基于节点脆弱性的电力系统抗毁性分析

Invulnerability Assessment of Power System Based on Node Vulnerability

大停电事故一般由个别元件故障开始并最终导致全系统崩溃,而其中极少数带有重负荷的节点往往起到助推作用,因此寻找这些关键节点,分析该部分节点失效情况下的电力系统的抗毁性,具有重要的研究价值。基于静态能量函数,建立相关的脆弱性评估指标模型,对电力系统的节点脆弱性进行评估,从而确定电力系统的脆弱环节。在此基础上,对电力网络拓扑模型进行蓄意攻击和随机攻击,分析比较电力系统在这两种攻击下的网络抗毁度指标,结合系统能量和网络图论分析研究电力系统的抗毁性。通过对某地区电网的实际仿真,验证了该方法的合理性与有效性。

The blackouts usually start from the individual component failure and eventually lead to system crash, and a very few nodes with heavy load play a promoting role in the tendency, therefore, it is very important to find out these key nodes and analyze the system invulnerability under the conditions of node failures. The relevant vulnerability evaluation index model is established based on the static energy function, and the node vulnerability of power system is evaluated so as to confirm the fragile link of power system. On this basis, the intentional attacks and random attacks to the topology model of power grid are carried out, and then the network invulnerability index during the two types of attacks is analyzed and compared. Finally, the invulnerability of power system is analyzed and studied combining system energy with network graph theory. The rationality and effectiveness of the proposed method are verified by the simulation of the actual regional power grid.