score is positive.
5. The method for evaluating the diversified load absorbing capacity of the power distribution network according to claim 1, wherein: in the step 4), the method for evaluating the rationality score value of the regional power grid comprises the following steps:
4.1) calculating to obtain the rationality score value of the power grid element according to each evaluation index score and index weight of each element of the power grid with different voltage grades;
the calculation formula of the component rationality score value of each grade of power grid is as follows:
Figure FDA0003376501020000031
in the formula: m is the consumption rationality score of the power distribution networks with different voltage grades; y isiThe k-th specific index value of the power distribution network is obtained; w is aiThe weight of the kth specific index of the power distribution network is obtained;
4.2) carrying out weighted accumulation on the rationality score values of the power grids in different voltage classes to obtain the rationality score values of the power grids in each voltage class, wherein the calculation formula is as follows:
Figure FDA0003376501020000041
in the formula: miThe evaluation value is the rationality evaluation value of the voltage grade power grid element with the sequence number i; wi jThe voltage class is numbered i, the layering is numbered AjThe rationality scoring weight of the partitioned power grid;
4.3) carrying out weighted accumulation on the rationality score values of the power grids of all the voltage classes to obtain the rationality score values of the regional power grids; the calculation formula is as follows:
Figure FDA0003376501020000042
in the formula: mAREAScoring the rationality of the regional power grid after the access of diversified loads; n is the number of different voltage grades evaluated by the regional power grid, and n is less than or equal to 5; wiAnd the voltage level serial number is the rationality index weight of the voltage level power grid with i.
6. The method for evaluating the diversified load absorbing capacity of the power distribution network according to claim 1, wherein: in the step 5), the method for judging whether the regional power grid has the diversified load-shedding capacity according to the obtained rationality score value of the regional power grid comprises the following steps:
if the rationality score value is greater than 0, the evaluation result is 'strong digestion capability';
if the rationality score value is equal to 0 point, the evaluation result is 'with digestion capability';
if the rationality score is 0 or less, the evaluation result is "no digestion ability".
7. The method for evaluating the diversified load absorbing capacity of the power distribution network according to claim 2, wherein: in the step 6), the method for obtaining the maximum absorption capacity of the regional power grid for the diversified loads through the loop iteration comprises the following steps:
6.1) judging whether the current reasonableness score calculation is the first iteration: if the current regional power grid is subjected to the first iteration, judging whether the obtained rationality score value of the current regional power grid is 0, and if the obtained rationality score value of the current regional power grid is 0, determining the corresponding diversified load access capacity in the diversified load access scheme as the maximum absorption capacity of the regional power grid; if not, entering step 6.3);
6.2) if the current regional power grid is not the first iteration, judging whether the rationality score value of the last regional power grid and the rationality score value of the current regional power grid are respectively positive and negative;
if the judgment result is positive, namely the rationality score value of the regional power grid at the last time and the rationality score value of the current regional power grid are respectively positive and negative, when the rationality score value of the regional power grid is 0, the corresponding diversified load access capacity is obtained by adopting a linear interpolation method, and the diversified load access capacity is the maximum absorption capacity of the regional power grid;
if the judgment result is negative, entering the step 6.3);
6.3) judging whether the rationality score value of the current regional power grid is greater than 0:
if the judgment result is yes, namely the rationality score value of the current regional power grid is larger than 0, the regional power grid has enough absorption capacity, and the adjustment proportion S is setkIs positive according to the adjustment ratio SkTo increase the diversified load access capacity Fk+1＝Fk×(1+Sk) Then, returning to the step 4) to carry out iteration again;
if the judgment result is negative, namely the rationality score value of the current regional power grid is smaller than 0, entering the step 6.4);
6.4) under the condition that the access capacity of the diversified loads is not changed, judging whether the diversified load access scheme can be adjusted again;
the specific judging method comprises the following steps: under the condition that the access capacity of the diversified load is not changed, adjusting and perfecting a diversified load planning access scheme aiming at weak links with insufficient rationality according to a rationality evaluation result, and then returning to the step 4) to perform rationality evaluation again; if the adjusted regional power grid still does not have a consumption condition for the diversified load access scheme, namely the rationality score value is still less than 0, the diversified load access scheme cannot be adjusted;
if the diversified load access scheme can not be adjusted any more, an adjustment ratio S is setkIs negative, according to the adjustment proportion SkTo reduce the diversified load access capacity Fk+1＝Fk×(1+Sk) And returning to the step 4) to perform iteration again, and finally obtaining the maximum consumption capacity of the regional power grid.
8. A power distribution network diversified load absorbing capacity evaluation system suitable for the method according to any one of claims 1 to 7, wherein: it includes:
the data acquisition module is used for acquiring basic data of a regional power grid to be accessed with diversified loads and drawing up an initial access scheme of the diversified loads;
the hierarchical component division module is used for acquiring the access position and scale of the diversified loads according to the proposed diversified load initial access scheme and the range of the regional power grid, and performing hierarchical component division on the regional power grid;
the evaluation index building module is used for building a rationality evaluation index system according to the change condition of the running state of the regional power grid before and after the access of diversified loads;
the rationality score value calculation module is used for building a calculation model according to the results of the hierarchical component division of the regional power grid to obtain regional power grid operation data, and further calculating each evaluation index score and index weight of the regional power grid after the diversified loads are accessed according to the built rationality evaluation index system to obtain the rationality score value of the regional power grid after the diversified loads are accessed;
and the rationality evaluation module is used for carrying out rationality evaluation on the current diversified load access scheme according to the rationality score value of the regional power grid after diversified load access, and obtaining the maximum consumption capacity of the regional power grid on the diversified load through loop iteration.
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