Influence of Excitation and Speed Control Parameters in Stabilizing Intersystem Oscillations

Intersystem power oscillations have occurred between the interconnected utility systems of Saskatchewan, Manitoba, and Ontario (West System). Such power swings have been most evident when the power transmission angles on the interconnections or on certain internal 138-kV and 115-kV transmission have been of relatively great magnitude. The oscillations have been controlled or reduced by adjustment of the excitation of speed control parameters on various groups of machines throughout the three inter- connected systems. The analytical techniques utilized to determine the adjustments will be of considerable benefit in planning future exrtensions to the interconnections and facilities within the power systems in the three provinces.