Operation And Pricing Mechanism Research For The Integrated Power And Gas Systems Considering Dynamic Gas Flow

To address energy issues such as the energy crisis and global warming,the renewable energy has been developed rapidly.On the other hand,the integrated energy system needs to be built combining electricity,gas and cold-heat to improve the overall efficiency of energy consumption.Due to the huge potential of energy storage capacity in the gas pipelines,the integrated gas and power system with bi-directional energy conversion is one of the most promising option to accommodate the wind power.Moreover,the resource allocation is further optimized and the energy consumption cost is further reduced.Therefore,the research on modeling and operation of the integrated gas and power system is of great significance to the development of integrated energy system.In this context,this work investigates the operation and pricing mechanism issue for the integrated power and gas systems under uncertainties.The main contents are listed as follows:(1)Aiming at modeling the distinguish response times of the power system and the gas system,the dynamic gas flow equtions are formulated and linearized.On the basis,the sensitivity relational matrix of dynamic gas flow is proposed,which is more consise and beneficial to the futher research of the integrated gas and power system.Numerical results illustrate the validity and accuracy of the proposed model.(2)Based on the gas system model considering the dynamic gas flow,a robust scheduling of the ingreated gas and power system is proposed considering the wind power uncertainty.The simulation results show that the proposeed robust scheduling can make the optimal unit commitment to counter the wind power forecast error.And the system can satisfy all safe operation constraints in any wind power stochastic scene.(3)A novel scheduling method to coordinate the P2 G stations and the gas-fired plants is proposed to consider their arbitrage operation between gas market and electric power market.The bi-level optimal model for integrated gas and power system is built.Considering energy flows of power system and gas system,the dynamic subsidy and tariff are introduced to drive their optimal decision.Simulation results show that proposed scheduling method can make the stations operate following their own objective,in the meantime promoting wind power accommodation and relieving network congestion.(4)Based on the propoed bi-level optimal model of integrated gas and power system,a real-time subsidy update strategy based on robust optimization is proposed,which enables the real-time subsidy to incorpoeate the wind power deviation.The gap between the robust linear optimization and the equilibrium constrained optimization is bridged by the relationship between the regulation coefficients and the dual variables.The derivation is interpreted by both solid mathematical fundamental and clear physical meaning to the system operators.The simulation shows that the propsed update strategy can effectively update the real time subsidy to adjust the generationof the stations in responding to the deviation of wind power.