Traditional pilot differential protection will have the problem of reliability reduction or even failure to operate after the access of new energy stations.To this end,this paper first proposes a rank difference accumulation waveform similarity algorithm and analyzes its anti-interference characteristics.The algorithm measures the similarity of two waveforms by calculating the maximum mismatch degree of two sets of data,which significantly reduces the influence of abnormal data on waveform similarity judgment.On this basis,using the difference of transient current waveform characteristics on both sides of the transmission line,the paper proposes a new pilot protection principle based on 5G communication technology and constructs a complete protection scheme.Finally,the performance of the proposed protection scheme is verified with PSCAD/EMTDC.The simulation results show that the scheme is not limited by the types of new energy and is suitable for all kinds of new energy stations.It has a good ability to resist delay,misoperation,noise,and abnormal data.It also has good operation performance in the cases of weak output of new energy and circuit breaker reclosing on permanent fault.
关键词
新能源/有源配电网/纵联保护/5G通信/波形相似度/暂态电流
Key words
new energy/active distribution network/pilot protection/5G communication/waveform similarity/transient current
维普
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