Meysam Salehi - Faculty of Electrical and Computer Engineering University of Urmia, Urmia, Iran
Behrooz Toosi
Mohammad Farhadi kangarlu
Masuod Aliloo

In this paper, an improved power conversion structure for integrating photovoltaic systems into the power grid is presented. In order to obtain a galvanic insulation between the grid and the PV panel, many PV systems use a power transformer, avoiding that a leakage current may flow through the capacitance between PV panel and ground. Some systems use a transformer embedded in a high-freq ency DC/DC converter. This structure is based on a multilevel inverter and on an isolated DC-DC converter. The structural design of this power converter allows a nine-level shaped output voltage wave at the output of the multilevel inverter. To control the proposed structure, model predictive control(MPC) technique is used. PSCAD/EMTDC software is used for simulation of the converter

Photovoltaic power conversion, isolated DC-DC converter, grid connection, multilevel inverter, model predictive control (MPC)