Control design for a three phase voltage source converter

In this paper, a voltage control strategy to deal with PWM inverter´s control variable saturation is proposed. Limitations of the inverter´s control variables have two important consequences: a reduction of the average torque and important current and voltage ripples. Strategies are analyzed to deal with these problems for a three and a two current loop. As the currents and voltages can no longer be sinusoidal, the goal of the strategy is to maintain them balanced on the whole speed range. Finally, an optimal limitation strategy is implemented in the case of a two current loop structure.