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Hybrid generators-based AC microgrid performance assessment in island mode

Hybrid generators-based AC microgrid performance assessment in island mode
Hybrid generators-based AC microgrid performance assessment in island mode
Achieving an accurate steady-state averaged active power sharing between parallel inverters in islanded AC microgrids could be realized by a traditional droop control. For identical inverters having the same droop gains, it is assumed that the transient average power responses will be similar, and no circulating current will flow between the units. However, different line impedances could influence the instantaneous power significantly and thus circulating power flows among the inverters particularly during sudden disturbances such as load changes. This power, if absorbed by an inverter, will lead the DC link voltage to rise abruptly and trip the inverter, thus, degrading the performance of the whole microgrid. The problem becomes worse when hybrid generators are serving as unidirectional power source. This paper assesses the performance of hybrid generators within an islanded microgrid against the mismatch in line impedances. Two schemes to stabilize the microgrid are proposed. In addition, a participation factor analysis is developed to select the most effective controller scheme to bound the DC link voltage and minimize the circulating power. Simulation and experimental results are presented to verify the analysis and the capability of the proposed controller.
0377-2063
1973-1980
Issa, Walid
539ed2e1-38ee-436c-b7c2-4678fb116f1d
Sharkh, Suleiman
c8445516-dafe-41c2-b7e8-c21e295e56b9
Abusara, Mohammad
4b927b5e-0c68-45bb-8d01-4c22d94ccc7a
Issa, Walid
539ed2e1-38ee-436c-b7c2-4678fb116f1d
Sharkh, Suleiman
c8445516-dafe-41c2-b7e8-c21e295e56b9
Abusara, Mohammad
4b927b5e-0c68-45bb-8d01-4c22d94ccc7a

Issa, Walid, Sharkh, Suleiman and Abusara, Mohammad (2019) Hybrid generators-based AC microgrid performance assessment in island mode. IETE Journal of Research, 12 (8), 1973-1980. (doi:10.1049/iet-pel.2018.5295).

Record type: Article

Abstract

Achieving an accurate steady-state averaged active power sharing between parallel inverters in islanded AC microgrids could be realized by a traditional droop control. For identical inverters having the same droop gains, it is assumed that the transient average power responses will be similar, and no circulating current will flow between the units. However, different line impedances could influence the instantaneous power significantly and thus circulating power flows among the inverters particularly during sudden disturbances such as load changes. This power, if absorbed by an inverter, will lead the DC link voltage to rise abruptly and trip the inverter, thus, degrading the performance of the whole microgrid. The problem becomes worse when hybrid generators are serving as unidirectional power source. This paper assesses the performance of hybrid generators within an islanded microgrid against the mismatch in line impedances. Two schemes to stabilize the microgrid are proposed. In addition, a participation factor analysis is developed to select the most effective controller scheme to bound the DC link voltage and minimize the circulating power. Simulation and experimental results are presented to verify the analysis and the capability of the proposed controller.

Text
2019-Issa Sharkh Abusara-IET-PEL.2018.5295 (1)-Hybrid Gnenerators-based AC microgrid - Accepted Manuscript
Restricted to Repository staff only until 3 April 2020.
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More information

Accepted/In Press date: 3 April 2019
e-pub ahead of print date: 18 July 2019
Published date: 7 October 2019

Identifiers

Local EPrints ID: 430026
URI: https://eprints.soton.ac.uk/id/eprint/430026
ISSN: 0377-2063
PURE UUID: d4a72320-e4e2-4de1-b1a0-687933881a4d

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Date deposited: 10 Apr 2019 16:30
Last modified: 26 Jul 2019 16:30

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