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Volume 1, Issue 6 - May 2026

Performance Assessment and Voltage Improvement of a Radial Distribution Network Using ETAP

Paper ID: CRSIJ26000211

Author(s): Ahmed, E. A, Ibiam Nzeogu Inya, Okomgboeso Chijioke Jude, LAWAL Akeem Olaide

Category: Engineering and Technology

Research Area: Power System Engineering

Pages: 599-609

Published Date: 11-07-2026

Volume/Issue: Volume 1 Issue 6 May-2026

ISSN (Online): 3108-1584

Abstract

This study evaluates the steady-state performance of a 6-bus radial distribution network and examines voltage improvement using ETAP load-flow analysis. A base case without compensation is assessed to quantify voltage deviation, feeder and transformer loading, and active/reactive power losses, key planning indicators in distribution networks where voltage drop accumulates along a single supply path. The system, modelled with a 33 kV source stepped down to an 11 kV feeder supplying downstream aggregated loads, is solved using the Newton–Rap son method for its robustness in nonlinear power-flow equations. Results show severe under-voltage at Bus 5 (58.1 %), high branch currents, and substantial technical losses. To enhance performance, shunt capacitor banks are installed at Buses 5 and 6, ranging from 0.5 to 3.0 Mvar in 0.5 Mvar increments to study sensitivity and practical sizing. Post-compensation, bus voltages are restored near nominal (0.999–1.019 pu), branch currents decrease significantly (e.g., 351.6 A to 262.7 A in a critical section), and losses reduce from 1.393 MW to 0.817 MW (41.35%) and 2.429 Mvar to 1.424 Mvar (41.38%). The results confirm that properly placed and sized shunt capacitors effectively improve voltage regulation, reduce loading stress, and minimize losses in radial distribution feeders.

Keywords

ETAP load-flow analysis, radial distribution network, Shunt capacitor bank, Voltage improvement, Technical losses, Branch currents

Citations

Ahmed, E. A, Ibiam Nzeogu Inya, Okomgboeso Chijioke Jude, LAWAL Akeem Olaide, "Performance Assessment and Voltage Improvement of a Radial Distribution Network Using ETAP", Cosmo Research & Science International Journal, vol. Jul-25, no. 1, pp. 599-609, 2026.

Ahmed, E. A, Ibiam Nzeogu Inya, Okomgboeso Chijioke Jude, LAWAL Akeem Olaide (2026). Performance Assessment and Voltage Improvement of a Radial Distribution Network Using ETAP. Cosmo Research & Science International Journal, Jul-25(1), 599-609.

Ahmed, E. A, Ibiam Nzeogu Inya, Okomgboeso Chijioke Jude, LAWAL Akeem Olaide. "Performance Assessment and Voltage Improvement of a Radial Distribution Network Using ETAP." Cosmo Research & Science International Journal, vol. Jul-25, no. 1, 2026, pp. 599-609.

BibTeX
                @article{CRSIJ26000211,
                  author = {Ahmed, E. A, Ibiam Nzeogu Inya, Okomgboeso Chijioke Jude, LAWAL Akeem Olaide},
                  title = {Performance Assessment and Voltage Improvement of a Radial Distribution Network Using ETAP},
                  journal = {Cosmo Research and Science International Journal},
                  year = {2025},
                  volume = {1},
                  number = {6},
                  pages = {599-609},
                  issn = {3108-1584},
                  url = {https://cosmorsij.com/published/CRSIJ26000211.pdf},
                  abstract = {This study evaluates the steady-state performance of a 6-bus radial distribution network and examines voltage improvement using ETAP load-flow analysis. A base case without compensation is assessed to quantify voltage deviation, feeder and transformer loading, and active/reactive power losses, key planning indicators in distribution networks where voltage drop accumulates along a single supply path. The system, modelled with a 33 kV source stepped down to an 11 kV feeder supplying downstream aggregated loads, is solved using the Newton–Rap son method for its robustness in nonlinear power-flow equations. Results show severe under-voltage at Bus 5 (58.1 %), high branch currents, and substantial technical losses. To enhance performance, shunt capacitor banks are installed at Buses 5 and 6, ranging from 0.5 to 3.0 Mvar in 0.5 Mvar increments to study sensitivity and practical sizing. Post-compensation, bus voltages are restored near nominal (0.999–1.019 pu), branch currents decrease significantly (e.g., 351.6 A to 262.7 A in a critical section), and losses reduce from 1.393 MW to 0.817 MW (41.35%) and 2.429 Mvar to 1.424 Mvar (41.38%). The results confirm that properly placed and sized shunt capacitors effectively improve voltage regulation, reduce loading stress, and minimize losses in radial distribution feeders.},
                  keywords = {ETAP load-flow analysis, radial distribution network, Shunt capacitor bank, Voltage improvement, Technical losses, Branch currents },
                  month = {May}
        }      

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