Full
Outline
During the black start process of a renewable energy station, traditional grid-forming converters usually output symmetrical three-phase currents. At this time, the asymmetrical loads within the station will lead to unbalanced three-phase voltages, thereby triggering power fluctuations between the inverter and the grid, increasing the risk of black start failure. In order to achieve voltage balance during the black start process, the three stages of the black start of a renewable energy station based on the grid-forming energy storage converter are analyzed. By combining the connection mode of the asymmetrical load, it studies the mechanism of voltage unbalance during the zero-to-rise voltage stage considering the constraints of the three-phase three-wire topology. Aiming at the grid-forming characteristics of the energy storage converter, a black start voltage balance strategy based on model predictive control is proposed. This method does not require positive- and negative-sequence separation control, and can effectively suppress the negative sequence voltage generated by the asymmetrical load, and reduce the voltage unbalance factor. The hardware-in-the-loop experiment verifies the effectiveness of the strategy proposed, which can provide a new technical reference for the black start of renewable energy stations.
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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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