Mathematical Modelling of Embedded Switched-Inductor Z-Source Inverter for Photovoltaic Energy Conversion

Z-source inverters provide single-stage power conversion for photovoltaic (PV) interface as it does the job of boosting and DC-AC conversion. The topology presented here is derived by fusing the switched-inductor cell (SL) in an embedded switched Z-source inverter which eliminates the problem of inverter leg short circuit (SC). Its output voltage varies over a wide range without any requirement of a time delay in turning on the power switches. This inverter generates high gain factor for the same structural elements in comparison with other topologies and is expected to give continuous input current, and hence, it is more suitable for PV and fuel cell interface. The mathematical model of ESI-ZSI along with PV array is presented in this chapter. The advantageousness of the ESI-ZSI inverter over few basic inverters will be presented by comparing the parameters of the similar existing topologies reported in the literature.