天然气管网中一类新的压缩机功率拟合函数

A new class of fitting function for compressor power in gas pipeline networks

对于大型天然气管网系统,完成一次运行优化问题的求解需要数十小时,其中压缩机功率的计算时间占绝大部分。针对应用广泛但功率计算极其复杂的离心式压缩机,为提高计算效率、加快天然气管网运行优化问题的求解速度,提出了3个新的压缩机功率拟合函数。以中国某天然气管网系统中配置的3种型号压缩机为实验对象,测试3个新的压缩机功率拟合函数的数值效果。实验结果表明,对于3种型号压缩机,3个新的压缩机功率拟合函数在精度上均有大幅度提高。此外,将3个新的压缩机功率拟合函数应用于虚拟的天然气管网系统进行运行优化问题求解测试,并与压缩机功率的传统计算方法进行对比。结果表明,使用3个新的压缩机功率拟合函数计算压缩机功率在保证求解精度的同时大大减少了求解时间。

For large natural gas pipeline networks,it takes dozens of hours to complete one operation optimisation,in which the calculation time of the compressor power accounts for the vast majority of the run time.For centrifugal compressors that are widely used but extremely difficult to calculate power consumption,in order to improve the calculation efficiency and accelerate the speed of solving operation optimisation problems,three new fitting functions of centrifugal compressor power are proposed.The numerical performances of these three new fitting functions are tested with three types of compressors as experimental objects.The experimental results show that for the three types of compressors,the accuracy of the power calculation has improved a lot after using the three new fitting functions.In addition,these three new fitting functions are applied to operation optimisation of a virtual gas pipeline network and the results are compared with the traditional method for calculating the compressor power.The numerical results show that using three new fitting functions to calculate the compressor power can greatly reduce the solution time while ensuring the accuracy of the solution.