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大规模变速风电机组并网运行引起的风电场安全问题应给予更多关注。以变速风力机整体为研究对象,分析了风力机稳定性与运行状态、控制策略、发电功率以及风速的关系。针对定功率控制过程中出现的失稳现象,建立了定功率控制过程中的小信号模型,通过研究平衡点的稳定性,近似给出了风力机的稳定运行边界。从物理概念分析了平衡点的稳定性,阐述了桨距角和风速变化引起的风力机失稳过程,并提出了风力机稳定性的判别方法。
Wind farm safety issues caused by grid-connected operation of large-scale variable speed wind turbines should pay more attention. Taking variable speed wind turbine as a whole research object, the relationship between wind turbine stability and operation status, control strategy, power generation and wind speed is analyzed. Aiming at the instability phenomenon occurred in the process of constant power control, a small signal model in the process of constant power control is established. By studying the stability of the equilibrium point, the stable operating boundary of the wind turbine is given. The stability of the equilibrium point is analyzed from the physical concept. The instability process of the wind turbine caused by the change of pitch angle and wind speed is expounded, and the method of discriminating the stability of the wind turbine is proposed.