基于支路综合脆弱性的电网抗毁性分析

Power system invulnerability assessment based on branch comprehensive 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,而其中极少数带有较重传输任务的支路往往起到助推作用,因此寻找这些关键支路,分析该部分支路失效情况下的电力系统的抗毁性,具有重要的研究价值。建立支路静态能量函数模型,并在此基础上提出支路状态脆弱因子。结合基于电气介数的结构脆弱因子,提出支路综合脆弱性评估指标。通过仿真计算,评估电网的支路综合脆弱性,确定脆弱环节。基于脆弱性评估结果建立抗毁性评估指标,通过蓄意攻击和随机攻击,仿真验证不同扰动模式对电网抗毁性的影响。通过对IEEE-30母线系统的仿真,验证了该方法的合理性与有效性。

The blackouts usually start from individual components failure which eventually leads to system crash, and a very few branches with heavy load play a promoting role in the tendency, therefore, it is very important to find these key branches, and analyze the system invulnerability under the conditions of branch failures. This paper builds the branch static energy function model and then proposes the branch state vulnerability factor. Combining with the structure vulnerability factor based on electric betweenness, the branch comprehensive vulnerability index is put forward. Through simulating calculation, the branch comprehensive vulnerability is evaluated to confirm the fragile link of power system. On this basis, the invulnerability index is determined. Through intentional attack and random attack, the influence of different disturbance on the network invulnerability is simulated. The simulation on the IEEE-30 bus system verifies the rationality and effectiveness of this method.