基于有向权重图和复杂网络理论的大型电力系统脆弱性评估

Vulnerability assessment of bulk power grid based on weighted directional graph and complex network theory

提出一种基于有向权重图和复杂网络理论大型电力系统脆弱性评估算法,构建了电网各元件的模型,将系统中各母线而不是传统的变电站定义为网络中的节点;考虑功率在电网中的流动方向,同时计及各元件承受功率扰动的能力,将电网等效为一个有向权重图。基于所建立的模型,对电网采用2种方式进行攻击:随机攻击和蓄意攻击,分析电网在各种攻击下承受扰动的能力,指出了电网中的薄弱节点、薄弱线路。利用所提的方法分析了电力系统在连锁故障下的抗毁性。将该算法应用在中国某一区域电网,取得了较好的效果,验证了算法的有效性。

A vulnerability assessment algorithm of bulk power grid based on weighted, directional graph and complex network theory is proposed with the corresponding models established for the components of power grid, which takes the buses, instead of substations, as the grid nodes, considers the power flow direction in grid and counts in the disturbance tolerance of components to set an equivalent weighted and directional graph of grid. Based on the established models, the disturbance tolerance of power grid is analyzed under random attack and malice attack. The critical buses and lines are indicated. The robustness of power grid under cascading failures is analyzed with the proposed algorithm. Its effectiveness is verified with a real district grid.