Patent ID: 9172248
Filing Date: 2015-10-27
Classification: H02J,Y02E

Abstract:
1. A cascaded converter station used in cascaded multi-terminal HVDC power transmission, comprising a low-voltage end converter station and a high-voltage end converter station, wherein, the low-voltage end converter station has a first positive side and a first negative side, each of the first positive side and the first negative side comprising: wherein the high-voltage end converter station is connected in series to the low-voltage end converter station through a middle-voltage DC power transmission line, and is connected to a high-voltage DC power transmission line, wherein the high-voltage end converter station comprises a second positive side and a second negative side, each of the second positive side and the second negative side comprising: wherein a grounding line coupled to a grounding electrode and a metal return line coupled between a positive line and a negative line are provided in the low-voltage end converter station.