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Coordinated control of multiple HVDC links using input-output exact linearization
KTH, School of Electrical Engineering (EES), Electric Power Systems.ORCID iD: 0000-0002-2356-4795
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: Electric power systems research, ISSN 0378-7796, E-ISSN 1873-2046, Vol. 80, no 12, 1406-1412 p.Article in journal (Refereed) Published
Abstract [en]

This paper is concerned with the investigation of a new control technique for the conventional High Voltage Direct Current (HVDC) link. The proposed technique relies upon nonlinear state feedback linearization of the AC/DC power system. The idea in input-output exact feedback linearization is to algebraically transform nonlinear systems dynamics into a linear control problem using a nonlinear pre-feedback loop, and then for the linearized power system one can design another feedback loop using a well established technique such as a linear-quadratic regulator. The primary goal of the controller presented in this paper is to contribute to the enhancement of both the transient and the small-signal stability of the power system. Since the proposed state feedback linearization does not rely on the assumption that there is only small deviation of the states from an equilibrium, the enhancement of both is feasible. The simulation results obtained in the framework of the study show that the proposed controller is capable of stabilizing the system in various system operating conditions.

Place, publisher, year, edition, pages
2010. Vol. 80, no 12, 1406-1412 p.
Keyword [en]
Nonlinear control, Coordinated control, High Voltage Direct Current (HVDC), Power system stability, Feedback linearization
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-26646DOI: 10.1016/j.epsr.2010.06.001ISI: 000282404500003Scopus ID: 2-s2.0-77956339406OAI: oai:DiVA.org:kth-26646DiVA: diva2:374272
Note
QC 20101203Available from: 2010-12-03 Created: 2010-11-26 Last updated: 2017-12-12Bibliographically 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.
Series
Trita-EE, ISSN 1653-5146 ; 2011:004
Keyword
coordinated control, dynamic security, exact-feedback linearization, feedforward control, HVDC poser modulation
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
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)
Opponent
Supervisors
Note
QC 20110302Available from: 2011-03-02 Created: 2011-03-01 Last updated: 2011-03-02Bibliographically approved

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Söder, Lennart

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