构网型风电机组的惯量阻尼特性分析

Analysis of inertia damping characteristics of GFM wind turbines

构网型变流器具有较好的惯量阻尼特性,目前已经成为新能源方面的研究焦点。为此,首先研究构网型风电变流器的阻尼特性,从阻抗的角度分析其对外等效特性,并利用伯德判据分析其在并网时的稳定性;其次从惯量的角度研究构网型风电变流器对电网的频率支撑特性,通过仿真分析,对比构网型风电变流器与跟网型风电变流器在电网频率变化及风机侧功率变化时的支撑能力。研究结果表明:构网型风电变流器对外阻抗特性呈阻感特性,并网稳定性较好;构网型风电变流器在电网故障时能够提供一定的功率支撑,等效增加了系统的惯量,并网特性较好。

Grid-forming(GFM)converters,known for their superior inertia damping characteristics,have emerged as a center research focus in the renewable energy sector.As a result,the damping characteristics of GFM wind power converters are first examined.The analysis centers on their equivalent external characteristics from an imped⁃ance standpoint,and the Bode stability criterion is utilized to study their stability during grid connection.Subse⁃quently,the frequency support characteristics of GFM wind power converters are examined in terms of inertia.A comparative investigation is undertaken via simulation analysis to gauge the supportive capability of GFM and gridfollowing(GFL)wind power converters during alterations in grid frequency and power fluctuation on the wind tur⁃bine side.The findings reveal that the external impedance characteristics of GFM wind power converters not only dis⁃play inductive properties but also maintain commendable stability throughout grid integration.In response to a grid malfunction,GFM wind power converters can furnish a significant measure of power support,equating to a rise in system inertia,thereby indicating favorable grid integration characteristics.