Application of fuzzy logic control in power system stabilisation

The stabilisation of a power system has proved a challenging and difficult task. The nonlinearity of these systems has been the main source of the problem. The complex nonlinearised mathematical models of power systems should be linearly approximated before modern control theories can be applied to them. The linearised models are acceptable as long as the external disturbance to the system is small. In practice, however, the large variation in the external disturbances produces large errors which cannot be ignored. In this paper, fuzzy logic control (FLC) is applied to this problem. In order to illustrate the complexity of the modelling of the stabiliser, conventional methods used for defining its behaviour are described. The FLC designed for this problem is presented, and its performance, as compared to the conventional controller, is reported.