摘要
针对常规Smith预估控制方法对模型误差过于敏感的缺点,提出三种改进算法。可变死区范围的方法一改进了常规Smith控制算法因模型不能完全匹配而发生振荡的特点;变形的Smith预估器的改进方法二能较大程度地改善系统动态性能指标;增加内反馈环和匹配控制器的改进方法三适用于有不稳定极点的被控对象。经过理论分析和仿真计算结果对比,这三种方法各有优点,在适用范围内能改善延迟系统的控制品质,加强闭环系统的鲁棒性,适用于电厂自动控制系统。
As the conventional Smith predicting control is too sensitive to the model error margin, three modified Smith control methods are presented. Method 1 using variable scope of dead zone improves the conventional Smith control characteristic of oscillation as the model can not fully match. Method 2 uses transformed Smith predictor to improve the dynamic performance index of system. Method 3 adds inside feedback link and matched controller to adapt to the control object which has unstable poles. Theoretical analysis and simulation calculation results have indicated that each of the three methods has its own advantages, able to improve the controlling quality of the time-delay system and reinforce the robustness of closed-loop system within the scope, which is applicable for automatic control system of power plant.
出处
《广东电力》
2009年第7期13-17,42,共6页
Guangdong Electric Power
