基于MFAC-PID的核电站蒸汽发生器水位控制

Level Control in Steam Generator of a Nuclear Power Plant Based on MFAC-PID

核电站蒸汽发生器水位的控制性能不好是引发机组非计划停堆的主要原因。尤其在低功率平台下,蒸汽发生器水位的"缩涨效应"明显,并且给水流量和蒸汽流量的测量误差较大,利用传统的控制方案来控制水位的稳定比较困难。对此,本文提出了一种无模型自适应(MFAC)控制策略,即外环采用MFAC控制,内环采用PID控制。仿真结果表明,与传统蒸汽发生器的PID串级控制相比,本文提出的控制方法具有更好的稳定性,同时,抗干扰性和鲁棒性也优于现行的PID串级控制。此外,MFAC的设计过程和结构简单,便于工程应用。

Poor control of the steam generator water level is the main cause of unplanned reactor shutdowns in nuclear power plants.Particularly,at low power levels,it is a difficult task to control the water level due to the shrink and swell phenomena and the unreliable flow measurements.In this paper,a model-free adaptive control（MFAC）strategy is proposed,in which the MFAC is used in the primary control loop and the PID controller is adopted in the secondary loop.The simulation results show that,compared with the cascade PID control,the proposed control method has better stability,adaptability,and robustness.Moreover,it is suitable for industrial applications due to its simple structure and easy implement.