一种新的继电自整定控制器设计方法  

A Modified Auto-Tuning Method Based on Relay Feedback Identification

作　　者：王萍[1] 顾诞英[1] 张卫东[1] 

机构地区：[1]上海交通大学自动化系,上海200240

出　　处：《上海交通大学学报》2007年第8期1314-1319,共6页Journal of Shanghai Jiaotong University

基　　金：国家自然科学基金(60274032);高校博士点基金(20030248040);上海市科技启明星(04QMH1405)资助项目

摘　　要：提出了一种改进的继电辨识方法,并在满足稳定裕量的前提下,推导出最优自整定控制器参数.提出了相角偏移的概念,有效地补偿继电实验振荡点和被控对象Nyquist曲线上临界点间的偏差,从而辨识出在重要频域范围内很好表示实际对象的二阶带时滞(SOPDT)模型,提高了辨识精度;通过在线计算该相角偏移,避免了测量先验信息的重复继电实验过程,大大缩短了调节时间.仿真结果验证了该算法的实用性和有效性.An auto-tuning controller, based on the modified relay feedback identification, was designed with respect to the phase margin. A phase derivation was proposed to compensate the span between the oscillation point and critical point on the Nyquist curve. Therefore the second order plus dead time （SOPDT） can be identified in high accuracy which represents the real processes closely over a critical frequency range. The phase derivation can also be obtained on line, then model parameters can be identified in short tuning time without any prior information. The simulation experiments show the effectiveness of this method.

关 键 词：继电反馈 系统辨识 自整定 相角偏移 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]