计及感应电动机的负荷节点暂态电压稳定解析评估方法  

Analytical Assessment of Transient Voltage Stability of Load Bus Considering Induction Motors

作　　者：李立理[1] 陆超[1] 黄志刚[2] 

机构地区：[1]清华大学电机系,北京市100084 [2]澳门大学科技学院,中国澳门

出　　处：《电力系统自动化》2009年第7期1-5,共5页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(50407001,50595413)~~

摘　　要：不利的负荷特性是引起暂态电压稳定问题的主要原因之一,然而目前尚缺乏用来评估负荷节点暂态电压稳定状况的有效方法。针对3阶感应电动机负荷,给出了一种解析方法。通过把负荷节点及其外部系统等效为2节点简化系统,能够计算出各负荷母线在简化系统中的极限切除时间。所获取的极限切除时间指标反映了各负荷节点的暂态电压稳定状况,从而为动态安全评估提供了有效的信息。在多节点系统中的仿真结果验证了所述方法的有效性。The disadvantageous dynamic load characteristic is one of the main reasons causing transient voltage stability. However, for transient voltage stability assessment, most methods still lack effectiveness in evaluating the status of each load bus. In view of third-order induction motor load model, an analytical method for assessing the transient voltage stability on each load bus is presented. In this method, the load bus with the outside system is equivalent to a simplified system with two buses, and the critical clearing time of each load bus can be analytically calculated with this simplified system. The obtained critical clearing time can be treated as an index to assess the transient voltage stability status of each load bus, thus can provide the useful information for dynamic security assessment. The simulation results of a multi-bus power system verify the effectiveness of the stated method.

关 键 词：暂态电压稳定 解析方法 数值积分 感应电动机 极限切除时间 

分 类 号：TM712[电气工程—电力系统及自动化]