Splitting model and rapid simulation for large-scale natural gas pipeline networks.

The article focuses on the development and validation of a novel simulation method called the linearized lumped parameter model (LLPM) for large-scale natural gas pipeline networks. LLPM integrates the Lanczos integral formula and Taylor expansion to consider inertial and gravity terms, and combines with a linearized finite difference method (FDM) to decouple pipeline boundary conditions, enabling independent and faster simulation of pipelines and nodes. Tested on a typical triangulation network and a real offshore pipeline network of 930.36 km, LLPM achieved simulation accuracy comparable to fully implicit FDM with an average error of 0.92%, while improving computational speed by over 130 times. The method overcomes limitations of traditional lumped parameter models by providing detailed pressure and flow profiles along pipelines and effectively handling large elevation variations. Future work includes extending the model to incorporate equipment like compressors and valves and exploring parallel computing for further speed enhancements.