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Title: Gas Transmission System Simulation
Author: Theo A. G. Barker
Source: American Gas Association 1990
Year Published: 1990
Abstract: The gas transmission system simulator consists of a computer-based model used in an operational environment. The effect of any control action the gas dispatcher might execute can be examined by use of the simulator. With the simulator, the behavior of the gas network can be simulated from the current moment up to 48 hours ahead. The Supervisory Control and Data Acquisition (SCADA) system provides measured pressures and flows to the simulator. With a parallel model State Estimator) ail pressures and flows over the whole grid are calculated to provide a starting situation for the predictive model. A hundred offtake flows are predicted by a load-forecast model, which receives direct information from the meteorological office. All compressor and reducer setpoints can be provided via graphic screens. The same applies to pipeline connection changes in the network. As a result of a predictive simulation, predictive messages are generated. Via plots and predictive mimic diagrams, the results can be evaluated. The gas transport system that is simulated consists of 4500km of pipehne segmented into 600 sections, 20 supply points, 100 offtake points, up to 7 pipelines in parallel, 7 compressor stations, 2 interlinked transport systems each carrying a different type of gas, and 5 mixing stations. The computer hardware used is a VAX 11/785 with 500 Megabytes of background storage and an attached processor: FPS 164. The simulator was put into operation during 1985 at Gasunie in the Netherlands.

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