Study On The Optimal Algorithm Of Parameters Of Power System Stabilizer

China nationwide power system is at its early stage. Due to weak connections between regional power systems, the damping of the whole system is weak, thus low frequency oscillations are easy to be detected. And this is a threat to the safety operating of the whole system. Currently, power system stabilizers (PSS) are widely used to suppress the low frequency oscillations. PSS is an attached equipment of excitation system, and it uses some signals which have something with oscillation to create some additional signals, and make the generator create an additional damping torque. This torque can add damping of mechanical mode of power system and supress low frequency oscillation, and improve small signal stability. Coordination design of PSS in multi machine power systems is a challenging task. It is very important to the stability of power system. Researchers all over the world show their interests on this point, and their research focus on using optimal algorithms to optimize parameters of PSS.