Abstract：Refering to the design idea of the Power System Stabilizer, a leading phase compensation method of guide vane is proposed in this paper, to restrain the water pressure oscillation. First, transfer function models of the hydraulic dynamic of pipe, hydraulic turbine and governor are introduced. According to the transfer function model, the lag phase angle from output control signal of governor to water pressure oscillation at the inlet of hydraulic turbine can be calculated. Then, water pressure oscillation signal is used as the input signal of phase compensation link, while the output of phase compensation link and the output of governor PID are integrated to form a new control signal. Parameters design of phase compensation link is analyzed. At last, a simulation testing system is established to carry out simulation research. Results show that the compensation adjusting way proposed in this paper can modulate the phase of guide vane oscillation to have a certain leading phase angle. Although its leading phase angle cannot reach its expected design value, the stability of hydraulic turbine generating sets is improved obviously. Tendency of active power regulation in transient is invariable, and regulation speed is faster. So the proposed method for restraining water pressure oscillation of the pipe to improve transient stability of hydraulic turbine generating sets is effective.
