【摘要】 锅炉过热汽温直接影响火电厂的安全经济运行,而过热汽温被控对象具有大迟延、时变、非线性等特点,常规PID控制调节时间长、易产生超调或振荡。为了优化对过热汽温的控制,提出一种基于加权多模型的过热汽温改进模糊控制方法。在结合常规模糊自整定PID控制和基于控制历史的模糊控制的基础上引入分散推理思想,设计一种改进模糊控制器。在控制过程中,系统实际控制器的输出通过加权各局部模型的控制器输出实时获取。仿真结果表明,上述方法的控制性能明显优于常规PID控制,超调量及调节时间等方面都得到改善,对工况变化具有优良的适应性。更多还原

【Abstract】 The superheated steam temperature of boiler directly affects the safe and economical operation of thermal power plant. And due to the long time delay,time-varying and nonlinear properties of the superheated steam temperature,conventional PID control adjustment time is long and easy to produce overshoot or oscillation. In order to improve the control effect,an improved fuzzy control method for superheated steam temperature was designed based on weighted multiple model. Through conventional fuzzy self-tuning PID control and control history based fuzzy control,the idea of decentralized inference was introduced,and an improved fuzzy controller was designed. In the control process,the output of actual controller of the system was obtained in real-time by weighting the controller of each local model. The simulation results show that the control performance of the method is obviously superior to conventional PID control,overshoot and adjustment time have been improved,and has good adaptability to the change of working conditions.更多还原