As the key node of urban gas transmission and distribution system, safe and stable operations of gas station are highly dependent on continuous and high-quality electric energy supply. In this paper, the systematic research is carried out combining with the reliability theory and energy storage technologies of electrical power system aiming at the vulnerability of power supply system for key equipment in gas station (take the city gas gate station and LNG peak-shaving station as examples). Firstly, identify such key sensitive loads as compressor, electric drive pressure regulating device, safety instrumented system (SIS) and process control system (PCS) based on the architecture of power supply and distribution system as well as load characteristics in typical gas station; secondly, the influence probability and severity of consequences of such accidents as external power grid failures, internal electrical failures and voltage sag on key loads are with quantitative analysis by establishing vulnerability evaluation model of power supply system combining with the probabilistic risk assessment (PRA) and sequential Monte Carlo simulation; finally, the enhancement strategies taking energy storage system (including but not limited to UPS, flywheel energy storage, super capacitor and hybrid energy storage) as the core are proposed, optimum collocation model of energy storage capacity with the targets of power supply reliability, power quality improvement and full life cycle economy is established as well as emulation proof is carried out with the platforms of ETAP and MATLAB/Simulink.

gas station  /  power supply system  /  energy storage system  /  vulnerability evaluation  /  probabilistic risk assessment  /  reliability optimization