Enhancement of Power Quality in Photovoltaic Systems for Weak Grid Connections

Pankaj Kumar Sharma, Pushpendra Singh (), Sharat Chandra Choube and Lakhan Singh Titare
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Pankaj Kumar Sharma: Department of Electrical & Electronics Engineering, UIT-RGPV, Bhopal 462036, MP, India
Pushpendra Singh: Department of Electrical Engineering, Rajkiya Engineering College Banda, AKTU Lucknow, Lucknow 210201, UP, India
Sharat Chandra Choube: Department of Electrical & Electronics Engineering, UIT-RGPV, Bhopal 462036, MP, India
Lakhan Singh Titare: Department of Electrical Engineering, Government Engineering College, Ujjain 456010, MP, India

Energies, 2025, vol. 18, issue 15, 1-22

Abstract: This paper proposes a novel control strategy for a dual-stage grid-connected solar photovoltaic (PV) system designed to ensure reliable and efficient operation under unstable grid conditions. The strategy incorporates a Phase-Locked Loop (PLL)-based positive sequence estimator for accurate detection of grid voltage disturbances, including sags, swells, and fluctuations in solar irradiance. A dynamic DC-link voltage regulation mechanism is employed to minimize converter power losses and enhance the performance of the Voltage Source Converter (VSC) under weak grid scenarios. The control scheme maintains continuous maximum power point tracking (MPPT) and unity power factor (UPF) operation, thereby improving overall grid power quality. The proposed method is validated through comprehensive simulations and real-time hardware implementation using the OPAL-RT OP4510 platform. The results demonstrate compliance with IEEE Standard 519, confirming the effectiveness and robustness of the proposed strategy.

Keywords: PLL-based positive sequence estimator; power quality; VSC; MPPT; solar PV array; switching losses; PSCs (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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