Patent ID: 9647529
Date: 2017-05-09
CPC Classifications: H02M

Claim:
1. A device for transferring electrical power between an AC voltage network and a DC voltage network in a high-voltage range, the device comprising: a plurality of phase modules each having two shared DC voltage terminals and each having a separate AC voltage terminal; a respective phase module branch extending between each said DC voltage terminal and each said AC voltage terminal, said phase module branch including a series circuit with two-pole sub-modules each having two sub-module connection terminals; each said two-pole sub-module having an energy storage device and a power semiconductor circuit connected in parallel with said energy storage device, and wherein, depending on a control of said power semiconductor circuit either the voltage dropping across said energy storage device or a zero voltage is generated at said two sub-module connection terminals; a converter transformer having a primary side connected or connectable to an AC voltage network, said converter transformer having a secondary side connected or connectable to each said AC voltage terminal, and a converter neutral point on said secondary side; and two surge arresters respectively connected between one of said DC voltage terminals or a potential point having a comparable potential and said converter neutral point.