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Outline
Due to the current-magnitude limit, controlled phase angle, and absence of zero-sequence current of converters, fault-location errors occur when two-phase short-circuit faults happen in offshore wind-farm collector cables. This paper analyzes the composite-sequence network under such faults and exploits the capability of both the VSC-HVDC link and the wind-turbine converters to suppress negative-sequence current during the fault. By using the locally measured negative-sequence voltage, the positive-sequence voltage at the fault point is computed on-line, a fault-distance equation is established, and the fault position is solved in real time. The proposed on-line algorithm remains accurate for large and non-resistive fault resistances and is immune to the reactive-power support strategy of the offshore wind farm, thus enhancing the safe and stable operation of offshore wind power systems.
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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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