Transient stability assessment of systems comprising phase-shifting FACTS devices by direct methods

In this paper the concept of a control Lyapunov function is used to develop control strategies for thyristor-controlled phase-shifting transformers (TCPSTs). Two typical representatives of TCPSTs were chosen for consideration: a Quadrature Boosting Transformer (QBT) and a Phase Angle Regulator (PAR)...

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Bibliographic Details
Published in:International journal of electrical power & energy systems 2004-07, Vol.26 (6), p.445-453
Main Authors: Mihalič, Rafael, Gabrijel, Uros
Format: Article
Language:English
Subjects:
Applied sciences
Control strategy
Direct method
Electrical engineering. Electrical power engineering
Energy function
Exact sciences and technology
Power electronics, power supplies
Testing. Reliability. Quality control
Thyristor-controlled phase-shifting transformer
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Summary:In this paper the concept of a control Lyapunov function is used to develop control strategies for thyristor-controlled phase-shifting transformers (TCPSTs). Two typical representatives of TCPSTs were chosen for consideration: a Quadrature Boosting Transformer (QBT) and a Phase Angle Regulator (PAR). For the case of the QBT we showed that the proposed control law can significantly improve the large signal stability in comparison to the control-law-based on the traditionally used injection model proposed in various references. Even if the system parameters are estimated very roughly, our proposed strategy gives better results than the ‘traditional’ strategy. Also, some novel energy functions, which consider the action of an optimally controlled TCPST in a single-machine infinite-bus (SMIB) system, are presented and validated by a numerical example.
ISSN:0142-0615
1879-3517
DOI:10.1016/j.ijepes.2003.12.001