APPARATUS FOR FILTERING HARMONICS IN RAILWAY CONTACT LINES AND METHOD

摘要

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.

主权项

1. An apparatus for filtering harmonics in a power transmitting contact line of a railway, the apparatus comprising:
a multilevel converter having one single phase leg, the phase leg comprising switching cells, each switching cell comprising semiconductor switches arranged to selectively provide a connection to a corresponding energy storage element, wherein the multilevel converter includes a controller provided to control the switching of each switching cell, wherein the phase leg is configured in two parallel branches of cascaded switching cells, the branches being interconnected in a closed circuit, and the controller is provided to monitor the content of harmonics in the contact line, and is adapted to filter the monitored harmonics by adapting the switching of the switching cells to absorb the harmonics.