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Improved reactive power sharing for parallel-operated inverters in islanded microgrids

Improved reactive power sharing for parallel-operated inverters in islanded microgrids
Improved reactive power sharing for parallel-operated inverters in islanded microgrids
The unequal impedances of the interconnecting cables between paralleled inverters in the island mode of microgrids cause inaccurate reactive power sharing when the traditional droop control is used. Many studies in the literature adopt low speed communications between the inverters and the central control unit to overcome this problem. However, the losses of this communication link can be very detrimental to the performance of the controller. This paper proposes an improved reactive power-sharing control method. It employs infrequent measurements of the voltage at the point of common coupling (PCC) to estimate the output impedance between the inverters and the PCC and then readjust the voltage droop controller gains accordingly. The controller then reverts to being a traditional droop controller using the newly calculated gains. This increases the immunity of the controller against any losses in the communication links between the central control unit and the inverters. The capability of the proposed control method has been demonstrated by simulation and experimental results using a laboratory scale microgrid.
1598-2092
1152-1162
Issa, Walid
539ed2e1-38ee-436c-b7c2-4678fb116f1d
Sharkh, Suleiman
c8445516-dafe-41c2-b7e8-c21e295e56b9
Malik, Tapas
8616c913-ea5c-4e10-a8b3-bb9aae2d364b
Abusara, Mohammad
cde8e173-f938-4210-8b9d-d1bf3a9a429a
Issa, Walid
539ed2e1-38ee-436c-b7c2-4678fb116f1d
Sharkh, Suleiman
c8445516-dafe-41c2-b7e8-c21e295e56b9
Malik, Tapas
8616c913-ea5c-4e10-a8b3-bb9aae2d364b
Abusara, Mohammad
cde8e173-f938-4210-8b9d-d1bf3a9a429a

Issa, Walid, Sharkh, Suleiman, Malik, Tapas and Abusara, Mohammad (2016) Improved reactive power sharing for parallel-operated inverters in islanded microgrids. Journal of Power Electronics, 16 (3), 1152-1162. (doi:10.6113/JPE.2016.16.3.1152).

Record type: Article

Abstract

The unequal impedances of the interconnecting cables between paralleled inverters in the island mode of microgrids cause inaccurate reactive power sharing when the traditional droop control is used. Many studies in the literature adopt low speed communications between the inverters and the central control unit to overcome this problem. However, the losses of this communication link can be very detrimental to the performance of the controller. This paper proposes an improved reactive power-sharing control method. It employs infrequent measurements of the voltage at the point of common coupling (PCC) to estimate the output impedance between the inverters and the PCC and then readjust the voltage droop controller gains accordingly. The controller then reverts to being a traditional droop controller using the newly calculated gains. This increases the immunity of the controller against any losses in the communication links between the central control unit and the inverters. The capability of the proposed control method has been demonstrated by simulation and experimental results using a laboratory scale microgrid.

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More information

Accepted/In Press date: 7 December 2015
Published date: May 2016
Organisations: Mechatronics

Identifiers

Local EPrints ID: 404444
URI: http://eprints.soton.ac.uk/id/eprint/404444
ISSN: 1598-2092
PURE UUID: a2e0b4cb-e969-4385-8d21-f8a6b94c480b

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Date deposited: 07 Feb 2017 11:56
Last modified: 16 Dec 2019 19:32

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Contributors

Author: Walid Issa
Author: Suleiman Sharkh
Author: Tapas Malik
Author: Mohammad Abusara

University divisions

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