Stabilization of multimachine power systems by PDC and optimal fuzzy controls

The power system models for transient stability studies are nonlinear and complex. In this way, the contribution of this paper is to present design methodologies for stabilization of the transient faulted power system. So, the nonlinear model is represented by a Takagi-Sugeno fuzzy model. Two fuzzy controls which are the fuzzy PDC (Parallel Distributed Compensation) control and the fuzzy optimal control are proposed and compared. For illustration purposes, these techniques are applied successfully to 4-machine system. A 3-phase to ground fault is considered on line between two buses.