基于AC-Link技术的充电电源具有高效率、高功率密度等优点, 可作为高功率微波系统的初级能源。针对三相AC/AC能量变换的需求, 仿真研究了一种基于AC-Link并联谐振技术的三相AC/AC变换器。给出了并联谐振AC-link三相AC/AC变换器的拓扑结构; 分析了控制原理; 阐述了16模式的具体控制过程和软开关切换的实现方法; 明确了开关切换时间的计算方法; 搭建15 kW仿真平台分析了不同负载要求下的能量变换过程。结果表明:该变换器可以实现固定输出的能量变换, 并且输出电压、频率可调; 输入/输出电流波形均为正弦, 输入功率因数为1; 控制方法正确有效, 实现了软开关切换。

Charging power supply based on AC-link has the advantage of high power density and can be used for primary energy source of high-power microwave (HPM) system. In order to meet the requirement of high power density, a three-phase AC/AC converter based on AC-link parallel resonance is studied. Topological structure and operating principle of the converter is analyzed, the specific working process of 16 modes and the realization of soft-switching are described and the algorithm of switches on time is given. A 15 kW simulation platform is built and energy conversion processes under different loads are analyzed. The result shows that the conversion of voltage and frequency is realized, currents of both sides are sinusoidal, also, unity input power factor and zero voltage switching(ZVS) are realized.