中文摘要：

电网间的电气联系日趋紧密,多个500 k V变电站短路电流接近或超过断路器遮断容量,严重威胁电网安全。采用背靠背电压源换流器型高压直流输电（voltage source convertor-based high voltage direct current,VSC-HVDC）技术限制短路电流的方案获得业界的关注和认同。在分析VSC-HVDC降低短路电流原理的基础上,建立以短路电流降低综合效果和投资经济性最优为目标的VSC-HVDC多目标优化布点模型,并采用快速非支配排序遗传算法求解;通过多端口网络等值模型约简可行解空间,以提高个体适应度评估速度;基于模糊选择策略获得最优折中分期建设方案。以2015年夏大运行方式的广东电网为算例,验证表明：1）短路电流降低综合效果指标能有效反映限流措施效果和作用范围;2）多端口网络等值能大幅提高算法求解效率;3）综合限流效果与配置点短路电流大小无直接关系。

英文摘要：

Electrical connection between power grids becomes increasingly closer. Short-circuit currents of several 500kVsubstations approach or exceed breaking capability of circuit breakers, seriously threatening safe operation of power grid. Scheme of back-to-back voltage source convertor-based HVDC （VSC-HVDC） technology for short-circuit current limiting attracts more and more attention and gets recognition from power industry. Based on analyzing principle of using VSC-HVDC to reduce short-circuit current, multi-objective optimal allocation model of VSC-HVDC is established with objectives of optimizing comprehensive effects of reducing short-circuit current and investment economy. Non-dominated sorting genetic algorithm-II is employed to solve the proposed model. In order to improve speed of individual fitness evaluation, feasible solution space is reduced with multi-port network equivalent model. Fuzzy selection strategy is used to obtain optimal compromised phased construction scheme. Taking Guangdong power grid’s operational plan in 2015 summer as study case, it is demonstrated that： 1） Comprehensive effect index for reducing short-circuit current can effectively reflect effect and scope of short-circuit current limiting measures. 2） Multi-port network equivalent can improve algorithm efficiency significantly. 3） There is no direct relationship between comprehensive effects for short-circuit current limiting and short-circuit current value at the substation where VSC-HVDC is allocated.