超临界水堆蒸汽温度的模糊自适应控制

Fuzzy Adaptive PI Control of Steam Temperature in a Canadian SCWR

超临界水堆(SCWR)是第四代核能系统推荐堆型中惟一的水堆,其蒸汽温度受反应堆功率影响强烈,且动态具有较强的非线性,仅采用传统的比例+积分(PI)控制方法难以达到控制效果。以Canadian SCWR为研究对象,利用移动边界方法建立蒸汽温度的动态模型。基于该动态模型设计了具有前馈和反馈的混合控制系统;反馈控制采用模糊自适应PI控制。瞬态仿真分析结果表明:前馈控制能减小功率变化时蒸汽温度的波动;模糊自适应PI控制能在线调整控制参数以改善控制性能,使蒸汽温度较快达到稳定,控制效果远比传统的PI控制更好,满足超临界水堆控制的要求。

Supercritical Water-cooled Reactor （SCWR） is the only water-cooled reactor proposed for the Generation IV nuclear system. The dynamics of its steam temperature are strongly influenced by the reactor power and also with a high degree of nonlinearity. It is difficult to control using the traditional PI control only. In this paper, moving boundary method is adopted to construct the dynamic model of the steam temperature in a Canadian SCWR. The design of the feedforward controller and fuzzy adaptive PI controller is based on the dynamic characteristics of the steam temperature. Through numerical simulation, it is found that the feedforward control can reduce the effect of the reactor power on the steam temperature. The control parameters can be tuned online using fuzzy adaptive control and the control performance can be improved. Steam temperature can promptly stabilize and the variation is reduced using the designed fuzzy control system. It is concluded that the control performance is much better than that with PI controller and the control requirements of Canadian SCWR are satisfied.