模糊预测控制在循环水加药控制中的应用

Application of fuzzy predictive control to the chemical adding control of circulating water

针对模糊控制和预测控制的特点,提出了一种模糊预测控制方法,利用模糊逻辑实现被控对象模糊化,解决被控对象难以建立的问题;利用预测控制,根据系统当前信息预测出系统未来的变化趋势,解决被控对象滞后问题。以火电厂循环水加药控制为例,对该控制方法进行了仿真和实际应用研究。结果表明,该系统能有效地避免纯滞后环节在控制系统中带来的振荡现象,工程应用取得了理想的控制效果,为纯滞后、大惯性、模型不确定系统的控制提供了很好的解决方法。

In the light of the characteristics of predictive control and fuzzy control, a method of fuzzy predictive control is introduced. The fuzziness has been implemented by using fuzzy logic, to solve the problems that are difficult to be established regarding the controlled object. Predictive control has been made use of, based on the present information of the system to predict the future tendency of changes, and to solve the problem of the lagging of the controlled object. Taking the chemical adding control of circulating water at a heat power plant as example, this control method has been stimulated and studied in practice. The results show that the system can avoid the using this oscillation, caused by the pure lagging in the control system. Ideal control effect has been obtained by method, and it has provided a very good method for controlling the pure lagging, inertia and mode uncertainty system.