摘要
提出对未知输入干扰采用比例积分的估计方法 .该观测器不仅包含误差估计的比例和积分回路 ,而且在未知输入干扰的估计中增加了比例环节 ,实现了状态估计 ,加速和改善了对未知输入干扰的估计效果 .同时引入H∞ 跟踪性能指标 ,给出了观测器的设计过程 ,得到了估计误差的上界 ,并且该估计误差的上界与所设计的待定参数无关 .
A modified proportional-integral (PI) method is proposed for estimating the unknown input disturbance appearing both in process and measurement, which is an extension of the PI observers for systems with only unknown disturbance and purely integral estimation of unknown disturbance. The modified PI observer not only contains a proportional loop and an integral loop of the state estimation error, but also includes a proportional action which is added to the estimation of the unknown input disturbance. Therefore, while it can estimate the states, more important, it can improve the estimation precision of the unknown input disturbance. By introducing the H_∞ tracking performance, a design procedure is derived and the upper boundary of the estimation error is inferred, too, which is irrelevant from the parameter to be designed. At last, it is simulated that the modified proportional-integral observer is effective in estimating the states and unknown input disturbance.
出处
《沈阳工业学院学报》
2004年第2期22-26,共5页
Journal of Shenyang Institute of Technology
关键词
比例积分观测器
未知输入干扰
线性矩阵不等式
干扰估计
H∞跟踪性能
估计误差
proportional-integral observer (PIO)
unknown input disturbances
linear matrix inequality
H_∞ tracking performance
disturbance estimation
