Patent ID: 11876367
Assignee: ABB SCHWEIZ AG
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A modular direct current (DC) interconnection device, comprising:
at least three operation branches each including a mechanical switch, an auxiliary breaker serially coupled with the mechanical switch, and a first terminal coupled to a common node and configured to transmit DC current in a normal mode;
at least one transient branch including a main breaker and an energy absorption device coupled in parallel to the main breaker, the at least one transient branch coupled between second terminals of different ones of the at least three operation branches and configured to provide a transient DC current path in a fault clearance mode; and
a local controller coupled to the at least three operation branches and the at least one transient branch and configured to control operation of the at least three operation branches and the at least one transient branch;
wherein the local controller is further configured to:
receive fault clearance information, from a local controller of another modular DC interconnection device (MDCID), a global controller, or a sensor for sensing a fault in a modular interconnection device (MID) or the MDCID and determine operation and transient branches associated with fault clearance operation in the fault clearance mode based on the received fault clearance information,
turn on the main breaker in the determined transient branch to provide the transient DC current path in the fault clearance mode between the two second terminals of the determined operation branch and another operation branch of the at least three operation branches,
turn off the mechanical switch and the auxiliary breaker in the determined operation branch in response to turning on main breaker turn off the main breaker in the determined transient branch in response to completing a turning-off of the mechanical switch, and
cause the energy absorption device in the determined transient branch to absorb electric energy in response to turning off the main breaker.