NDLI: Analysis and mitigation of low-frequency oscillations in hybrid AC/DC microgrids with dynamic loads

Content Provider	IET Digital Library
Author	Ahmed, Moudud Meegahapola, Lasantha Vahidnia, Arash Datta, Manoj
Abstract	The microgrid concept has gained enormous popularity in the power industry due to recent advances in the power electronic converter (PEC) technology and environmental concerns over green-house gas emissions from power generation. Among microgrids, the hybrid AC/DC microgrid concept has been promoted as a viable concept to reduce energy conversion losses. However, hybrid AC/DC microgrids are susceptible to stability issues during high penetration of dynamic loads (e.g. induction machines). The non-linear dynamics of induction machines result in sustained voltage/frequency oscillations following disturbances in the microgrid, which is a major challenge for stable operation of the hybrid AC/DC microgrid. The PEC-based energy storage systems (ESSs) are used as an effective solution for power balancing in the microgrid; hence with the fast response of the PEC, microgrid voltage/frequency could be stabilised rapidly. Thus, a supplementary power oscillation damping (POD) controller is proposed in this paper for the ESS to damp low-frequency oscillations (LFOs) in the hybrid AC/DC microgrid. The effectiveness of the proposed damping controller is verified using non-linear simulations considering different penetration levels of dynamic loads and disturbances in a hybrid AC/DC microgrid. Results indicate that the proposed supplementary POD controller can significantly damp the LFOs in the hybrid AC/DC microgrid.
Starting Page	1477
Ending Page	1488
Page Count	12
ISSN	17518687
Volume Number	13
e-ISSN	17518695
Issue Number	Issue 9, May (2019)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-gtd/13/9
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2018.5274
Journal	IET Generation, Transmission & Distribution
Publisher Date	2019-02-19
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	AC-DC Power Converter Control of Electric Power System Damping Distributed Power Generation Dynamic Loads Energy Conversion Loss Reduction Energy Storage ESS Hybrid AC/DC Microgrid Concept Induction Machine Low-frequency Oscillation Mitigation Microgrid Voltage/frequency Nonlinear Dynamics Nonlinear Simulations Oscillation PEC Technology PEC-based Energy Storage System POD Controller Power Electronic Converter Technology Power Electronics Power Generation Control Power System Control Power System Stability Supplementary Power Oscillation Damping Controller Sustained Frequency Oscillation Sustained Voltage Oscillation
Content Type	Text
Resource Type	Article
Subject	Control and Systems Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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