2025年4月2日 周三
首页 > 过刊浏览>2025年第40卷第1期 >146-154. DOI:10.19781/j.issn.1673-9140.2025.01.015
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海上风电直流送出系统单极接地故障暂态特征分析
作者:
作者单位:

(1.广东电网有限责任公司广州供电局，广东 广州 510620;2.湖南工业大学电气与信息工程学院，湖南 株洲 412007;3.长沙理工大学电气与信息工程学院，湖南 长沙 410114)

通讯作者:

汪 华（1987—），男，硕士，工程师，主要从事新型电力系统故障保护及控制研究；E?mail：563395121@qq.com

中图分类号:

TM614

基金项目:

湖南省自然科学基金(2021JJ40172)


Transient characteristic analysis of unipolar grounding faults in DC transmission system for offshore wind power
Author:
Affiliation:

(1.Guangzhou Power Supply Bureau of Guangdong Power Grid Co., Ltd., Guangzhou 510620, China; 2.College of Electrical and Information Engineering, Hunan University of Technology, Zhuzhou 412007, China; 3.School of Electrical ＆ Information Engineering, Changsha University of Science ＆ Technology, Changsha 410114, China)

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    摘要:

    针对大规模海上风电直流（direct current,DC）送出系统的故障电流分布呈现新特征的问题，分析海上风电直流送出系统线路发生单极接地故障时的故障暂态特征及其影响机理。单极接地故障响应过程可分为直流侧电容放电、网侧电流馈入和电压恢复3个暂态阶段。首先，推导海上风电直流送出系统发生单极接地故障时各个暂态阶段故障电流的数学表达式，并建立其等效电气模型；随后，根据接地电阻的阻值将故障过程划分为过阻尼、欠阻尼状态，并分析接地电阻对系统故障特征的影响；最后，在MATLAB/SIMULINK仿真软件中搭建±10 kV海上风电直流送出系统仿真模型，验证该系统发生单极接地故障时暂态特征理论分析的正确性。

    Abstract:

    The fault current distribution of direct current (DC) transmission systems for large-scale offshore wind power presents new characteristics. To address this issue, the transient fault characteristics of the DC transmission system line in offshore wind power when a unipolar grounding fault occurs are analyzed, as well as its influence mechanism. The response process of unipolar grounding fault can be divided into three transient phases: DC-side capacitor discharge, grid-side current feeding, and voltage recovery. The mathematical expressions of fault currents in the transient phases of unipolar grounding fault in the DC transmission system in offshore wind power are derived, and the equivalent electrical model is established. According to the resistance value of the grounding resistor, the fault process is divided into over-damped and under-damped states, and the influence of the grounding resistor on the fault characteristics of the system is analyzed. Finally, a simulation model of ±10 kV DC transmission system in offshore wind power is constructed in MATLAB/SIMULINK simulation software, which verifies the correctness of the theoretical analysis of the transient characteristics of the system in the event of a unipolar grounding fault.

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汪 华,张 文,何 东,等.海上风电直流送出系统单极接地故障暂态特征分析[J].电力科学与技术学报,2025,40(1):146-154.
WANG Hua, ZHANG Wen, HE Dong, et al. Transient characteristic analysis of unipolar grounding faults in DC transmission system for offshore wind power[J]. Journal of Electric Power Science and Technology,2025,40(1):146-154.

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