一种高效DC-AC功率转换系统设计与仿真

Design and simulation of an efficient DC-AC power conversion system

为了减少DC-AC转换系统中转化器和逆变器开关损耗,设计了一种高效的、由双端降压转换器以及H桥逆变器组成的DC-AC功率转换系统.分别设计了降压转换器控制器以及逆变器控制器来控制双端降压转换器和H桥逆变器,通过双向降压转换器产生逆变器的混合输入电压,并在H桥逆变器添加简单的LC滤波电路,使得逆变器输出电压谐波失真被限制在0.2%以内,满足IEEE 519标准.结果表明,所提出的两级PEI的总开关损耗不足一级PEI的一半.此外,在负载阻抗和输出功率发生变化的情况下,也可以保证稳定的电压与电流控制性能.

In order to reduce the switching loss of converter and inverter in the DC-AC conversion system,an efficient DC-AC power conversion system consisting of a bidirectional Buck converter and an H-bridge inverter was designed. The Buck converter controller and inverter controller were respectively designed to control the bidirectional Buck converter and H-bridge inverter. The mixed input voltage of inverter was generated with the bidirectional Buck converter,and a simple LC filtering circuit was added to the H-bridge inverter to make the output voltage harmonic distortion of inverter be limited to 0. 2% and meet the IEEE519 standard. The results showthat the total switching loss of proposed two-stage PEI is less than half of that of one-stage PEI. In addition,under the condition that the load impedance and output power change,a stable voltage and current control performance can be guaranteed.