Experimental evaluation of three-dimensional single-loop fuzzy logic excitation controller

This paper presents a three-dimensional single-loop fuzzy logic based excitation control system to enhance the overall stability of electric power systems. The proposed controller consists of a single control loop for both the voltage and the damping control. The inputs to the controller are the terminal voltage signal and the real power output signal, and the output is the excitation control signal which is fed back to the thyristor excitation system. The proposed controller is set up by using a personal computer with a DSP board with AD and DA conversion interfaces. The control program has been developed in the Matlab/Simulink environment, and the program is executed on the DSP board in real time. To demonstrate the efficiency of the proposed excitation controller, experimental studies have been performed on the Analog Power System Simulator at the Research Laboratory of Kyushu Electric Power Co.