摘要
针对发电机组主蒸汽温度被控对象纯迟延、时变、不确定的特性,基于误差分析,提出了一种基于延迟抑制控制结构的主蒸汽温度控制策略,将基于非精确模型的闭环输出和系统实际输出加权作为冲量构成新型的控制结构,并将其与Smith预估补偿器相结合形成复合控制结构,从理论上分析了复合控制结构的鲁棒性。在机组负荷分别为37%、50%、75%、100%4种工况下,将复合控制结构与Smith预测补偿控制结构进行仿真比较。结果表明,采用复合控制结构解决了模型参数小范围时变问题,复合控制结构阶跃响应的控制效果明显优于Smith预测补偿控制结构,提高了系统抗迟延性能。
Against such characteristics as pure time delay,time-varying and uncertainty of the controlled object in main steam temperature control,a new control strategy based on anti-delay control structure was proposed,on the basis of error analysis.The inexact model based close-loop output and the actual close-loop output were weighted as a new structure＇s impulse.The new structure and the Smith predictor were combined to form a composite structure.The robust performance of the composite structure was analyzed.In addition,control effect of the composite control structure and the Smith predictive compensate control structure was compared.The results show that,the composite control structure solved the problem of timevarying within a small range,and its control effect to step response was obviously superior to that of the Smith predictive compensate control structure,which improved the anti-delay performance of the system.
出处
《热力发电》
CAS
北大核心
2014年第8期94-97,共4页
Thermal Power Generation
基金
国家重点基础研究发展计划项目(973计划)(2012CB215203)
北京市教育委员会共建项目专项资助项目
关键词
主蒸汽温度
延迟抑制
复合控制结构
加权
冲量
SMITH预估补偿器
main steam temperature
delay inhibition
composite control structure
weighted
impulse
Smith predictive compensate confroller
