双馈风力发电机组的间谐波问题分析

Analysis of inter-harmonic produced by doubly-fed wind power generator

分析了双馈风力发电机组的间谐波产生原理和DFIG间谐波的特点,然后对目前电力系统IEC框架下间谐波检测和存在的问题进行研究。文章采用高斯窗调节因子的S变换来检测变速风力发电机组的间谐波,并与IEC标准中的检测方法进行了对比,通过分析风电机组现场运行数据,说明DFIG输出的间谐波具有明显的特征频次,而这些特征采用已有的标准无法体现出来。

The inter-harmonic generation principle and characteristics of doubly fed wind power generator are analyzed in this paper. Then the power system inter-harmonics detection based on IEC framework and its problem are analyzed. An S-transform with adjustable Gauss window is used to detect the inter-harmonic distribution of variable speed wind turbine. And the results are compared with that by the IEC method. The analysis of running data of wind turbine site indicates that the frequency of inter-harmonics is dominant which can＇t be reflected accurately by the existing IEC standard.