Use of SSSC to improve first swing stability limit and damping of a power system

Abstract This paper proposes a new control strategy of a static synchronous series compensator (SSSC) to improve the first swing stability limit and damping of a power system. The first swing stability limit is improved by initially operating the SSSC at its full capacitive rating until the machine speed reaches a reasonable negative value during the first return journey. This is required to maximize the decelerating area and fully utilizing it in counterbalancing the accelerating area. Afterwards, a linear control is applied to improve damping in subsequent swings. The performance of the proposed control is then investigated on a single machine infinite bus system and the 10-machine New England system. Simulation results indicated that the proposed control can significantly improve the first swing stability limit as well as damping of both the systems.

[1]  U. Gabrijel,et al.  Direct Methods for Transient Stability Assessment in Power Systems Comprising Controilable Series Devices , 2002, IEEE Power Engineering Review.

[2]  M.H. Haque,et al.  Improvement of first swing stability limit by utilizing full benefit of shunt FACTS devices , 2004, IEEE Transactions on Power Systems.

[3]  L. Xu,et al.  Advanced SVC control for damping power system oscillations , 1991 .

[4]  Vijay Vittal,et al.  Critical Energy for Direct Transient Stability Assessment of a Multimachine Power System , 1984, IEEE Transactions on Power Apparatus and Systems.

[5]  L. Angquist,et al.  Power oscillation damping using controlled reactive power compensation-a comparison between series and shunt approaches , 1993 .

[6]  Mehrdad Ghandhari,et al.  Improving power system dynamics by series-connected FACTS devices , 1997 .

[7]  A. Michel,et al.  Power system transient stability using individual machine energy functions , 1983 .

[8]  M. Ghandhari,et al.  A Robust Control Strategy for Shunt and Series Reactive Compensators to Dame Electromechanical Oscillations , 2001, IEEE Power Engineering Review.

[9]  P. Kumkratug,et al.  Improvement of stability region and damping of a power system by using SSSC , 2003, 2003 IEEE Power Engineering Society General Meeting (IEEE Cat. No.03CH37491).

[10]  Laszlo Gyugyi,et al.  Dynamic compensation of AC transmission lines by solid-state synchronous voltage sources , 1994 .

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