Non-isothermal dynamic model and collaborative optimization for multi-energy system considering pipeline energy storage

The multi-energy system consisting of electricity networks, hydrogen enriched compressed natural gas (HCNG) networks, and district heating networks is considered a vital strategy for achieving carbon reduction and addressing climate change. A deeper investigation of dynamic energy network modeling considering thermodynamic behaviors and its energy storage potential is necessary. This paper proposes a non-isothermal dynamic model of multi-energy system based on generalized phasor modeling method. The energy network dynamics and the relative security enhancement effects under non-isothermal conditions are analyzed. A novel optimal power-HCNG-thermal flow (OPHTF) model is proposed to incorporate the non-isothermal laws and dynamic network properties into the coordinated operation of multi-energy system. The numerical studies demonstrate that the proposed approach significantly improves computational efficiency, reduces operational costs, and effectively accommodates renewable energy.