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An Adaptive Controller for Power System Stability Improvement and Power Flow Control by Means of a Thyristor Switched Series Capacitor (TSSC)
KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics.
KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics.
KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics.ORCID iD: 0000-0002-1755-1365
2010 (English)In: IEEE Transactions on Power Systems, ISSN 0885-8950, Vol. 25, no 1, 381-391 p.Article in journal (Refereed) Published
Abstract [en]

In this paper, a controller for a thyristor switched series capacitor (TSSC) is presented. The controller aims to stabilize the power system by damping interarea power oscillations and by improving the transient stability of the system. In addition to this, a power flow control feature is included in the controller. The power oscillation damping controller is designed based on a nonlinear control law, while the transient stability improvement feature works in open loop. The damping controller is adaptive and estimates the power system parameters according to a simplified generic model of a two-area power system. It is designed for systems where one poorly damped dominant mode of power oscillation exists. In the paper, a verification of the controller by means of digital simulations of one two-area, four-machine power system, and one 23-machine power system is presented. The results show that the controller improves the stability of both test systems significantly in a number of fault cases at different levels of interarea power flow.

Place, publisher, year, edition, pages
2010. Vol. 25, no 1, 381-391 p.
Keyword [en]
Power flow control, power oscillation damping (POD), thyristor, controlled series capacitor (TCSC), thyristor switched series capacitor, (TSSC), transient stability, interarea oscillations, design, strategy, model
URN: urn:nbn:se:kth:diva-19144DOI: 10.1109/tpwrs.2009.2036484ISI: 000273930800040ScopusID: 2-s2.0-76649100765OAI: diva2:337191
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-08-19Bibliographically approved
In thesis
1. Aspects on Dynamic Power Flow Controllers and Related Devices for Increased Flexibility in Electric Power Systems
Open this publication in new window or tab >>Aspects on Dynamic Power Flow Controllers and Related Devices for Increased Flexibility in Electric Power Systems
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This thesis studies different aspects of Flexible AC Transmission System (FACTS) devices which are used to improve the power transfer capability and increase the controllability in electric power systems. In the thesis, different aspects on the usage and control of Dynamic Power Flow Controllers (DPFC) and related FACTS devices are studied. The DPFC is a combination of a Phase Shifting Transformer (PST) and a Thyristor Switched Series Capacitor (TSSC)/Thyristor Switched Series Reactor (TSSR).

The thesis proposes and studies a new method, the Ideal Phase-Shifter (IPS) method, for selection and rating of Power Flow Controllers (PFC) in a power grid. The IPS method, which is based on steady-state calculations, is proposed as a first step in the design process for a PFC. The method uses the Power controller plane, introduced by Brochu et al in 1999. The IPS method extends the usage of decoupling methods in the Power controller plane to a power system of arbitrary size. The IPS method was in the thesis used to compare the ratings of different PFC:s required to improve the power transfer capability in two test systems. The studied devices were here the PST, the TSSC/TSSR and the DPFC.

The thesis treats control of ideal Controlled Series Capacitors (CSC), TCSC, TSSC/TSSR, and DPFC. The goals of the FACTS controllers which are developed are Power Oscillation Damping (POD), fast power flow control, and transient stability improvement in the power system. New adaptive control strategies for POD and power flow control are proposed and studied in different models of power systems by time-domain simulations. A strategy for transient stability improvement is also proposed and studied.

Additionally, different methods for study of Subsynchronous Resonance (SSR), which is associated with series compensation in power systems, are investigated. Here, four of the most common methods for frequency scanning to determine the electrical damping of subsynchronous oscillations in a power grid are studied. The study reveals significant differences of the electrical damping estimates of the studied standard methods when applied to a four-machine test system.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology - KTH, Stockholm, Sweden, 2011. x, 131 p.
Trita-EE, ISSN 1653-5146 ; 2011:050
Adaptive Control, Controlled Series Compensator, Dynamic Power Flow Controller, Frequency Scanning, Phase-Shifting Transformer, Power Controller Plane, Power Flow Control, Power Oscillation Damping, Subsynchronous Resonance, Thyristor Controlled Series Compensator, Thyristor Switched Series Compensator, Transient Stability
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
urn:nbn:se:kth:diva-37823 (URN)978-91-7501-058-8 (ISBN)
Public defence
2011-09-09, KTH, Stockholm, 10:15 (English)
QC 20110819Available from: 2011-08-19 Created: 2011-08-17 Last updated: 2011-08-19Bibliographically approved

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