Entropy weight method based short-circuit current suppression scheme evaluation method

Abstract

The invention relates to an entropy weight method based short-circuit current suppression scheme evaluation method. The method comprises calculating weights of all current-limiting effect indexes in a power grid short-circuit current suppression scheme through an entropy weight method, establishing an index evaluation matrix according to the indexes, and calculating weights of the indexes after performing standardization processing on the evaluation indexes. By means of the index weight calculation, effects of subjective factors can be prevented effectively, and results are objective and accurate. After index weights are determined through the entropy weight method, evaluation of the power grid short-circuit current suppression scheme is achieved through a distance synthesis method, and the calculated relative proximities of the schemes are sorted for scheme prioritizing. According to the method, the relative significance degree of different current limit effect indexes is considered in a weight mode, the scheme current limit effect is analyzed comprehensively from a plurality of angles, the indexes of different natures and different dimensions in the power grid short-circuit current suppression scheme are synthesized into relative proximity indexes, and evaluation of the power grid short-circuit current suppression scheme is achieved according to values of the indexes.

Description

technical field [0001] The invention relates to an evaluation method in the field of power systems, in particular to an evaluation method for a short-circuit current suppression scheme based on an entropy weight method. Background technique [0002] With the continuous expansion of power grid planning, the grid structure is becoming more and more compact, and the level of short-circuit current is further increasing. The problem of excessive short-circuit current level in some urban power grids has become increasingly prominent. Limiting the level of short-circuit current in the power grid has become an urgent problem to be solved. At present, measures to limit the level of short-circuit current mainly include segmental operation of substation busbars, segmental operation of power grids, and the use of high-impedance transformers and series reactance of lines or busbars. Different short-circuit current limiting measures have different impacts on system safety and economic ope...

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Problems solved by technology

This traditional method of formulating a current limiting scheme is difficult to achieve a comprehensive, comprehensive and objective evaluation of the current limiting scheme

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