1998 Volume 118 Issue 1 Pages 6-14
Since Adjustable-Speed Generator (ASG) is excited by alternative voltage fed by a quick-response cycloconverter, the rotor speed can be changed continuously. The ASGs installed at some pumping-up power stations are now utilized for Automatic Frequency Control at night time and under the light load condition by changing the pumping-up power due to the rotating speed change. It is expected. on the other hand. that under the generating condition at day time ASG will be utilized for improvement of power system stability because it can change the active power and the reactive power independently of each other. This paper presents the effect of the excitation control system of ASG designed by robust pole allocation method which is one of the controller design techniques besed on H∞control theory, on the power system damping enhancement. Eigenvalue analysis and digital time simulation arc carried out for 10-machine longitudinal test power system including ASGs in order to evaluate the designed controller.