Design and analysis of an LCL circuit‐based three‐phase grid‐connected inverter

Abstract

Owing to the inherent characteristics of grid‐side inverters, a minimum dc‐side voltage limit usually exists in grid‐connected inverters. To solve this problem, this study proposes a convenient method of designing a novel LCL circuit for a grid‐connected inverter, based on an LCL filter. The primary goal is to reduce the minimum dc‐side voltage limit, while maintaining a considerably low harmonic content in the grid‐side current. The design example of a photovoltaic grid‐connected system demonstrates the convenience of the novel LCL circuit design, and the validity and effectiveness of the novel LCL circuit are verified by simulation and experiments.