逆变器供电感应电动机动态性能及低频振荡

DYNAMIC PERFORMANCE AND LOW FREQUENCY OSCILLATION OF INVERTER FED INDUCTION MOTOR

感应电动机变频调速系统已获得广泛应用。为了改善系统运行质量，深入研究动态性能，采用状态变量法，建立了逆变器－感应电动机系统考虑主磁路饱和的数学模型，编制了计算机仿真程序，对系统的动态性能及低频振荡现象进行模拟，模拟结果和实验结果比较一致。模拟及实验结果证明了系统在低频某个频段存在振荡现象。

Variable freguency variable speed system of induction motor has been widely used.In order to improve the system operation guality and analyse system dynamic performance in a thorough going way,by means of state variable method,and allowing for the effect of main magnetic saturation,a nonliner mathematical model of inverterindution motor system is set up.Along with the model,a computer simulation program is worked up,the dynamic performance and low frequency oscillation of this system is simulated. A comparision is made between simulation and experimental results,simulation result is shown to be comparatively relative with the experimental result.Simulation and experimental results proved that system exhibits oscillation in some low frequency region.