感应电动机模型和机械转矩参数对暂态电压稳定评估的影响  

Influence on assessment of transient voltage stability by induction motor model and mechanical torque parameters

作　　者：李佳[1,2] 刘天琪[1] 李兴源[1] 邢大鹏[2] 何笠[3] 

机构地区：[1]四川大学电气信息学院,四川成都610065 [2]国网四川省电力公司技能培训中心,四川成都610072 [3]国网四川省电力公司电力科学研究院,四川成都610072

出　　处：《电力系统保护与控制》2014年第12期19-24,共6页Power System Protection and Control

摘　　要：基于三阶感应电动机模型,同时考虑机械转矩参数,给出了快速评估法下极限切除时间的计算方法,分析了转子绕组电磁暂态特性和机械转矩参数对极限切除时间的影响。该方法提高了感应电动机模型精度,同时计算更加简便,可用于动态安全评估系统的计算。IEEE30系统仿真结果表明较高的机械转矩次数有利于负荷节点暂态电压稳定,而转子绕组的电磁暂态特性不利于负荷节点的暂态电压稳定,模型精度对极限切除时间的影响小于机械转矩参数的影响。Based on three-order induction motor load model and considering different mechanical torque, a method for calculating critical clearing time under rapid assessment is presented. The effect on critical clearing time by rotor winding electromagnetic transient characteristics and mechanical torque parameters is analyzed. The proposed method improves the accuracy of induction motor load model, and the time index can be calculated more simply so that this method can be used in dynamic security assessment system as a computational engine. The simulation result of IEEE30 bus system shows that the power of mechanical torque benefits the transient voltage stability of load nodes, and the electromagnetic transients in rotor winding harm the transiet voltage stability; the effect of model accuracy on critical clearing time is smaller than that of mechanical torque parameters.

关 键 词：感应电动机模型 机械转矩参数 暂态电压稳定 极限切除时间 

分 类 号：TM346[电气工程—电机]