Enhancing Reliable Performance of Microgrids With Autonomous Control of Distributed Energy Resources
Date of Award
5-2026
Document Type
Dissertation
Degree Name
Doctor of Philosophy (PhD)
Department
Electrical and Computer Engineering (Holcomb Dept. of)
Committee Chair/Advisor
Ramtin Hadidi
Committee Member
Johan Enslin
Committee Member
Dingrui Li
Committee Member
Gokhan Ozkan
Abstract
This dissertation presents a comprehensive investigation into enhancing the reliability, efficiency, and autonomous operation of modern power networks through advanced microgrid integration and control strategies. The research addresses critical challenges across three interconnected domains: microgrid control, thermodynamic modeling of heat recovery system (HRS), and optimal distribution network reliability.
In the realm of microgrid control, this work introduces novel methodologies for grid forming inverter-based resources (IBRs). A significant contribution is the development and validation of an "Auto Frequency Change" controller, which drastically reduces microgrid synchronization time with the main grid from several minutes to approximately four seconds, with theoretical potential for one-second synchronization. An "Auto Frequency Adjustment (FixFreq control)" mechanism is detailed for precise frequency regulation in islanded microgrids, ensuring stability even under fluctuating load conditions. Furthermore, robust "Over Current Mitigation Control" and "Load Shedding Control" mechanisms are presented, providing communication-free solutions for inverter protection and system stability during overload events. A novel communication-free grid reconnection method is also developed, enabling autonomous transition from islanded to grid-connected mode by monitoring active power and frequency at the Point of Common Coupling (PCC). These control strategies were rigorously modeled and validated using real-time digital simulation (RTDS), confirming their practical efficacy.
Recommended Citation
Liasi, Sahand, "Enhancing Reliable Performance of Microgrids With Autonomous Control of Distributed Energy Resources" (2026). All Dissertations. 4208.
https://open.clemson.edu/all_dissertations/4208
Author ORCID Identifier
https://orcid.org/0000-0002-3421-3376