Abstract
Compared to a conventional thermal power unit, a Pressurized Water Reactor (PWR) nuclear power unit is more prone to overspeed for its lower steam parameters. Disturbance from the grid may cause a significant rise of the rotor speed and even damage the nuclear reactor. Therefore, the installation of Overspeed Protection Control (OPC) is necessary, which functions by shutting the valve fast and decreasing the amount of the steam to limit the speed rise. Further researches on nuclear power units with OPC are important to the protection of nuclear power units. Practically, different OPC strategies can be obtained by switching the trigger signals or by controlling the valves selectively. Based on User Defined Model (UDM) in Power System Analysis Software Package (PSASP), a PWR nuclear power unit model with OPC is established. Different OPC strategies are analyzed when a fault occurs in the main grid. The simulation result verifies the protective effect of OPC, and it performs more effectively when the high/medium pressure valves and the trigger signals of power deviation and frequency deviation work complimentarily in a certain order.
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