Energy function based Fuzzy Logic Discrete control with SSSC for stability improvement

Static Synchronous Series Compensator is a flexible AC transmission System device which can improve the stability of the system, increases the power transfer capability and is useful for the fast control of power flow. This paper analyzes the use of SSSC with discrete control to improve the transient stability of power system. During transient period SSSC is switched between inductive or capacitive or operating value and whose reference value of reactive voltage is obtained from Fuzzy Logic Discrete Controller (FLDC). The fuzzy logic discrete controller is based on energy function. Transient simulation is carried out to analyze the system. The results of the case study system adapted from IEEE First Benchmark Model demonstrate the effectiveness of fuzzy logic discrete controller in stabilizing the rotor angle oscillation. Linear analysis is performed on D-Q model of the system with FLDC and SSSC.