Analysis of Subsynchronous Resonance in Power Systems

Voltage Control and Power Oscillation Damping Of Multi-Area Power System Using StaticSynchronous Series Compensator

“…The system must be able to operate satisfactorily under these conditions and successfully meet the load demand. It must also be able to survive numerous disturbances of a severe nature, such as short-circuit on a transmission line or loss of a large generator.Oscillations of generator angle or line angle are generally associated with transmission system disturbances and can occur due to step changes in load, sudden change of generator output, transmission line switching, and short circuits [10][11]. Depending on the characteristics of the power system, the oscillations may last for 3-20 seconds after a severe fault.…”

A Hybrid Fuzzy/LQR Based Oscillation Damping Controller Using 3-level STATCOM

“…Ali Ajami is with the electrical engineering department of Azarbaijan university of Tarbiat Moallem, Tabriz, Iran, phone: +98-914-3183362; fax: +98-412-4327548; e-mail: ajami@azaruniv.edu Naser Taheri is with the electrical engineering department of, Islamic Azad University, Quchan Branch, Iran, e-mail: N.Taheri.1362@gmail.com sustained. This interplay between electrical and mechanical systems is termed as torsional oscillations [2].…”

“…Ali Ajami is with the electrical engineering department of Azarbaijan university of Tarbiat Moallem, Tabriz, Iran, phone: +98-914-3183362; fax: +98-412-4327548; e-mail: ajami@azaruniv.edu Naser Taheri is with the electrical engineering department of, Islamic Azad University, Quchan Branch, Iran, e-mail: N.Taheri.1362@gmail.com sustained. This interplay between electrical and mechanical systems is termed as torsional oscillations [2].Flexible AC Transmission Systems (FACTS) technology is an important tool for permitting existing transmission facilities to be loaded, at least under contingency situations, up to their thermal limits without degrading system security [3][4][5][6]. The most striking feature is the ability to directly control transmission line flows by structurally changing parameters of the grid and to implement high-gain type controllers, based on fast switching.…”

Modifying eigenvalue interactions near weak resonance

“…are the roots of the quadratic polynomial in t of (8). To obtain µ a , we drop the high-order term o(|(t, , p)| 2 ) and replace q 1 and q 2 by r 1 and r 2 .…”

“…Since the modes determine the power system stability and small signal transient performance, understanding the behavior of the complex modes is fundamental to avoiding power system oscillations [9,2,8]. Indeed, a better understanding and suppression of low frequency interarea oscillations or subsynchronous resonance could relax some of the constraints on larger bulk power transfers and increase power system security.…”