Identification of gas pipelines hydraulic efficiency coefficients

Andrey A Belevitin,Victoria G Ryzhkova,N.N Novitsky,E Khaltar,L.B Korelstein,M.G Sukharev,V.A Stennikov,M Negnevitsky,S.A Miedema,F.H Mirelli,C Sarica,V.R Chupin,E Todini,B Serttter,V.V Tarasevich

doi:10.1051/e3sconf/201910203002

Abstract

This study investigates the identification of non-measureable parameters of the gas transmission system (gas pipelines hydraulic efficiency coefficients). The problem statement and solution procedure are presented. The original problem is divided into two interrelated components: the nonlinear optimization problem and the temperature calculation. The nonlinear optimization problem is solved using the Successive Linear Programming (SLP) method. The problems of insufficiency of measurements and multiplicity of solutions are described, and appropriate approaches are proposed (introduction of additional subcriteria and uniting gas pipelines into groups). Identification of gas pipelines hydraulic efficiency coefficients for gas transmission systems of various complexity has been performed using the given algorithm.

Highlights

Significant discrepancies between the real gas transmission system (GTS) and its computer model occur quite often
In studies [7, 8] the statistical estimation of GTS nonmeasureable parameters is performed using the maximum likelihood method by series of measurements for stationary and non-stationary GTS modes
On the basis of the calculated gas flows through GTS sections, the temperature calculation is performed

Summary

Introduction

Significant discrepancies between the real gas transmission system (GTS) and its computer model occur quite often. Qcalc, j Lj min j 1 j 1 where K is the number of problem identifiable hydraulic efficiency coefficients; Ecalc,j is the calculated value of the gas pipeline j hydraulic efficiency coefficient; Lj is the length of the gas pipeline j; w3, w4 are subcriteria weights. In this case, it is recommended to assume the values of hydraulic efficiency coefficients to be the same for all gas pipelines of that section; 2) compressor shops operate in the independent hydraulic mode (interplant valves are closed). Each line of the GTS has an individual pressure measurement at the beginning and at the end of the section in question In such case, it is advisable to consider gas pipelines hydraulic efficiency coefficients to be different for each line of the GTS section in question

Methods

Results

Conclusion