基于WEMTR的柔性直流输电线路故障测距

doi:10.19595/j.cnki.1000-6753.tces.180121

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Abstract A wavelet-based electromagnetic timereversal (WEMTR) method for locating faults in transmission lines of voltage source converter basedhigh voltage direct current system (VSC-HVDC) is proposed in this paper. This principle, firstly, is to decompose the recorded 1-mode fault currents at the ends of the transmission lines by using wavelet technology. Secondly, the filtered currents are imaged with time axis, which means time reversal. Thirdly, the time reversed currents are set as current sources at the ends of the lossless mirror transmission line. After assuming metallic faults at everywhere of line, the RMSs of assumed fault currents are calculated, and peak value of all RMSs appears at the actual fault location. Theoretically, the proposed method is robust against fault types and fault resistances. A modular multilevel converterbased HVDC system (MMC-HVDC) is established in PSCAD/EMTDC to verify the method, and the transmission line is simulated by frequencyindependent phase model. The results show that, the fault location can be achieved exactly without high sampling rates.

Key words： Wavelet electromagnetic timereversal VSC-HVDC lossless mirror line fault location

Received: 23 January 2018 Published: 31 January 2019

PACS:	TM721.1
	TM75

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	Articles by authors
	Zhang Xipeng
	Tai Nengling
	Zheng Xiaodong
	Huang Wentao
	Sun Kaihua

Cite this article:

Zhang Xipeng,Tai Nengling,Zheng Xiaodong等. Fault Location in VSC-HVDC Transmission Lines Based on WEMTR[J]. Transactions of China Electrotechnical Society, 2019, 34(3): 589-598.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.180121 OR https://dgjsxb.ces-transaction.com/EN/Y2019/V34/I3/589

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