Work

A quadruple-boost nine-level common-ground inverter with reduced voltage stress for grid-connected PV systems

Year: 2025

Type: article

Abstract: • It is a new nine-level switched-capacitor transformerless inverter topology featuring a common-ground configuration for photovoltaic (PV) and grid-connected applications. • The proposed inverter reaches quadruple voltage boost using a single DC source and employs twelve power switches, three self-balancing capacitors, and a single diode. • Elimination of Leakage current. • Balanced capacitor voltages without external sensors or controllers. • A key feature is the reduction of switch voltage stress, with the maximum blocking voltage limited to the output voltage, unlike many recent topologies that require switches rated for 1.5 to 2 times the output voltage. This paper presents a new nine-level switched-capacitor transformerless inverter topology featuring a common-ground configuration for photovoltaic (PV) and grid-connected applications. The proposed inverter achieves a quadruple voltage boost using a single DC source and employs twelve power switches, three self-balancing capacitors, and a single diode. The common-ground structure effectively eliminates leakage current by stabilising the common-mode voltage and ensuring enhanced safety. The design avoids the need for H-bridge or polarity reversal circuits, while maintaining balanced capacitor voltages without external sensors or controllers. A key feature is the reduction of switch voltage stress, with the maximum blocking voltage limited to the output voltage, unlike many recent topologies that require switches rated for 1.5 to 2 times the output voltage. Detailed operational analysis, component selection, and loss analysis have been presented. The topology’s performance is validated through MATLAB/Simulink and PLECS simulations, along with experimental testing on a 1.3 kW laboratory prototype. To highlight the merits of the proposed topology, a comprehensive comparison with the recent nine-level quadruple-boost inverter topologies is presented.

Source: Results in Engineering

DOI: 10.1016/j.rineng.2025.107883

Authors: Rattan Kumar Venkatesan, Chitra Lakshmikanthan

Institution: Vinayaka Missions University

Language: English

Topic: Multilevel Inverters and Converters

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Affordable and clean energy, Industry, innovation and infrastructure

Open Access status: gold

Estimated APC paid: $1,940