Two stage Robust Nash Bargaining based Energy Trading between Hydrogen-enriched Gas and Active Distribution Networks

Abstract: Integration of emerging hydrogen-enriched compressed natural gas (HCNG) distribution network with active distribution net-work (ADN) provides huge latent flexibility on consuming re-newable energies. However, paucity of energy trading mechanism risks the stable earnings of the flexibility for both entities, especially when rising highly-efficient solid oxide fuel cells (SOFCs) are pioneered to interface gas and electricity. To fill the gap, a two-stage robust Nash bargaining strategy is pro-posed. In the first stage, a privacy-preserved Nash Bargaining based on the ADMM is applied to clear energy trading between the two autonomous entities, i.e., ADN and gas distribution network (GDN). Via robust dispatch of configured energy storage in ADN, the next stage de-risks ADN profit collapse from transaction biases, caused by forecasting errors of distributed energy resources. C&CG is finally utilized to loop the two stages. The convergence of the entire energy trading strategy is theoretically proved. As such, sustain-able returns from the integration of ADN and GDN bridged by SOFC and HCNG are facilitated. Numerical studies indicate that, the proposed cooperative strategy reaps a stable social welfare of nearly 1.6% to total cost, and benefit-steady situations for both ADN and GDN, even in the worst case.