Bidirectional Rapid‐Charging Architecture Using Single‐Ended Zeta (SEZE) Converter With Fuzzy Control for Grid‐Integrated Electric Vehicles

Abstract

This paper addresses a novel single‐ended Zeta (SEZE) converter topology for bidirectional power flow in grids, enabling both vehicle‐to‐grid (V2G) and grid‐to‐vehicle (G2V) operations. The primary challenge tackled is the reduction of total harmonic distortion (THD) and improvement of power quality in grid‐connected charging systems. The SEZE topology distinguishes itself with a modular structure, fewer switching devices, and enhanced energy transfer efficiency, directly addressing conventional limitations related to size, complexity, and harmonic performance. The SEZE framework uses the fuzzy logic controller (FLC) for operating the converter in V2G and G2V modes. During the V2G operation, the FLC controller provides the lowest current THD of 3.51% whereas the PID and PI controllers provide a THD of 4.83% and 10.83%. Moreover, in the G2V mode, the FLC controller provides the lowest current THD of 3.02% whereas the PID and PI controllers provide a THD of 5.02% and 6.64%. From the results, it is identified that the FLC works better than the conventional PID and PI controllers. The proposed converter also shows an efficiency of 97.1% and grid compliance than existing charging architectures. The SEZE converter, with fuzzy control, greatly improves power quality and makes sure that power can be transferred efficiently from V2G and G2V.