Technoeconomic comparison of variable-speed and fixed-speed compressors in hydrogen pipeline transport

Abstract

This thesis explores the techno economic analysis of two compression strategies employed in a 1,500 km long hydrogen pipeline. Using realistic hourly demand and variable compressors modelled in python and pipeline hydraulics to account for realistic pressure drops, this study contrasts variable-speed compressors without storage with fixed-speed compressors in conjunction with large geological storage. Despite an 8% increase in CAPEX, variable-speed drives reduce compression ener-gy by ~20%, saving €45-47 M/year in electricity and levelized compression costs by 15–20%, according to integrated pipeline hydraulics and compressor performance modelling. Sensitivity analyses demonstrate additional cost savings through booster spacing optimization and operating below peak flow. Because variable-speed com-pression eliminates storage requirements and speeds up inverter payback, it per-forms better overall than fixed-speed systems.