Resilience-Oriented Operation of Integrated Electricity-Natural Gas Systems Using Hydrogen Enriched Compressed Natural Gas

Recently, the energy crisis occurred more frequently, which makes it urgent to develop resilient operating strategies for the integrated electricity-natural gas system (IEGS) by using alternative fuel resources during extreme natural disasters. As an economic solution to the transportation of hydrogen using pipelines, hydrogen enriched compressed natural gas (HCNG) has great potential value in resilience enhancement for the IEGS. This article proposed a novel resilient operating strategy of the IEGS using HCNG to provide fuel support during the emergency. First, a resilient operating model of the HCNG-integrated natural gas system is developed with the consideration of securing the gas quality and safety operation of gas turbines with insufficient gas supply. Different from the operating models formulated for the normal state, both hydrogen and methane injection are considered and their volume fractions are to be optimized in the proposed model. Furthermore, a tractable resilience-oriented operating model is reformulated using appropriate approximation techniques and it is effectively solved using the alternating optimization-integrated alternating direction method of multipliers algorithm. Case studies, performed on two test systems, are conducted to demonstrate the effectiveness of enhancing the energy crisis-resistance with the proposed strategy.