Research On The Scheduling Of Integrated Energy System Considering The Operation Characteristics Of Power-to-gas

Building a clean and low-carbon energy system and meeting diversified energy needs are the general trends in the latest energy revolution.In this context,the National Development and Reform Commission and the National Energy Administration released the Energy Production and Consumption Transition Strategy(2016-2030)on December 29,2016,putting forward the concept of building "Internet plus" smart energy and energy Internet.This requires new technologies to dock and coordinate the operation of the power system with energy networks,such as oil and gas pipeline networks,thermal pipeline networks.Power-to-gas,an emerging technology that couples electric energy flow with natural gas energy flow,can meet this requirement.Besides,it can promote the consumption of the ever-expanding renewable energy.Therefore,research on key technologies of the integrated energy system dispatch with powerto-gas is of great significance.Previous studies in the field of power-to-gas have focused on the integrated energy system application.However,research gaps in key technologies still exist,mainly in the following points: 1)precise physical operation model is rarely built in research,resulting in the initial stage of power-to-gas application;2)effect demonstration and quantitative evaluation on the load shifting application of power-to-gas is deficient,making it difficult to highlight its advantages;3)there is a lack of strategic research on the high cost and low benefit of P2 G,hindering the commercialization of this technology;4)there is no research on the shared and collaborative dispatching of the later decentralized P2 G plants.As power-to-gas becomes more widespread,the launch of electric/gas/heat energy sharing among power-to-gas plants can improve the efficiency of integrated energy network and power-to-gas individuals.Therefore,this dissertation addresses the research gaps in the above fields and conducts research on the integrated energy system dispatch considering power-to-gas characteristics.First,this dissertation investigates the refined modeling methods for electrolysis and methanation processes of power-to-gas.For the electrolysis process,an energy consumption model based on thermodynamic equilibrium is established according to the usage of the input electricity;for the methanation process,a linear intermittent operation model is established based on the self-starting characteristics of the methanation reactor.Furthermore,this dissertation demonstrates the value of these refined models for accuracy and waste heat in electrolytic cells by comparing the dispatch case of power system.Second,this dissertation studies the collaborative load shifting effect of power-to-gas and gas-fired units in integrated power-gas system.Based on the Richards-Baker Flashiness index,a load uniformity index is proposed,and the effectiveness of this index in evaluating the load shifting effect of coupled elements such as power-to-gas is demonstrated.The concept of virtual balance is introduced,and a two-stage robust energy dispatch model based on the improved Benders decomposition algorithm is developed.Based on the load uniformity index,the impact of wind power uncertainty on the load shifting strategy and the mutual load shifting effect are analyzed.Third,based on cooperative game theory,this dissertation investigates the dispatching strategy of power-to-gas participation in multi-entity cooperation.A four-party cooperative union is considered between power-to-gas plants,distribution,cogeneration and wind power enterprises,and the union benefits are allocated based on the Shapley value method.Based on the refined physical operation model,the utilization of waste heat as a by-product is considered,and the day-ahead dispatch strategy of the integrated power-gas-heat system is optimized.By analyzing the source of electricity,a symbiosis cooperation mode between power-to-gas and wind power enterprises is formulated and its dispatch strategy is studied.Fourth,this dissertation studies the distributed dispatch strategy of multi-micro-energy network centered on power-to-gas.The power-gas and power-thermal coupling attributes of power-to-gas is considered,and a collaborative dispatch framework centered on power-to-gas and led by micro-energy network agents is established.The waste heat utilization of the refined power-to-gas model is considered,and the shared heat storage system is configured to provide capacity leasing service.A two-stage collaborative dispatch model is developed,in which the first stage solves the energy management strategy based on energy sharing,and the second stage solves the clearing strategy of shared energy based on non-cooperative game using Generalized Nash equilibrium(GNE)and alternating direction multiplier method(ADMM).