Distributed Unbalanced Current Compensation Control in Distribution Network with Participation of Photovoltaic

FENG Qifan; XIA Yanghong; YANG Pengcheng; WEI Wei

doi:10.7500/AEPS20250324005

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Distributed Unbalanced Current Compensation Control in Distribution Network with Participation of Photovoltaic

Basic Research | 更新时间：2026-02-28

- Distributed Unbalanced Current Compensation Control in Distribution Network with Participation of Photovoltaic
- Automation of Electric Power Systems Vol. 50, Issue 2, Pages: 115-124(2026)
- 作者机构：
  
  1.浙江大学电气工程学院，浙江省杭州市 310027
  2.浙大城市学院信息与电气工程学院，浙江省杭州市 310015
- 作者简介：
- 基金信息：
  
  National Key R&D Program of China(2023YFB2407600)
- DOI：10.7500/AEPS20250324005
  CLC：
- Received：24 March 2025，
  
  Revised：2025-06-11，
  
  Online First：27 July 2025，
  
  Published：25 January 2026
- 稿件说明：
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冯启帆,夏杨红,杨鹏程等.光伏参与的配电网分布式不平衡电流补偿控制[J].电力系统自动化,2026,50(2):115-124.

FENG Qifan,XIA Yanghong,YANG Pengcheng,et al.Distributed Unbalanced Current Compensation Control in Distribution Network with Participation of Photovoltaic[J].Automation of Electric Power Systems,2026,50(2):115-124.
冯启帆,夏杨红,杨鹏程等.光伏参与的配电网分布式不平衡电流补偿控制[J].电力系统自动化,2026,50(2):115-124. DOI： 10.7500/AEPS20250324005.

FENG Qifan,XIA Yanghong,YANG Pengcheng,et al.Distributed Unbalanced Current Compensation Control in Distribution Network with Participation of Photovoltaic[J].Automation of Electric Power Systems,2026,50(2):115-124. DOI： 10.7500/AEPS20250324005.

摘要

大量三相不平衡设备并网导致台区三相电流不平衡，利用配电网台区内变流器进行不平衡电流的补偿是抑制台区负序和零序电流的有效方法。三相光伏变流器广泛用于配电网中，其剩余容量可以解决电能质量问题。文中提出了一种利用三相光伏变流器治理配电网台区不平衡电流的分布式控制策略。首先，测量流经台区变压器的三相不平衡功率；其次，根据当前时刻台区内光伏变流器的剩余容量，采用分布式控制器计算每台承担补偿任务的变流器的功率指令，通过低带宽单向通信下发该功率指令并执行；然后，对所提控制策略在通信故障情形下及两端供电网络中的适用性进行讨论；最后，在RT-LAB中进行半实物仿真验证。结果表明，所提分布式不平衡电流补偿控制能在光伏变流器电流限幅的约束下有效降低台区的不平衡电流，并能广泛适用于配电网的不同场景。

Abstract

The integration of a large number of three-phase unbalanced devices has led to three-phase current imbalance in station areas. Utilizing converters in the distribution network station areas to compensate for unbalanced currents is an effective method to suppress negative-sequence and zero-sequence currents. Three-phase photovoltaic converters are widely used in distribution networks

and their remaining capacity can be employed to address power quality issues. This paper proposes a distributed control strategy for mitigating unbalanced currents in station areas using three-phase photovoltaic converters. First

the three-phase unbalanced power flowing through the station area transformer is measured. Next

based on the remaining capacity of the photovoltaic converters in the station area at the current time

a distributed controller is used to calculate the power command for each converter tasked with compensation. This power command is then issued and executed via low-bandwidth unidirectional communication. Subsequently

the applicability of the proposed control strategy in scenarios involving communication failures and dual-end power supply networks is discussed. Finally

hardware-in-the-loop simulation is conducted in RT-LAB. The results demonstrate that the proposed distributed unbalanced current compensation control can effectively reduce the unbalanced current in the station area under the constraints of photovoltaic converter current limits and is widely applicable to various scenarios in distribution networks.

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references

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