Direct torque control system for induction machine fed by space vector modulated matrix converter
空间矢量调制矩阵变换器驱动的异步电机直接转矩控制系统

Matrix converter (MC) has been studied widely for its advantages over the traditional converters. It is gradually employed for applications with its maturity in theoretical studies. A novel control strategy is put forward in this paper, which properly combines the space vector modulation of matrix converter with the direct torque control of induction machine through PI regulation of flux and torque. It improves the control performance of the system effectively, especially for the electric magnetic torque at low speed. This PI regulator is simpler and has better robustness compared with the deadbeat space vector modulation. First, conventional principles of DTC and space vector modulation of matrix converter were described. Then, the combination of the two was given in detail for PI regulator of flux and torque. Third, simulation model was set up for this new type of variable speed system. Finally, the simulation research was carried out for three types of loads. Simulation results have verified the feasibilities and strong adaptability of this novel control strategy, indicating that it is worth further studying.