Double-loop control structure for oscillatory systems: Improved PID tuning via multi-scale control scheme

2015 ◽  
Author(s):  
Jobrun Nandong
Keyword(s):  
Control Structure ◽  
Double Loop ◽  
Loop Control ◽  
Pid Tuning ◽  
Multi Scale ◽  
Oscillatory Systems ◽  
Control Scheme ◽  
Scale Control

scholarly journals Double-Loop Control Structure for Rotary Drum Granulation Loop

Processes ◽  
2020 ◽  
Vol 8 (11) ◽  
pp. 1423
Author(s):  
Ludmila Vesjolaja ◽  
Bjørn Glemmestad ◽  
Bernt Lie
Keyword(s):  
Control Structure ◽  
Control Strategies ◽  
Double Loop ◽  
The Novel ◽  
Loop Control ◽  
Process Dynamics ◽  
Oscillatory Systems ◽  
Novel Approach ◽  
Highly Oscillatory ◽  
Highly Oscillatory Systems

The operation of granulation plants on an industrial scale is challenging. Periodic instability associated with the operation of the granulation loop causes the particle size distribution of the particles flowing out from the granulator to oscillate, thus making it difficult to maintain the desired product quality. To address this problem, two control strategies are proposed in this paper, including a novel approach, where product-sized particles are recycled back to maintain a stable granulation loop process. A dynamic model of the process that is based on a population balance equation is used to represent the process dynamics. Both of the control strategies utilize a double-loop control structure that is suitable for highly oscillatory systems. The simulation results show that both control strategies, including the novel approach, are able to remove the oscillating behaviour and stabilize the granulation plant loop.

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

2014 ◽  
Vol 9 (2) ◽  
pp. 165-178 ◽  
Author(s):  
Jobrun Nandong ◽  
Zhuquan Zang
Keyword(s):  
Decentralized Control ◽  
Pid Control ◽  
Detrimental Effect ◽  
Numerical Study ◽  
Control Performance ◽  
Alternative Scheme ◽  
Multi Scale ◽  
Control Scheme ◽  
Communicative Structure ◽  
Scale Control

Abstract 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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