1 kVA高性能单相中频逆变电源的研制

Research on 1 kVA High-performance Single-phase Middlefrequency Inverter

针对低压直流输入/中频400 Hz/115 V交流输出的高功率密度航空变流器的应用需求,提出了两级电路拓扑结构,其前级采用并-串型移相全桥结构实现隔离和升压的功能,后级采用全桥电路实现逆变功能。同时,为减小单相逆变器直流侧的二次纹波电流对前级的影响,前级单模块采用加入陷波器的负载电流前馈控制策略。为了进一步提高前级并-串型DC-DC变换器的动态性能,还提出了一种主从控制的均压控制策略;为了提高后级逆变电路的动态性能和负载调整率,提出一种改进的前馈控制策略。仿真和实验均验证了上述两级结构逆变电源控制策略的可行性。

A two-stage circuit topology was proposed in this paper to meet the application demands for a high power density converter used in the field of aerospace,which was with low voltage DC input,middle-frequency of 400 Hz,and 115 V AC output.The pre-stage adopted an input parallel and output series(IPOS)phase shifted full-bridge str-ucture to realize isolation and voltage boost,while the post-stage selected the full-bridge circuit to realize the inverter function.Meanwhile,to suppress the effect on the pre-stage due to the secondary ripple current on the DC side of the single-phase inverter,the pre-stage module adopted a load current feedforward control strategy with wave trap;to further improve the dynamic response of the pre-stage IPOS DC-DC converter,a voltage balancing control strategy under master-slave control was also proposed.Moreover,an improved feedforward control strategy was proposed to improve the dynamic performance and load regulation rate of the post-stage inverter circuit.Finally,the validity of the two-stage inverter control strategy was verified by simulation and experimental results.