基于SSTDR的光伏系统直流母线电弧故障在线检测与定位
On-line Detection and Location of DC Bus Arc Faults in PV Systems Based on SSTDR
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摘要: 针对光伏系统中直流母线上发生电弧故障危害重大且检测和定位困难的问题,提出一种基于传输线等效分布参数模型的扩展频谱时域反射法,对电弧故障进行在线检测和定位。该文研究直流母线发生故障电弧的原因和类型,对拓展频谱和时域反射进行理论分析,利用Simulink仿真平台建立直流母线电弧故障模型进行仿真,基于FPGA技术搭建实验平台,验证了理论正确性与可行性。实验结果表明,该方法能够实现对光伏系统直流母线电弧故障在线检测和定位,具有定位精度高、实时性好等优点。Abstract: Aiming at the problem that arc faults occur on DC buses in photovoltaic systems are harmful and difficult to be detected and located, a spread spectrum time domain reflectometry method based on the equivalent distributed parameter model of transmission lines was proposed to detect and locate arc faults online. In this paper, the causes and types of DC bus arc faults were studied. The extended spectrum and time domain reflection were analyzed theoretically. The DC bus arc fault model was simulated by using Simulink simulation platform. An experimental platform based on FPGA technology was built to verify the correctness and feasibility of the theory. The experimental results show that this method can realize on-line detection and location of DC bus arc faults in photovoltaic systems, and has the advantages of high positioning accuracy and good real-time performances.
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