聚焦式模糊变结构控制及其在主汽温控制中的应用

Focusing variable structure fuzzy controland its application to steam temperature control of a boiler

中文关键词  模糊控制  变结构  聚焦  主汽温控制

英文关键词  fuzzy control  variable structure  focusing  steam temperature control

中文摘要

      针对具有纯滞后、大惯性、参数漂移大的非线性复杂系统, 本文提出一种聚焦式模糊变结构控制算法, 使系统在多种干扰下具 有较强鲁棒性的同时, 具有较快的响应速度. 控制器采用偏差e、 偏差变化速率^de/dt和偏差累积^∫edt作为输入信号, 利用聚焦式量化算法对这3个输入论域进行离散化, 模糊化后采用模糊变结构算法 对三维输入进行二维的模糊推理, 大大简化了模糊推理的过程. 仿真结果表明: 新算法具有很好的动态品质, 可以有效地消除系统的稳态误差. 该算法在广东某电厂2^^#机组锅炉的汽温控制系统中得到成功的应用, 其控制效果良好.

英文摘要

      In order to control the complex nonlinear system effectively, a focusing variable structure fuzzy control algorithm is presented in this paper. Firstly, the variable error e , its derivative ${\displaystyle\frac{{\rm d}e}{{\rm d}t}}$ and its integral ${\displaystyle\varint e{\rm d}t}$ are regarded as input. A focusing discretization algorithm is then applied to discretize these three input variables, and these three input variables are also fuzzed up to fuzzy sets respectively. Furthermore, a variable structure fuzzy control algorithm is applied to do 2-dimension reasoning by using 3-dimension input variables, the reasoning process is simplified greatly. Simulation result shows that the new control system has good dynamic quality and its steady error is eliminated. The proposed algorithm is applied to a steam temperature control for a boiler in a power plant of Guangdong Province, the practical control effect is proved to be satisfactory.