Fuzzy logic switching control for electrical double-layer energy capacitor system for stability enhancement

A fuzzy logic based switching control system has been proposed for an electrical double-layer energy capacitor system (ECS) to enhance the overall stability of electric power systems. The real power flow signal at the location of the ECS is utilized to generate switching control signals for the regulation of charging or discharging power to and from the ECS. Through the proposed control, the damping of poorly damped oscillations can be highly improved. To demonstrate the efficiency of the proposed switching control, nonlinear simulations have been performed for a one-machine infinite-bus system and also experimental evaluations have been performed on the analog power system simulator at the Research Laboratory of Kyushu Electric Power Co. Fundamental testing for an actual ECS with the capacity of 250 kJ are now ongoing to demonstrate the feasibility of the proposed switching control.