Existing model of distribution system security region is based on interconnections of substation transformers. This model simplifies the detailed topological connections of feeders, which results in that the security boundary cannot match results ofN?1 point-by-point simulation. To solve this problem, this paper firstly proposes a new model of distribution system security region based on interconnections of feeders, which considers both transformerN?1 and feeder N?1 contingency and its result includes load of feeder sections. The model can also be applied to the complex distribution networks with multi-links. Secondly, a parsing algorithm of security region boundary is presented based on the model, and its results are hyperplan expressions formed by set of inequalities. Thirdly, to validate the accuracy of security region model, two kinds ofN?1 simulation proof methods are designed. Results of a study case show that the proposed model can describe distribution security boundary more precisely and rapidly, which can lay a theoretical foundation for precise guidance of secure and efficient operation of distribution system. This work is supported by National Natural Science Foundation of China (No. 51477112).%现有配电网安全域模型都是基于变电站主变互联关系的,且只考虑了主变N?1故障,简化了馈线间的详细拓扑关系,导致所得结果不能完全与N?1仿真一致.为解决这一问题,首先提出了基于馈线互联的配电系统安全域模型,全面计及了主变N?1和线路N?1故障.新模型描述的安全边界可精确到馈线段负荷,并可适用于多联络的复杂配电网.其次,给出了安全域边界的解析算法,边界计算结果为不等式组所形成的超平面表达式.最后,设计了基于N?1仿真的两种验证方法对安全域边界的准确性进行验证.算例表明,该模型能够更准确快速地描述配电网的安全运行区域和N?1安全边界,为安全域方法更精确地指导配电网安全高效运行奠定了理论基础.
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