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

矩阵变换器较传统的变换器具有一系列优点而成为研究热点, 随着其理论研究的接近成熟, 逐渐转向应用研究.提出了一种新颖控制策略. 通过磁链和转矩的PI调节, 把矩阵变换器的空间矢量调制与异步电机的直接转矩控制有机地结合起来, 改进了系统的控制性能, 尤其是电磁转矩的低速性能. 这种PI调节器相对简单和具有较强的鲁棒性, 比较无差拍空间矢量调制而言. 本文首先阐述了传统的直接转矩控制原理和矩阵变换器的空间矢量调制,接着利用磁链和转矩的PI调节, 详细论述了两者的结合和实现过程, 并且在此基础上, 建立这种新型交流调速系统的仿真模型, 最后按照3种负载情况进行了仿真研究. 仿真结果验证了这种新颖控制策略的可行性和较强的鲁棒性.

Direct torque control system for induction machine fed by space vector modulated matrix converter

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.