Principle and Method of Improving Short Circuit Ratio of LCC-HVDC Through VSC-HVDC
Lianghe ZHU , Zhichang YUAN , Chao SHENG , Pandian LUO , Yi LIANG , Fenyan YANG , Rui CHEN , Zhengfu LIU
›› 2017, Vol. 11 ›› Issue (11) : 13 -19.
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Principle and Method of Improving Short Circuit Ratio of LCC-HVDC Through VSC-HVDC
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Abstract
VSC-HVDC has significant influence on LCC-HVDC in hybrid multi-infeed HVDC system. Based on a hybrid dual-infeed HVDC system, the multi-infeed effective short circuit ratio (MIESCR) is deduced which quantitates the improvement effect of infeed point and infeed current of VSC-HVDC to LCC-HVDC. Considering both the normal operation target of VSC-HVDC and the transient voltage compensation needed by LCC-HVDC, a control strategy of VSC-HVDC is proposed which can achieve maximum MIESCR, and its effectiveness is verified through digital simulation in PSCAD.
Keywords
VSC-HVDC / multi-infeed effective short circuit ratio / effective short circuit ratio / hybrid dual-infeed HVDC system
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Funding
the National Key Research and Development Program of China(2017YFB0902301)
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