1、火电厂过热汽温模糊控制的研究 I 【 摘要 】 模糊控制的基本思想就是利用计算机来实现人的控制经验。模糊控制就是用模糊数学的方法来描述 过程变量 和控制作用的关系,然后根据模糊 规则, 用模糊逻辑推理的方法得出此时刻的控制量,以达到复杂对象的最优的控制结果。 火电厂主汽温控制系统中的控制对象本身就具有滞后大和惯性大的特 点 ,并且主汽温变化的原因很多,这样系统就非常的复杂。采用传统的控制方法复杂且效果差。 本文充分利用模糊控制的动态特性好和 PI调节能消除静态偏差的特性,研究了复合模糊 控制在电厂过热汽温控制系统中的应用。并利用 MATLAB进行了仿真, 结果表 明 控制系统具有更好的抗干扰能
2、力和适应性。 关键字 :过热汽温 ; 串级控制 ; 模糊控制 ; 复合 模糊 控制 火电厂过热汽温模糊控制的研究 II 【 ABSTRACT】 The basic idea of fuzzy control is utilize computer to achieve the control experience of human. The fuzzy control use fuzzy mathematic method to depict the relationship of process viriable and control action, then base on fuzzy
3、control rules, calculating controller outputs with fuzzy logic method, so as to get the optimized control result. The superheated steam temperature in power plant has the characters of long time delay and large inertia, and many disturbance could influence this parameter, these factors make the cont
4、rol structure become complicated, and use classical control cant get satisfying result. This dissertation make full use of both the good dynamic characteristics of fuzzy control and eliminating static deviation of PI control, it research the application of composite fuzzy control in the super-heated
5、 steam temperature system of power plant. Simulation is done by application of MATLAB software. The results of simulation indicate that the control system will have better anti-disturbance capacity and adaptability. Key word: super-heated steam temperature, serial control, fuzzy control, composite fuzzy control