Abstract：Phase synchronization is essential for maintaining stable power flow in bidirectional inductive power transfer (BIPT) systems. Some traditional phase synchronization methods utilize additional hardware, such as auxiliary coils or high-speed and high-precision detection and conditioning circuits, to obtain phase information on the primary side. However, the complexity and cost of the system may be increased. Other methods without additional hardware realize phase synchronization by the perturbation and observation algorithm. However, the control degrees of freedom cannot be fully exploited. This paper proposes a phase synchronization method based on power-synchronization control. The proposed method fully utilizes the intrinsic power-angle characteristic of the system, which does not require additional hardware and can fully use the control degrees of freedom. Power regulation and phase synchronization can be simultaneously achieved. Firstly, the steady-state power-angle characteristic of the dual-side LCC compensated BIPT system was derived. The power magnitude and direction of the system correlate with the angle δ, which represents the relative phase angle between the primary and secondary excitation voltage. Secondly, the working principles of the high-resolution variable frequency modulation of the BIPT system, which is the modulation basis of the proposed phase synchronization method, were analyzed. Thirdly, the control block diagram of the proposed phase synchronization method was established. Phase synchronization was achieved simultaneously through feedback control of the system power measured on the secondary DC side. The small signal model of the control loop was obtained. A design method for the loop controller was provided. Finally, the efficiency optimization control method was given, and the comprehensive control block diagram was presented. Simulation results show that the simulation sweep data fit well with the theoretical small signal model of the control loop. Experiment results show that the proposed phase synchronization method can stabilize power transfer and regulate the dual-side LCC-compensated BIPT system. In transient response, the system switches the power flow direction naturally and smoothly. In steady-state, the system balances the loss of the AC link and the switching loss of the power switches. Zero voltage switching (ZVS) of all power switches is realized with a low reactive loss of the AC link, achieving high operating efficiency under wide load range operating conditions. The following conclusions can be drawn. (1) The proposed phase synchronization method utilizes the intrinsic power-angle characteristic of the system. Power regulation and phase synchronization are simultaneously achieved, and the control degrees of freedom can be fully exploited. (2) The proposed method does not require additional hardware, such as auxiliary coils or high-speed and high-precision detection and conditioning circuits, which can reduce the complexity and cost of the system and is easy to implement.
甘霖, 陈昌松, 贾舒然, 李夏岩, 崔博文. 基于功率同步控制的双向感应式电能传统相位同步方法[J]. 电工技术学报, 2025, 40(24): 7906-7917.
Gan Lin, Chen Changsong, Jia Shuran, Li Xiayan, Cui Bowen. A Phase Synchronization Method Based on Power-Synchronization Control for Bidirectional Inductive Power Transfer Systems. Transactions of China Electrotechnical Society, 2025, 40(24): 7906-7917.
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