定义于受扰轨迹的电力系统暂态冲击测度

A novel measure of transient impact for power system based on disturbed trajectory

电力系统暂态过程具有复杂时变特征,传统稳定分析大多关注功角关系而无法全面地评价暂态安全水平。基于计入熵权改进的属性测度算法,利用扰动响应轨迹,构造包含电压/频率偏移、振荡程度、暂态能量水平在内的三类共8种测度指标以量化暂态过程中各类参量受扰水平,实现更客观的暂态冲击综合描述。将算法设计为完整、窗口、局部3个模式,以适应不同计算要求和分析重点。16机68节点系统算例表明,算法能在大量纷繁芜杂的轨迹中有效地捕捉暂态冲击关键信息,并进行意义明确的综合分析,有望成为评估电力系统动态安全的新工具。

The complex time-varying characteristic is a significant feature of power system. Traditional stability analysis mainly focuses on relationship between active power and generator angle, which can not assess transient security level comprehensively. Based on attribute measurement theory considering entropy improvement, a novel transient impact measure established by disturbed trajectories is proposed. Eight measure indices, such as voltage and frequency deviation, oscillation status and transient energy volume, included in three categories are proposed to quantify disturbance impact of transient process, which may describe the integrated transient impact more objectively. According to different analysis requirements, three types of algorithm are designed, namely the complete, window and local mode. The demonstration case of 16 generators and 68 buses system illustrates that the proposed methods are able to capture the essential information within transient process effectively, which are expected to be a new series of tools for power system dynamic assessment.