Braitor, A.-C., Konstantopoulos, G.-C. and Kadirkamanathan, V. (2021) Enhanced primary droop controller for meshed DC micro-grids with overvoltage protection. In: Proceedings of the 29th Mediterranean Conference on Control and Automation (MED 2021). MED 2021 : 29th Mediterranean Conference on Control and Automation, 22-25 Jun 2021, Bari, Puglia, Italy. IEEE , pp. 368-373. ISBN 9781665446600
Abstract
Droop control represents the key grid-forming control strategy in modern micro-grids consisting of multiple distributed energy resources (DERs), implemented at the primary control layer of the hierarchical control architecture. In this paper, an enhanced droop control methodology for meshed DC micro-grids with constant power loads (CPLs) is proposed, which inherits the conventional droop control features and additionally guarantees a crucial overvoltage protection property of each DER unit, independently from each other or the loads. Since one of the main challenges in DC micro-grids is that CPLs introduce negative impedance characteristics that can lead to system instability, in this paper, based on the proposed novel control structure and using nonlinear ultimate boundedness theory, an upper limit for the output voltage is rigorously guaranteed. In addition, asymptotic stability to the desired equilibrium for the closed-loop system is analytically proven, and detailed conditions are derived to guide the control design. Simulation testing is performed for a meshed DC micro-grid to verify the theoretical contribution and the effectiveness of the proposed primary droop controller.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | Asymptotic stability; Optimal control; Supervisory control; Power system stability; Stability analysis; Impedance; Voltage control |
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 EP/S001107/1; EP/S031863/1 |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 27 Apr 2021 08:12 |
Last Modified: | 15 Jul 2022 00:13 |
Status: | Published |
Publisher: | IEEE |
Refereed: | Yes |
Identification Number: | 10.1109/MED51440.2021.9480294 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:173288 |