公开(公告)号：EP3186878A1

公开(公告)日：2017-07-05

申请号：EP15754215.0

申请日：2015-08-26

Applicant: ABB Technology Oy

Inventor： RAUCHENSTEIN, Juerg ,  DAMAZIO-COELHO, Kefas ,  LUESCHER, Matthias

IPC: H02M7/487 ,  H02M7/483

CPC classification number: H02M5/44 ,  H02M7/483 ,  H02M7/487 ,  H02M7/49 ,  H02M2007/4835

Abstract: A converter system comprises two phase modules, each phase module comprising a first converter leg and a second converter leg interconnected with a DC link, and a charging transformer for charging the DC link. The DC link comprises two capacitors connected in series between a positive point, a middle point and a negative point, each converter leg adapted for interconnecting an output with the positive point, the middle point or the negative point of the DC link. The phase modules are connected in series via outputs of the converter legs, such that a second converter leg of a lower phase module is connected with a first converter leg of a higher phase module. The charging transformer is connected to the middle point of the DC link of a highest phase module, which provides a phase output of the converter system with an output of a second converter leg. The converter system includes two converter phases, each converter phase comprising at least two series connected phase modules. At a star point of the converter phases the converter phases are star-connected via outputs of first converter legs of lowest converter modules, which are series connected with higher converter modules, whereby a module side start point of the charging transformer is connected or is not connected with the star point of the converter phases.

Abstract translation: 一种变换器系统包括两个相模块，每个相模块包括与DC链路互连的第一变换器支路和第二变换器支路以及用于对DC链路充电的充电变压器。 DC链路包括串联连接在正极点，中间点和负极点之间的两个电容器，每个变换器支路适于将输出与DC链路的正极点，中间点或负极点互连。 相模块通过转换器支路的输出串联连接，使得下相模块的第二转换器支路与上相模块的第一转换器支路连接。 充电变压器连接到最高相位模块的直流链路的中点，该最高相位模块提供具有第二转换器支路的输出的转换器系统的相位输出。 转换器系统包括两个转换器相位，每个转换器相位包括至少两个串联连接的相位模块。 在转换器相的星形点处，转换器相通过最低转换器模块的第一转换器支路的输出端星形连接，所述最低转换器模块与较高转换器模块串联连接，由此充电变压器的模块侧起始点连接或不连接 与转换器相的星形点连接。