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    Path optimization of regional integrated energy service providers' trades based on graph theory
    ZHOU Guanting, XU Kai, LIU Jianwei, LU Baixing, ZHANG Qiao, CHEN Xin
    Integrated Intelligent Energy    2024, 46 (2): 49-58.   DOI: 10.3969/j.issn.2097-0706.2024.02.007
    Abstract22)   HTML2)    PDF (1039KB)(35)       Save

    With the deepening of the power system reform, the number of regional energy service providers will continue to increase, the grid structure will become growingly complex, and the alternative paths between power purchasers and providers will rise. In this context, a two-step selection method for regional energy service providers' trading paths is proposed. The first-step optimization selection for the trading paths is made based on a p-median model. Considering the comprehensive construction and operation cost of the energy service system, the shortest distance between an energy station and a load center, and user's load demand, a multi-objective optimization model is constructed to select sites of regional integrated energy service providers. Then, the second-step optimization selection for regional energy service providers’ trading path is made based on OD matrix and double bound gravity model. Objective functions aiming to obtain the maximum electricity transmission amounts and the maximum daily operating profits of regional energy service providers will find out the optimal energy transmission paths between regional energy service providers. The proposed models are solved by enumeration method and Dijkstra algorithm, and the calculation results are tested by a simulated case study. The simulation results show that the proposed models can effectively reduce the network loss cost, cut the abandoned wind and PV power, and improve the operating profit of regional energy service providers.

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    Stability analysis on islanded microgrids with grid-forming and grid-following converters
    ZHANG Xinyi, YANG Bo
    Integrated Intelligent Energy    2024, 46 (2): 12-18.   DOI: 10.3969/j.issn.2097-0706.2024.02.002
    Abstract22)   HTML4)    PDF (1427KB)(47)       Save

    There is stability problem in islanded microgrids dominated by electronic devices resulting from low system inertia and no frequency support,which is aggravated by constant-power load. Thus, the islanded microgrids with grid-forming and grid-following converters are studied with constant-power load taken into consideration. First, a small-signal model of a microgrid power system is developed. And the upper limit of the grid-forming converters' droop coefficient is obtained from the study on the impacts of droop coefficients on the stability by eigenvalue analysis. Then, the influences of system parameters and control parameters on the stability of small signals are analysed by participation factor. Finally, the analytical results are examined by the switching-function model constructed in Matlab Simulink.

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    Digitization of new-type electric power systems based on digital twin technology
    LI Chengyun, YANG Dongsheng, ZHOU Bowen, YANG Bo, LI Guangdi
    Integrated Intelligent Energy    2024, 46 (2): 1-11.   DOI: 10.3969/j.issn.2097-0706.2024.02.001
    Abstract39)   HTML7)    PDF (1118KB)(77)       Save

    With the proposal of the "dual carbon" target, large-scale clean energy, power electronic equipment and new-type loads are connected to the power system. The traditional power system management and control mode can hardly cope with bilateral randomness and enhanced volatility,which seriously challenges the safe and stable operation of the power system. As an important digitalization means, digital twin has become a new method for power system transformation and upgrading. In response to the profound and complex changes in the internal mechanism of new-type power systems, the development process and research status of digital twin technology applied in power systems are summarized. The digital transformation of power systems is analyzed from three aspects: requirements for new power systems' digitalization, digital modeling methods, and digital platform construction. Finally, a new power system modeling method and framework based on digital twin technology are proposed.

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