Low-carbon operation for multi-level integrated electricity-hydrogen-gas energy systems based on committed carbon emission operation region

To effectively capture the carbon reduction potential of user-side multi-energy microgrids (MEMGs), this paper proposes a low-carbon operation method for multi-level integrated electricity‑hydrogen-gas energy systems (IEHGESs). Firstly, a multi-level IEHGES low-carbon operation framework is established based on the committed carbon emission operation region (CCEOR), which characterizes the low-carbon feasible space (LCFS) by integrating collaborative support enabled through the aggregation of user-side carbon reduction technologies. Subsequently, a CCEOR analysis method is proposed to construct the LCFS analytical expression for user-side MEMGs, which integrates distributionally robust chance-constrained approach for accounting for uncertainty and multi-dimensional region boundary piecewise linear approximation. Based on this, a low-carbon operation model incorporating the carbon reduction support from the collaboration of MEMGs is developed for multi-level IEHGESs. Finally, the effectiveness and adaptability of this work have been demonstrated through two test systems. Numerical results demonstrate that the collaborative support from the user side for carbon reduction is fully leveraged in the decarbonization of IEHGESs, while avoiding iterative interactions, reducing computational burden, and ensuring information privacy