天然气管网管段阻抗系数优化反演研究

The Optimal Inversion Research of Natural Gas Pipeline Network's Hydraulic Resistance Coefficient

天然气管网在运行中,由于管道腐蚀、局部堵塞等原因,使管网的实际工艺参数与原始设计参数之间存在差别,增大了管网仿真和优化计算的误差。采用正反分析法建立了天然气管网管段阻抗系数优化反演的数学模型。该数学模型具有非线性、多峰值的特点,采用小生境遗传算法进行求解。实例计算表明,通过优化反演修正管网工艺参数,能大大提高管网仿真结果的精确性,使管网的优化调度和运行管理更加科学和合理。

During the practical operation of the natural gas pipeline network,because of pipeline corrosion which causes diameter and roughness to change,local blockage brought by impurities and hydrate and so on.and causes that the practical process parameters of the pipeline network are not accorded with the initial design parameters, and also make the error of simulation and optimization calculation larger, so the practical application is affected. A pipe hydraulic resistance coefficient model for natural gas pipeline network is established based on positive and negative analytic approach. Based on the characteristics of the mathemati-cal model's nonlinear and multi-peak values,the paper adopts niche genetic algorithm to solve the inverse model. Example' s calculation shows that the pipeline network structural parameter amended by the inversion method can improve the precision of pipeline network simulation, therefore it makes the pipeline network's optimization dispatch and operation management more scientific and reasonable.