模糊控制在火电厂燃烧控制系统中的应用与研究.doc

（ 二 〇 〇 八 年 六 月  摘 要 锅炉燃烧系统是火电厂中的一个重要环节。由于燃烧系统的被控对象是非线性、时变、大死区、多变量耦合的复杂系统，没有确切的数学模型，对其采用常规PID控制难以获得令人满意的控制效果。在这种情况下，将先进的现代控制理论应用于计算机控制系统中，完善锅炉燃烧控制系统，越来越受到广大电力生产企业的关注。 本文针对火电厂燃烧控制系统进行了理论研究，由动态特性分析，确定被控对象的传递函数。然后，结合模糊控制的基本理论，经过解决输入量的模糊化、控制规则的建立和输出量的精确化三大问题，在给煤-主汽压力控制系统中引入单模糊控制器，并运用MATLAB中的SIMULINK系统建立常规PID控制系统仿真模型和单模糊控制系统仿真模型，进行仿真试验。最后，通过仿真结果对比得出：模糊控制器的控制性能总体优于常规PID控制器，它不仅具有良好的动态特性，而且具有较强的环境适应能力。 关键词:火电厂；燃烧控制系统；模糊控制；SIMULINK仿真 Abstract The combustion system of boiler is a kind of important form in modern electric power production. But the controlled object of power station burning system is the complex system of timing change, big lagging and multi-variable coupling, it is difficult to adopt the routine PID to obtain the satisfactory control result, because there is no accurate mathematical model. In the case, adopting advanced modern control theory in computer control system and improving boiler burning system have been concerned by more and more electricity enterprises. This article has conducted the fundamental research in view of the thermoelectric power station combustion control system, and determined the transfer function of controlled object by dynamic analysis. Then, combined with fuzzy controls elementary theory, solve the three problems of determining the input domain ,establishing the fuzzy control rules and converting input parameters to fuzzy data. And in bolier supply coal-main steam pressure control system of power plant using the SIMULINK system of MATLAB establish the conventional PID control system simulation model and Single Degree Fuzzy control system simulation model,then carries on the simulation testing. Finally, we obtains through the simulation result contrast: The fuzzy controllers control performance overall surpasses the conventional PID controller. it not only has the good dynamic characteristic, and has the strong environment adaptiveness. Keyword: fire power station; combustion control system; fuzzy control; The