Rafael Mihali , and Uros Gabrijel
Faculty of Electrical Engineering, University of Ljubljana, Trzaska 25, Ljubljana 1000, Slovenia
Available online 23 January 2004.
Abstract
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.
Author Keywords: Author Keywords: Thyristor-controlled phase-shifting transformer; Control strategy; Energy function; Direct method
最后修改：2005-3-15 17:09:23