Closed Loop Control of Three-Phase PWM Rectifier through A Single DC Line Current Sensor

This paper presents a new current control method for three phase pulse width modulation rectifiers using single dc current sensor. Conventional three-phase PFC control requires sensing of at least two input phase currents. The proposed current control method solves the problems of conventional methods by controlling a three phase PWM rectifier using only the dc-rail current as the feedback signal. The speed of a DC motor can be controlled by varying the duty cycle of the switches. The control circuit can be implemented using a DSPIC30F2010 controller which improves the power factor and reduces the harmonic distortion. Finally the circuit can be tested by driving a DC motor. Keywords-Current sensing, nonlinear current control, power factor correction, PWM rectifiers.