220kv urban ring network partitioning scheme assessment method
A solution evaluation, ring network technology, applied in the direction of instruments, data processing applications, calculations, etc., can solve the problems of subjective or objective evaluation results and neglect of subordinate indicators
Inactive Publication Date: 2015-12-09
SICHUAN UNIV
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[0003] At present, the evaluation of the 220kV urban ring network partition scheme mainly adopts the multi-level fuzzy evaluation model and the principal component analysis method. The former adopts the uncertain expert review method and expert investigation method when determining the weight set, which is greatly affected by human factors. The evaluation results tend to be subjective or objective; the latter is to obtain a small number of comprehensive variables that reflect the information that all indicators can represent through the variance contribution rate, and determine the primary and secondary status of the secondary indicators. When there are many parallel subordinate indicators (the third-level indicators that contain multiple similar attributes inside the second-level indicators are parallel subordinate indicators), the subordinate indicators themselves will also have a primary and secondary status, and some subordinate indicators will be ignored when directly using the principal component analysis method
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[0039] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0040] A 220kV urban ring network partition scheme evaluation method, comprising the following steps:
[0041] Obtain the zoning scheme of 220kV urban ring network;
[0042] Extract the three-phase short-circuit current index and single-phase short-circuit current index at the 220kV bus that is directly related to the 500kV substation, the main transformer "N-1" power flow index of the 500kV substation, and the important line "N-1" power flow index; the important line "N-1" N-1" refers to the research of a certain area in the power grid due to excessive load, resulting in some lines with relatively heavy loads.
[0043] The internal subordinate indicators of the above four types of indicators are extracted and standardized to form a secondary indicator decision matrix R k =(r ij ) n×m ;
[0044] Using information entropy method to R k Int...
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The invention discloses a 220kV urban ring network partitioning scheme assessment method. The method comprises the steps that a 220kV urban ring network partitioning scheme is acquired; a three-phase short-circuit current indicator and a single-phase short-circuit current indicator of a 220kV bus which is directly linked with a 500kV substation and a main substation N-1 trend indicator and an important line N-1 trend indicator of the 500kV substation are extracted; internal subordinate indicators of the four indicators are extracted and standardized to form a secondary indicator decision matrix Rk=(rij) n*m; an information entropy method is used to carry out information entropy processing on the Rk internal indicator information to form a secondary indicator matrix Zn and k; according to the secondary indicator matrix Zn and k, a principal component analysis method is used to calculate a primary comprehensive evaluation indicator value F; and according to the size of the primary comprehensive evaluation indicator value F, the partitioning scheme is assessed. The method provided by the invention has the advantages of objective urban ring network partitioning scheme assessment, small man-made factors and accurate subordinate indicator estimation.
Description
technical field [0001] The invention relates to a method for evaluating a partition scheme of an urban ring network, in particular to a method for evaluating a partition scheme of a 220kV urban ring network based on information entropy and principal component analysis. Background technique [0002] In actual engineering, the evaluation of grid partition scheme refers to the verification of the adaptability of the scheme to the planned power grid by means of power flow calculation under normal conditions, short-circuit current level verification, and static safety analysis. The most adaptable is the optimal partition scheme. [0003] At present, the evaluation of the 220kV urban ring network partition scheme mainly adopts the multi-level fuzzy evaluation model and the principal component analysis method. The former adopts the uncertain expert review method and expert investigation method when determining the weight set, which is greatly affected by human factors. The evaluat...
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Inventor 刘天琪苏学能焦慧明王彪汤凡
Owner SICHUAN UNIV