基于双级矩阵变换器的直接转矩控制系统

研究了基于双级矩阵变换器的异步电机直接转矩控制策略。传统的直接转矩控制(Direct Torque Control,简称DTC)算法直接施加在双级矩阵变换器的逆变级,而在整流级使用空间矢量调制的方法。在此设计了一种特殊的换流策略,即在整流级换流前后,在逆变级插入零开关状态,保证了整流级的零电流换流特性。该方法结合了DTC和双级矩阵变换器的优点。设计并实现了实验样机系统,实验结果验证了该控制策略的可行性和有效性。

Two-stage Matrix Converter-fed Direct Torque Control Drive

A two-stage matrix converter-fed direct torque control(DTC) strategy for induction motor drive was investigated.The traditional direct torque control scheme was used in the inverter stage,while space vector modulation method was used in the rectifier stage.The feature of zero current switching in the rectifier stage was implemented by inserting short periods of zero switching states around the points at which the rectifier stage commutes.In this way,the characteristics of both di-rect torque control and two-stage matrix control were combined.An experimental prototype was designed.The experimental results are provided to show the feasibility and effectiveness of the proposed strategy.