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针对兆瓦级直驱风力发电系统中网侧LCL滤波器的设计展开研究。考虑到实际系统中并网变压器的漏感,在节省一个大电感的情况下设计了适合兆瓦级直驱系统的LCL滤波器。利用Matlab/Simulink7·1环境设计了精确的网侧变流器的仿真模型,对比了在SPWM和SVPWM两种不同调制算法下系统的运行性能,指出了两种调制方法对系统的不同影响,同时对比分析了L滤波器和LCL滤波器滤波效果。
Aiming at the design of LCL filter on the grid side in MW direct drive wind power generation system, Considering the leakage inductance of the grid-connected transformer in the actual system, an LCL filter suitable for the megawatt direct drive system is designed while saving a large inductance. The simulation model of grid-side converter is designed by Matlab / Simulink 7.1 environment. The performance of the system under two different modulation algorithms of SPWM and SVPWM is compared. The different influences of the two modulation methods on the system are pointed out. At the same time The filtering effects of L filter and LCL filter are compared and analyzed.