Fault Diagnosis of UHVDC Transmission Lines Based on Improved Directional Current Method

doi:10.11930/j.issn.1004-9649.201803089

Abstract

Abstract: Identifying the faults of UHVDC transmission system reliably and accurately is the basis of protection action inside and outside the UHVDC transmission system, which is of decisive significance to safe and reliable operation of the whole HVDC transmission system. Based on the Berrellon distributed parameter model, a fault identification criterion is proposed by introducing the transient energy deviation (the ratio of transient value to normal value) on the basis of the directional current method, which can identify rectifier outlet fault, DC line fault and inverter outlet fault in UHVDC transmission accurately. This identification method has low requirement for DC line communication channel, strong ability of resisting transition resistance and low requirement for sampling frequency. By building the ±800 kV DC transmission model in PSCAD and combining with the MATLAB, the simulation results show that the method can identify the faults of HVDC system accurately and select the fault poles, which has a certain practical engineering value.

Key words: DC transmission line, distributed parameter model, directional current, transient energy, fault identification

CLC Number:

TM721.1

WANG Yongjin, FAN Yanfang, LI Ziqian. Fault Diagnosis of UHVDC Transmission Lines Based on Improved Directional Current Method[J]. Electric Power, 2019, 52(1): 76-81.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.201803089

https://www.electricpower.com.cn/EN/Y2019/V52/I1/76

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