III-type PSS (Power System Stabilizer) parameter setting method

The invention discloses an III-type PSS (Power System Stabilizer) parameter setting method, which comprises the following steps of 1, setting a state variable according to a correction link in an III-type PSS model structure, and setting a state equation according to the selected state variable; 2, carrying out mathematical manipulation on the state equation, and converting to a transfer function of a multi-term expression; 3, formulating a corresponding computational formula of an III-type PSS parameter by utilizing an Excel spreadsheet; 4, changing a PSS phase shift by utilizing the corresponding computational formula of the III-type PSS parameter through adjusting an input parameter so as to cause an AVR (Automatic Voltage Regulator)+PSS total phase shift to reach a range specified by the national standard after compensation, wherein the obtained parameter is a parameter obtained after setting, and completing the whole III-type PSS parameter setting work. According to the invention, the relative PSS phase shift compensation parameter is quickly and accurately figured out so as to be convenient for a worker to carry out PSS parameter setting.