Design and Impelementation of an Improved Quasi-Z-Source Inverter for PV Power System Application

Document Type : Original Article

Authors

1 Faculty of Engineering, University of Mohaghegh Ardabili.

2 Faculty of Engineering,, University of Mohaghegh Ardabili.

Abstract

With the environmental restrictions created for fossil fuels and the reduction of its resources, nowadays the trend towards renewable energy has increased significantly and is developing. With the advancement of technology and power tools, the potential required for the exploitation of renewable energies such as solar, wind, water and fuel cell energy has improved a lot. With the introduction of power converters, the ground was created for the exploitation of renewable energies, and since impedance source and quasi-impedance source converters were one of the best options for renewable energies, they received special attention. In this research, a new topology is introduced that has a higher boost coefficient, input current stress, capacitor voltage stress and less switch compared to the previously presented topologies. Also, this topology has the ability to operate with different modulation coefficients. The impedance source converter is able to solve some limitations of the usual voltage source and current source inverters and also, has the ability to increase and decrease the voltage. The ability to reduce and increase voltage has made impedance source converters a powerful and practical interfaces for renewable energy use. However, as one of the biggest disadvantages of impedance source inverters despite the input current and low current voltage, we can point out the discontinuity of the input current, the suddenness of the current at the moment of starting, and also the high voltage stress of the capacitors, which causes the selection sensitivity and reduces the lifetime of the components.

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