产地:xhzdh0009 |
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交直交变频器又可以分为电压型和电流型两种,由于控制方法和硬件设计等各种因素,电压型逆变器应用比较多传统的电流型交直交变频器采用自然换流的晶闸管作为功率开关,其直流侧电感比较昂贵,而且应用于双馈调速中,在过同步速时需要换流电路,在低转差频率的条件下性能也比较差,在双馈异步风力发电中应用的不多。采用电压型交直交变频器这种整流变频装置具有结构简单、谐波含量少、定转子功率因数可调等优异特点,可以明显地改善双馈发电机的运行状态和输出电能质量,并且该结构通过直流母线侧电容完全实现了网侧和转子侧的分离。电压型交直交变频器的双馈发电机定子磁场定向矢量控制系统,实现了基于风机功率点跟踪的发电机有功和无功的解耦控制,是目前变速恒频风力发电的一个代表方向
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