Cross-border Comprehensive Energy Market Clearing Model And System Reliability Assessment

Integrated Energy System(IES)is the practical application and development direction of the multi-energy flow coupling system,and it is also the core technology that supports the Energy Internet.At present,cross-border energy transactions are frequent,and the cross-border integrated energy system(CBIES)has opened up new trading channels and market forces for the cross-border energy market,but the transaction mechanism and clearing method are not yet complete.This brings difficulties to cross-border multi-energy flow market transactions.At the same time,the cross-border interconnection of the integrated energy system poses a challenge to stable and safe operation.Energy privacy and data barriers between countries have created many problems for the reliability assessment of the system.In this context,this paper conducts theoretical research on integrated energy system modeling,cross-border interconnection models,cross-border electricity-gas integrated energy system market clearing models,and system reliability assessment.The main summary is as follows:First,combined with the energy circuit theory,the gas flow of the gas network and the oil flow of the oil network were mathematically modeled,and an oil circuit model similar in mathematical form to the circuit theory was derived,which further improved the energy circuit theory.Energy circuit theory lays a theoretical foundation for subsequent reliability assessment.This paper analyzed the interconnection mode of cross-border energy,summarizesd the cross-border interconnection(CBI)and cross-national/continental interconnection(CNI/CCI),and considers the impact on system reliability assessment at the physical level and assessment level.Considering the uncertainty of energy supply in cross-border interconnection,the decoupling and disconnecte model(D&DM)is established.It provides a reference for the design of the system reliability assessment mechanism.For cross-border electricity-gas integrated energy system,considering the incomplete rationality of market participants,a three-level optimization model of bidding-clearing in domestic cross-border two-level market based on evolutionary game is proposed.Combined with KKT conditions,the three-level model is simplified to two-level model.Aiming at the domestic-cross-border two-tier market bidding-clearing model based on evolutionary game in Chapter 4,a two-tier market parallel coupling clearing model is designed,and the multi-objective optimization part is based on NSGA-?.A niche technology with preference selection(Preference selection niche technology,PSNT).Through the analysis of numerical examples,the feasibility and effectiveness of the proposed model and algorithm are verified.On the basis of the energy circuit theory,a general model is established for the reliability of the cross-border integrated energy system based on the vector Lz transformation,and the vulnerability index is used to reversely characterize the reliability of the system,and the reliability of the cross-border energy system is also considered.For issues such as energy privacy and data barriers brought about by interconnection,a cross-border integrated energy system reliability collaborative assessment mechanism was designed.Finally,a numerical example is used to verify the accuracy of the proposed assessment method and the effectiveness of the model.