Interconnected autonomous microgrids in smart grids with self-healing

Shahnia, Farhad, Chandrasena, Ruwan P.S., Rajakaruna, Sumedha, & Ghosh, Arindam (2014) Interconnected autonomous microgrids in smart grids with self-healing. In Hossain, Jahangir & Mahmud, Apel (Eds.) Renewable Energy Integration, Challenges and Solutions. Springer Singapore, Singapore, pp. 347-381.

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Abstract

In order to minimize the number of load shedding in a Microgrid during autonomous operation, islanded neighbour microgrids can be interconnected if they are on a self-healing network and an extra generation capacity is available in Distributed Energy Resources (DER) in one of the microgrids. In this way, the total load in the system of interconnected microgrids can be shared by all the DERs within these microgrids. However, for this purpose, carefully designed self-healing and supply restoration control algorithm, protection systems and communication infrastructure are required at the network and microgrid levels. In this chapter, first a hierarchical control structure is discussed for interconnecting the neighbour autonomous microgrids where the introduced primary control level is the main focus. Through the developed primary control level, it demonstrates how the parallel DERs in the system of multiple interconnected autonomous microgrids can properly share the load in the system. This controller is designed such that the converter-interfaced DERs operate in a voltage-controlled mode following a decentralized power sharing algorithm based on droop control. The switching in the converters is controlled using a linear quadratic regulator based state feedback which is more stable than conventional proportional integrator controllers and this prevents instability among parallel DERs when two microgrids are interconnected. The efficacy of the primary control level of DERs in the system of multiple interconnected autonomous microgrids is validated through simulations considering detailed dynamic models of DERs and converters.

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ID Code: 69798
Item Type: Book Chapter
Keywords: Interconnected microgrids, Self-healing network, Power sharing, DER, DSTATCOM
DOI: 10.1007/978-981-4585-27-9_15
ISBN: 9789814585262
ISSN: 1865-3529
Divisions: Current > Schools > School of Electrical Engineering & Computer Science
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2014 Springer Science+Business Media Singapore
Deposited On: 03 Apr 2014 22:12
Last Modified: 23 Aug 2016 16:02

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