含分布式电源的配网可靠性概率计算

Computation of Probability Distribution for Reliability Indices of Distribution System Containing Distributed Generation

为提高含分布式电源(distributed generation,DG)的配电网可靠性评估效率,提出了基于网络分区的故障恢复策略;计及DG对配电网可靠性的影响,提出了含DG的配电网可靠性概率分布模型及算法,有效克服了传统期望值指标仅从概率均值意义测度系统风险的不足。基于配网分区分块思想,分别从系统级和节点层对配电网可靠性指标采用随机函数进行表征,结合非参数核密度估计技术,实现了可靠性指标随机函数表达式的概率分布计算。算例结果验证了该方法的有效性。

To improve the reliability evaluation efficiency of distribution network containing distributed generation （DG）, a network partition-based fault recovery strategy is proposed. Considering the influence of DG on distribution network reliability, a probability distribution model for the reliability of distribution network containing DG and corresponding algorithm are put forward, thus the defect of traditional expectation indices that measure system risk only in the meaning of probabilistic mean values is remedied. Based on the thinking of partitioning of distribution network, the reliability indices of distribution network are characterized by random function in system level and nodal hierarchies, and combining with non-parametric kernel density estimation the probability distribution calculation of random function expression for reliability indices is implemented. Simulation results of RBTS-BUS6 system show that the proposed method is effective.