Simulation of Micro Inverter with High Efficiency High Step Up Dc-Dc Converter

Abstract: An alternative solution in PV generation systems is the grid connected AC module. PV panel and micro inverter connected to the grid forms this combination. The power processing interface between the PV source and the electrical grid is high step-up converter and DC-AC inverter. The energy injected to the grid depends on the efficient conversion of high step-up converter and efficient inversion by the DC-AC inverter. The proposed configuration boosts the low array voltage by tracking maximum power from the PV array and converts the high DC power to high quality AC, feeding it to the grid. In this paper a ZETA converter with coupled inductor is used to efficiently recycle the leakage inductor energy. Further the overall safety to the system is enhanced since the PV array appears as an floating source. A discussion about the operating principle, steady state analysis, stress on active components of converter are done in this paper. All the simulation results are presented that verify the maximum PV energy is injected into the grid.

Keywords: Micro inverter, coupled-inductor, ZETA converter, High Efficiency.