Coordinated tuning of synchronous generator controllers for power oscillation damping
The increasing share of renewable generation will lead to time-varying oscillatory modes in large scale power systems. Today, oscillatory modes are defined by the location of conventional power plants and by the current load level in the grid. In the future, more conventional power plants will be periodically disconnected depending on the share and location of renewable generation. Hence, the oscillatory modes will become more time variable than today, e.g. depending on the weather. Thus, new functions become necessary in order to optimally use existing controllers, e.g. power system stabilizers, for damping of inter-area oscillations. In this paper, we present a method for parameter tuning of generator controllers for optimal oscillation damping based on structured H-infinity optimization. We assume that power system stabilizers are not appropriately parametrized and use the proposed method to find the optimal parametrization of the controllers. The efficiency of the proposed method is shown with detailed rounded-mean-square simulations of a well known four generator and the IEEE 39 bus power system.