| PhD Seminar

Name of the Speaker: Ms. Nimitha Muraleedharan (EE22D024)
Guide: Dr. Mahesh Kumar
Online meeting link: https://meet.google.com/dzs-unos-wbo
Date/Time: 13th October 2025 (Monday), 4:00 PM
Title: Voltage Ride-Through Strategy for Grid-Connected Dual Voltage Source Inverter under Unsymmetrical Fault Conditions

Abstract :

Symmetrical and unsymmetrical faults pose significant challenges to the operation of microgrids with integrated renewable energy sources. Unbalanced faults lead to deviations in point of common coupling (PCC) voltage and introduce negative sequence voltage components, driving the system away from its stable operating region.

This work proposes a unified voltage ride-through (VRT) scheme for a dual voltage source inverter-fed microgrid system to ride through unsymmetrical voltage sags and swells by regulating the PCC voltage while simultaneously minimizing the negative sequence voltage and oscillations in the injected active power with dual sequence current injection. Moreover, VRT is achieved by maintaining the PCC voltages within the nominal range through an appropriate generation of reference voltage. Thereby, consolidated control of positive and negative sequence voltage, oscillating power components, and phase voltage deviations at the PCC is achieved through the proposed VRT scheme, ensuring power quality and reliable operation within rated current limits. The developed control scheme is validated through simulation and experimental studies on the developed hardware prototype for various voltage scenarios.