P.K. Dash and M.H. Naeem
This article presents the design of a new fuzzy variable structure controller for the unified power flow controller (UPFC) in a multi- machine power system. This new design provides overall variable proportional and integral gain in damping both inter-area and local modes of oscillations of the synchronous generators in multimachine power systems. The conventional PI controllers that are used to adjust the series converter voltage and phase angle of the UPFC show inferior performance compared to the proposed controller for a variety of transient disturbances covering faults and power changes. The conventional integral control along with a variable structure fuzzy proportional control scheme based on a sliding surface and its derivative provides a superb steady-state performance as well as dynamic performance that damps the system oscillations rapidly. The sliding surface also provides robustness against any uncertainty in the system parameters and disturbance modes.
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