针对大型光伏阵列中不同位置的直流串联电弧或并联电弧故障,基于电弧静态伏安特性和光伏阵列输出I-V特性,分析电弧的稳态工作点和电阻特性,进而定性推断电弧电流信号噪声的强度关系。结合实验测试,从电弧电流频域分量大小的角度,明确了光伏阵列不同位置的同类型电弧故障检测的难易程度,为大型光伏电站中各种位置的电弧故障有效检测提供了参考。
Abstract
In order to compare the noise intensity of DC arc faults in different locations in the photovoltaic array, the steady operating points and resistance characteristics of series arcs and parallel arcs were analyzed separately based on the static volt-ampere characteristics of DC arcs and the output characteristics of the photovoltaic system. From the perspective of DC arc noise in frequency domain, the degree of difficulty to detect the series arcs or parallel arcs with different locations in photovoltaic array were different, which were also confirmed by experimental tests. The results will provide a reference for detecting DC arc faults in large photovoltaic power plants.
关键词
光伏电站 /
直流电弧故障 /
电弧噪声强度 /
电弧故障检测
Key words
photovoltaic power station /
DC arc fault /
arc noise intensity /
arc fault detection
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