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Transient stability mechanism of DFIG wind farm and grid-connected power system

机译:DFIG风电场和并网电力系统的暂态稳定机制

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In China, the wind farm is usually with large capacity, centralized, multipoint into the grid and far away from the loading area, which lead to the link between the wind farm and power grid is weak, and the impact of wind power on power system extends from local area to the system stability. Meanwhile, the structure and characteristics of wind turbine generator (WTG) are different from those of conventional generators. A lot of dynamical phenomena can not be explained by the existing theory. So it is very urgent to study the impact of large-scale wind farm on power system transient stability. At present, power system transient stability including large-scale wind farm is investigated generally by building wind farm model, simulating and drawing conclusion. But the stability theory of power system including WTG is still insufficient. In the paper, firstly, from the view of torque balance, the operating-point and variation of rotor speed are used to analyze the transient stability of wind farm consisted of Double-Fed Induction Generator (DFIG). Secondly, the active power and mechanical power of wind farm is equivalently converted to the mechanical power of synchronous generator, then the extended equal area criterion of power system including wind farm is derived. Thirdly, the mechanism of wind farm effect on power system transient stability is analyzed, and the impact of wind turbine control characteristics on the equivalent mechanical power of synchronous generator is also considered. Finally, a modified CIGRE B4–39 test system is adopted to verify the correctness of the proposed method.
机译:在中国,风电场通常容量大,集中,多点进入电网并远离负荷区,这导致风电场与电网之间的联系薄弱,风电对电力系统的影响从局部扩展到系统稳定性。同时,风力涡轮发电机(WTG)的结构和特性与常规发电机不同。现有理论无法解释许多动力学现象。因此,研究大型风电场对电力系统暂态稳定的影响显得尤为迫切。目前,通过建立风电场模型,仿真并得出结论,对包括大型风电场在内的电力系统暂态稳定进行了总体研究。但是包括WTG在内的电力系统的稳定性理论仍然不足。在本文中,首先,从转矩平衡的角度,利用工作点和转子速度的变化来分析由双馈感应发电机(DFIG)组成的风电场的暂态稳定性。其次,将风电场的有功功率和机械功率等效转换为同步发电机的机械功率,然后推导包括风电场在内的电力系统的扩展等面积判据。第三,分析了风电场对电力系统暂态稳定的影响机理,并考虑了风力发电机控制特性对同步发电机等效机械功率的影响。最后,采用改进的CIGRE B4-39测试系统来验证所提出方法的正确性。

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