Model Predictive Flux Control Based on Synchronous Pulse-Width Modulation

Abstract

The switching frequency of the high-power traction drive is relatively low, and the wide speed range results in a large variation of carrier ratio. Therefore, a hybrid pulse width modulation (PWM) strategy needs to be designed to meet the requirements over the full speed operation. In this paper, the torque control of induction motor drives under low switching frequency is investigated. Combining synchronized space vector PWM schemes with the model predictive flux control, a control strategy is developed that does not require phase compensation of the voltage reference and smooth transition between different PWM modes is achieved. Simulation, hardware-in-the-loop and experimental tests validate the effectiveness of the developed method.