采用直接转矩控制的矩阵式变换器的仿真

Simulation of Matrix Converter Based on Direct Torque Control

为提高交流调速系统的性能,并且减小对电网的污染,提出了一种将矩阵式变换器与直接转矩控制相结合的组合控制策略.该策略先将矩阵式变换器等效成整流器和逆变器的组合,然后在逆变侧进行直接转矩控制,在整流侧进行电流空间矢量调制,最后将两侧的策略进行综合,并转化成矩阵式变换器9个开关的控制信号.按这种策略进行控制的矩阵式变换器,既可实现对异步电机进行动态性能优良的直接转矩控制,又可获得良好的输入电流波形以及可调的功率因数.仿真结果表明,文中提出的策略不仅可行,而且系统性能优良.

In order to improve the performance of the AC adjustable speed system and reduce the pollution to power network, a compound control strategy that combines matrix converter （MC） with direct torque control （DTC） is proposed. In this strategy, an MC is first transformed into an equivalent topology resulting from the combination of a rectifier and an inverter, then, the DTC and the current space vector modulation are respectively performed on the inverter and the rectifier sides, and the strategies on the two sides are finally synthesized and changed into the control signals of the nine bidirectional switches in MC. The MC controlled by this strategy not only achieves the DTC of asynchronous machine with excellent dynamic performance but also acquires good input currents and an adjustable power factor. Simulated results indicate that the proposed strategy is feasible and excellent.