The system-matched hold and the intermittent control separation principle
The system-matched hold and the intermittent control separation principle
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DOI：
10.1080/00207179.2011.630759
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发表时间：
2011-01-01
影响因子：
2.1
通讯作者：
Wang, Liuping
中科院分区：
文献类型：
--
作者：
Gawthrop, Peter;Wang, Liuping
间歇控制器是混合控制器的一种形式，它在基础的连续时间反馈控制系统中加入了广义采样保持机制。采样可以是非均匀的或事件驱动的。保持的一种特定形式，称为系统匹配保持（SMH），模仿闭环反馈控制信号在间歇间隔期间的行为。这篇文章表明，这种保持的选择导致间歇分离原则。特别是，这个简单的分析结果，确保当使用SMH，分离性能的基础状态估计反馈控制系统进行到间歇控制系统。SMH的这种分离原理具有重要的后果，即与零阶保持情况不同，固定采样情况下闭环系统的稳定性不依赖于采样间隔。因此，建议在采样间隔未知、时变或由事件决定的情况下，用SMH代替传统的零阶保持。
An intermittent controller is a form of hybrid controller which adds a generalised sample and hold mechanism to an underlying continuous-time feedback control system. The sampling may be non-uniform or event driven. One particular form of the hold, termed the system-matched hold (SMH) mimics the behaviour of the closed-loop feedback control signal during the intermittent intervals. It is shown in this article that this choice of hold leads to an intermittent separation principle. In particular, this simple analytical result ensures that when using the SMH, the separation properties of the underlying state-estimate feedback control system carry over to the intermittent control system. This separation principle for the SMH has the important consequence that, unlike the zero-order hold case, the stability of the closed-loop system in the fixed sampling case is not dependent on sample interval. It is therefore suggested that the SMH should replace the conventional zero-order hold in circumstances where the sample interval is unknown, time-varying or determined by events.