风特性及尾流效应对双馈感应电机低电压穿越能力的影响

摘要

双馈异步风电机组并网低电压穿越能力普遍采用额定输入风速分析方法的精确度较低,为了使分析结果更加接近于实际工作情况,将风机之间的尾流效应以及不同风特性的影响考虑在内,建立风特性模型、风电场并网模型,仿真并分析了电网发生故障后双馈风机的低电压穿越能力并得到结论:幅值相同的渐变风、随机风、阵风分别作用于风电场,对有功功率输出的影响分别为最大、最小、振荡最剧烈.三者对无功功率、变换器直流环节电压的影响十分接近;尾流效应降低了下游风机的有功输出能力,但对整个风场来说提高了低电压穿越、无功补偿能力,并且减小了变换器直流环节电压的振荡.%In view of the doubly-fed induction wind turbines grid was generally used the low voltage ride through ability with rated input wind speed analysis method,leaded to lower precision,in order to make the results more close to the actual working condition,take wake effect between the wind turbine and the influence of different wind characteristics into account,set up the wind feature model,wind power grid model,the simulation analysis of the doubly fed induction generator after a fault happens in low voltage ride through ability and concluded that the amplitude of the same gradient wind、random wind、gust respectively to the wind farm,the effect of active power output respectively maximum、minimum、oscillation was the most severe.The three characteristics of the wind on the influence of reactive power and converter DC link voltage were very close.Wake effect reduced the downstream active power output capacity of the wind turbine,but for the entire wind farm could improve the low voltage ride through,reactive power compensation capacity,and reduced the converter DC link voltage oscillation.