IMPEDANCE SOURCE INVERTER TOPOLOGIES FOR PHOTOVOLTAIC APPLICATIONS – A REVIEW

The impedance source inverters can step up the voltage and hence, they are greatly preferred for photovoltaic applications. There are many impedance and quasi impedance network topologies available. The key factor in selection of topology is the amount of voltage gain obtained along with the reduced number components. This paper compares some of the impedance and quasi - impedance source inverter (qZSI) topologies for photovoltaic applications namely, switched coupled inductor qZSI, switched ZSI, enhanced-boost quasi ZSI with continuous and discontinuous source current topologies, enhanced -boost active qZSI, switched-boost ZSI and high gain switched boost inverter. The parameters taken for comparison are voltage gain, boost factor, voltage, and current stresses on the components etc. Based on the comparison, the high gain switched boost ZSI is found to have high voltage gain along with reduced voltage and current stress. The review will be useful for researchers working in impedance source inverter network.