首页|Hybrid ROCOV/Waveform Similarity Coefficient Based Protection for DC Lines in HVDC Grids
Hybrid ROCOV/Waveform Similarity Coefficient Based Protection for DC Lines in HVDC Grids
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DC line protection with high speed and strong robustness against high fault resistance is essential in high-voltage direct current(HVDC)grids.The conventional voltage-derivative-based protections for DC lines exhibit the problem of low reliability on the occurrence of high-impedance faults.In this paper,fault traveling waves at the fault point and at the line side of the DC reactor are first analyzed using phase-modal transformation.Based on the theoretical analysis of the modal fault-component voltages at the line side of the DC reactor,a novel hybrid protection scheme utilizing the single-ended rate of change of voltage(ROCOV)and waveform similarity coefficient is proposed.It utilizes the hybrid ROCOV criterion and waveform similarity coefficient to identify the faulted line and the amplitudes of the 0-and 1-mode fault-component voltages to identify fault type,and the polarities of the 0-and 1-mode fault-component voltages to identify faulted pole.Simulations under various fault conditions verify that the proposed protection scheme can achieve fast and reliable identification of faulted line,fault type,and faulted pole in 1 ms,and effectively improve the reliability against high-impedance faults up to 1200 Q.
DC line protectionMMC-HVDC gridphase-modal transformationROCOVwaveform similarity coefficient
Wenxia Sima、Zhengzheng Fu、Ming Yang、Tao Yuan、Pan Duan、Potao Sun
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State Key Laboratory of Power Transmission Equipment & System Security and New Technology,Chongqing University,Chongqing 400044,China
School of Automation,Chongqing University of Posts and Telecommunications,Chongqing 400065,China
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