Fuzzy logic control of a SVC to improve the transient stability of ac power systems

In this work, an efficient fuzzy logic controller is used to improve the controllability of a SVC (static var compensator). The SVC device is a member of the FACTS (flexible alternating current transmission system) family employed in power transmission systems. The new fuzzy logic controller replaces the existing PI regulator and permits better disturbance compensation and voltage regulation. The SVC is used to maintain the voltage bus constant by absorbing or injecting reactive power. The proposed fuzzy controller uses the error between the reference voltage and the measured voltage to determine the required susceptance B. The fuzzy controller has been implemented in MATLAB/SIMULINK and the effectiveness of the reactive power compensation and the voltage regulation are demonstrated by simulations.

[1]  A. Prudenzi,et al.  A Model of Large Load Areas for Harmonic Studies in Distribution Networks , 1997, IEEE Power Engineering Review.

[2]  M. A. Abido,et al.  Coordinated design of a PSS and an SVC-based controller to enhance power system stability , 2003 .

[3]  Yuanyuan Sun,et al.  A New Method to Model the Harmonic Generation Characteristics of the Thyristor Controlled Reactors , 2007, 2007 IEEE Lausanne Power Tech.

[4]  Seung-Il Moon,et al.  Installation and operation of FACTS devices for enhancing steady-state security , 2004 .

[5]  Xia Jiang,et al.  OPERATING MODES AND THEIR REGULATIONS OF VOLTAGE-SOURCED CONVERTER BASED FACTS CONTROLLERS , 2007 .

[6]  C.D. Yang,et al.  Benefit-Based Optimal Allocation of FACTS: SVC Device for Improvement of Transmission Network Loadability , 2007, 2007 International Conference on Intelligent Systems Applications to Power Systems.

[7]  Mohammed H. Haque.  Damping improvement by FACTS devices: A comparison between STATCOM and SSSC , 2006 .

[8]  J. Dixon,et al.  Reactive Power Compensation Technologies: State-of-the-Art Review , 2005, Proceedings of the IEEE.

[9]  S. Lefebvre,et al.  Detailed modeling of static VAr compensators using the electromagnetic transients program (EMTP) , 1991, Proceedings of the 1991 IEEE Power Engineering Society Transmission and Distribution Conference.

[10]  Claudio A. Canizares,et al.  Analysis of SVC and TCSC controllers in voltage collapse , 1999 .

[11]  L. Gyugyi,et al.  The unified power flow controller: a new approach to power transmission control , 1995 .

[12]  Laszlo Gyugyi,et al.  Understanding FACTS: Concepts and Technology of Flexible AC Transmission Systems , 1999 .

[13]  Steve Starrett,et al.  Fuzzy logic control schemes for static VAR compensator to control system damping using global signal , 2003 .