Active power filter control using hybrid fuzzy proportional-integral and hysteresis controllers for mitigating the harmonics generated by electric vehicles

In this study, a method is proposed to minimize the harmonics injected by the electric vehicle (EV) chargers at the point of common coupling using a shunt active power filter (APF). The proposed APF utilizes a bidirectional voltage source inverter (VSI). Herein, two different control techniques are implemented to enhance the robustness and effectiveness of the system. First, an effective hysteresis controller is developed to provide the necessary switching pulses for driving the VSI. Then, a hybrid fuzzy proportional-integral (PI) controller is designed to regulate the DC link voltage of the VSI. Furthermore, a positive-sequence synchronous reference frame controller and a low-pass filter are used to estimate and extract the harmonics content injected by the EV chargers at the point of common coupling. Subsequently, various case studies are conducted to evaluate the performance of the proposed harmonics mitigation technique. The simulation results show that the fuzzy PI-based DC link regulation method provides enhanced dynamic control of the DC link capacitor voltage under various operating conditions when compared with those provided by a conventional PI controller. Furthermore, the total harmonic distortion (current) at the source side under various operating conditions can be limited well below the IEEE 5191992 harmonic standard.