超超临界机组二模态过热蒸汽温度控制策略研究  

Double-mode control strategy of superheated steam temperature for ultra-supercritical power units

作　　者：吕彦杰[1] 牛昱光[1] 张谦[2] 

机构地区：[1]太原理工大学信息工程学院,山西太原030024 [2]内蒙古电力科学研究院,内蒙古呼和浩特010020

出　　处：《热力发电》2014年第8期71-74,79,共5页Thermal Power Generation

摘　　要：由于过热蒸汽温度具有非线性、大时变、大迟延等特点,传统PID串级控制在工况变化时难以取得较好的控制效果。对此,将内模控制与模糊控制相结合,并引入多模型理念,提出了基于内模原理和模糊控制的二模态控制方案,对国电布连电厂超超临界660MW机组直流锅炉过热蒸汽温度串级控制系统进行改进,将改进后的控制策略用于EDPF-NT DCS。结果表明,改进后的控制系统较传统过热蒸汽温度PID串级控制系统具有更强的负荷适应能力和鲁棒性,在机组负荷变化较大时仍具有良好的控制品质。Due to such characteristics as nonlinearity,large time-varying and large delay of the superheated steam temperature,the conventional PID cascade control can no obtain satisfactory effect.In this regard,by combining the internal model control with the fuzzy control and introducing the concept of multi-model,the two-mode control scheme was proposed,on the basis of the internal model principle and fuzzy control.Moreover,the superheated steam temperature cascade control system in once-through boiler of an ultra-supercritical 660 MW unit was optimized,and the improved control strategy was applied in EDPF-NT DCS.The results show that,compared with the conventional PID cascade control system,the improved control system has stronger adaptability and robustness of the load,and it still has good control quality when the unit load greatly changes.

关 键 词：超超临界机组 过热蒸汽温度 内模原理 模糊控制 多模型 二模态 

分 类 号：TM621[电气工程—电力系统及自动化] TK323[动力工程及工程热物理—热能工程]