Developed Quasi Z-Source Inverter for Electric Vehicle Applications with Desired Boost Factor and Low Inductor Current

With the growing adoption of electric vehicles (EVs) and the advantages offered by Z-source converters in EV drive systems and charging infrastructure, there is an increasing demand for novel quasi-Z-source inverters. In this paper, a newly developed quasi-Z-source inverter (DQZI) based on a new hybrid basic unit is proposed. This hybrid unit consists of one diode cell and one capacitor cell. The main advantages of the proposed inverter are its high boost factor value, the capability of developing the structure, its continuous input current, low inductors current values, and low inverter input current by extending the structure. These are most important for EV applications, as they lead to increased efficiency, decreased THD, and high-power quality. Therefore, firstly, two-cell DQZSI is completely analyzed, and the equations of the diode's voltage stress, capacitor voltage stress, inductors current, DC link current, diodes current, and boost factor are obtained. Then, three-cell DQZSI and n-cell DQZSI are analyzed, and their related equations are also obtained. Following this, the proposed DQZSI is compared with the conventional ZSI and several ZSIs. Finally, the accurate performance of the proposed inverter is analyzed and reconfirmed by using the experimental results on the two-cell DQZSI in the laboratory prototype.