核电站蒸汽发生器水位的模糊GPC控制系统研究

蒸汽发生器水位直接影响到整个核电站的安全及稳定运行,但蒸汽发生器本身由于所具有的高度复杂性、非线性、时变性等特性,导致传统的串级PID控制等多种方法难以取得好的控制效果.在串级控制的基础上,采用模糊广义预测控制来对蒸汽发生器水位进行控制,此法能充分发挥模糊控制及预测控制的优点,首先利用T-S模糊模型对系统进行辨识,并将其转化为线性时变状态空间模型,然后基于线性化的模型设计出广义预测控制器,并对蒸汽发生器水位进行自适应控制.仿真结果表明,与传统的串级PID控制相比,模糊广义预测控制方法无论是抗干扰能力还是鲁棒性,都有了很大的提高.

Research on fuzzy GPC control system for water level of steam generator at nuclear power plant

The water level control of steam generator(SG) affects the safetys and stable of nuclear power plant directly,but because of the high complexity,nonlinear,time-varying and other characteristics of SG,the traditional cascade PID control and other control methods are difficult to obtain satisfactory control effect.On the basis of the cascade control,the fuzzy generalized predictive control(FGPC) is used to control the water level of SG in this paper.This method can take advantage of both fuzzy control and generalized predictive control(GPC).Firstly,the nonlinear system model was identified by T-S fuzzy model,and this model was transformed into linear,time-varying state space model;then,the generalized predictive controller based on the linear model was designed to control the water level of SG adaptively.The simulation results show that the FGPC control method has been greatly improved in anti-interference ability and robustness compared with the traditional cascade PID control method.