An Enhanced Single-Phase Step-Up Five-Level Inverter

In this letter, an enhanced step-up five-level inverter is proposed for photovoltaic systems. Compared with conventional five-level inverters, the proposed topology can realize the multilevel inversion with high step-up output voltage, simple structure, and reduced number of power switches. The operating principle of the proposed inverter has been analyzed and the output voltage expression has been derived. In addition, the comparison with existing topologies of single-phase five-level inverters is presented. Finally, experimental results validate the performance of the proposed topology.