Optimization solving method for natural gas pipeline network transmission difference calculation

Abstract

The invention relates to an optimization solving method for natural gas pipeline network transmission difference calculation, belongs to the field of natural gas transportation, and solves the problems of large error, complex process and the like of the current output difference calculation. According to the technical scheme, the method comprises the steps that firstly, a visual natural gas pipeline network model is established according to the physical structure of a natural gas pipeline network, then boundary conditions are set, then the correlativity of elements and nodes in hydraulics, thermodynamics and topology is comprehensively considered, a system calculation model of the natural gas pipeline network is established, and a four-order Runge-Kutta method is used for solving an ordinary differential equation set; and finally, the input gas amount, the output gas amount, the self-use gas amount and the deflation gas amount of the natural gas pipeline network are collected in combination with an SCADA system, and the natural gas pipeline network transmission difference and the transmission difference rate are calculated. According to the method, the influence of multiple factorsis considered, the method better conforms to the actual situation, the system operation interface and language are concise, Python and Matlab hybrid programming is utilized, the output difference calculation period is shortened, and the calculation efficiency is greatly improved.

Description

technical field [0001] The invention belongs to the field of natural gas transportation, and in particular relates to an optimal solution method for calculating the transmission difference of a natural gas pipeline network. Background technique [0002] During the pipeline transportation of natural gas, the natural gas pipeline is a unified, continuous and closed hydraulic system. According to the law of conservation of mass, if there is no leakage of natural gas during the transportation process, the transmission difference should be zero. However, since the value of natural gas is determined by measuring instruments, there are inevitably errors in measuring instruments; and as the actual working conditions of the pipeline change, the natural gas storage capacity in the pipeline will also change accordingly, so long-distance pipeline transportation In the process, there will inevitably be losses. As a profit-making organization, the natural gas company will inevitably affe...

AI Technical Summary

Problems solved by technology

However, the average pressure and temperature are difficult to accurately reflect the actual working conditions of the pipeline, so the calculated pipe stock cannot reflect the actual pipe stock of the pipeline. TGNET software can calculate the pipe stock of the pipeline, but TGNET software does not have the function of calculating the transmission difference, and its The built-in gas state equations are BWRS, SRK, Peng, etc. However, the AGA8-92DC equation is more suitable for the calculation of natural gas physical properties under pipeline transportation conditions

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