通过零序电流注入降低三角形连接固态变压器桥臂电流应力

The medium voltage stage of solid state transformer (SST), as a grid-connected converter, is required to generate a negative-sequence (NS) current under certain conditions. Unfortunately, this NS current increases the arm current stress, which limits the operating range of the SST. This article proposes the concept of using a zero-sequence (ZS) current to reduce such a current stress in △-connecte...