为提高电源在电网非理想输入情况下工作的适应性，采用解耦双同步坐标系下的三相锁相环，能够获取电网电压的相位与频率信息，并通过FIR滤波环节提取输入线电压的基波幅值，及时准确地为电源提供控制参数。建立了Matlab/Simulink仿真模型，在三相输入不平衡、频率变化、电压畸变等情况下进行仿真，并基于DSP2812芯片编写了控制程序进行测试。仿真与实验结果表明：在各种电网输入情况下，该方法都能够准确提取输入线电压的幅度、相位以及频率信息，为电源的良好运行提供保障。

Charging power based on HF AC-Link technology can be used as a primary power source for high-power microwave systems. In order to improve the adaptability of the power supply in the power grid with non-ideal input, this paper adopts the three-phase phase-locked loop in the decoupled double synchronous coordinate system to obtain the phase and frequency information of the positive sequence voltage. To extract the input line voltage amplitude of the fundamental wave, this paper uses the FIR filter to provide timely and accurate control parameters for the power supply. The model was established by Matlab/Simulink software, and the simulation was carried out under the condition of three-phase input imbalance, frequency change and voltage distortion. Lastly, a control program was written and tested based on DSP2812. The simulation and experimental results show that the method can accurately extract the amplitude, phase and frequency information of the input line voltage in all kinds of grid input, and provide a guarantee for good operation of the power supply.