Title :
A fuzzy controller for generator excitation control
Author :
Hsu, Ying-Yu ; Cheng, Chong-hu
Author_Institution :
Dept. of Electr. Eng., Nat. Taiwan Univ., Taipei
Abstract :
An approach based on fuzzy set theory is proposed for the design of an excitation controller for a synchronous generator. In the proposed fuzzy expert system, generator speed deviation and acceleration are taken as controller inputs. These input signals are first characterized by linguistic variables using fuzzy set notations. A fuzzy relation matrix is built to give the relationship between controller input and controller output. A set of fuzzy logic operations are performed by the fuzzy excitation controller using controller inputs and fuzzy relation matrix to get the desired controller output. To demonstrate the effectiveness of the fuzzy excitation controller, digital simulations of a power system subject to a three-phase fault under different operating conditions are performed. It is found that the fuzzy excitation controller can improve the dynamic performance of a power system over a wide range of operating conditions. Since the fuzzy excitation controller does not require model identification, it can be easily implemented on a microcomputer
Keywords :
computerised control; expert systems; fuzzy control; machine control; synchronous generators; acceleration; fuzzy controller; fuzzy expert system; fuzzy logic operations; fuzzy relation matrix; fuzzy set theory; generator excitation control; linguistic variables; microcomputer; speed deviation; synchronous generator; three-phase fault; Control systems; Fuzzy control; Fuzzy logic; Fuzzy set theory; Fuzzy sets; Fuzzy systems; Power system dynamics; Power system faults; Power system modeling; Power system simulation;
Journal_Title :
Systems, Man and Cybernetics, IEEE Transactions on