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Available Capacity Analysis and Business Expansion Decision for Distribution Network Based on Depth-first Traversal
XU Chengsi, DONG Shufeng, WU Zhenjie, HUA Yibo, TANG Jian, YANG Xingchao
Electric Power Construction ›› 2023, Vol. 44 ›› Issue (5) : 34-42.
PDF(3303 KB)
PDF(3303 KB)
Available Capacity Analysis and Business Expansion Decision for Distribution Network Based on Depth-first Traversal
Aiming at the current problems of the rough calculation of distribution network available capacity, reliance on personal experience, and failure to give full play to the decision-making of data empowerment, this study combines available capacity with the analysis of business expansion and proposes an available capacity analysis and optimization decision method of business expansion for distribution networks based on depth-first traversal. First, considering the seasonal and daily load characteristics in the substation area, the available capacities of the feeder and public transformer were calculated based on the depth-first traversal algorithm. Second, considering the multi-objective matching of the available capacity with the load curve, load balancing, and three-phase balance in the substation area, an optimization decision model of business expansion was established, and a refined optimal load access scheme from feeder zoning to the substation area was obtained. Finally, the simulation examples using IEEE standard distribution systems and an actual distribution network were used to verify the efficiency of the proposed available capacity calculation method. It was observed that the proposed method can effectively apply the available capacity analysis results to obtain a refined load access scheme considering multiple objectives.
distribution network / depth-first traversal / available capacity / load characteristics / business expansion / distribution station area
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The new power system with new energy as the major energy resources has become the development direction of the future power grid. In the distribution system, it is manifested in the high penetration of distributed generation (DG), e.g., photovoltaic, wind power and electric vehicles (EVs). The carrying capacity of the distribution system for DG and EV is of great significance to the planning of the system. This paper firstly analyzes and summarizes the theoretical basis for evaluating the carrying capacity of distribution systems for DG and EV from four perspectives: the modeling method for DG and EV uncertainty, the site selection strategy of DG and EV charging pile/station, the evaluation index of distribution system’s carrying capacity, and the carrying capacity evaluation method. Then the paper analyzes the key technologies for improving the carrying capacity of the distribution system from the four aspects of source, network, load and storage. Finally, combined with the development trend and characteristics of China's new power system, the research on the carrying capacity of distribution systems is prospected. This review provides a useful reference for the planning of large-scale distributed new energy and new loads in distribution systems. |
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