e-Prime: Advances in Electrical Engineering, Electronics and Energy (Jun 2024)
Power factor corrected Y-cell modified boost converter fed battery charger for EV applications
Abstract
This paper presents the power factor corrected Y-Cell Modified Boost (YCMB) converter-fed battery charger for electric vehicle (EV) applications. The proposed YCMB converter-based EV charging system eliminates all the nonlinearities of the conventional AC-DC charging system, therefore, the total harmonic distortion (THD) in current at the source side becomes less than 5 % during both the charging modes throughout the charging operation (from deep discharge to fully charged) of the battery in constant current and constant voltage mode of operations. Therefore, the system is meeting international standards of power quality including IEEE519 and IEC61000-3-2. Whereas, the conventional battery charging systems draw a non-sinusoidal source current of very high THD. The presented scheme has converted a highly nonlinear conventional AC-DC EV charging system into a linear system that suppresses all the harmonic currents and reduces reactive power demanded by the system from the source using YCMB converter topology and effective control technique. It also eliminates the requirement of input LC filter for harmonic reduction at source side current which in turn reduces the size and significantly enhances the system efficiency (up to 95 %). The control section of the presented scheme consists of two major loops. The sliding mode feature in the power factor correction control loop of the system removes all the possibilities of a sudden spike in source current under all dynamic operating conditions thus ensuring the PFC operation at dynamic operating conditions unlike the conventional systems. The simulation model and laboratory prototype of the presented scheme has been developed. The simulated and experimental performance of the system is found to be significantly improved and satisfactory under steady state and various dynamic operating conditions.
