Research on Pressure and Water Level Control of the Pressurizer for Marine Nuclear Power Plant Based on Multivariable MPC

Good control of the pressure and water level of the pressurizer is a key prerequisite for the safe and economic operation of the pressurized water reactor (PWR) nuclear power systems. In this paper, the dynamic characteristics of pressure and water level of the pressurizer are analyzed based on marine PWR simulator firstly. It is found that its pressure and water level have obvious coupling characteristics. Then the least square method is used to identify the transfer function model of pressure and water level. A comparative analysis with the simulator data shows that the transfer model has a high degree of coincidence. Finally, a multivariable control method of pressure and water level based on MPC is proposed. The simulation results show that the method can achieve stable tracking of the target value accurately under the simultaneous change of pressure and water level setting.