Split-Source Nine-Switch Inverter (SSNSI): Analysis and Modulation

Single-stage inverters with boosting capabilities are commonly used in integrating the renewable energy sources with the AC grid/load such as Z-source inverters (ZSI) and split-source inverters (SSI). This paper presents a nine-switch based split-source inverter with two independent three-phase output ports. In the proposed configuration, the input DC voltage is boosted up to the desired voltage level via employing proper modulation scheme, then the boosted voltage is converted to two independent three-phase output voltages, where the voltage magnitude and frequency of each three-phase port can be controlled independently. Detailed illustration of the proposed configuration along with mathematical analysis are presented assuming different modulation schemes, namely, sinusoidal pulse width modulation (SPWM) as well as third harmonic-injection pulse width modulation (THIPWM). Finally, the presented analysis has been verified by the simulation results.