Sliding mode control of a static VAR controller for synchronous generator stabilization

Abstract

The paper deals with the design and evaluation of a variable-structure stabilizer for static VAR compensators using a sliding mode control technique. The static VAR system plays an important role as a stability aid for small and large signal transient disturbances in an interconnected power system. A systematic procedure for selection of switching hyper planes in the design of variable-structure controllers is developed by using a geometric approach known as projector theory. The sliding mode control of static VAR controllers improves the transient response of the power system and provides significant damping to the electromechanical oscillations of the synchronous generator. Computer simulation results for a typical power system shows the effectiveness of a VSS static VAR stabilizer.