基于模糊多判据融合的单端暂态量保护新方案OA北大核心CSTPCD

The existing single-terminal transient protection schemes rely solely on single fault feature for fault identification,which leads to the poor identification reliability.This paper thus proposes a novel single-terminal transient protection scheme based on fuzzy multi-criteria fusion to achieve the complementation of the advantages of different single-terminal transient protection schemes through fuzzy multi-criteria fusion.Firstly,the characteristics and action sensitive regions of three single-terminal transient protection schemes,which are based on the ratio of high-and low-frequency transient energy,the arrival time difference of fault initial zero-mode/line-mode voltage traveling wave and the polarity relationship of initial line mode voltage traveling wave,are analyzed,and the fuzzy membership functions of corresponding criteria are constructed.Secondly,based on the advantages and disadvantages of different transient protection schemes,the above three single-terminal transient protection schemes are integrated based on fuzzy logic to achieve fault zone discrimination.Finally,based on a large number of simulation using PSCAD/EMTDC,the three transient protection schemes mentioned above and the proposed novel scheme is compared in terms of adaptability under different fault locations,different bus stray capacitance,different transition resistance and different weight coefficients,which has verified the effectiveness of the proposed novel scheme.