New Hybrid Structure Based on Extended Boost Quasi Z-Source and parallel Inverters for Photovoltaic System Applications

Nowadays, with the increasing penetration of renewable energy sources such as wind, solar and tidal power, into modern power systems, power electronic converters are commonly employed as the interface to the utility grid. Due to the availability of high current power electronic devices, it is inevitable to use several inverters in parallel for high-power and/or low-cost applications. So, inverters should be connected in parallel to provide system redundancy and high reliability, which are important for critical customers. This paper presents a new hybrid structure based on extended-boost quasi Z-source converters and parallel inverters to increase the output voltage in a wide range, usable in photovoltaic (PV) systems. Additionally, the proposed inverter has all the advantages of parallel power converters. Due to this view, it could also be possible to break high current loads into branches (current sharing). The proposed topology and its performances are validated using simulation results which are obtained in Matlab/Simulink

Keywords:

Voltage gain , Parallel operation , Z-source inverter (ZSI) , Extended boost quasi Z-source inverter (EBQZSI) , Modulation index