The state estimation of flow demands in gas networks from sparse pressure telemetry
Nichols, N. and Stringer, S.M. (1994) The state estimation of flow demands in gas networks from sparse pressure telemetry. Transactions of the Institute of Measurement and Control, 16 (2). pp. 66-74. ISSN 0142-3312
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To link to this article DOI: 10.1177/014233129401600203
This paper presents novel observer-based techniques for the estimation of flow demands in gas networks, from sparse pressure telemetry. A completely observable model is explored, constructed by incorporating difference equations that assume the flow demands are steady. Since the flow demands usually vary slowly with time, this is a reasonable approximation. Two techniques for constructing robust observers are employed: robust eigenstructure assignment and singular value assignment. These techniques help to reduce the effects of the system approximation. Modelling error may be further reduced by making use of known profiles for the flow demands. The theory is extended to deal successfully with the problem of measurement bias. The pressure measurements available are subject to constant biases which degrade the flow demand estimates, and such biases need to be estimated. This is achieved by constructing a further model variation that incorporates the biases into an augmented state vector, but now includes information about the flow demand profiles in a new form.