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In order to analyze the impact mechanism of the valve flow characteristic on power oscillation, flow characteristics deviation of the steam turbine control valve is firstly analyzed and a coefficient for the deviation assessment is proposed; then, the model of generating unit coupled with dynamic system and electrical system is established according to the characteristics of deviation coefficient, with which the valve flow characteristics deviation is considered. Effect of flow deviation on power oscillation is analyzed by time-domain simulation. The simulation results show that the poor partial flow characteristics of the turbine valves are likely to cause power fluctuations and both the amplitude and the speed of oscillations are positively related to the extent of flow characteristics deviation. The conclusion can provide reference to research on the causes of power oscillations.
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