一种简洁有效的MC-异步电机DTC控制策略研究

Study on a Simple and Effective Strategy of MC-Asynchronous Motor DTC System

该文提出了一种新的矩阵变换器(MC)供电的异步电机直接转矩控制(DTC)策略。MC的虚拟整流环节选择输入电压的最大相和最小相与输出相连接,保证较高的虚拟直流母线电压;虚拟逆变环节采用磁链转矩滞环控制。此控制策略简单,易于实现,MC的开关状态少,系统转矩脉动小。文章利用Matlab对上述控制策略进行了仿真研究,仿真结果验证了控制策略的可行性,结果表明基于该控制策略的系统动态响应快,稳态精度高,有效抑制了电机转矩的脉动,并且对输入电压有较强的鲁棒性。

In this paper,put forward a new strategy of asynch-ronous motor direct torque control（DTC）system fed by matrix converter.Virtual direct part chose two phases of MC＇s input which have the largest and the smallest voltage,so that the virtual direct part has a higher voltage using hysteresis flux-torque control.Simulation study of this strategy based on the Matlab was presented in this paper.The results show that this strategy is feasible,system bases on the new strategy possesses good performance of static and dynamic,and inhibits the motor torque ripple effectively.Under abnormal input voltage conditions,system has strong robustness for input voltage.