Three-phase PFC control strategy based on fractional-order PID controller

With the development of power electronics, more and more power electronic devices are being put into use in the power grid, causing serious harmonic current pollution to the power grid. Active power factor correction (APFC) technology is an important technology for solving harmonic current pollution and has been widely studied and developed. Three-phase PFC based on PWM technology can eliminate harmonic pollution on the grid side and improve power factor and work efficiency. Traditional three-phase PFC generally adopts double PI control strategy of voltage outer loop and current inner loop. However, this traditional control strategy has been unable to adapt to the increasingly complex grid situation. This paper proposes a control strategy that adopts PI controller for voltage outer loop and fractional-order PID controller for current inner loop. And through the Simulink simulation experiment, the result proves that the improved three-phase PFC control strategy presented in this paper has a more stable output voltage and less ripple compared with the traditional dual PI control strategy.