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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 full-bridge 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.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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