Intelligent static synchronous compensator with super-capacitor for enhancement of power network security

Power network security becomes an important issue for power system economics. A proportional integral-based static synchronous compensator in flexible AC transmission systems is generally used to enhance power network security. But, it takes more time to make the network stable and secure. A PI-controlled STATCOM with a super-capacitor as an electrical storage device and transient performance improver helps the network become stable and secure. As the PI controller depends on mathematical modeling, it may respond slowly, affecting the stability and security of the network. A fuzzy logic controller, as an intelligent controller with logical rules, can overcome the slow response problem of PI controllers. Hence, to enhance power network security, an intelligent static synchronous compensator in coordination with a super-capacitor is suggested here. A multimachine network is modeled in a MATLAB environment with severe faults near the generator, making it unstable and unsecure. The validation of the proposed combination is observed by comparing the performance of the network without STACOM, with conventional PI STATCOM, with intelligent STATCOM, and with intelligent STATCOM coordinated with a super-capacitor.