The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 06, 2003
Filed:
Dec. 15, 2000
Lennart Angquist, Enkoping, SE;
ABB AB, Vasteras, SE;
Abstract
In a method for damping power oscillations in a transmission line, at least one first angular-frequency signal is generated, representing a first angular frequency which is given by a prior knowledge of oscillation frequencies expected in the power system, and a first phase-reference signal is formed as the time integral of the angular-frequency signal. A power quantity in the transmission line characterizing the power is sensed and a first estimated power quantity is formed, representing for an oscillation of the first angular frequency, its amplitude and phase position relative to the first phase-reference signal. A first damping signal is formed with an amplitude dependent on the amplitude of the first estimated power quantity and with a first phase shift in relation to the phase position thereof, and the first damping signal is supplied to an actuator for influencing the power transmitted in the transmission line.