A New Type of PWM Rectifier with Function of Harmonic Suppression and Reactive Power Compensation

Aiming at solving the problem of harmonic suppression and reactive power compensation, the traditional method is to use reactive power compensation and active power filter. This paper has promoted a new type of Pulse Width Modulation (PWM) rectifier that has the function of harmonic suppression and reactive power compensation which also describes the control method in detail. The paper attempts to bring up instantaneous reactive power ip-iq theory and reactive detection algorithm on the basis of the PWM rectifier. At the same time, it proposes voltage-current dual closed-loop control system using fuzzy PI hybrid control to regulate the DC bus voltage. Thus, not only does the PWM rectifier have the function of rectifying effect, but also achieve the harmonic suppression and reactive power compensation in the power grid. At last analyze the energy flow process and uses the PSIM software simulation to verify functional effects. The simulation results show that PWM rectifier improves the output current waveform and doesn't need additional compensation device.