LIANG Yingyu,LI Wulin,LU Zhengjie,et al.Influence of MMC-HVDC on current phase differential protection of AC line[J].Electric Power Automation Equipment,2019,39(09):95-101.
LIANG Yingyu,LI Wulin,LU Zhengjie,et al.Influence of MMC-HVDC on current phase differential protection of AC line[J].Electric Power Automation Equipment,2019,39(09):95-101.DOI: 10.16081/j.epae.201909033.
Influence of MMC-HVDC on current phase differential protection of AC line
MMC-HVDC(Modular Multilevel Converter based High Voltage Direct Current) is highly controllable and its fault current characteristics are quite different from that of traditional synchronous power supply,which may affect the performance of current phase differential protection. The current expressions of the fault line at both converter station side and grid side are derived,and the fault current characteristics are deeply analyzed. On this basis,the analytical expressions of current phase angle difference between the two sides of fault line are derived under the conditions of single-phase grounding fault and phase-to-phase short circuit fault. The influence of fault type,voltage unbalance degree and power reference value on current phase angle difference of fault line is analyzed. And then the influence mechanism of MMC-HVDC on the performance of current phase differential protection is pointed out. The simulation model is built in PSCAD/EMTDC and the simulative results verify the correctness of the theoretical analysis.
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