低压系统多层级短路故障早期检测辨识研究  

Research on early detection of short-circuit fault in multi-level low voltage system

作　　者：吴晓梅[1] 缪希仁[1] 

机构地区：[1]福州大学电气工程与自动化学院,福建福州350108

出　　处：《电工电能新技术》2015年第9期38-43,共6页Advanced Technology of Electrical Engineering and Energy

基　　金：国家自然科学基金资助项目(51377023);福建省高校产学合作科技重大项目(2011H6013)

摘　　要：从实现低压系统多层级短路故障全范围选择性协调保护技术出发,分析短路故障早期检测的必要性及其应用要求,提出全相角短路电流小波包细节分解的早期故障检测方法,建立低压系统多层级三相短路故障实型仿真模型,解决现有方法存在个别故障初相角区间无法有效识别的问题。其次,针对负载启动与短路故障状态电流信号奇异性,在故障后0.1ms仿真实现全相角短路故障早期快速检测及有效的状态辨识;最后,通过分析短路故障相关支路的早期检测特性,提出实现短路故障支路准确判定的早期检测辨识机理。本文研究为低压系统多层级全范围的新型短路故障选择性协调保护奠定了理论基础。Based on the necessity and research status, an early detection method for short-circuit fault is proposed by a detail component of wavelet packet decomposition so as to fulfill the requirement of the full range selective and coordinative protection in a multi-level low voltage system. A three phase short-circuit fault model is established to verify the validity of above method with full range of phase angle in a low voltage system, which overcomes the limits of wavelet transform in robustness of individual initial angle region in short-circuit fault early detection. Secondly, according to the current singularity for load starting processing and short-circuit fault, the start and fault are identified agilely by early detection in full range angle after short-circuit fault O. l ms. Finally, by analyzing the early detection characteristics of relevant branches for fault point, an early detection identification mechanism for accurate pinpointing of short-circuit fault branch is expounded. The research of this paper lays a theoretical foundation for a novel short-circuit fault selective and coordinative protection in a multi-level low voltage system.

关 键 词：低压系统 短路故障 多层级选择性保护 早期检测 小波包分解 

分 类 号：TM713[电气工程—电力系统及自动化]