公开(公告)号：WO2016070378A1

公开(公告)日：2016-05-12

申请号：PCT/CN2014/090455

申请日：2014-11-06

Applicant: ABB TECHNOLOGY LTD ,  XING, Zhongwei ,  RUAN, Xinbo ,  YOU, Hongcheng ,  YANG, Xiaobo ,  YAO, Dawei ,  YUAN, Chunming

Inventor： XING, Zhongwei ,  RUAN, Xinbo ,  YOU, Hongcheng ,  YANG, Xiaobo ,  YAO, Dawei ,  YUAN, Chunming

IPC: H02M3/28

CPC classification number: H02M3/33584 ,  H02M2007/4835

Abstract: A method and controller for controlling capacitor voltage balancing in a modular direct-current to direct-current (DC/DC) converter. The method comprises in each of sub-process of a voltage transitional process of a square wave for an arm: S701: identifying candidate sub-modules in a predetermined status from sub-modules in the arm; S702: obtaining capacitor voltages of the candidate sub-modules; S703: selecting at least one target sub-module from the candidate sub-modules based on the obtained capacitor voltages; and S704: generating a control signal to the at least one target sub-module in the arm so that a voltage across the arm changes gradually in the voltage transitional process. Using the above method, well-balanced capacitor voltages can be provided, which could provide a square waveform with a voltage changing gradually in the voltage transitional process at corresponding arm and at the same time meet requirements on the arm current by a soft switching. Therefore, the switching loss can be reduced even at a higher switching frequency and thus the system efficiency can be improved.

Abstract translation: 用于控制模块化直流到直流（DC / DC）转换器中的电容器电压平衡的方法和控制器。 该方法包括在臂的方波的电压过渡过程的每个子过程中：S701：从臂中的子模块识别处于预定状态的候选子模块; S702：获得候选子模块的电容器电压; S703：基于获得的电容器电压从候选子模块中选择至少一个目标子模块; 和S704：向臂中的至少一个目标子模块生成控制信号，使得跨越臂的电压在电压过渡过程中逐渐变化。 使用上述方法，可以提供平衡良好的电容器电压，这可以提供在相应臂的电压过渡过程中电压逐渐变化的方波，同时通过软开关满足臂电流的要求。 因此，即使在较高的开关频率下也可以降低开关损耗，从而可以提高系统效率。