基于复杂网络和暂态能量函数的支路暂态脆弱性评估

Branch transient vulnerability assessment based on the complex network and transient energy function

电力系统在遭受大扰动后失稳可能造成严重后果,甚至引发灾难性事故。基于结构保持模型的多机电力系统暂态能量函数求解各支路势能。结合复杂网络的有向电气介数,考虑发电机出力变化对支路潮流的影响,计算出支路的状态脆弱性以及支路在系统结构中的重要程度。最后,基于结构和状态两因子构建了综合脆弱度指标,对电力系统支路的暂态脆弱性进行了综合评估。通过对6机系统进行仿真计算,验证了该方法能够有效地判断故障后系统的脆弱支路以及临界机群。

The consequence of instability after power system subjected to large disturbance is very serious, even leads to catastrophic accidents. This paper uses multi-machine power system transient energy function based on the structure preserving models to get potential energy of each branch. Then combined the directed electric betweenness of complex network which fully considers the impact of generator output changes to branch power flow, branch state vulnerability and the importance of branch in the system are calculated. Finally a comprehensive vulnerability index is built to assess branch transient vulnerability, which considers the state and structure simultaneously. Simulation results on the 6 machine system prove that this method can identify the vulnerable lines and the critical machines effectively.