考虑容量及电压约束的配电网可靠性评估前推故障扩散法

基于元件优化编号,利用前推故障扩散法仅需数次网络遍历便可确定元件停运的影响范围和隔离范围,枚举故障元件时无需再次遍历网络即可对节点进行分类并累加得到其可靠性指标,证明了算法的时间复杂度为O(N)。根据各元件停运负荷转供路径潮流变化,近似计算相应的容量允许负荷转供率和电压允许负荷转供率,基于节点分支线最大电压降进行快速电压约束校验,提出了考虑设备载流量和节点电压约束的可靠性计算简化模型,无需多次调用完整潮流计算程序。对典型配电网的计算分析表明了所提出的模型算法的有效性和实用性。

Forward Failure Diffusion Algorithm for Reliability Evaluation of Distribution Networks Considering Capacity and Voltage Constraints

Based on the optimal ordering of network elements, the power outage range and isolation range are determined by the forward failure diffusion algorithm including several times of global network ergodic search. The nodes can be classified by enumerating fault elements without more global network search and accumulated to obtain the reliability indices, proving that the time complexity of the algorithm is O(N). According to the current changes through the load transfer path of corresponding outage element, the load transfer rates constrained by capacity and voltage are approximately calculated. Based on the maximum voltage drop of branches, the voltage constraint is conveniently checked. Thus, a simplified reliability evaluation model considering element capacity and node voltage constraints is proposed, with no need to invoke the full power flow calculation program. The validity and effectiveness of the proposed algorithm is verified through calculation and analysis of typical distribution networks.