An operating state estimation model for integrated energy systems based on distributed solution

查看全文 作　　者：Dengji [1]ZHOU;Shixi [1]MA;Dawen [1]HUANG;Huisheng [1]ZHANG;Shilie [1]WENG

机构地区：[1]Key Laboratory of Power Machinery and Engineering of the Ministry of Education,Shanghai Jiao Tong University,Shanghai 200240,China

出　　处：《Frontiers in Energy》索引2020年第14卷第4期,共16页

基　　金：the National NaturalScience Foundation of China (Grant Nos. 51706132 and 51876116);National Science and Technology Major Project (Nos. 2017-1-0002-0002,and 2017-1-0011-0012). 摘　　要：In view of the disadvantages of the traditional energy supply systems,such as separate planning,separate design,independent operating mode,and the increasingly prominent nonlinear coupling between various subsystems,the production,transmission,storage and corn sumption of multiple energy sources are coordinated and optimized by the integrated energy system,which improves energy and infrastructure utilization,promotes renewable energy consumption,and ensures reliability of energy supply.In this paper,the mathematical model of the electricity-gas interconnected integrated energy system and its state estimation method are studied.First,considering the nonlinearity between measurement equations and state variables,a performance simulation model is proposed.Then,the state consistency equations and constraints of the coupling nodes for multiple energy sub-systems are established,and constraints are relaxed into the objective function to decouple the integrated energy system.Finally,a distributed state estimation framework is formed by combining the synchronous alternating direction multiplier method to achieve an efficient estimation of the state of the integrated energy system.A simulation model of an electricity-gas interconnected integrated energy system verifies the efficiency and accuracy of the state estimation method proposed in this pape.The results show that the average relative errors of voltage amplitude and node pressure estimated by the proposed distributed state estimation method are only 0.0132%and 0.0864%,much lower than the estimation error by using the Lagrangian relaxation method.Besides,compared with the centralized estimation method,the proposed distributed method saves 5.42 s of computation time.The proposed method is more accurate and efficient in energy allocation and utilization. 关键词：integrated energy system state estimation electricity-gas coupling energy system nonlinear coupling distributed solution

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An operating state estimation model for integrated energy systems based on distributed solution

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