Modeling, Design, Control, and Implementation of a Modified Z-Source Integrated PV/Grid/EV DC Charger/Inverter

Solar energy has been the most popular source of renewable energy for residential and semicommercial applications. Fluctuations of solar energy harvested due to atmospheric conditions can be mitigated through energy storage systems (ESS). Solar energy can also be used to charge electric vehicle batteries to reduce the dependence on the grid. One of the requirements for a converter for such applications is to have a reduced number of conversion stages and provide isolation. The Z-source inverter (ZSI) topology is able to removemultiple stages and achieve voltage boost and dc-ac power conversion in a single stage. The use of passive components also presents an opportunity to integrate ESS into them. This paper presents modeling, design, and operation of a modified ZSI integrated with a split primary isolated battery charger for dc charging of electric vehicle batteries. Simulation and experimental results have been presented for the proof of concept of the operation of the proposed converter.