NDLI: Robust tuning of transient droop gains based on Kharitonov's stability theorem in droop-controlled microgrids

Content Provider	IET Digital Library
Author	Dehkordi, Nima Mahdian Sadati, Nasser Hamzeh, Mohsen
Abstract	This study addresses the robust stability analysis for an islanded microgrid with droop-controlled inverter-based distributed generators (DGs). Owing to large load changes, microgrid structure reconfiguration, and higher-power demands, the low-frequency (LF) dominant modes of a microgrid stir toward unstable zone and make the system more oscillatory or even unstable. In this study, a robust two-degree-of-freedom (2DOF) decentralised droop controller, which is the combination of the conventional droop with a robust transient droop function, is utilised for each inverter-based DG unit. Unlike conventional tuning of 2DOF droop controllers, a new design procedure is proposed to robustly determine the transient droop gains to effectively damp the LF oscillatory modes of the islanded microgrid irrespective of disturbances, equilibrium point variations, and uncertain parameters of a microgrid. To mitigate the LF power oscillations at different microgrid conditions, inspired by Kharitonov's stability theorem, a robust D-stability analysis is performed to determine the specific ranges of the transient droop gains to provide a robustness margin for the disturbances, equilibrium point variations, and uncertain parameters of the islanded microgrid. Finally, digital time-domain simulation studies are performed in MATLAB/SimPowerSystems software environment to verify the effectiveness of the proposed method.
Starting Page	3495
Ending Page	3501
Page Count	7
ISSN	17518687
Volume Number	12
e-ISSN	17518695
Issue Number	Issue 14, Aug (2018)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/12/14
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2017.1767
Journal	IET Generation, Transmission & Distribution
Publisher Date	2018-05-15
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	2DOF Decentralised Droop Controller 2DOF Droop Controller Tuning Control of Electric Power System Control System Analysis Control System Synthesis Decentralised Control Design Procedure Distributed Power Generation Droop-controlled Inverter-based Distributed Generators Droop-controlled Microgrid Equilibrium Point Variations Inverter-based DG Unit Invertors Islanded Microgrid Uncertain Parameter Kharitonov Stability Theorem LF Oscillatory Mode LF Power Oscillation Minimization Low-frequency Dominant Mode MATLAB-SimPowerSystem Software Environment Microgrid Structure Reconfiguration Multivariable Control System Power Demands Power Generation Control Power System Control Power System Transient Stability Robust Control Robust D-stability Analysis Robust Stability Analysis Robust Transient Droop Function Robust Tuning Robust Two-degree-of-freedom Decentralised Droop Controller Stability in Control Theory Synthesis Method Transient Droop Gain
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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