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Consensus virtual output impedance control based on the novel droop equivalent impedance concept for a multi-bus radial microgrid

Consensus virtual output impedance control based on the novel droop equivalent impedance concept for a multi-bus radial microgrid
Consensus virtual output impedance control based on the novel droop equivalent impedance concept for a multi-bus radial microgrid
Most of the existing reactive power sharing schemes that assume parallel architecture are known to be less effective for multi-bus radial microgrids. This paper proposes an improved reactive power sharing scheme that exploits the novel concept of droop equivalent impedance into designing a consensus virtual-output-impedance-based droop control scheme. The control scheme leads to two notable improvements: (a) it proves that only either virtual resistance or virtual reactance is sufficient to restore proportionate reactive power sharing; (b) only a global coupling gain needs to be tuned and no proportional-integral controller is required. A systematic guideline that establishes the approximate range of stable coupling gain is developed. This simplifies the tuning process of the coupling gain. The power correction performance, the resulting bus voltage behavior, consensus control stability, and the robustness to time delay have been investigated in conjunction with an islanded microgrid modified from the IEEE 34 Node Test Feeder. It is shown that the consensus control scheme is capable to demonstrate accurate power sharing regardless of the changes in the network topology, network impedances, loading conditions, and communication delay.
Droop control,, adaptive virtual output impedance., radial microgrid,, reactive power sharing,
0885-8969
1078-1087
Wong, Yi Chyn Cassandra
1588a283-b610-4dd6-86d1-a3f960e7362b
Cruden, Andrew
ed709997-4402-49a7-9ad5-f4f3c62d29ab
Lim, Chee
616d0697-a5d5-4079-adaa-6686e5a758fe
Rotaru, Mihai D
c53c5038-2fed-4ace-8fad-9f95d4c95b7e
Xin, Kong
420fe9af-bd5a-4826-a9cb-f179843a42a4
Wong, Yi Chyn Cassandra
1588a283-b610-4dd6-86d1-a3f960e7362b
Cruden, Andrew
ed709997-4402-49a7-9ad5-f4f3c62d29ab
Lim, Chee
616d0697-a5d5-4079-adaa-6686e5a758fe
Rotaru, Mihai D
c53c5038-2fed-4ace-8fad-9f95d4c95b7e
Xin, Kong
420fe9af-bd5a-4826-a9cb-f179843a42a4

Wong, Yi Chyn Cassandra, Cruden, Andrew, Lim, Chee, Rotaru, Mihai D and Xin, Kong (2020) Consensus virtual output impedance control based on the novel droop equivalent impedance concept for a multi-bus radial microgrid. IEEE Transactions on Energy Conversion, 35 (2), 1078-1087, [8985387]. (doi:10.1109/TEC.2020.2972002).

Record type: Article

Abstract

Most of the existing reactive power sharing schemes that assume parallel architecture are known to be less effective for multi-bus radial microgrids. This paper proposes an improved reactive power sharing scheme that exploits the novel concept of droop equivalent impedance into designing a consensus virtual-output-impedance-based droop control scheme. The control scheme leads to two notable improvements: (a) it proves that only either virtual resistance or virtual reactance is sufficient to restore proportionate reactive power sharing; (b) only a global coupling gain needs to be tuned and no proportional-integral controller is required. A systematic guideline that establishes the approximate range of stable coupling gain is developed. This simplifies the tuning process of the coupling gain. The power correction performance, the resulting bus voltage behavior, consensus control stability, and the robustness to time delay have been investigated in conjunction with an islanded microgrid modified from the IEEE 34 Node Test Feeder. It is shown that the consensus control scheme is capable to demonstrate accurate power sharing regardless of the changes in the network topology, network impedances, loading conditions, and communication delay.

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IEEETEC2019-2020
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More information

e-pub ahead of print date: 4 February 2020
Published date: 6 February 2020
Keywords: Droop control,, adaptive virtual output impedance., radial microgrid,, reactive power sharing,

Identifiers

Local EPrints ID: 438831
URI: http://eprints.soton.ac.uk/id/eprint/438831
ISSN: 0885-8969
PURE UUID: f282be9c-ee40-4959-ac13-5394063a52be
ORCID for Andrew Cruden: ORCID iD orcid.org/0000-0003-3236-2535

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Date deposited: 25 Mar 2020 17:31
Last modified: 15 Sep 2021 01:59

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