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In this paper, the model of turbine governor based on the physical principles is constituted to improve the accuracy of
power system dynamic simulation, making the results of simulation consistent
with the actual situation. The unit and grid coupling model
which reflects the interaction between thermal system of
power plant and power system is built using EMTDC/PSCAD. The influence of nonlinear
characteristics on the valve opening and the steam turbine mechanical power is
also analyzed in this paper. The results of simulation show that the improper
setting of parameters reflecting nonlinear characteristics of turbine governor
can lead to the cyclical oscillations of the valve
opening and the steam turbine mechanical power, and
even can lead to the power oscillation persistently.
The research achievements in this paper have a certain reference value on
exploring the causes of power oscillation from the prime mover.