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Modeling and Control of Quasi Z-Source Inverter for Advanced Power Conditioning Of Renewable Energy Systems

C.Dinakaran, Abhimanyu Bhimarjun Panthee, Prof.K.Eswaramma

Alternate Energy Sources such as Solar, Fuel Cell and Wind have a wide voltage change range due to the nature of sources. Photovoltaic cells voltage varies with temperature and irradiation. The voltage fed Quasi ZSource inverter has been found suitable for photo voltaic (PV) applications mainly because of its single stage buck and boost capability and improved reliability. Fuel cells stack voltage drops greatly with current and this paper details modeling and control issues of Quasi Z-Source used for Distributed Generation (DG) such as photovoltaic (PV) or fuel cell power conditioning. A Robust and reliable grid power interface system for wind turbines using Permanent Magnet Synchronous Generator (PMSG) is proposed in this paper. The dynamic characteristics of the Quasi Z-Source inverter network are first investigated by small signal analysis based on the dynamic model, the stand-alone operation and grid connected operation with closed loop control methods are carried out which are the two necessary operation modes of distributed generation system.