基于广域支路响应的电压失稳主动解列控制

Active Splitting Control of Voltage Instability Based on Wide Area Branches’ Response

电力系统已呈现出加速电力电子化发展的趋势,局部区域电压失稳诱发邻近电网连锁反应的风险加剧。文中首先针对电压稳定分析的典型系统,解析电压失稳过程中节点电压幅值与相位的时空分布规律;其次,以简化支路暂态输电能力sBTTC定量评估指数为特征参量,研究连接于不同两端节点的支路响应差异,在此基础上,提出基于层次聚类的失稳区域互连支路识别和割集搜索方法,以及主动解列控制策略。最后,面向存在电压失稳问题的交直流混联电网实际场景,大扰动仿真结果验证割集搜索的准确性,以及主动解列控制限制电压失稳波及范围和降低连锁反应风险的有效性。

The power system has shown a trend of accelerating the development of power electronics, and the risk of cascading failures of neighboring power grids caused by local power grid voltage instability has increased. Firstly, the temporal and spatial distribution of the node voltage amplitude and phase during voltage instability in a typical source-to-load power transmission system was analyzed. Secondly, the response difference of the branch connected to the nodes at different ends was analyzed, with the simplified branch transient transmission capability(sBTTC) quantitative evaluation index as the characteristic parameter. On this basis,a hierarchical clustering-based method for identifying interconnected branches and cut sets in unstable regions, an active splitting control strategy were also proposed. Finally, for several practical scenarios of AC/DC hybrid power grids with voltage instability problems, the large disturbance simulation results verified the accuracy of the identification of interconnected branches and cut sets, and the effectiveness of active splitting control to reduce the risk of cascading failures.