Effects of Voltage Sag on the Performance of Induction Motor Based on a New Transient Sequence Component Method

作     者：Dongdong Zhang Tianhao Liu 

作者机构：School of Electrical EngineeringGuangxi UniversityNanning530004China Department of Electrical and Electronic EngineeringUniversity of Hong KongHong Kong999077China 

出 版 物：《CES Transactions on Electrical Machines and Systems》 (中国电工技术学会电机与系统学报（英文）)

年 卷 期：2019年第3卷第3期

页      面：316-324页

学科分类：08[工学] 0812[工学-计算机科学与技术（可授工学、理学学位）] 

基　　金：This work was supported in part by the National Natural Science Foundation of China under Grant51307050 

主　　题：Induction motors instantaneous negative sequence current time-stepping finite element method voltage sag. 

摘      要：Voltage sag is one of the most common power quality disturbances in industry,which causes huge inrush currents in stator windings of induction motors,and adversely impacts the motor secure *** paper firstly introduces a 2D Time-Stepping multi-slice finite element method(2D T-S multi-slice FEM)which is used for calculating the magnetic field distribution in induction motors under different sag *** the paper deduces the transient analytical expression of stator inrush current based on the classical theory of AC motors and presents a separation method for the positive,negative and zero sequence values based on instantaneous *** this method,the paper studies the influences of voltage sag amplitude,phase-angle jump and initial phase angle on the stator positive-and negative-sequence peak currents of 5.5 kW and 55 kW induction *** paper further proposes a motor protection method under voltage sag condition with the stator negative-sequence peak currents as the protection threshold,so that the protection false trip can be avoided ***,the calculation and analysis results are validated by the comparison of calculated and measured stator peak value of the 5.5 kW induction motor.