TENG Yufei,LI Xiaopeng,CHEN Fufeng,et al.High frequency impedance characteristics of HVDC grounding electrode line under breakage fault and adaptability of impedance monitoring system[J].Electric Power Automation Equipment,2019,39(09):61-66.
TENG Yufei,LI Xiaopeng,CHEN Fufeng,et al.High frequency impedance characteristics of HVDC grounding electrode line under breakage fault and adaptability of impedance monitoring system[J].Electric Power Automation Equipment,2019,39(09):61-66.DOI: 10.16081/j.epae.201909017.
High frequency impedance characteristics of HVDC grounding electrode line under breakage fault and adaptability of impedance monitoring system
Based on the distributed parameter model of transmission line,the high frequency impedance cha-racteristics of HVDC(High Voltage Direct Current) grounding electrode line under breakage fault are deduced and analyzed. When the length of grounding electrode line is longer than the half-wavelength of injected signal,for breakage faults in double transmission lines,the imaginary part of high frequency measured impedance at the head end of the grounding electrode line changes periodicity with fault position,but the variation exceeds the impedance value at normal operation. When the length of grounding electrode line is close to the integer multiple of half-wavelength of the injected signal,the measurement of high frequency impedance is almost equal to that of normal operation,breakage faults at some special position cannot be identified. To improve the reliability of impedance monitoring device,a strategy based on frequency optimization selection for high frequency injected signal is proposed. Based on the measured parameters of line,the injection signal frequency is selected to eliminate the dead band of protection strategy. Finally,an electromagnetic transient simulation model is established in PSCAD according to the parameters of an actual ± 800 kV/8 000 MW UHVDC(Ultra HVDC) system,and the validity of the analysis and conclusion is verified.
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Related Institution
State Key Laboratory of Power Transmission Equipment & System Security and New Technology, School of Electrical Engineering,Chongqing University
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