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Distributed Frequency Control Through MTDC Transmission Systems
KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.ORCID iD: 0000-0001-7309-8086
KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.ORCID iD: 0000-0001-9940-5929
2017 (English)In: IEEE Transactions on Power Systems, ISSN 0885-8950, E-ISSN 1558-0679, Vol. 32, no 1, p. 250-260, article id 7456314Article in journal (Refereed) Published
##### Abstract [en]

In this paper, we propose distributed dynamic controllers for sharing both frequency containment and restoration reserves of asynchronous ac systems connected through a multi-terminal HVDC (MTDC) grid. The communication structure of the controller is distributed in the sense that only local and neighboring state information is needed, rather than the complete state. We derive sufficient stability conditions, which guarantee that the ac frequencies converge to the nominal frequency. Simultaneously, a global quadratic power generation cost function is minimized. The proposed controller also regulates the voltages of the MTDC grid, asymptotically minimizing a quadratic cost function of the deviations from the nominal dc voltages. The results are valid for distributed cable models of the HVDC grid (e.g., $\pi$-links), as well as ac systems of arbitrary number of synchronous machines, each modeled by the swing equation. We also propose a decentralized communication-free version of the controller. The proposed controllers are tested on a high-order dynamic model of a power system consisting of asynchronous ac grids, modeled as IEEE 14 bus networks, connected through a six-terminal HVDC grid. The performance of the controller is successfully evaluated through simulation. © 1969-2012 IEEE.

##### Place, publisher, year, edition, pages
IEEE Press, 2017. Vol. 32, no 1, p. 250-260, article id 7456314
##### Keywords [en]
Distributed control, HVDC transmission, power system dynamics, power system stability, Controllers, Cost functions, DC power transmission, Distributed parameter control systems, Electric power transmission, HVDC power transmission, System stability, Communication structures, Decentralized communications, Quadratic cost functions, Transmission systems, Electric power system control
##### National Category
Electrical Engineering, Electronic Engineering, Information Engineering
##### Identifiers
ISI: 000391741100024Scopus ID: 2-s2.0-85008627342OAI: oai:DiVA.org:kth-202253DiVA, id: diva2:1076089
##### Note

Funding text: This work was supported in part by the European Commission, the Swedish Research Council (VR), and the Knut and Alice Wallenberg Foundation. Paper no. TPWRS-00969-2015. QC 20170222

Available from: 2017-02-22 Created: 2017-02-22 Last updated: 2017-11-29Bibliographically approved

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Dimarogonas, Dimos V.Johansson, Karl H.

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Andreasson, MartinDimarogonas, Dimos V.Johansson, Karl H.
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