基于过载影响因子的N-2故障快速筛选和排序方法

Fast N-2 Contingency Screening and Ranking Method Based on Line Overload Impact Factor

为了保证大规模互联电网的安全和稳定运行,需要研究适用于继电保护元件动作特性分析和评估的初始故障筛选和排序方法。以N-2故障为分析目标,提出了一种基于过载影响因子的快速故障筛选和排序方法。根据所定义的过载影响因子,将所有待分析故障分成两类并行扫描然后求取并集,再结合行为指标所表征的严重程度对所筛选处的故障进行排序。算例结果表明,所提方法能有效缩小N-2故障集规模,不仅能节省较多计算量,还可避免排序指标固有的片面性及不确定性。

In order to keep the secure and stable operation of large-scale interconnected network,the contingency screening and ranking method,which is necessary for analyzing and evaluating characteristics of relay devices,is in need.Taking the N-2 malfunction as an analysis target,this paper proposed a kind of fast contingency screening and ranking method based on line overload impact factor.According to the defined line overload impact factor,this paper divided the objective contingencies into two categories,got union set after scanning in parallel and ranked the contingency according to the severity indicated by the performance index.The case study results prove that the proposed method could effectively reduce the N-2 malfunction set scale.The computation cost is saved by the proposed method,while the innate defects of the factor-based methods are averted.