基于结构保持能量函数的电力系统暂态稳定分析方法研究

Research on Transient Stability Analysis Method of Power System Based on Network Structure Preserving Energy Function

随着新能源占比快速提升、电力电子元件大量接入,电网运行的不确定性快速提升,现有的安全稳定控制模式越来越难以满足电网安全运行需求。该文基于能量函数法的思路,提出一种只需要系统故障响应信息就能够快速分析系统暂态稳定性的方法。首先,构造一种结构保持能量函数,通过逐步积分实时计算系统暂态能量;然后将系统故障响应信息提供给长短时记忆网络,利用训练好的网络实时评估系统临界能量;最后比较故障切除时刻系统的暂态能量与临界能量并据此得到系统稳定性以及稳定裕度信息。在新英格兰10机系统上验证所提方法的准确性与快速性。

With widespread application of renewable energy generation and power electronic equipment in power system,the uncertainty of power system is rapidly increasing.The event-based security and stability control method is increasingly hard to guarantee the secure operation of the power system.Based on the idea of energy function method,a method which could analyze the transient stability only using power system on-fault data was proposed.First,the network structure preserving energy function was built,and the transient energy of power system could be calculated in real time.Then a long-short term memory network was trained and the critical energy could be estimated in real time.Finally the stability margin of power system was obtained with the comparation of transient energy and critical energy.The simulation on New England 10 machine system confirms the rapidity and accuracy of the proposed method.