Set point weighted modified Smith predictor for delay dominated integrating processes

Somak Karan, C. Dey
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引用次数: 2

Abstract

A process having any pole at origin is said to be integrating in nature. In practice, it is difficult to obtain the desired output from such integrating processes with significant time delay. Pure integrating processes have inherent non self-regulating feature and hence if they are disturbed from their equilibrium condition, process output continuously fluctuates over a considerable period of time. In practice a number of industrial processes like combustion chamber, distillation column, chemical reactors are well-known integrating processes with considerable time delay. Smith predictor based control technique is an established methodology for controlling such processes with considerable dead time. But, this technique fails to perform satisfactorily for pure integrating processes with considerable time delay. Modified Smith predictor method by Majhi and Atherton may be considered to be a good alternative. However, its performance is not found to be quite satisfactory due to undesired overshoot and sluggish recovery. In addition, complexity lies with the tuning of three controllers involved in multi-loop structure. To overcome this limitation, a simple tuning methodology is proposed here for modified Smith predictor with two controllers only. Efficacy of the proposed mechanism is substantiated through performance evaluation of pure integrating processes with significant time delay in comparison with well-known modified Smith predictor tuning reported by Majhi and Atherton.
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时滞主导积分过程的设定值加权修正Smith预测器
在原点有任何极点的过程在本质上被称为积分过程。在实际应用中,这种时滞较大的集成过程很难得到期望的输出。纯积分过程具有固有的非自我调节特性,因此,如果它们从平衡状态中受到干扰,过程输出将在相当长的一段时间内持续波动。在实践中,许多工业过程如燃烧室、精馏塔、化学反应器等都是众所周知的具有相当时间延迟的集成过程。基于Smith预测器的控制技术是一种成熟的方法,用于控制这种具有相当死时间的过程。但是,对于具有较大时间延迟的纯积分过程,该技术的性能不能令人满意。由Majhi和Atherton改进的Smith预测方法可以被认为是一个很好的替代方法。然而,由于不希望的超调和缓慢的恢复,它的性能不是很令人满意。此外,复杂性还在于多回路结构中涉及的三个控制器的整定。为了克服这一限制,本文提出了一种简单的调整方法,用于仅具有两个控制器的修改Smith预测器。通过对具有显著时间延迟的纯积分过程的性能评估,与Majhi和Atherton报道的著名的修正Smith预测器调谐进行比较,证实了所提出机制的有效性。
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