基于稳定约束最优潮流方法的“三华”特高压互联电网交直流相互影响分析

North China—Central China—East China UHV interconnected power grid AC/DC interaction analysis based on stability constrained optimal power flow method

为了研究交直流相互作用对三华特高压互联电网安全稳定的影响,给出了一种基于稳定约束最优潮流方法的实用算法。根据实际电网运行经验,结合潮流转移方向、故障元件位置等相关因素,进一步改进算法流程,减少计算量和提高计算效率。应用相应断面潮流暂稳极限计算、切机切载分析、直流紧急功率提升分析的稳定约束最优潮流改进算法对2012年三华特高压互联电网进行了交直流影响计算分析,得到了2012年三华电网的交直流相互影响特性。仿真结果表明,基于稳定约束最优潮流的算法是有效和实用的,交直流相互影响对三华特高压互联电网的稳定特性具有非常重要的作用。

In order to study the impact of AC/DC interaction on security and stability of the North China--Central China--East China （simplified as 3C） UHV power grid, a practical algorithm based on the stability constrained optimal power flow method is proposed. According to the practical power grid operation experience, combined with relative factors such as the power flow transfer direction and the faulted component location, the algorithm calculation process is furtherly modified, the calculation burden is decreased and the calculation efficiency is improved. The 2012 3C UHV interconnected power grid AC/DC interaction calculation and analysis are proceeded applying the stability constrained optimal power flow modified algorithms relating to the interface power flow transient stability limits calculation, the generator trip and load shedding analysis, and the DC emergency power lifting analysis, and the AC/DC interaction characteristics of the 2012 3C power grid are obtained. The simulation results show that the algorithm based on the stability constrained optimal power flow is effective and practical, AC/DC interaction has very significant impact on the stability characteristics of the 3C UHV interconnected power grid.