TS-fuzzy controller for UPFC in a multimachine power system

The unified power flow controller is one of the most versatile flexible AC transmission system devices, which can be used to control the active and re active power flows in a transmission line by injecting a variable voltage i n series and reactive current in shunt. The application of Takagi-Sugeno ty pe fuzzy logic controllers for UPFC voltage source inverter control in a mu lti-machine power system environment is proposed. This type of fuzzy contro ller provides a wide range of control gain variation by including both line ar and non-linear terms in the consequent part of the fuzzy rule base. The TS fuzzy controllers are quite general in that they use arbitrary input fuz zy sets, any type of fuzzy logic, and the general defuzzifier. Several comp uter simulation tests on a multi-machine power system indicate the signific ant damping performance of this new TS fuzzy controller for the UPFC.