Reliability Evaluation for Integrated Electricity-Gas Systems Considering Hydrogen

Regarded as the cleanest and a versatile energy carrier, green hydrogen generated with renewable energy is receiving increased attention in the transition to a carbon-neutral society. On the other hand, the integration of hydrogen tightens the coupling between power systems and natural gas systems, which highlights the importance of reliability evaluation of the integrated electricity-gas systems (IEGSs) with hydrogen. This paper proposes a reliability evaluation model for the IEGSs considering the effects of hydrogen. The power to hydrogen and methane process is proposed to convert the surplus renewable energy to hydrogen and methane, which are then mixed into natural gas systems. A novel optimal energy shedding model is proposed to explicitly account for the impact of hydrogen on the energy flow. To consider the temporal feature of renewable energy, a sequential Monte Carlo simulation approach is applied to evaluate the reliability of the IEGSs. The numerical simulations are performed on the integrated IEEE 24-bus and 20-node energy systems and the integrated IEEE 72-bus and 40-node energy systems to verify the effectiveness of the proposed model.