Differentiated Governance Strategies for Distribution Transformer Overload and Three-Phase Imbalance Considering Source-Load Regulation

doi:10.11930/j.issn.1004-9649.202501016

Abstract

Abstract:

Aiming at the mixed problems of three-phase imbalance and heavy overload of distribution transformers caused by large-scale access of single-phase distributed photovoltaic and single-phase charging piles, a differentiated governance strategy for heavy overload and three-phase imbalance of distribution transformers considering source-load regulation is proposed. Firstly, a substation imbalance and heavy overload model considering the randomness of photovoltaic charging is established, and the influence of the uncertainty of photovoltaic output and charging behavior on the three-phase imbalance and heavy overload of the substation is analyzed. Secondly, a substation evaluation and clustering model considering the potential of source-load regulation is established, and the substations with the potential of source-load regulation are mined as control clusters; finally, a substation regulation model considering three-phase imbalance and heavy overload is established, with three-phase imbalance, load rate and network loss as the objective function, considering the coordinated control of aggregated photovoltaic control, aggregated charging power control, energy storage and reactive power compensation, and solving it by NSGA-Ⅱ algorithm and maximum fuzzy satisfaction method. The IEEE33 node example model is used for simulation verification, and the results show that this method can effectively manage the mixed problems of three-phase imbalance and heavy overload in the substation.

Key words: distribution transformer, overload, three-phase Imbalance

YANG Qiang, LUO Yingting, SHI Mo, JIANG Junfei, RUAN Dihang, LIU Shengyang, YAN Qin, MA Rui. Differentiated Governance Strategies for Distribution Transformer Overload and Three-Phase Imbalance Considering Source-Load Regulation[J]. Electric Power, 2025, 58(8): 41-49.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202501016

https://www.electricpower.com.cn/EN/Y2025/V58/I8/41

Figures/Tables 13

References 32

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运维特性	说明	计算方法
重过载次数	负载率大于80%持续15 min记一次	一个月内总次数
重过载累计时间	负载率大于80%累计时间	一个月内累计总时间
最大负载率	一个月内最大负载率	$ \dfrac{变压器最大负荷}{变压器容量}\times 100\text{%} $
三相不平衡次数	三相不平衡度大于15%持续超过15 min记一次	一个月内总次数
三相不平衡累计时间	三相不平衡度大于15%累计时间	一个月内累计总时间
最大不平衡度	一个月内最大三相不平衡度	$ \dfrac{最大相电流\text{-}最小相电流}{最大相电流}\times 100\text{%} $
台区光伏渗透率	反应光伏出力在台区中占比	$ \dfrac{台区光伏装机容量}{变压器最大负荷}\times 100\text{%} $
台区充电桩渗透率	反应充电负荷在台区中占比	$ \dfrac{台区充电桩容量}{变压器最大负荷}\times 100\text{%} $
光伏三相接入不平衡率	反应分布式光伏的不平衡接入	$ \dfrac{最大相光伏容量-最小相光伏容量}{最大相光伏容量}\times 100\text{%} $
充电桩三相接入不平衡率	反应充电桩的不平衡接入	$ \dfrac{最大相充电桩容量-最小相充电桩容量}{最大相充电桩容量}\times 100\text{%} $

运维特性	说明	计算方法
重过载次数	负载率大于80%持续15 min记一次	一个月内总次数
重过载累计时间	负载率大于80%累计时间	一个月内累计总时间
最大负载率	一个月内最大负载率	$ \dfrac{变压器最大负荷}{变压器容量}\times 100\text{%} $
三相不平衡次数	三相不平衡度大于15%持续超过15 min记一次	一个月内总次数
三相不平衡累计时间	三相不平衡度大于15%累计时间	一个月内累计总时间
最大不平衡度	一个月内最大三相不平衡度	$ \dfrac{最大相电流\text{-}最小相电流}{最大相电流}\times 100\text{%} $
台区光伏渗透率	反应光伏出力在台区中占比	$ \dfrac{台区光伏装机容量}{变压器最大负荷}\times 100\text{%} $
台区充电桩渗透率	反应充电负荷在台区中占比	$ \dfrac{台区充电桩容量}{变压器最大负荷}\times 100\text{%} $
光伏三相接入不平衡率	反应分布式光伏的不平衡接入	$ \dfrac{最大相光伏容量-最小相光伏容量}{最大相光伏容量}\times 100\text{%} $
充电桩三相接入不平衡率	反应充电桩的不平衡接入	$ \dfrac{最大相充电桩容量-最小相充电桩容量}{最大相充电桩容量}\times 100\text{%} $

标度		含义
1		两个指标同等重要
3		一个指标略微重要于另一个
5		一个指标明显重要于另一个
7		一个指标显著重要于另一个
9		一个指标极其重要于另一个
2，4，6，8		2、4、6、8 表示两个指标在相邻情况之间的差异之间

标度		含义
1		两个指标同等重要
3		一个指标略微重要于另一个
5		一个指标明显重要于另一个
7		一个指标显著重要于另一个
9		一个指标极其重要于另一个
2，4，6，8		2、4、6、8 表示两个指标在相邻情况之间的差异之间

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