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

A single phase resonant DC link inverter is proposed in this paper for the connection of domestic Photo-Voltaic or solid state Thermo-Electric generators to the AC grid. High efficiency is obtained thanks to a single-stage configuration and a resonant dc link structure providing low switching power losses, furthermore, a high frequency transformer integrated into the resonant dc link leads to a full exploitation of the input dc voltage and to the achievement of some typical features of two-stage inverters, such as voltage step-up, isolation, and very low leakage current. The high switching frequency made possible by soft switching finally leads to smaller and more efficient output filters. The consistence of the proposed configuration is assessed through the simulation of a 6kW PV plant.