Economic Impact of Power to Gas in Integrated Electricity and Gas System with High Wind Penetration

Electricity and gas network have a tendency to be integrated in system planning and energy dispatch to achieve higher efficiency and complementarity. Power to gas (PTG) is a recently developed energy conversion technique. It consumes electricity and transfer raw material into gas, which can be injected to the gas distribution system. Along with gas-tired units (GFUs), it gives a bidirectional interaction between gas and electricity system. This raised new challenges for operation of integrated electricity-gas system (IEGS), especially when installed with a large portion of renewable energy generation. This paper proposed an economic dispatch model of IEGS with bidirectional energy flow. Wind generations were multi-state modeled, and simulated utilizing time-sequential Monte-Carlo simulation technique, which is novel in IEGS evaluation. An optimal power flow in IEGS was calculated. Multi-dimensional indices are defined, and calculated to evaluate the impact of PTGs on IEGS under an IEEE and gas test system.