基于多支路开断和关键支路集的快速潮流转移识别

Rapid flow transferring identification based on multiple line tripping and key branch set

为快速识别实时潮流转移,基于直流潮流-补偿原理推导了用于快速预估多支路开断后潮流分布的支路开断分布因子(Line Tripping Distribution Factors,LTDF)的计算方法,结合改进的严重度函数,给出了用于评价支路受潮流转移影响程度的过载严重度指标和关键支路集的概念及其求解过程,对单支路或多支路开断同样适用,为后续减载控制策略缩小了分析范围。对New-England 10机39节点系统的算例分析表明,该方法可准确预估开断后潮流,快速有效识别受潮流转移影响严重支路,克服了以往仅用分布因子去评价支路受潮流转移影响程度的不确切性和漏选重要支路的不足,具备合理性、可行性及快速性。

In order to quickly identify flow transferring in real time, line tripping distribution factors （LTDF） based on DC power flow and compensation principle is deduced to estimate the distribution of multi-line tripping power flow quickly, then combining with the improved severity function, the concepts and solving process of key branch set and overload risk indicator used to estimate impact of flow transferring are introduced in detail, which can apply to single line tripping and multi-line tripping equally and reduce analysis range of subsequent load shedding control strategies. The example analyses of 10-generator 39-bus New England System show that the method can estimate tripping power flow accurately, identify the branches severely affected by flow transferring quickly and efficiently, overcome the deficiency ofusing distribution factor to evaluate flow transferring degree and miss-selection of important branch, and has the rationality, feasibility and rapidity.