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Coordinated control design of multiple HVDC links based on model identification
KTH, School of Electrical Engineering (EES), Electric Power Systems.
KTH, School of Electrical Engineering (EES), Electric Power Systems.ORCID iD: 0000-0002-8189-2420
2010 (English)In: Computers and Mathematics with Applications, ISSN 0898-1221, Vol. 60, no 4, 944-953 p.Article in journal (Refereed) Published
Abstract [en]

This paper presents a method for designing a centralized coordinated controller for several HVDC links. The controller increases the damping of the power oscillations by modulating the current through the HVDC links in a coordinated fashion. To design a centralized coordinated controller a reduced order open system model is estimated. The open system model of the power system is estimated using the Numerical Algorithms for Subspace State-Space System Identification (N4SID) algorithm which is a black-box system identification technique. The current set-point change through the HVDC links is the set of input signals and the speeds of the generators are the set of outputs. This controller design method increases the damping significantly, which is shown for a small power system.

Place, publisher, year, edition, pages
2010. Vol. 60, no 4, 944-953 p.
Keyword [en]
Coordinated control, HVDC link, Modal analysis, Small signal stability, System identification
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-29234DOI: 10.1016/j.camwa.2010.02.037ISI: 000281175200003ScopusID: 2-s2.0-77955428022OAI: diva2:392881
QC 20110128Available from: 2011-01-28 Created: 2011-01-27 Last updated: 2011-03-02Bibliographically approved
In thesis
1. Coordinated Control of HVDC Links in Transmission Systems
Open this publication in new window or tab >>Coordinated Control of HVDC Links in Transmission Systems
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Dynamic security limits the power transfer capacity between regions and therefore has an economic impact. The power modulation control of high-voltage direct current (HVDC) links can improve the dynamic security of the power system. Having several HVDC links in a system creates the opportunity to coordinate such control, and coordination also ensures that negative interactions do not occur among the controllable devices.

This thesis aims to increase dynamic security by coordinating HVDC links, as an alternative to decreasing the transfer capacity. This thesis contributes four control approaches for increasing the dynamic stability, based on feedforward control, adaptive control, optimal control, and exact-feedback linearization control. Depending on the available measurements, dynamic system model, and system topology, one of the developed methods can be applied. The wide-area measurement system provides the central controller with real-time data and sends control signals to the HVDC links.

The feedforward controller applies rapid power dispatch, and the strategy used here is to link the N-1 criterion between two systems. The adaptive controller uses the modal analysis approach; based on forecasted load paths, the controller gains are adaptively adjusted to maximize the damping in the system. The optimal controller is designed based on an estimated reduced-order model; system identification develops the model based on the system response. The exact-feedback linearization approach uses a pre-feedback loop to cancel the nonlinearities; a stabilizing controller is designed for the remaining linear system.

The conclusion is that coordinating the HVDC links improves the dynamic stability, which makes it possible to increase the transfer capacity. This conclusion is also supported by simulations of each control approach.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. x, 51 p.
Trita-EE, ISSN 1653-5146 ; 2011:004
coordinated control, dynamic security, exact-feedback linearization, feedforward control, HVDC poser modulation
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
urn:nbn:se:kth:diva-30625 (URN)978-91-7415-875-5 (ISBN)
Public defence
2011-03-24, Sal K2, Teknikringen 28, Entréplan, KTH, Stockholm, 10:00 (English)
QC 20110302Available from: 2011-03-02 Created: 2011-03-01 Last updated: 2011-03-02Bibliographically approved

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