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During the operation of high-voltage DC power grid，due to factors such as load characteristics and voltage fluctuations，the instantaneous power characteristics such as capacitor current and harmonics are more complex，which increases the difficulty of identifying faults in the power grid system. Therefore，a bipolar short circuit fault identification technology for high-voltage DC power grids considering instantaneous power characteristics was proposed. By establishing a topology model of the high-voltage DC power grid，the bipolar short circuit fault of the high-voltage DC power grid was anlyzed. Based on the instantaneous power charac-teristics of the endpoints of the high-voltage DC power grid，the area where the bipolar short circuit fault occurs was determined. Using the maximum value positioning method of dual terminal fault current to obtain bipolar short circuit fault location，the fault identification of bipolar short circuit in high-voltage DC power grid was completed. The experimental results show that the proposed method has high accuracy in locating and identifying bipolar short circuit faults in high-voltage DC power grids，and the efficiency of fault identification is improved.
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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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