Reduced switch single source multilevel inverter topology for renewable photovoltaic system applications

S. Meenakshi Sundaravel; Manikandan Bairavan Veerayan

Reduced switch single source multilevel inverter topology for renewable photovoltaic system applications

S. Meenakshi Sundaravel

Manikandan Bairavan Veerayan

Vol. 25, No. 3, pp. 440-457, Mar. 2025

10.1007/s43236-024-00910-5

PV system

Reduced switch MLI

SEPIC integrated Luo converter

Flyback converter

RBFNN MPPT

Abstract

An innovative switched capacitor (SC) based reduced switch multi-level inverter (MLI) design approach that satisfies the requirements of modern energy systems is introduced in this work. The proposed MLI enhances efficiency in photovoltaic (PV) systems by utilizing fewer power switches, improving the power conversion and reducing costs. The design is scalable and adaptable for various PV applications due to its simplified architecture. It incorporates a single-ended primary inductor converter (SEPIC) integrated with a Luo converter, significantly boosting the voltage level of the system and enabling broader adoption of grid-tied PV systems. The SEPIC integrated Luo converter achieves a voltage gain of 12 and an efficiency of 96.5%, which optimizes the power extraction from PV panels through a radial basis function neural network (RBFNN) maximum power point tracking (MPPT) controller. The output of the converter is connected to a Flyback converter at the input of the MLI, further stabilizing the voltage. To achieve grid voltage synchronization, the MLI switches are controlled using a proportional-integral (PI) controller. The overall gain of the MLI system is 4, leading to enhanced output levels. The proposed approach is validated through MATLAB simulations and a lab-scaled prototype implementation, confirming an MLI efficiency of 97.5% and a total system efficiency that meets the stringent demands of modern energy applications. The proposed approach enhances the efficiency and performance of PV systems, which contribute to more reliable and cost-effective integration of PV systems into the grid and promotes the broader adoption and scalability of renewable energy technologies.

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Cite this article

[IEEE Style]

S. M. Sundaravel and M. B. Veerayan, "Reduced switch single source multilevel inverter topology for renewable photovoltaic system applications," Journal of Power Electronics, vol. 25, no. 3, pp. 440-457, 2025. DOI: 10.1007/s43236-024-00910-5.

[ACM Style]

S. Meenakshi Sundaravel and Manikandan Bairavan Veerayan. 2025. Reduced switch single source multilevel inverter topology for renewable photovoltaic system applications. Journal of Power Electronics, 25, 3, (2025), 440-457. DOI: 10.1007/s43236-024-00910-5.