Direct methods for transient stability assessment in power systems comprising controllable series devices

In this paper, new energy functions that incorporate the action of controllable series devices (CSDs) are presented. They make it possible for the direct method to acquire the critical clearing time (CCT) of a single machine-infinite bus (SMIB) power system and the certain series flexible AC transmi...

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Bibliographic Details
Published in:IEEE transactions on power systems 2002-11, Vol.17 (4), p.1116-1122
Main Authors: Gabrijel, U., Mihalic, R.
Format: Article
Language:English
Subjects:
Buses (vehicles)
Control systems
Damping
Devices
Digital simulation
FACTS
Flexible AC transmission systems
Laws
Mathematical analysis
Mathematical models
Optimal control
Power system control
Power system modeling
Power system stability
Power system transients
Series compensators
Stability
Studies
Voltage control
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Summary:In this paper, new energy functions that incorporate the action of controllable series devices (CSDs) are presented. They make it possible for the direct method to acquire the critical clearing time (CCT) of a single machine-infinite bus (SMIB) power system and the certain series flexible AC transmission systems (FACTS) devices directly. Dealing with this matter, optimal control strategies for the controllable series compensation (CSC) and the static synchronous series compensator (SSSC) are first derived. These and later tasks make use of the advantages of mathematical models which represent the controllable parameter of a FACTS device in relation to the transmitted real power through the given line. Using the derived control laws and some assumptions, Lyapunov-like energy functions were carried out. The results of a numerical example attained by a direct method and a digital simulation are shown to be promising. The final consideration suggests where future efforts should be directed.
ISSN:0885-8950
1558-0679
DOI:10.1109/TPWRS.2002.805015