摘要
小电流接地配电网系统发生单相接地故障时具有故障特征微弱的固有缺陷,同时故障特征还要受到高阻接地、三相不对称和噪声等外界因素的干扰,使得配电网单相接地故障定位存在准确率不足的问题。为提高多重干扰下的配电网故障定位准确率,文中提出一种基于广义S变换和TT变换融合的新型故障定位方法。该方法利用广义S变换在低频域的优良时频分辨能力提取低频暂态能量,利用TT变换在高频域的优良时频分辨能力提取高频暂态能量;再由故障点上下游的低频与高频暂态能量比值差异性确定故障位置。多重干扰下的故障定位试验对比分析结果表明,所提方法具有优良的定位准确率和抗干扰能力。
The small current grounding distribution system has the inherent defect of weak fault characteristics when single phase grounding fault occurs,and the fault characteristics are also subject to interference from external factors such as high resistance grounding,three⁃phase asymmetry and noise,making the accuracy of single⁃phase to ground fault location in distribution networks insufficient.A new fault location method based on the fusion of generalized S transform and TT transform is proposed to improve the fault location accuracy of distribution network under multiple interferences.In this method,the excellent time frequency resolution of the generalized S transform in the low frequency domain is used to extract low frequency transient energy,and the excellent time frequency resolution of the TT transform in the high frequency domain is used to extract high frequency transient energy.The fault location is determined based on the difference between the low frequency and high frequency transient energy ratios upstream and downstream of the fault point.The comparative analysis of fault location experiments under multiple interferences shows that the proposed method has excellent location accuracy and anti⁃interference ability.
作者
安广培
陈强
AN Guangpei;CHEN Qiang(State Grid Bengbu Electric Power Supply Company,Bengbu 233000,China;School of Electrical Engineering and Automation,Hefei University of Technology,Anhui 230009,China)
出处
《现代电子技术》
2023年第10期100-104,共5页
Modern Electronics Technique
关键词
配电网
接地故障
定位准确率
广义S变换
TT变换
暂态能量
差异性
distribution network
grouding fault
location accurcy
generalized S transform
TT transform
transient energy
difference
