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Voltage Stability Enhancement on 33kv Power Transmission Network in Trans-Amadi Industrial Layout Using Optimized Dynamic Voltage Restorer (DVR)

Adegun, Samuel Kehinde, Roland Uhunmwangho, Chizindu Stanley Esobinenwu

Abstract

This study was conducted to enhance voltage stability within the 33kV Trans-Amadi Industrial Power Transmission Network using an optimized Dynamic Voltage Restorer under a quantitative simulation-based research design. Data required for modelling voltage sags, swells, harmonic distortion, reactive imbalance and feeder-level instability were collected from different technical sources and synthesized in line with the baseline disturbance characteristics of the Trans-Amadi industrial layout, particularly on Feeder RSPUB2 at Bus B_RSPUB2. MATLAB– Simulink modelling, multi-layer surface plots, controller-based simulations and location sensitivity analysis were used to assess the key controllers involving the DVR capacity: injection voltage magnitude, response time under conventional proportional–integral (PI) control, active disturbance rejection control , comparative controller performance involving PI, voltage resistance regulation , fuzzy logic control and installation location effects on spatial voltage regulation. Results indicated that an optimal injection of 0.1115pu produced the most stable voltage-compensation envelope. ADRC-based DVR restored voltage faster (0.065–0.175s) than PI control (≈0.329s), maintaining at least 70% sag-depth reduction during line-to-ground and line-to-line faults in the Trans-Amadi network. DVR capacity significantly affected harmonic mitigation, with VRR and ADRC yielding 1.48% and 1.41% THD reduction, while PI and FLC remained below 0.62%. Overall, VRR achieved the highest sag reduction effectiveness (≈91.77%), and mid-feeder placement near 3.276km minimized imbalance (0.1699pu). whereas ADRC demonstrated the fastest stabilization under fluctuating nonlinear loads. It was concluded that achieving long-term voltage stability in the Trans-Amadi Industrial Layout requires optimized DVR injection parameters, advanced controller intelligence and strategic feeder placement. It was therefore recommended that industrial feeders in Trans-Amadi adopt ADRC- and VRR-enhanced DVR schemes, standardize power-quality (PQ) thresholds, implement continuous monitoring and align DVR sizing with nonlinear load behaviour to strengthen voltage stability and industrial productivity across the 33kV transmission network.

Keywords

Voltage stabilityDynamic Voltage RestorerPower quality33kV transmission networkindustrial power systemsOptimization I.

References

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