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As a new multilevel converter topology, active NPC (ANPC) converter is very competitive for utility interface of large wind turbines. To meet the harmonics limit according to standards, such as IEEE, VEDW and IEC, passive grid filter is usually required, which is bulky, heavy, and may cause parasitic resonance in the mains. This paper proposes a new 9-level ANPC converter topology to achieve filterless...
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