关键词: 无线电能传输, 电励磁同步电机, 励磁电流估算, 变直流母线电压控制, 卡尔曼滤波

Abstract: Magnetic-coupled wireless excitation ( MCWE) , one of the research hotspots of the alternative brushless solutions of the electrically excited synchronous motor ( EESM) , contains the transmitting device in the primary side and the receiving device in the secondary side that fixed on the rotor. To enable secondary-side communication-free operation and reduce rotor weight, this study introduces a variable DC bus voltage primary-side control strategy in the wireless excitation system of EESM. Initially addressing the impact of inverter-induced high-order harmonic voltages on primary compensating inductor currents and consequent excitation current estimation errors, a Kalman filter approach was employed to suppress these harmonics, enhancing excitation current estimation accuracy. Subsequently, magnetic coupling wireless excitation motor excitation current estimates are derived from filtered primary compensating inductor and transmitter coil currents. The primary-side DC-DC converter ' s bus voltage was then modulated based on this excitation current model, facilitating secondary-side excitation current control without communication. Simulation validates the method ' s efficacy in improving excitation current estimation and control precision amid excitation winding impedance variations and sudden excitation current shifts.

Key words: wireless power transmission, electrcally excited synchronous motor ( EESM ), excitation current estimation, variable DC bus voltage control, Kalman filtering