Input Reactive Power Control of Bidirectional WPT to Improve System Efficiency

In a bidirectional wireless power transfer (BWPT) system, misalignment significantly impacts system performance. As the misalignment changes, the power delivered to the load and efficiency reduces for constant input power. Hence, this paper proposes an input reactive power control-based dual phase-shift control (DPS) technique to maintain the output power transfer and improve efficiency. This method controls the receiver side converter (RSC) to maintain the output power by controlling the phase-shift angle (ß). Further, the system efficiency is enhanced by maintaining the system at its optimal operating point by achieving zero power factor angle (ZPA). The ZPA condition is achieved by controlling the transmitter side converter (TSC) phase shift angle (α) to make the input reactive power ($Q_{in}$) equal to zero. The proposed control technique is implemented on a 1 kW series-series (S-S) compensated BWPT laboratory prototype. The simulated and experimental results are provided for different lateral misalignment and loading conditions.