High-performance multi-scale control scheme for stable, integrating and unstable time-delay processes

Abstract. This paper presents a new control strategy which unifies the direct and indirect multi-scale control schemes via a double-loop control structure. This unified control strategy is proposed for controlling a class of highly nonminimum-phase processes having both integrating and unstable modes. This type of systems is often encountered in fed-batch fermentation processes which are very difficult to stabilize via most of the existing well-established control strategies. A systematic design procedure is provided where its applicability is demonstrated via a numerical example.

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“…The details of multi-scale control (MSC) scheme can be found in [14][15][16][17]. A brief overview of the MSC scheme is presented.…”

Section: Multi-scale Control Schemementioning

confidence: 99%

A unified double-loop multi-scale control strategy for NMP integrating-unstable systems

Seer

Nandong

2016

IOP Conf. Ser.: Mater. Sci. Eng.

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“…For this reason, it is a common in industry that the feedforward controller is used together with feedback control system against certain disturbances [9]. Interestingly, both the feedback and feedforward controllers can be effectively designed based on the recently proposed multi-scale control (MSC) scheme in [10].…”

Section: Introductionmentioning

confidence: 99%

Simulation and control of water-gas shift packed bed reactor with inter-stage cooling

Saw

Nandong

2016

IOP Conf. Ser.: Mater. Sci. Eng.

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“…This new scheme is called the ICD-MSC, and it is based on the MSC scheme recently proposed by Nandong and Zang [24,25] for SISO nonminimum-phase processes. The design principle of the MSC scheme is to first decompose a given plant into a sum of basic modes, each having distinct speed of responses.…”

Section: Introductionmentioning

confidence: 99%

“…Note that the inner feedback loop is faster than the outer feedback loop. Hence, the scheme is called the MSC because of the combination of several sub-controllers with different speeds [24,25].…”

Section: Introductionmentioning

confidence: 99%

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Inter-Communicative Decentralized Multi-Scale Control (ICD-MSC) Scheme: A New Approach to Overcome MIMO Process Interactions

Nandong

Zang

2014

Chemical Product and Process Modeling

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Decentralized PID control has been extensively used in process industry due to its functional simplicity. But designing an effective decentralized PID control system is very challenging because of process interactions and dead times, which often impose limitations on control performance. In practice, to alleviate the detrimental effect of process interactions on control performance, decoupling controllers are often incorporated into a decentralized control scheme. In many cases, these conventional decoupling controllers are not physically realizable or too complex for practical implementation. In this paper, we propose an alternative scheme to overcome the performance limitation imposed by process interactions. This new control scheme is extended from the SISO multi-scale control scheme previously developed for nonminimum-phase processes. The salient feature of the new control scheme lies in its communicative structure enabling collaborative communication among all the sub-controllers in the system. This communicative structure serves the purpose of reducing the detrimental effect of process interactions leading to improved control performance and performance robustness. Extensive numerical study shows that the new control scheme is able to outperform some existing decentralized control schemes augmented with traditional decoupling controllers.

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High-performance multi-scale control scheme for stable, integrating and unstable time-delay processes

Cited by 32 publications

References 15 publications

A unified double-loop multi-scale control strategy for NMP integrating-unstable systems

A unified double-loop multi-scale control strategy for NMP integrating-unstable systems

Simulation and control of water-gas shift packed bed reactor with inter-stage cooling

Inter-Communicative Decentralized Multi-Scale Control (ICD-MSC) Scheme: A New Approach to Overcome MIMO Process Interactions

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