Anomaly detection for natural gas regulator stations

Natural gas regulator stations control the flow of gas across PG&Es gas transmission and distribution system. Ensuring the proper functioning of these-stations is critical for the safety of the natural gas system. Currently, PG&E uses sensors linked to a Supervisory Control and Data Acquisition (SCADA) system to monitor pressure and other characteristics of select regulator stations, with continuing installation of new sensor systems across the network. PG&E seeks to develop algorithms for detection and prediction of safety issues before they occur, as well as monitor performance degradation in a regulator station. First, analysis of historical failure events was conducted to better understand the varying causes of regulator overpressure events and their corresponding downstream pressure patterns. Then, downstream pressure time-series data was collected and processed for each regulator station. Useful features from these time-series were extracted, including day-today changes and moving averages. Piecewise linear segmentation was also performed on the time-series to extract relevant features. These features were then used to cluster stations by their operating characteristics, grouping stations with similar volatility and pressure patterns. Anomaly detection methods were then developed and calibrated for the station clusters. We use a variety of statistical process control techniques, including CUSUM and EWMA to detect changes in the behavior of a regulator downstream pressure time-series. Detection algorithms were then evaluated with and without clustering using ROC curves on simulated pressure anomalies. Ultimately, we show that modified CUSUM and adaptive sliding window techniques can detect pressure anomalies in natural gas regulators with reasonable false positive rates. We also show how improvements to data handling and sharing at PG&E can facilitate better algorithms for regulator anomaly detection.

Department dc:contributor.department

Leaders for Global Operations Program at MIT

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2016

Author dc:creator

• Chao, Adam Christopher

Advisor dc:contributor.advisor

• Saurabh Amin and Georgia Perakis.

• Sloan School of Management.
• Institute for Data, Systems, and Society.
• Engineering Systems Division.
• Leaders for Global Operations Program.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/104404

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/104404