《《Z - Source Inverter for Residential Photovoltaic Systems》.pdfVIP

1776 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 21, NO. 6, NOVEMBER 2006 Z-Source Inverter for Residential Photovoltaic Systems Yi Huang, Miaosen Shen, Student Member, IEEE, Fang Z. Peng, Fellow, IEEE, and Jin Wang, Member, IEEE Abstract— This paper proposes a -source inverter system for a split-phase grid-connected photovoltaic system. The operation principle, control method, and characteristics of the system are presented. A comparison between the new and traditional system configurations is performed. Simulation and experimental results are also shown to verify the proposed circuit and analysis. Index Terms—Photovoltaic (PV), power conditioning, MPPT, -source inverter. I. INTRODUCTION T IS believed that the distributed generation market will be Ibetween US $10 and 30 billion by the year 2010. Due to environmental concerns, more effort is now being put into clean distributed power like geothermal, wind power, fuel cells, and photovoltaic (PV) that directly uses the energy from the sun to generate electricity. The worldwide grid-connected PV system grows at a rate of 25% every year. As the energy from the sun is free, the major cost of pho- Fig. 1. Traditional PV systems: (a) dc–ac with stepup transformer and (b) dc–ac tovoltaic generation is the installation cost, which is mainly with dc–dc boost. composed of the costs of solar modules and the interface con- verter system, also called the power conditioning system (PCS). requirements: With the development of solar cell technology, the price of solar 1) to convert the dc voltage into ac voltage; modules has dropped dramatically. A recent worldwide survey 2) to boost the voltage, if the PV array vo