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