E3-2 - Sedma Nacionalna Konferencija so Me|unarodno U~estvo...

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BACK-STEPPING SYNTHESIS OF NONLINEAR ADAPTIVE CONTROL FOR THYRISTOR-CONTROLLED SERIES COMPENSATION Wenlei Li 1 , Jovan D. Stefanovski2, Yuanwei Jing 1 , and Georgi M. Dimirovski 3,4 1 Northeastern University, Institute of Control Science – Faculty of Information Science & Engineering – Shenyang, Liaoning, 110004, P. R. of China – E-mail: [email protected] 2 JP “Strezhevo” Co, Control & Informatics Division – “1 Maj” bb, MK-6000 Bitola, Macedonia – E-mail: [email protected] 3 Dogus University, Department of Computer Engineering – Faculty of Engineering, Acibadem, Zemaet Sk. 21, Kadikoy – TR-34722 Istanbul, R.ep. of Turkey – E-mail: [email protected] 4 SS Cyril & Methodius University, Automation & Systems Eng – Faculty of Electrical Eng., MK- 1000 Skopje, Rep. of Macedonia Abstract – TCSC device in its operating role within electrical power systems is studies in this paper form the control point of view. The inherently nonlinear second-order model of single machine to infinite bus system with TCSC has been adopted and a nonlinear adaptive robust controller is designed using back-stepping control design methodology. Under the condition of damping coefficient being measured inaccurately, a dynamic feedback controller can be designed using adaptive back-stepping also encompasses the real-time estimation of uncertainty parameter. Currently the back-stepping design methodology of math-analytical nonlinear control theory attracts considerable focus in applied control designs for various engineering systems. For, with back-stepping methodology the original non-linear system model needs not linearization, and yet the closed–loop error system is guaranteed to be asymptotically stable. Keywords – Back-stepping method; Lyapunov stability; nonlinear control; power electronics; power systems; TCSC device 1. INTRODUCTION Thyristor controlled series compensator (TCSC) is a typical one of the novel family of devices with a common name Flexible AC Transmission Systems (FACTS) (see CIGRE and IEEE-PAS, 1995; Hingorani and Gygi, 2000). FACTS devices have been developed with adopted for the purpose of increasing the operational flexibility of electric power systems through improved controllability (Anderson and Fuad, 1994; Dimirovski and Tomsic, 1989, Fuad, 1988). When installed in the long transmission line centre, a TCSC can provide voltage support, reduce the equivalent electric distances, and enhance the transient stability of power systems under large and/or small disturbances (Ilic and Zaborski, 2000). At the same time, TCSC owns some additional merits, such as enabling system controlling action rapidly and continuously as well as being easily maintained and reliable. Investigations on TCSC devices, their role in electrical power systems and their impact on power system operation have attracted considerable attention by researchers of different expertise.
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This note was uploaded on 02/18/2010 for the course ITK ETF113L07 taught by Professor Popovskiborislav during the Spring '10 term at Pacific.

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E3-2 - Sedma Nacionalna Konferencija so Me|unarodno U~estvo...

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