A High Step-Up 5L-ANPC Inverter Topology

Active neutral-point clamped (ANPC) multilevel inverter topologies are well-suited for a wide range of applications, including (i) reducing the common mode voltage and (ii) suppressing the leakage current in transformerless PV applications. In addition, its structure is simple, and its dynamic performance is suitable for various power factor operating conditions. However, the output voltage of conventional ANPC-type topologies is half the input voltage, necessitating a front-end dc-dc boost converter with a high voltage gain to increase the output voltage. This article proposes a single-stage ANPC type five-level inverter topology with an integrated low-voltage stress front-end dc-dc boost converter. This makes them suitable for applications with a wide range of input voltage. The various modes of operation and the DC and AC design analysis for the proposed inverter are discussed. The proposed topology requires fewer components than the conventional and SC-based ANPC topologies. A detailed comparison demonstrates that the proposed topology is superior to the recent single-stage ANPC topologies. The proposed inverter's operating principle, modulation scheme, and efficiency are discussed. Finally, the potential of the proposed topology is validated using the prototype setup for 400W to confirm the feasibility of this research.