低压系统多层级短路电流早期检测与预测

发布时间：2018-04-17 20:02

本文选题：低压系统 + 短路故障　；参考：《电工技术学报》2014年11期

【摘要】：从电源侧向终端侧的全范围延伸是当前选择性保护的技术方向。针对现阶段低压系统短路故障选择性保护的局限性,提出多层级全范围选择性协调保护系统技术概念,阐述实现新型全选择性协调保护的系统架构及其关键技术。在建立低压系统多层级单相短路故障实型实验系统及其仿真模型的基础上,分析全相角范围短路故障电流波形,阐述小波变换实现短路故障早期检测原理及其技术实现,并引入极端学习机研究短路故障早期辨识的电流峰值预测方法。仿真与实验验证了短路电流早期检测及其峰值预测的有效性,为低压系统多层级短路故障全选择性协调保护奠定理论基础。
[Abstract]:Extending the whole range from the power side to the terminal side is the current technical direction of selective protection.In view of the limitation of selective protection for short-circuit fault in low-voltage system at present, the concept of multi-level all-range selective coordinated protection system is put forward, and the system architecture and key technology to realize the new type of fully selective coordinated protection are described.On the basis of establishing the real experiment system and its simulation model of multi-level single-phase short-circuit fault in low-voltage system, the waveform of short-circuit fault current in the whole phase angle range is analyzed, and the principle and technical realization of early detection of short-circuit fault based on wavelet transform are expounded.An extreme learning machine is introduced to study the peak current prediction method for early identification of short circuit faults.The effectiveness of early detection and peak prediction of short-circuit current is verified by simulation and experiment, which lays a theoretical foundation for all-selective coordinated protection of multi-level short-circuit fault in low-voltage system.
【作者单位】：福州大学电气工程与自动化学院;
【基金】：国家自然科学基金(51377023) 福建省高校产学合作科技重大项目(2011H6013)资助项目
【分类号】：TM713

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