薄弱断面中关键支路识别有效性验证

Effectiveness Verification of Identification for Key Branch in Weak Section

快速识别大扰动冲击下表征系统稳定状态的关键支路,准确定位系统发生失步的薄弱环节,对制定针对性控制策略,降低系统解列风险具有重要意义。分析了单机无穷大系统受扰后有功功率振荡曲线呈现出的"双峰"轨迹特征,指出该特征与系统稳定裕度之间的关联关系。以此为基础,针对多交流支路输电断面,提出了基于支路电气量单端量测的关键支路快速识别方法。通过实际电网仿真分析,验证了关键支路识别方法及针对性暂态稳定控制的有效性。

As for proposing targeted control strategy and reducing the incidence of system splitting,it is of great significance to rapidly identify key branch whose representation system is in stable state under large disturbance impact and to accurately locate weak section of the system which is out of step. Double peak trajectory characteristics of oscillating curves of active power were analyzed when single-machine infinite-bus system was disturbed,and the authors discovered the relations of such characteristics and margin of power system stability. On such basis,method of fast identification for key branch based on single-end electrical quantities of branch was proposed to deal with multiple AC branch transmission section. After simulation analysis of real power grid,effectiveness of this identification method and targeted transient stability control strategy is verified.