Direct power control of three-phase boost-type PWM rectifiers with the dead zone of sector borders

The direct power control (DPC) principle of three-phase boost-type PWM rectifiers based on the mathematical model of PWM rectifiers was analyzed. The effect of the hysteresis wide of power hysteresis comparators on the properties of the PWM rectifiers was discussed. Since the hysteresis wide is widened for decreasing switching frequency and energy loss, which causes the pulsation of instantaneous active power and direct current voltage, a control strategy with the dead zone of sector borders was proposed for eliminating the mistakes of selecting switch vectors on sector borders and improving the waveforms of instantaneous active power and direct current voltage. Simulink simulation shows the feasibility of the control strategy.