公开(公告)号：US20200007065A1

公开(公告)日：2020-01-02

申请号：US16454478

申请日：2019-06-27

申请人： Delta Electronics (Shanghai) CO., LTD

发明人： Kai CHEN ,  Wenjiang ZHAO ,  Yongqiang LANG ,  PETER MANTOVANELLI BARBOSA

IPC分类号： H02P27/04 ,  H02P1/26

摘要： A method of modulating a cascaded three-phase VFD, including: obtaining space voltage vectors according to states and output levels of switches of power units in each stage, and dividing the vectors into large vectors, medium vectors, small vectors and zero vectors according to their lengths; arranging the vectors into a vector space, and dividing the vector space into sectors, wherein each sector corresponds to a group of the large vector, the medium vector, the small vector and the zero vector; determining a sector in which a reference voltage vector is located, wherein the reference voltage vector is composed by the group of vectors; calculating action time of the vectors in the group; allocating an action order to the vectors; and generating a three-phase modulated wave signal based on the action orders and the action time.