Point beach nuclear plant application study for power system stabilizers

Dynamic stability problems have been experienced with a generator connected to an infinite bus through a long transmission line, Nuclear turbine-generator units 1 and 2 at the Wisconsin Electric Power Point Beach Station were found to be dynamically unstable when one unit is isolated on one of the lines to Milwaukee or when two units are isolated on the two lines to Milwaukee Power System Stabilizers(PSS) were applied to the excitation system to provide stable operation under these conditions. Suitable settings for the PSS were predetermined analytically by computer method and root locus analysis of an equivalent single machine-infinite bus configuration. This procedure allows graphical approach to the design of power stabilizers and serves as assynthesis procedure when the design constraints are relaxed so that the speed stabilizer is required to provide animprovement in system damping. A simplified model of the complete exciter-generator system is shown to be adequate for this type of analysis. (Author)