Paper Details

Power quality disturbances, particularly voltage sag and swell, can adversely affect sensitive loads, industrial processes and the reliability of modern distribution systems. This study presents a comparative simulation-based assessment of two power-electronic mitigation devices: the Dynamic Voltage Restorer (DVR) and the Distribution Static Synchronous Compensator (D-STATCOM). A three-phase distribution network was developed in MATLAB/Simulink at 415 V and 50 Hz, with the principal disturbance represented as a severe voltage sag of 0.7 p.u. The DVR was modeled as a series-connected voltage-source converter with a 100 V dc link, 1 mH filter inductance and 1 µF filter capacitance, while the D-STATCOM was modeled as a shunt-connected converter using a 200 V dc bus and coupling interface. Performance was evaluated using load-voltage recovery, total harmonic distortion (THD), dynamic response, overshoot and ripple. The results show that the DVR restored the load voltage to 1.00 p.u., corresponding to 100% recovery, while the D-STATCOM restored it to approximately 0.96 p.u. or 96% recovery. THD decreased from 12.5% before compensation to 2.1% with the DVR and 5.8% with the D-STATCOM, representing reductions of 83.2% and 53.6%, respectively. The measured simulation response times were approximately 2 ms for the DVR and 5 ms for the D-STATCOM. The normalized aggregate technical-performance ranking gave the DVR 64.3% and the D-STATCOM 35.7%. An indicative published cost benchmark cited in the thesis gives lower equipment cost for D-STATCOM, making it attractive where reactive-power support and general voltage regulation are more important than precise deep-sag restoration. The study therefore concludes that the DVR is the stronger technical option for sensitive-load voltage restoration, while the D-STATCOM provides a lower-cost alternative for general voltage support.

Anionovo Ugochukwu Edebeani, Okafor Emmanuel Chigbo, Charles Austeen Ibeh, Anazia Emmanuel Aninye, “Comparative Assessment of Dynamic Voltage Restorer and D-STATCOM for Voltage Sag and Swell Mitigation in a Distribution Network”, International Journal of Advance Engineering and Research Development (IJAERD), Vol. 13, Issue 9, pp. 8-13, September 2026, DOI: 10.5281/zenodo.22974793.