In the distribution network island due to faults,in order to improve the power supply capability of intermit⁃tent power generation for important load,some energy storage system with reasonable power path for load is a solution. This paper proposes an optimal capacity allocation method for energy storage based on island searching strategy. The performance of traditional searching method is improved,which is employed to maximize the load value and obtain the sets of all best power paths in the island structure. In the capacity allocation of energy storage,this paper maximizes the power supply efficiency of energy storage by referring to the sets of best power paths. Moreover,the probability distribu⁃tion of load value supported by energy storage is also determined according to the power output duration curve. The sim⁃ulation example verifies that the proposed method can effectively determine the optimal energy storage capacity when the energy storage capacity per unit supports the maximum load value.%在配电网因故障出现的孤岛内，为提高间歇性电源对重要负荷的供电能力，配置一定容量的储能系统并选择合理的供电路径支撑负荷。该文提出了基于孤岛搜索的有源配电网储能容量优化配置方法。在孤岛搜索中对常规方法改进，求得孤岛拓扑约束下所有使得支撑负荷价值最大的供电路径集合，在储能容量优化配置中结合供电路径最大化储能支撑效果，依据电源出力持续曲线确定储能支撑负荷价值的概率分布。仿真算例验证所提方法能有效确定单位储能出力支撑负荷价值最大时的最佳储能容量。
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