公开(公告)号：US09728962B2

公开(公告)日：2017-08-08

申请号：US14443284

申请日：2012-11-15

Applicant: ABB Technology Ltd

Inventor： Jean-Philippe Hasler ,  Mauro Monge

IPC: H02M7/48 ,  H02J3/01 ,  H02M1/12 ,  H02M7/483 ,  H02M7/493

CPC classification number: H02J3/01 ,  H02M1/12 ,  H02M7/483 ,  H02M7/493 ,  H02M2007/4835

Abstract: An apparatus and a method for filtering harmonics in a power transmission contact line of a railway system includes a multilevel converter multilevel converter having one single phase leg, which phase leg comprises switching cells, each switching cell comprises semi-conductor switches arranged to selectively provide a connection to a corresponding energy storage element. The multilevel converter also includes a controller provided to control the switching of each switching cell, and wherein the phase leg is configured in two parallel branches of cascaded switching cells, which branches is interconnected in a closed circuit. The controller is provided to monitor the content of harmonics in the contact line, and is adapted to filter the monitored harmonics by means of adapting the switching of the switching cells to absorb the harmonics.