Majlesi Journal of Electrical Engineering A Robust and Flexible Controller Based on Minimum Active Power Injection to Precise Tracking of Load Variation to Compensate Voltage Sag Volume 11 (2017) Issue 1, March 2017 2024 02 18 A Robust and Flexible Controller Based on Minimum Active Power Injection to Precise Tracking of Load Variation to Compensate Voltage Sag EN Ali Darvish Falehi Department of Electrical Engineering, Shahid Beheshti University, Tehran, IRAN Mansour Rafiee Department of Electrical Engineering, Shahid Beheshti University, Tehran, Iran Journal Article 2024 02 18 From the viewpoint of technology-driven custom apparatus, the dynamic voltage restorer (DVR) has been identified to be the most prominent device which can be engaged to compensate the voltage sag. On the other hand, this device has been customarily used in power distribution system to protect sensitive loads from sudden voltage sag. Owing to the restriction of energy storage in DVR's capacitors, it is essential that the active power injection by DVR to be reduced. As a consequence, this energy-saving strategy leads to the injecting the larger voltage magnitude and reactive power, shifting the phase, and cluttering the voltage wave shape. In the interim, this strategy is highly sensitive respect to variation in load’s power factor so that the compensating operation will not be properly done. In this regard, this paper suggests a robust controller based on minimum active power strategy in order to perfectly correct the voltage sag notwithstanding variation in load’s power factor. Likewise, the under-study DVR has been structured according to the cascaded H-bridge multilevel inverter topology.