聚焦式模糊变结构控制及其在主汽温控制中的应用

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．

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

In order to control the complexnonlinear system effectively, a focusing variable structure fuzzycontrol algorithm is presented in this paper. Firstly, the variableerror e , its derivative ${displaystylefrac{{rm d}e}{{rm d}t}}$and its integral ${displaystylevarint e{rm d}t}$ are regarded asinput. A focusing discretization algorithm is then applied todiscretize these three input variables, and these three inputvariables are also fuzzed up to fuzzy sets respectively.Furthermore, a variable structure fuzzy control algorithm is appliedto do 2-dimension reasoning by using 3-dimension input variables,the reasoning process is simplified greatly. Simulation result showsthat the new control system has good dynamic quality and its steadyerror is eliminated. The proposed algorithm is applied to a steamtemperature control for a boiler in a power plant of GuangdongProvince, the practical control effect is proved to be satisfactory.