Zhong, Q. and Konstantopoulos, G. orcid.org/0000-0003-3339-6921 (2017) Current-Limiting Droop Control of Grid-connected Inverters. IEEE Transactions on Industrial Electronics, 64 (7). pp. 5963-5973. ISSN 0278-0046
Abstract
A current-limiting droop controller is proposed for single-phase grid-connected inverters with an LCL filter that can operate under both normal and faulty grid conditions. The controller introduces bounded nonlinear dynamics and, by using nonlinear input-to-state stability theory, the current-limiting property of the inverter is analytically proven. The proposed controller can be operated in the set mode to accurately send the desired power to the grid or in the droop mode to take part in the grid regulation, while maintaining the inverter current below a given value at all times. Opposed to the existing current-limiting approaches, the current limitation is achieved without external limiters, additional switches or monitoring devices and the controller remains a continuous-time system guaranteeing system stability. Furthermore, this is achieved independently from grid voltage and frequency variations, maintaining the desired control performance under grid faults as well. Extensive experimental results are presented to verify the droop function of the proposed controller and its current-limiting capability under normal and faulty grid conditions.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2016 IEEE. This is an author produced version of a paper subsequently published in IEEE Transactions on Industrial Electronics. Uploaded in accordance with the publisher's self-archiving policy. |
Keywords: | inverter; current-limiting property; droop control; nonlinear stability; fault ride-through |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Automatic Control and Systems Engineering (Sheffield) |
Funding Information: | Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL (EPSRC) EP/J01558X/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 14 Oct 2016 10:23 |
Last Modified: | 29 Jan 2018 11:01 |
Published Version: | https://doi.org/10.1109/TIE.2016.2622402 |
Status: | Published |
Publisher: | Institute of Electrical and Electronics Engineers (IEEE) |
Refereed: | Yes |
Identification Number: | 10.1109/TIE.2016.2622402 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:105999 |