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Designing power flow control devices using the power controller plane: An improved method
KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics (closed 20110930).
KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics (closed 20110930).
KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics (closed 20110930).ORCID iD: 0000-0002-1755-1365
(English)Article in journal (Other academic) Submitted
Abstract [en]

This paper introduces an improved method for design of Power Flow Controllers (PFC) in the power controller plane where the active power of the PFC line is plotted versus the difference in voltage angle between the PFC terminals. The power controller plane makes it possible to graphically visualize the working area of a PFC in a power grid and thus determine the grid situations which are dimensioning for the PFC. The paper extends the existing methods for design of PFC:s in the power controller plane by introducing a method to decouple the power grid- and PFC characteristics in a power system of arbitrary size. With this approach, it is possible to graphically compare and design PFC:s of different types and with different characteristics in the same plot by simple geometrical considerations. The method is intended to provide additional insight into how the power flow control capabilities of different PFC:s depend on the selected PFC characteristics and the grid conditions. Additionally, the method has the potential to simplify the process for selection and design of a PFC. The paper includes a study of the accuracy of the proposed method in two test systems of different complexity.

Keyword [en]
Flexible ac transmission systems (FACTS), Phase shifting transformer (PST), Power controller plane, Power flow control, Thyristor switched series capacitor (TSSC)
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-37916OAI: oai:DiVA.org:kth-37916DiVA: diva2:435655
Note
QS 2011 QS 20120327Available from: 2011-08-19 Created: 2011-08-19 Last updated: 2012-03-27Bibliographically 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.
Series
Trita-EE, ISSN 1653-5146 ; 2011:050
Keyword
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
Identifiers
urn:nbn:se:kth:diva-37823 (URN)978-91-7501-058-8 (ISBN)
Public defence
2011-09-09, KTH, Stockholm, 10:15 (English)
Opponent
Supervisors
Note
QC 20110819Available from: 2011-08-19 Created: 2011-08-17 Last updated: 2011-08-19Bibliographically approved

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Nee, Hans-Peter

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