Analysis and design of a high-frequency link DC to utility interface using square-wave output resonant inverter

摘要

A line-current-modulated high-frequency (HF) link DC to utility interface power conditioning system using a square-wave output resonant inverter is proposed. The proposed system consists of a square-wave output HF resonant inverter, a rectifier, and a line-connected inverter (LCI). The system is modeled using the constant current model for the HF inverter and the step model for the DC link current. The operating modes, analysis, design, and experiment results are presented. It has been shown that systems operating with less than 5% line current harmonic distortion are realizable when the type II commutation scheme is used for the LCI. A typical application of the system presented is in interfacing photovoltaic arrays to utility lines.