Full
Outline
To solve the resonance problem in grid-connected offshore wind power delivered by long-distance AC submarine cables, the typical equipment models are established at first, and the resonant mechanism is analyzed by taking into account the capacitance-reactance characteristics of submarine cables. On this basis, a resonance suppression technology for offshore wind power based on high-voltage active resonance suppressor (HARS) is proposed. A two-stage transformation structure consisting of a Buck transformer and a H-bridge cascade valve bank is adopted to realize reliable grid-connection at 220 kV high-voltage level. According to the impedance reshaping theory, a resonant damping control strategy based on the feedback of resonant component of grid-side current is designed, and the feasible region analysis method for the damping coefficient and band-pass center frequency is also given. Finally, the feasibility and effectiveness of the proposed technology are verified by simulations and engineering practice.
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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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