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该文提出了配电系统安全域(distribution system security region,DSSR)体积的概念与算法,分析了DSSR体积对电网的意义.首先,对DSSR体积进行了定义,DSSR描述了配电系统满足N?1安全的运行范围,体积是DSSR大小的度量.其次,提出了DSSR高效运行区的体积定义.再次,提出了基于蒙特卡罗仿真的DSSR体积算法.最后,通过算例验证了体积算法,并进一步研究了体积的用途.DSSR体积能提供一些最大供电能力(total supply capacity,TSC)无法给出的重要信息,选取TSC相同但DSSR体积不同的电网比较,发现体积大的电网具有更好的安全性能,在各个负荷增长方向上的安全裕量更均衡.该文提出的DSSR体积是反映配电网安全性能的新指标,对未来配电网的规划和运行具有重要的应用价值.“,”This paper proposed the definition and algorithm of distribution system security region (DSSR) volume; and illustrated the meaning of DSSR volume for the grid. First, this paper defined the DSSR volume. DSSR describes the region that contains all operating points of distribution system which meet the N-1 security guidelines. Volume is a measure of the DSSR size. Secondly, the concept of efficient operation region volume was proposed. Thirdly, the algorithm of volume based on Monte-Carlo simulation was proposed. Finally, a case study was provided to verify the algorithm of DSSR volume and study the application of DSSR volume. DSSR volume could provide some critical information that the total supply capacity (TSC) cannot give. We compared two distribution networks of which TSC was the same but DSSR volume was different. It is found that the distribution system whose DSSR volume is bigger have a better security performance; and the safety margin of the distribution network is more balanced in all direction. DSSR volume proposed in this paper is a new index to describe the distribution network security performance; it is of vital significance for the future smart distribution network planning and operation.