Actuator fault monitoring and fault tolerant control in distillation columns
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- 作者：Sulaiman Ayobami Lawal ; Jie Zhang
- 关键词：Dynamic principal component analysis ; fault detection and diagnosis ; distillation column ; fault tolerant controller ; inferential control
- 刊名：International Journal of Automation and Computing
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：14
- 期：1
- 页码：80-92
- 全文大小：
- 刊物类别：Engineering
- 刊物主题：Control, Robotics, Mechatronics; Computer Applications; Computer-Aided Engineering (CAD, CAE) and Design;
- 出版者：Institute of Automation, Chinese Academy of Sciences
- ISSN：1751-8520
- 卷排序：14
文摘
This paper presents, from a practical viewpoint, an investigation of real-time actuator fault detection, propagation and accommodation in distillation columns. Addressing faults in industrial processes, coupled with the growing demand for higher performance, improved safety and reliability necessitates implementation of less complex alternative control strategies in the events of malfunctions in actuators, sensors and or other system components. This work demonstrates frugality in the design and implementation of fault tolerant control system by integrating fault detection and diagnosis techniques with simple active restructurable feedback controllers and with backup feedback signals and switchable reference points to accommodate actuator fault in distillation columns based on a priori assessed control structures. A multivariate statistical process monitoring based fault detection and diagnosis technique through dynamic principal components analysis is integrated with one-point control or alternative control structure for prompt and effective fault detection, isolation and accommodation. The work also investigates effects of disturbances on fault propagation and detection. Specifically, the reflux and vapor boil-up control strategy used for a binary distillation column during normal operation is switched to one point control of the more valued product by utilizing the remaining healthy actuator. The proposed approach was implemented on two distillation processes: a simulated methanol-water separation column and the benchmark Shell standard heavy oil fractionation process to assess its effectiveness.