大型发电机定子接地故障柔性融合消弧方法  

Flexible Fusion Arc Suppression Method for Large Generator Stator Ground Fault

作　　者：黄俊杰 郭谋发[1,2] 张彬隆[1,2] HUANG Junjie;GUO Moufa;ZHANG Binlong(College of Electrical Engineering and Automation,Fuzhou University,Fuzhou 350108,Fujian Province,China;Fujian Province University Engineering Research Center of Smart Distribution Grid Equipment(Fuzhou University),Fuzhou 350108,Fujian Province,China)

机构地区：[1]福州大学电气工程与自动化学院,福建省福州市350108 [2]智能配电网装备福建省高校工程研究中心(福州大学),福建省福州市350108

出　　处：《电网技术》2024年第11期4748-4757,共10页Power System Technology

基　　金：福建省自然科学基金计划项目(2023J05106)。

摘　　要：大型发电机发生定子单相接地故障可能会产生电弧,导致铁心烧损,甚至引发火灾等严重事故,提出一种柔性融合消弧方法,通过并行控制中性点电压和变流器注入电流,实现接地故障电流抑制和可靠消弧。现有发电机定子单相接地柔性消弧方法在低阻或高阻的情况下消弧效果不佳,所提方法考虑了发电机的定子阻抗和定子并联分支数,适用于不同的发电机,在不同接地故障过渡电阻、不同故障位置等情况下,均能够将接地故障电流快速抑制到安全范围内。Matlab/Simulink仿真验证了所提方法的有效性。A single-phase ground fault in the stator of a large generator may produce an arc,causing core burnout or even serious accidents such as fire.A flexible fusion arc suppression method is proposed to achieve ground fault current suppression and reliable arc suppression by controlling the neutral point voltage and the converter injection current in parallel.The existing flexible arc suppression method for generator stator single-phase ground fault has a poor arc suppression effect under low or high resistance conditions.The proposed method considers the stator impedance of the generator and the number of stator parallel branches.It applies to different generators and can quickly suppress the ground fault currents to a safe range under different ground fault transition resistances,different fault locations,and so on.The effectiveness of the proposed method is verified by Matlab/Simulink.

关 键 词：大型发电机 定子接地故障 柔性消弧 电压消弧 电流消弧 融合消弧 

分 类 号：TM721[电气工程—电力系统及自动化]