Efficient Bidirectional Wireless Power Transfer System Control Using Dual Phase Shift PWM Technique for Electric Vehicle Applications

Abstract

The emerging bidirectional wireless power transfer (BWPT) technology provides improved flexibility without requiring human intervention by facilitating smooth Grid to Vehicle (G2V) and Vehicle to Grid (V2G) operations. Nevertheless, BWPT systems have issues with power factor management, efficiency, and power transfer rate. In order to address these issues, sophisticated control systems are essential. While unidirectional Wireless Power Transfer (WPT) are adequately managed by conventional control techniques and power factor corrector (PFC) approaches, whereas bidirectional systems require dual-side control of power converters in order to efficiently handle G2V and V2G operations. Furthermore, the existing literature predominantly focuses on power factor improvement for unidirectional WPT systems. This paper presents a dual-phase shift Pulse Width Modulation (PWM) technique for an improved PFC control for BWPT. A thorough analysis of the suggested approach is conducted, looking into power factor, bifurcation, total harmonic distortion (THD), and power losses. Experimentation and verification together with simulation studies at an operating frequency of 85 kHz and a power rating of 3.7 kW demonstrate the effectiveness of the system. Dual-phase shift control yields 94.4% power transfer efficiencies in simulations and 90.1% in experimental results in both power transfer directions.

Keywords

• Bidirectional charging
• electric vehicle
• wireless power transfer
• vehicle to grid
• coil structure
• bidirectional DC/DC converters