Sensor fault detection, localization and reconstruction applied at WWTP

Bouzenad, Khaled; Ramdani, Messaoud; Chaouch, A.

doi:10.1109/systol.2013.6693917

Cited by 1 publication

(1 citation statement)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…where the SPE is the global squared prediction error calculated before reconstruction and SPE j is the jth sensor calculated after reconstruction, [33][34][35].…”

Section: Case Study : Wastewater Treatment Plant (Wwtp) Monitoringmentioning

confidence: 99%

Multivariate Statistical Process Control Using Enhanced Bottleneck Neural Network

Bouzenad

Ramdani

2017

Algorithms

View full text Add to dashboard Cite

Abstract:Monitoring process upsets and malfunctions as early as possible and then finding and removing the factors causing the respective events is of great importance for safe operation and improved productivity. Conventional process monitoring using principal component analysis (PCA) often supposes that process data follow a Gaussian distribution. However, this kind of constraint cannot be satisfied in practice because many industrial processes frequently span multiple operating states. To overcome this difficulty, PCA can be combined with nonparametric control charts for which there is no assumption need on the distribution. However, this approach still uses a constant confidence limit where a relatively high rate of false alarms are generated. Although nonlinear PCA (NLPCA) using autoassociative bottle-neck neural networks plays an important role in the monitoring of industrial processes, it is difficult to design correct monitoring statistics and confidence limits that check new performance. In this work, a new monitoring strategy using an enhanced bottleneck neural network (EBNN) with an adaptive confidence limit for non Gaussian data is proposed. The basic idea behind it is to extract internally homogeneous segments from the historical normal data sets by filling a Gaussian mixture model (GMM). Based on the assumption that process data follow a Gaussian distribution within an operating mode, a local confidence limit can be established. The EBNN is used to reconstruct input data and estimate probabilities of belonging to the various local operating regimes, as modelled by GMM. An abnormal event for an input measurement vector is detected if the squared prediction error (SPE) is too large, or above a certain threshold which is made adaptive. Moreover, the sensor validity index (SVI) is employed successfully to identify the detected faulty variable. The results demonstrate that, compared with NLPCA, the proposed approach can effectively reduce the number of false alarms, and is hence expected to better monitor many practical processes.Keywords: multivariate statistical process control (MSPC); bottleneck neural network (BNN); Gaussian mixture model (GMM); adaptive confidence limit (ACL); wastewater treatment plant (WWTP); benchmark simulation model No. 1 (BSM1)

show abstract

“…where the SPE is the global squared prediction error calculated before reconstruction and SPE j is the jth sensor calculated after reconstruction, [33][34][35].…”

Section: Case Study : Wastewater Treatment Plant (Wwtp) Monitoringmentioning

confidence: 99%

Multivariate Statistical Process Control Using Enhanced Bottleneck Neural Network

Bouzenad

Ramdani

2017

Algorithms

View full text Add to dashboard Cite

show abstract

Sensor fault detection, localization and reconstruction applied at WWTP

Cited by 1 publication

References 8 publications

Multivariate Statistical Process Control Using Enhanced Bottleneck Neural Network

Multivariate Statistical Process Control Using Enhanced Bottleneck Neural Network

Contact Info

Product

Resources

About