A Nine-Level Quadratic Boost Common Ground Inverter Topology with Reduced Voltage Stress on Switches

Articles in Press

Document Type : Research Article

Authors

1 Department of Electrical and Electronics Engineering, J.J. College of Engineering and Technology, Tiruchirappalli, India.

2 Department of Electrical and Electronics Engineering, University College of Engineering BIT Campus, Tiruchirappalli, India.

10.24200/sci.2025.66257.9941

Abstract

Transformerless multilevel inverters (TMLIs) are emerging as a highly attractive solution for grid-connected solar photovoltaic (PV) systems. However, in TMLIs, leakage current will flow due to the absence of galvanic isolation between the PV DC side and the grid AC side. This article proposes a nine-level transformerless direct ground connection type inverter employing three switched capacitors (SCs) to generate a multilevel output waveform. This single-stage topology delivers a quadratic boost and a multilevel output suitable for grid connection while maintaining a common ground connection to suppress leakage current. Due to the self-balancing nature of the capacitor voltages, the proposed topology does not require sensor monitoring or dedicated control circuits. The voltage stress on utilised semiconductors and SCs is within the output voltage, which reduces the inverter’s size and cost. In addition, the lower total standing voltage per unit and capacitor voltage diversity factor are also less than those of the other recent topologies. Further, a detailed comparison is needed to show the merits of the proposed inverter over other recent alternatives, including its leakage current removal and boosting factor. Simulations were conducted at an 895 W output power level using the MATLAB/PLECS tools to assess the practical applicability of the proposed inverter. These simulations were further validated through a laboratory experimental setup and presented with the corresponding results.

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Scientia Iranica

Articles in Press, Accepted Manuscript
Available Online from 22 October 2025

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History

  • Receive Date: 03 February 2025
  • Revise Date: 05 August 2025
  • Accept Date: 09 September 2025

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