Optimizing EV Charging Power Quality with Enhanced PLL-Driven Active Power Filter

The widespread adoption of electric vehicles (EVs) globally, and their extensive integration into the distribution grid have led to major concerns regarding the quality of power and current in the system. An EV needs a charging station for its battery charging, and the harmonics created are due to the frequent use of power electronics devices. To overcome these harmonics and reduce reactive power, this paper implements a active power filter (APF) using a TPTL- NPC inverter with a dq method-based control strategy. Since APF has a highly sensitive to grid disturbances, raises the possibility of grid instability and power outages. Therefore, an enhanced PLL is used to continually monitoring frequency and phase angles and effectively suppresses dc-offset. Because its improved frequency tracking capabilities and mitigation of dc offset, allow reliable tracking of rapidly changing input frequencies, making it especially useful in dynamic situations. The system description, controller parameters for the APF, and system performance under various conditions are detailed. Simulation results validate the effectiveness of the APF in compensating for reactive power and harmonics, demonstrating its utility in enhanced grid quality.