Abstract
Large-scale utilization of natural gas for electrical power generation, and application of gas facilities run by electricity has deepened the interconnection of electricity and natural gas systems. Meanwhile, the influence of extreme events on energy systems has increased, promoting the great significance of developing resilient energy systems. Considering gas-fired power generating units (PGUs), electricity-driven gas compressor stations (GCSs), and power to gas technology (PtG) as coupling facilities, an interdependent electricity-natural gas system (IENS) is presented in this paper. There is a bilateral and looped failure propagation as well as a two-way energy flow between two systems. A tri-level robust optimization framework is proposed for resilience enhancement of the IENS against natural disasters by combining pre-and post-disaster strategies, and the Nested C&CG approach is used to achieve its optimal solution. As a preventive planning strategy, IENS transmission components are hardened to mitigate the impact of natural disasters. Fast-response PGUs, gas storages, and PtGs are also used as emergency response resources to cope with the aftermath of disasters. Moreover, a multi-zone uncertainty set is proposed to model the effect of disasters on IENS considering damage probability of components. Numerical simulations on two IENSs demonstrate the effectiveness of the proposed methodology. The 24bus & 20node IENS results reveal that hardening only five critical components can decrease >40 % of damage to the IENS, and utilizing PtGs and gas storages reduces >20 % of load loss cost for different cases.
Published Version
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