Evaluation Method of Maximum Power Supply Capacity for Precise Planning of Distribution Network

MA Yuxin; LIN Lingxue

doi:10.19725/j.cnki.1007-2322.2023.0244

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Evaluation Method of Maximum Power Supply Capacity for Precise Planning of Distribution Network

更新时间：2025-12-11

- Evaluation Method of Maximum Power Supply Capacity for Precise Planning of Distribution Network
- Issue 6, Pages: 1120-1130(2025)
- 作者机构：
  
  华南理工大学电力学院,广东省,广州市,510640
- 作者简介：
- 基金信息：
- DOI：10.19725/j.cnki.1007-2322.2023.0244
  CLC：
- Published：2025
- 稿件说明：
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MA Yuxin, LIN Lingxue. Evaluation Method of Maximum Power Supply Capacity for Precise Planning of Distribution Network[J]. 2025, (6): 1120-1130.
DOI：

MA Yuxin, LIN Lingxue. Evaluation Method of Maximum Power Supply Capacity for Precise Planning of Distribution Network[J]. 2025, (6): 1120-1130. DOI： 10.19725/j.cnki.1007-2322.2023.0244.

摘要

最大供电能力（total supply capacity ，TSC）是电网运行效率及负荷供应潜力的体现，当前关于配电网最大供电能力的评估未能考虑主变短时过载后的负荷转供，评估结果偏于保守，不利于电网精益化规划和建设工作的推进。因此，提出一种计及负荷二次转供的最大供电能力评估方法，并初步探讨分布式电源接入对电网的影响。首先，从故障主变负荷完全转移的角度研究二次转供的负荷路径；其次，计及主变容量过载及二次转供的约束，构建最大供电能力评估模型；然后，以模块化的求解方式，对模型进行线性化处理，求得加入分布式电源前后系统的TSC及各主变、馈线的TSC负载容量；最后，研究10 kV侧联络规模对TSC的影响，建立变电站主变台数配置与最佳站间联络率的关系，以提高规划的精准度。算例结果表明，所提方法可有效评估配电网最大供电能力，挖掘供电潜能，改善传统评估方法的局限性，从而提升电网资产利用率，对电网精准规划有重要指导意义。

Abstract

The total supply capacity (TSC) represents the operation efficiency and load supply potential of the power grid. Current evaluation on the maximum power supply capacity of the distribution network fails to consider the load transfer after short-term overload of the main transformer

resulting in a conservative evaluation result that hinders the promotion of lean planning and construction of the power grid. In this paper

we propose a method for evaluating the maximum power supply capacity

which takes into account the secondary load transfer. Also

the influence of distributed generation access on the power grid is explored. The load path of secondary transfer is first studied from the perspective of complete load transfer for the faulty main transformer. Secondly

a maximum power supply capacity evaluation model is constructed considering the constraints of main transformer capacity overload and secondary power transfer. Then

the TSC load capacity of each main transformer and feeder in the system before and after incorporating the distributed generation supply is determined by linearizing the model in a modular way. Finally

the influence of 10 kV side connection scale on TSC is investigated

and the relationship between the number of substation main transformer stations and the optimal inter-station connection rate is established to enhance the precision of planning. The numerical results demonstrate the effectiveness of the proposed method in evaluating the maximum power supply capacity of the distribution network

excavating the power supply potential

and improving the limitations of traditional evaluation methods. In this way

the utilization rate of power grid assets is enhanced

which has important guiding significance for accurate power grid planning.

关键词

Keywords

references

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