公开(公告)号：US20140002048A1

公开(公告)日：2014-01-02

申请号：US14005266

申请日：2011-10-31

申请人： Hui Pang ,  Zhiyuan He ,  Yan Zhao ,  Chunming Yuan ,  Dong Liu ,  Wenjin Li

发明人： Hui Pang ,  Zhiyuan He ,  Yan Zhao ,  Chunming Yuan ,  Dong Liu ,  Wenjin Li

IPC分类号： H02M11/00

CPC分类号： H02M11/00 ,  H02M7/483 ,  H02M2001/0003 ,  H02M2007/4835

摘要： The present invention relates to Voltage balancing control method for modular multilevel converter is characterized that, it includes some steps as follows:1) Determine the leg current direction is positive or negative;2) Find out the highest sub module on output state whose capacitor voltage amplitude is the maximum, and find out that on bypass state whose capacitor voltage amplitude is the minimum;3) Determine whether the sub module inputs or bypass operation; this method avoided switching arbitrariness of the sub module, and decreased the switching frequency of the sub module. The capacitor voltage balancing control of the sub module proposed by the method is more suitable to be applied in the field of high voltage and large capacity converter that has large numbers of sub modules.

摘要翻译： 本发明涉及模块化多电平转换器的电压平衡控制方法，其特征在于包括以下步骤：1）确定支路电流方向为正或负; 2）找出电容器电压幅度最大的输出状态下的最高子模块，找出电容电压幅值最小的旁路状态; 3）确定子模块是否输入或旁路操作; 该方法避免了子模块的任意切换，降低了子模块的切换频率。 该方法提出的子模块的电容电压平衡控制更适用于具有大量子模块的高压大容量转换器领域。