Izvorni znanstveni članak
https://doi.org/10.32985/ijeces.17.7.1
A Novel Approach to SVC Control under Unbalanced Conditions for Voltage Stability and Harmonic Minimization
Abraham Lomi
; Institut Teknologi Nasional Malang Department of Electrical Engineering Jl. Raya Karanglo Km. 2, Malang, INDONESIA
*
Widodo Pudji Muljanto
; Institut Teknologi Nasional Malang Department of Electrical Engineering Jl. Raya Karanglo Km. 2, Malang, INDONESIA
Michael Ardita
; Institut Teknologi Nasional Malang Department of Electrical Engineering Jl. Raya Karanglo Km. 2, Malang, INDONESIA
Rifqi Fajryansyah
; Institut Teknologi Nasional Malang Department of Electrical Engineering Jl. Raya Karanglo Km. 2, Malang, INDONESIA
* Dopisni autor.
Sažetak
Voltage instability and harmonic amplification under phase-unbalanced loading remain persistent operational issues in medium-voltage distribution networks, particularly in systems with high penetration of nonlinear loads. This study develops a phase- wise control strategy for an asymmetrically operated Static VAR Compensator (SVC), allowing independent reactive power regulation in each phase through a delta-connected thyristor-controlled reactor configuration. Unlike conventional balanced SVC operation, the proposed controller adjusts firing angles individually to compensate unequal reactive demand and suppress phase-dependent harmonic injection. The control algorithm is validated using detailed time-domain simulations on a 66 kV distribution feeder supplying combined nonlinear and unbalanced loads. System performance is quantified using established power quality indices, including Telephone Interference Factor (TIF), Total Harmonic Current Factor (IT), and Distortion Factor (D). Under dynamic loading conditions with imposed phase imbalance, the proposed method maintains the PCC voltage within acceptable steady-state deviation limits while reducing harmonic propagation. Simulation results indicate measurable improvement in harmonic-related indices compared with symmetrical SVC control. The TIF value decreases significantly, reflecting reduced interference potential. The cumulative harmonic impact, represented by IT, is lowered due to phase-selective compensation. In addition, the distortion factor D shows consistent reduction, confirming improved fundamental current waveform integrity. These findings demonstrate that phase-specific reactive compensation enhances both voltage stability margin and harmonic performance, offering a practical control enhancement for distribution systems experiencing asymmetrical and nonlinear load growth.
Ključne riječi
voltage stability; harmonic distortion; static Var compensator; unbalanced load; power quality indices;
Hrčak ID:
348735
URI
Datum izdavanja:
1.7.2026.
Posjeta: 0 *