An operating state estimation model for integrated energy systems based on distributed solution
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RESEARCH ARTICLE
Dengji ZHOU, Shixi MA, Dawen HUANG, Huisheng ZHANG, Shilie WENG
An operating state estimation model for integrated energy systems based on distributed solution
© Higher Education Press 2020
Abstract 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 consumption 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 subsystems 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 paper. 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
Received Jul. 22, 2019; accepted Aug. 29, 2019; online Sept. 15, 2020
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Dengji ZHOU, Shixi MA, Dawen HUANG, Huisheng ZHANG ( ), Shilie WENG Key Laboratory of Power Machinery and Engineering of the Ministry of Education, Shanghai Jiao Tong University, Shanghai 200240, China E-mail: [email protected]
time. The proposed method is more accurate and efficient in energy allocation and utilization. Keywords integrated energy system, state estimation, electricity-gas coupling energy system, nonlinear coupling, distributed solution
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Introduction
Integrated energy systems focus on building the interconnection framework of smart grid, thermal pipeline network, natural gas pipeline network, transportation network and other types of networks [1], so as to achieve the goals such as the coordinated transformation of multiple energy forms and coordinated operating of centralized and distributed energy sources [2]. Compared with the traditional energy supply systems which are planned, designed, and operated independently, the integrated energy system can organically integrate the energ
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