Hydropower resources are abundant in Sichuan, which is the hydropower base of West to East Electricity Transmission Project. By 2012.there will be a world wide unique multi DC transmission system in Sichuan power grid, including ±800kV UHVDC transmission and ±500kV HVDC transmission. Complex interaction needs to be analyzed. The index parameters for multi-infeed HVDC systems have been analyzed. Also, this paper has further defined multi-send operating short circuit ratio (MOSCR) and reduced power influence factor (RPIF). Quantitative analysis of indexes mutual support of DC systems are used to analyze the interaction of multi-send HVDC systems of Sichuan power grid based on 2012 high water level peak load operation mode. The results show that the interaction of DC systems is medium and mutual support can improve the transient stability of sending end systems.%高压直流输电在我国西电东送的战略中作用重大,针对±800kV特高压直流和±500kv高压直流的多回直流外送输电系统复杂的交互影响,分析了多馈入直流量化指标,推广定义了多送出运行短路比(MOSCR)和折算功率影响因子(RPIF),最后利用量化分析指标和直流系统相互支援对2012年丰大运行方式的四川电网多送出直流系统进行交互影响分析,结果表明多送出直流系统交互影响合理,相互支援能提高送端系统暂态稳定性.
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