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A Comparison of Different Frequency Scanning Methods for Study of Subsynchronous Resonance
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
2011 (English)In: IEEE Transactions on Power Systems, ISSN 0885-8950, E-ISSN 1558-0679, Vol. 26, no 1, 356-363 p.Article in journal (Refereed) Published
Abstract [en]

This paper compares four different methods for determining the electrical damping of a power system seen from one generator as a function of frequency. This information is useful when the risk for subsynchronous resonance (SSR) in the system is evaluated. The study compares one frequency scanning method which is implemented in a time-domain digital simulation program with three methods of different complexity based on analytical calculations. The time-domain simulation method is easily implemented with a detailed model of the power system including complex load and generator models, whereas the analytical methods are based on simpler models of the power system. The computational effort is much larger for the time-domain method than for the analytical methods. In the study, all methods were used to determine the damping characteristics of a four-machine power system in different configurations. The study shows that fast analytical methods may provide results which closely agree with the detailed method of time-domain simulation. However, the study also shows that the level of accuracy in the analytical model is very important.

Place, publisher, year, edition, pages
2011. Vol. 26, no 1, 356-363 p.
Keyword [en]
Frequency scanning, subsynchronous oscillations, subsynchronous resonance (SSR), torsional interaction
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-31345DOI: 10.1109/TPWRS.2010.2046345ISI: 000286516100039Scopus ID: 2-s2.0-79151473380OAI: oai:DiVA.org:kth-31345DiVA: diva2:404472
Note
QC 20110317Available from: 2011-03-17 Created: 2011-03-14 Last updated: 2017-12-11Bibliographically 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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