Abstract：Under the context of the new power system，the high share of renewable energy brings significant

challenges to the security，stability，and economic operation of the system and the grid. An uncertain optimization

scheduling model for hydrogen storage/electricity-gas integrated energy systems supported by large power grids

was proposed，considering indicators such as grid volatility，system reliability，economic performance，and

renewable energy consumption rate. The model first addressed the uncertainty of renewable energy，then used a

piecewise linearization method to solve nonlinear problems，finally，optimized the scheduling of the electricity-gas

integrated energy system by minimizing the total system operating cost and reducing grid output fluctuations. The

optimization was carried out under various constraints. Through case studies，the proposed model achieves a 3.14%

reduction in total system operating costs，a 47.02% decrease in grid volatility，and an improvement of 1.52% and

6.09% in system reliability and renewable energy consumption rate，respectively.

      Key words：integrated energy systems；power grid stability；hydrogen energy storage；power-to-gas；optimal scheduling