基于Hausdorff距离的光伏漏电流监测方法

A PV Leakage Current Monitoring Method Based on Hausdorff Distance

与带有隔离变压器的大型光伏系统相比,分布式光伏的功率与体积较小,且为了提高工作效率,在设计时多采用非隔离型逆变器,但也因此产生了会危害配网系统安全的光伏漏电流。以单相全桥结构的光伏系统为例,详细分析了光伏漏电流的产生机理,随后分析了光伏漏电流进入配电网后的波形特征,并在此基础上提出了一种基于Hausdorff距离的光伏漏电流监测方法,简单高效地解决了光伏漏电流监测与保护困难的问题。最后对提出的方法进行仿真分析,验证了所提方法的可行性。

Compared with large photovoltaic systems with isolation transformers,distributed photovoltaic systems have small power and volume.In order to improve efficiency,non-insulated inverters are often used in design,but photovoltaic leakage current endangering system safety is also generated.Taking the single-phase fullbridge photovoltaic system as an example,the generation mechanism of photovoltaic leakage current was analyzed in detail through in-depth discussion of the problem of photovoltaic leakage current.Subsequently,the waveform characteristics of the photovoltaic leakage current entering the distribution network were analyzed,and a photovoltaic leakage current monitoring method based on Hausdorff distance was proposed,which simply and efficiently solved the problem of photovoltaic leakage current monitoring and protection.Finally,the feasibility of the proposed method was verified by simulation analysis.