Resilient-Economic Coordinated Robust Operation Of Integrated Electric-Gas Systems

Interactions between power and gas systems,which are both large and complex,have been gradually intensified during the last decades,predominantly due to the propagation of large fleet natural gas-fired power units(GPUs)and the technology developments of power-to-gas(P2G)facilities.These interactions not only bring significant economic benefits to the society but also provide additional operating flexibilities,which are essential to handle fluctuations of the large-scale renewable power generation(RPG)and power system contingencies.Moreover,neglecting these interactions in power system operation may not only result in infeasible operation status in the gas systems but also increase the decision-making operation costs of both systems.Previous studies suffered from two major drawbacks,namely(1)they assumed the existence of only one utility that has full control authority over the power system and gas system;(2)the economic interactions between power systems and gas systems have been neglected,which goes against the current industrial practice.This research revisits the day-ahead resilient and economic operations of power systems considering the economic and physical interactions with gas systems,which are characterized by the modeling of bilateral energy purchase contracts and operational constraints of gas systems,respectively.The main work of the thesis is as follows:(1)Propose a tri-level resilient operational framework to optimize the operational perfor-mances of power systems under the worst-case N-k contingencies.The proposed model considers gas contracts with gas systems,where firm gas supply contracts and gas reserve contracts are formulated in the pre-and the post-contingency stages,respectively.(2)Emerging P2G facilities to mitigate the surplus RPG outputs,bidirectional gas con-tracts are inevitable.A two-stage robust model of the energy management problem for the power distribution networks(PDNs)is proposed.According to the current gas contracting mechanism,flexible real-time contracts may still be signed for the low-probability utilized reserved GPU outputs in practice.To balance the robustness and the conservativeness of the operation strategy,a two-stage distributionally robust contracting model is proposed.(3)A robust operational equilibrium solution method for the interactive markets of power and gas systems is proposed,where the bidirectional interactions include energy con-tracts,and the impacts of the uncertainties of wind generation outputs on the two markets are characterized.To guarantee the robustness of market equilibrium against uncertainties,the power and gas market-clearing models become two-stage robust ones.In brief,this thesis provides a novel perspective and solution for the resilient and economic coordinated robust operation for the integrated electric-gas systems(IEGSs)under uncer-tainties.The proposed robust scheduling decision frameworks are practically compatible with the existing industrial operations of the IEGSs,and they are expected to be employed in the operation of IEGSs with large-scale integration of RPG,extreme weather and operating failures,to provide technical and optimal energy management for improving the resilient and economic operation of IEGSs,and to realize the secure and economic operation of the integrated systems against uncertainties.