COMPREHENSIVE POWER QUALITY ASSESSMENT IN RADIAL DISTRIBUTION SYSTEMS: A HARMONIC-AWARE NCPI COLLAPSE PREDICTION INDEX-BASED HARMONIC IMPACT ANALYSIS

Sofyan Sofyan; Andarini Asri; Alamsyah Achmad

doi:10.31963/elekterika.v22i2.5540

Authors

Sofyan Sofyan Politeknik Negeri Ujung Pandang (PNUP) https://orcid.org/0000-0001-9076-7229
Andarini Asri Politeknik Negeri Ujung Pandang (PNUP)
Alamsyah Achmad Politeknik Negeri Ujung Pandang (PNUP)

DOI:

https://doi.org/10.31963/elekterika.v22i2.5540

Keywords:

Power quality, Novel Collapse Prediction Index (NCPI), Harmonic distortion, Voltage stability, Radial distribution system, IEEE 33-bus test system, Collapse prediction.

Abstract

The proliferation of non-linear loads in modern distribution systems has necessitated a comprehensive understanding of harmonic distortion effects on system stability and collapse prediction metrics. This study presents a novel analytical framework employing the Novel Collapse Prediction Index (NCPI) to quantify harmonic impacts on voltage stability in radial distribution networks. Utilizing the IEEE 33-bus test system as a benchmark, we developed an integrated methodology that incorporates Total Harmonic Distortion in voltage (THDv) and current (THDi) into the classical NCPI formulation. The proposed approach extends the conventional collapse prediction analysis by introducing harmonic correction factors that explicitly account for voltage and current distortions in stability assessment. Our analysis reveals that harmonic distortion can increase NCPI values by 0.5-1.8%, indicating reduced stability margins, with more pronounced effects in heavily loaded branches distant from the source. The study establishes critical thresholds for harmonic-induced stability degradation, providing quantitative evidence that THDi > 15% and THDv > 3% significantly compromise voltage stability margins. Through comprehensive correlation analysis, we demonstrate strong interdependencies between harmonic content, voltage regulation, and collapse prediction indices, with harmonic distortion contributing to measurable reduction in system stability margins. The findings offer practical insights for power system engineers and regulators, facilitating evidence-based decision-making for harmonic mitigation strategies focused on preserving voltage stability in contemporary distribution networks.

Author Biography

Sofyan Sofyan, Politeknik Negeri Ujung Pandang (PNUP)

Sofyan Sofyan completed his S.T. and M.T. degrees in 2002 and 2010, respectively, from the Dept. of Electrical Engineering at UNHAS, Indonesia. Currently, he is pursuing a doctoral program in the Dept. of Electrical Engineering at UTM, Malaysia. Additionally, Sofyan serves as a lecturer in the Dept. of Electrical Engineering at the Polytechnic State of Ujung Pandang (PNUP), Indonesia. His research focuses on the operation and optimization of power systems, energy demand in smart grid systems, and technology related to renewable energy. Sofyan Sofyan menyelesaikan gelar S.T. dan M.T. masing-masing pada tahun 2002 dan 2010 dari Jurusan Teknik Elektro di UNHAS, Indonesia. Saat ini, ia sedang menempuh program doktoral di Jurusan Teknik Elektro di UTM, Malaysia. Selain itu, Sofyan menjabat sebagai dosen di Jurusan Teknik Elektro di Politeknik Negeri Ujung Pandang (PNUP), Indonesia. Penelitiannya berfokus pada pengoperasian dan optimalisasi sistem tenaga listrik, permintaan energi dalam sistem jaringan pintar, dan teknologi yang terkait dengan energi terbarukan.

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