A Modal Stabilizer for the Independent Damping Control of Aggregate Generator and Intraplant Modes in Multigenerator Power Plants

A modal 2-channel power system stabilizer structure is proposed for multigenerator power plants having units with similar parameters and loading. One channel is designed to damp only the aggregate generator electromechanical mode while the other is designed to damp only the intraplant modes. Simplified analytical models helped to mathematically demonstrate that the dynamics of the two channels of the proposed stabilizer are decoupled by the feedback of specific linear combinations of rotor speeds to each one of the channels. Linear and nonlinear simulation results for a detailed model of a multigenerator plant show the potential gains in using the proposed 2-channel PSS to solve challenging oscillation damping control problems.