Distributed Control Strategy Based on a Consensus Algorithm and on the Conservative Power Theory for Imbalance and Harmonic Sharing in 4-Wire Microgrids

Burgos-Mellado, Claudio; Llanos, Jacqueline; Cardenas, Roberto; Saez, Doris; Olivares, Daniel E.; Sumner, Mark; Costabeber, Alessandro

Abstract

A distributed control system is proposed which uses the Conservative Power Theory (CPT) and a consensus algorithm to share imbalance and harmonics between different converters in three-phase four-wire droop-controlled Microgrids (MGs). The CPT is used to identify the balanced, unbalanced and distorted components of the currents and powers in the system. Control loops based on virtual impedance and implemented in the stationary a-b-c frame are then used to distribute these components between the various converters in the MG. The magnitudes of the virtual impedances are adaptively calculated using a novel consensus-based distributed control scheme with the aim of sharing imbalances and harmonics according to the residual VA capacity of each converter whilst regulating the imbalance and distortion at their output to meet the appropriate IEEE power quality standards. Extensive simulations show that the proposed distributed control has excellent performance, and experimental validation is provided using a laboratory-scale 4-wire MG.

Citation

Burgos-Mellado, C., Llanos, J., Cardenas, R., Saez, D., Olivares, D. E., Sumner, M., & Costabeber, A. (2020). Distributed Control Strategy Based on a Consensus Algorithm and on the Conservative Power Theory for Imbalance and Harmonic Sharing in 4-Wire Microgrids. IEEE Transactions on Smart Grid, 11(2), 1604 -1619. https://doi.org/10.1109/tsg.2019.2941117

• Journal Article Type: Article
• Acceptance Date: Sep 5, 2019
• Online Publication Date: Sep 12, 2019
• Publication Date: 2020-03
• Deposit Date: Nov 22, 2019
• Publicly Available Date: Nov 25, 2019
• Journal: IEEE Transactions on Smart Grid
• Print ISSN: 1949-3053
• Electronic ISSN: 1949-3061
• Publisher: Institute of Electrical and Electronics Engineers
• Peer Reviewed: Peer Reviewed
• Volume: 11
• Issue: 2
• Pages: 1604 -1619
• DOI: https://doi.org/10.1109/tsg.2019.2941117
• Keywords: 4-wire Microgrids, CPT, imbalance sharing, Harmonic sharing, Distributed control, Consensus algorithm
• Public URL: https://nottingham-repository.worktribe.com/output/2773493
• Publisher URL: https://ieeexplore.ieee.org/document/8834868
• Additional Information: © 2019 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, 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 component of this work in other works.
• Contract Date: Nov 22, 2019