分布式光伏配电网无压方向元件新判据

薛士敏; 张耀文; 李玥轩; 李洪鑫; 李斌; 李博通

doi:10.19783/j.cnki.pspc.251356

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分布式光伏配电网无压方向元件新判据

应用研究 | 更新时间：2026-07-27

- 分布式光伏配电网无压方向元件新判据
- A novel current-only directional element criterion for distribution networks with distributed photovoltaic generation
- 电力系统保护与控制 2026年54卷第12期
- 作者机构：
  
  智能配用电装备与系统全国重点实验室 (天津),天津,300072
- 作者简介：
- 基金信息：
- DOI：10.19783/j.cnki.pspc.251356
  中图分类号：
- 纸质出版：2026
- 稿件说明：
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薛士敏, 张耀文, 李玥轩, 等. 分布式光伏配电网无压方向元件新判据[J]. 电力系统保护与控制, 2026,54(12).

XUE Shimin, ZHANG Yaowen, LI Yuexuan, et al. A novel current-only directional element criterion for distribution networks with distributed photovoltaic generation[J]. Power System Protection and Control, 2026, 54(12).
薛士敏, 张耀文, 李玥轩, 等. 分布式光伏配电网无压方向元件新判据[J]. 电力系统保护与控制, 2026,54(12). DOI： 10.19783/j.cnki.pspc.251356.

XUE Shimin, ZHANG Yaowen, LI Yuexuan, et al. A novel current-only directional element criterion for distribution networks with distributed photovoltaic generation[J]. Power System Protection and Control, 2026, 54(12). DOI： 10.19783/j.cnki.pspc.251356.

摘要

分布式光伏配电网中三段式电流保护需加装方向元件，传统功率方向元件在光伏低电压穿越与负序电流抑制策略的影响下易出现拒动和误动的问题，且需安装电压互感器。针对此，提出一种适用于分布式光伏配电网的无压方向元件新判据。首先，在无法获取保护背侧系统拓扑结构和多光伏信息的情况下，提出一种将分布式光伏配电网简化为单光伏配电网的等效方法。在此基础上，建立复合序网，分析系统发生正向和反向故障时序电流间的相位关系，构建基于流过保护安装处的负序电流与同一母线上无源支路的正序电流间相位差的新型无压方向判据。经过分析，该方向元件具有无需安装电压互感器、不受过渡电阻影响和适用于高比例光伏接入场景等显著优点。最后，PSCAD 仿真算例验证了所提方向元件的性能优势和简化等效方法的精确性。

Abstract

Three-stage overcurrent protection in distribution networks with distributed photovoltaic (PV) generation requires directional elements. However

traditional power directional elements are prone to maloperation and failure to operate under the influence of PV low voltage ride-through and negative-sequence current suppression strategies

and they also require voltage transformers. To address these issue

this paper proposes a novel criterion for current-only directional element suitable for distribution networks with distributed PV generation. First

in situations where the topology of the system behind the protection device and information on multiple PV units are unavailable

this paper proposes an equivalent method to simplify the distribution network with multiple distributed PV units into an equivalent single PV network. Based on this equivalent model

a composite sequence network is established

and the phase relationships among sequence currents under forward and reverse faults are analyzed. Subsequently

a novel current-only directional criterion is proposed based on the phase difference between the negative-sequence current flowing through the protected line and the positive-sequence current of a passive branch connected to the same bus. The analysis reveals that this directional element offers significant advantages

including applicability to scenarios with high PV penetration

eliminating the need for voltage transformers

and immune to transient resistances. Finally

PSCAD-based simulations verify the performance advantages of the proposed directional element and the accuracy of this simplified equivalent method.

关键词

Keywords

references

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