电压暂降过程中异步电机定子电流计算新方法  

New Calculation Method of Stator Current of Induction Motor During Voltage Sag

作　　者：刘天皓[1] 韩冰[1] 吕盼[2] 张增强[2] 张自力[1] 

机构地区：[1]华北电力大学新能源电力系统国家重点实验室,北京102206 [2]国网新疆电力公司经济技术研究院,乌鲁木齐832001

出　　处：《华北电力大学学报（自然科学版）》2016年第4期47-52,共6页Journal of North China Electric Power University：Natural Science Edition

基　　金：国家自然科学基金资助项目(51077048)

摘　　要：快速、准确地计算电压暂降过程中定子绕组的冲击电流,对于电机安全稳定运行具有实际意义。基于空间向量法,提出一种计算异步电机暂降过程中定子电流的新方法,利用电机空间矢量模型阶数较低的特点,减少状态变量个数,有利于电动机暂降过程中复杂瞬态过程计算的简化,电机轻载时直接推导出解析公式,重载时可以减少状态方程个数,以便利用数值算法求解。搭建5.5 k W异步电机的实验测试平台,对比电压暂降过程中定子电流计算与实测波形,验证文中所提出方法的正确性。Rapid and accurate calculation of impulse current of the stator winding in the voltage sag is of practical significance for safe and stable operation of the motor. Based on the space vector,a new method for calculating stator current of induction motor is presented. As the space vector model of motor has low order,it is easy to reduce the quantity of state variables and simplify the calculation of complex voltage sag of the motor. An analytical formula can be deduced directly when the motor is with light load,while the motor is with heavy load,the number of state equations can be reduced,and thus it will be solved by numerical algorithm. Then,the experimental test platform of one 5. 5 k W induction motor is built. By comparing the calculation of stator current and the practical waveform of the test,the correctness of the proposed method is verified.

关 键 词：电压暂降 空间向量法 异步电机 定子冲击电流 

分 类 号：TM343[电气工程—电机]