Single-phase Resonant DC Link Inverter with integrated isolation for PV generators

A single-phase resonant DC link inverter for PV domestic applications is proposed in this paper. High efficiency is obtained thanks to a single-stage configuration and a resonant dc link structure providing low switching power losses, while a high frequency transformer integrated into the resonant dc link provides a full exploitation of the input dc voltage as well as some key characteristics of two-stage inverter configurations, such as input voltage boosting, input-output isolation and elimination of leakage current. The high switching frequency made possible by soft switching finally leads to smaller and more efficient output filters. Simulations performed on a 6kW PV plant demonstrated the consistence of the proposed system.