Systematic tuning of nonlinear power system controllers

Nonsmooth nonlinearities have a significant influence within many power system controllers, and hence affect overall system dynamic behaviour. This paper focusses on the output limiters of power system stabilizers (PSSs). Even though these limits play an important role in the response of generators to large disturbances, only ad hoc tuning procedures have been available. Therefore a systematic, optimization-based approach is proposed in this paper. Dynamic behaviour is improved by minimizing the deviation of generator angles and terminal voltages from their post-disturbance values. The algorithm builds on techniques for efficiently computing trajectory sensitivities for hybrid systems.