应用于双馈风力发电机的LCL型滤波器

LCL filters applied in doubly fed induction generator

根据对LCL型滤波器元件参数的约束条件的分析,提出在双馈风力发电机(DFIG)系统的网侧变换器(GSC)侧连接星形LCL型滤波器,在转子侧变换器(RSC)侧连接三角形LCL型滤波器,并以2.5 MW的DFIG为例,给出了各滤波器的参数。仿真结果表明,采用了提出的LCL型滤波器设计方法后,DFIG系统的GSC侧总谐波畸变率(THD)下降为1.70%,RSC侧总谐波畸变率下降为1.64%,滤波效果远优于L型滤波器。

The constraints of LCL filter parameters are analyzed and it is proposed to connect a star-type LCL filter to the GSC（Grid-Side Converter） of DFIG（Doubly Fed Induction Generator） system while a delta-type LCL filter to its RSC（Rotor-Side Converter）. The parameters of both filters for a 2.5 MW DFIG are given as an example. Simulative results show that,the THD（Total Harmonic Distortion） at the GSC side of DFIG system with the proposed LCL filters is reduced to 1.70% while that at its RSC side is reduced to 1.64%,which are much lower than those of DFIG system with L filters.