Fuzzy logic control scheme with variable gain for static VAr compensator to enhance power system stability

• Published in: IEEE transactions on power systems Vol. 14; no. 1; pp. 186 - 191
• Main Authors: Hiyama, T., Hubbi, W., Ortmeyer, T.H.
• Format: Journal Article
• Language: English
• Published: New York, NY IEEE 01-02-1999; Institute of Electrical and Electronics Engineers
• Subjects: Applied sciences; Automata. Logic controller; Compensators; Computer science; control theory; systems; Connection and protection apparatus; Control systems; Control theory. Systems; Disturbances. Regulation. Protection; Electrical engineering. Electrical power engineering; Electrical power engineering; Exact sciences and technology; Fuzzy control; Fuzzy logic; Gain; Load flow; Microcomputers; On-line systems; Operation. Load control. Reliability; Power networks and lines; Power system simulation; Power system stability; Reactive power; Static VAr compensators; Steady-state; Systems stability; VAR; Variable gain; Digital control; Fuzzy logic; Fuzzy control; Static reactive compensator; Simulation; Flexible transmission; Circuit stability; Real time processing; Switching system; Alternating current; On line device
• ISSN: 0885-8950; 1558-0679
• DOI: 10.1109/59.744518

This paper presents a fuzzy logic (FL) control scheme with variable gain for static VAr compensators (SVC) to enhance power system stability. The proposed control scheme is simple and has low computational requirements, therefore, it is suitable for online implementation using a microcomputer. To control the SVC, only the real power flow signal is utilized at the location of the SVC. Variable gain is proposed to terminate the switching control of the SVC soon after reaching quasi steady-state to avoid excessive and unnecessary control action from the SVC. Coordination with power system stabilizers (PSS) is also considered for further enhancement of stability. The performed simulation studies demonstrate the effectiveness of the proposed control scheme.