中文摘要：

蒸汽发生器为压水堆核电站中重要的动力设备和传热装置，其水位控制在系统运行过程中尤为重要。但由于被控对象的不确定性和非线性，如果采用精确的数学模型来设计控制器，往往难以得到满意的控制效果，甚至会造成无法控制。为了实现对蒸汽发生器水位的控制，本文针对被控对象的特点，采用多模型内模控制方法，并结合粒子群算法利用控制性能指标离线优化加权系数，仿真结果显示此方法可使控制效果进一步加强，对蒸汽发生器水位达到很好的控制效果。

英文摘要：

Steam generator （SG）is an important heat transfer device in nuclear power plant, its water level control system is particularly important during unit operation. However, due to the uncertainty and nonlinearity characteristics of SG,its characteristics are different under different unit load. If a precise mathematical model is used to design the controller, it is usually difficult to obtain satisfactory control performance changed , even it may cause uncontrollable. As for these characteristics of SG system tiele adopts multi-model internal model control method, and weight coefficients are algorithm. Simulation results show that this method can further enhance the control if the unit operating conditions in nuclear power plant, this aroptimized offline by using PSO effect.