NDLI: Dual-stage cascaded control to resynchronise an isolated microgrid with the utility

Content Provider	IET Digital Library
Author	Chandak, Sheetal Bhowmik, Pritam Rout, Pravat Kumar
Abstract	This study proposes a dual-stage cascaded operational control to attain a seamless transition of a standalone microgrid to a grid-connected microgrid system. In order to safeguard the microgrid's stability, the strategy incorporates a bi-directional converter. A dynamic reference frequency loop-based resynchronisation controller is proposed to control the operation of the bi-directional converter. The stage-I operates to maintain the converter end system parameters equal to the utility. This creates a pseudo-equalisation between the converter connected microgrid parameters and the utility. As a result, the simultaneously operating synchroniser controller switches the resynchronisation switch. The stage-II of the proposed strategy addresses the transition controller, which switches the microgrid's mode of operation from standalone mode to grid-connected mode. The grid connected bi-directional converter-based microgrid builds up its parameter equal to the utility. When microgrid builds up to a level that it satisfies the set values of the bypassing controller, it signals the bypassing switch (BS) to operate. In this study, the BS plays an essential role in bypassing the bi-directional converter. The test system designed to study the proposed strategy is simulated on the podium of Matlab 2015b/Simulink.
Starting Page	871
Ending Page	880
Page Count	10
ISSN	17521416
Volume Number	14
e-ISSN	17521424
Issue Number	Issue 5, Apr (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-rpg/14/5
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-rpg.2019.0062
Journal	IET Renewable Power Generation
Publisher Date	2019-07-01
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	Bypassing Controller Cascade Control Control of Electric Power System Converter End System Parameter Distributed Power Generation Dual-stage Cascaded Operational Control Dynamic Reference Frequency Loop-based Resynchronisation Controller Grid Connected Bi-directional Converter Grid-connected Microgrid System Grid-connected Mode Isolated Microgrid Microgrid Parameter Power Converter Power Distribution Control Power Grid Power Supplies to Apparatus Power System Control Power System Stability Resynchronisation Switch Seamless Transition Simultaneously Operating Synchroniser Controller Standalone Microgrid Standalone Mode Synchronisation Transition Controller
Content Type	Text
Resource Type	Article
Subject	Renewable Energy, Sustainability and the Environment

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1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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