期刊名称：International Journal of Electrical, Electronics and Computer Engineering
电子版ISSN：2277-2626
出版年度：2012
期号：657
页码：7
出版社：RESEARCH TREND
摘要：ABSTRACT : Power system stability has received a great deal of attention over the year. Stability is now a major concern in planning and operating electric power System. A large interconnected power system is exposed to many disturbances, which make the system unstable and thus are a threat to its security. In recent days, the effects of these disturbances are more serious considering the intensive use available electric power and its wide transmission. These disturbances result in electromechanical oscillations being set up in the interconnected system. The capability of the system to achieve an operating equilibrium after disturbances are caused in it depends on its inherent strength and on the nature and intensity of the disturbance .Increasing attention has been focused on the eff.ect of excitation control on the damping of oscillations, which characterize the phenomena of stability. In particular it has been found useful and practical to incorporate transient stabilizing signal derived from speed, terminal frequency or accelerating power superimposed on the normal voltage error signal to provide for additional damping of this oscillation. Such device is known as Power System Stabilizer (PSS). The PSS extend the system stability limits by modulating generator excitation to provide damping to the oscillation of synchronous machine rotors relative to one another. The PSS produces a component of torque, which is in phase with the rotor speed deviations, in order to enhance system damping. Damping due to low frequency oscillation problems are very difficult to solve because power system are very large, complex. Therefore it is very necessary to utilize efficient techniques for implementation. From this perspective many successful methods and algorithms have been developed .This paper presents a survey of literature on the various methods, algorithms and optimization methods applied to solve the PSS problems. The purpose of this paper is to present an overview of the PSS, based on different techniques and optimization methods on published literature from 1994 to the present.
