Abstract
AbstractIn normal operation of the nuclear power plant, the speed and load control mode of the turbine governing system are adopted before and after the unit connected to the grid. The load fluctuation reason of the turbine generator after connected to the grid is studied and the speed deviation is considered as the main reason. To solve the above problem of the speed deviation, the principle schemes of the speed and load control are researched. The optimization of grid connection scheme and the optimization of the load closed loop control are proposed, modifying the speed set-point value of grid connection and designing automatic load closed loop control method. Finally the speed deviation during grid connection is eliminated and the load fluctuation is reduced after grid connection. The proposed scheme can ensure the safety and reliable operation of the steam turbine unit after synchronizing to the grid. Thus the safety and reliable operation of entire nuclear power plant is guaranteed technically.KeywordsLoad fluctuationSpeed deviationLoad closed loop control
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