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Home / Journals / ENERGY / Online First / doi:10.32604/ee.2025.072982
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Robust Sensor—Less PR Controller Design for 15-PUC Multilevel Inverter Topology with Low Voltage Stress for Renewable Energy Applications

K. Naga Venkata Siva1, Damodhar Reddy2, P. Krishna Murthy3, Kiran Kumar Pulamolu4, M. Dharani5, T. Venkatakrishnamoorthy6,*
1 Department of Electrical & Electronics Engineering, Sasi Institute of Technology & Engineering, Tadepalligudem, 534101, India
2 Department of Electrical & Electronics Engineering, Institute of Aeronautical Engineering, Dundigal, Hyderabad, 500043, India
3 Department of Electronics and Communication Engineering, Chadalawada Ramanamma Engineering College, Renigunta Road, Tirupati, 517506, India
4 Department of Computer Science & Technology, Sasi Institute of Technology & Engineering, Tadepalligudem, 534101, India
5 Department of Electronics and Communication Engineering, Mohan Babu University, Tirupathi, 517102, India
6 Deptartment of Electronics and Communication Engineering, Sasi Institute of Technology & Engineering, Tadepalligudem, 534101, India
* Corresponding Author: T. Venkatakrishnamoorthy. Email: email
(This article belongs to the Special Issue: Advanced Analytics on Energy Systems)

Energy Engineering https://doi.org/10.32604/ee.2025.072982

Received 08 September 2025; Accepted 11 November 2025; Published online 05 December 2025

Abstract

Conventional multilevel inverters often suffer from high harmonic distortion and increased design complexity due to the need for numerous power semiconductor components, particularly at elevated voltage levels. Addressing these shortcomings, this work presents a robust 15-level Packed U Cell (PUC) inverter topology designed for renewable energy and grid-connected applications. The proposed system integrates a sensor less proportional-resonant (PR) controller with an advanced carrier-based pulse width modulation scheme. This approach efficiently balances capacitor voltage, minimizes steady-state error, and strongly suppresses both zero and third-order harmonics resulting in reduced total harmonic distortion and enhanced voltage regulation. Additionally, a novel switching algorithm simplifies the design and implementation, further lowering voltage stress across switches. Extensive simulation results validate the performance under various resistive and resistive-inductive load conditions, demonstrating compliance with IEEE-519 THD standards and robust operation under dynamic changes. The proposed sensorless PR-controlled 15-PUC inverter thus offers a compelling, cost-effective solution for efficient power conversion in next-generation renewable energy systems.

Keywords

PUC packed U cell; MLI multilevel inverter; SLC sensorless controller; PR proportional resonant controller; PD phase disposition; THD total harmonic distortion

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