摘要
针对三相感应电机调压软启动初始时刻不对称过渡过程及电流冲击问题,给出了求解时域电流解析表达式的方法。该方法根据感应电机两相导通时的数学模型,通过频域和时域变换,得到了感应电机初始两相导通时定子电流与电机参数和晶闸管触发角之间的关系,并分析了不同的初始触发角对感应电机定子电流的影响,进而达到精确控制定子电流首半波峰值的目的。以一台2.2kW感应电机为例进行了实测和MATLAB仿真分析对比,验证了电流解析解的正确性。
A method to solve the time-domain current analytical expression is proposed as to the asymmetry of the transition process and the inrush current at the initial time when three-phase induction motor soft-started by an AC voltage controller.Based on the mathematical model when induction motor is switched on two-phase electrical source,through frequency-domain and time-domain transforming,the relationship between stator current and motor parameters,thyristor triggering angle is obtained,and the impact of different triggering angle on stator current of induction motor is analyzed to precisely control its initial half-wave peak value.At the same time,with a 2.2kW induction motor as an example,the correctness of the analytical solution is verified by comparing experiments data with MATLAB simulation results.
出处
《现代电力》
北大核心
2012年第2期50-55,共6页
Modern Electric Power
关键词
感应电机
软起动
冲击电流
晶闸管
解析解
induction motor
soft-starting
inrush current
thyristor
analytical solution
