Based on parameters of generator and equivalent system

a single-infinity system model is established by using power system analysis software package（ PSASP）. After the acquisition of phase frequency characteristics of excitation system without compensation

the parameters of phase link are set by fitting the compensation curve. The simulation results show that the power system stabilzer（ PSS） after setting has significant effect on restrain low frequent oscillation. Cornparison of simulation and experimental results show that

within the scope of the engineering allowable error

the measured phase frequency character of excitation system without compensation could be replaced by the corresponding simulation values.