Development of an Efficient Nine-Level Inverter with Reduced Switches for Solar PV Systems
摘要
This work presents a nine-level converter using a single solar PV source and a simplified switch arrangement. A boost converter is used to charge a battery with sliding mode controller-based maximum power point tracking and a single DC source produced from solar PV. A DC source derived from the battery is implemented using a partial resonant inverter wherein its AC link has a transformer replacing the standard parallel inductor typically used with partial resonant inverters. The AC link transformer for the partial resonant inverter has four similar secondary windings. High-frequency AC coming from these windings is rectified and filtered before being connected to the nine-level inverter. The output AC voltage is further regulated using another sliding mode controller. This work demonstrates the advantages of developing sliding mode control approaches for maximum power point tracking and output voltage regulation, and the benefits of applying the partial resonant inverter to split a single DC source into four mutually electrically isolated voltage sources. The proposed ideas were simulated using the SIMULINK tool.