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The transient power angle stability and voltage stability issues of new energy grid connected systems like wind power are combined, and suffer the risk of short circuit current level. Current research mostly focuses on improving the stability based on single factor, without considering the multiple factors to develop optimization methods for wind turbine control parameters. To solve the issue, an optimization method for key parameters of wind turbine short circuit current and reactive power support is proposed in this paper considering transient power angle stability. Firstly, based on the simplified model of windthermal combined system, the mechanism of power angle stability problem and the influence of active power output of the wind turbine on power angle stability are analyzed. Then, the analytical expression for the shortcircuit current of the directdriven wind turbine is derived, and the key factors that influence the levels of active and reactive currents are analyzed. Finally, the influence of key parameters of short circuit current on the reactive power voltage support capacity of wind turbines are studied by simulation, based on which the optimization principles and method for key parameters of wind turbine short circuit current and reactive power support considering transient power angle stability are developed. The simulation analysis results based on actual power grids show that the proposed method can improve the reactive voltage support capacity of wind turbines while ensuring transient power angle stability margin and short circuit current level.
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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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