公开(公告)号：US09806599B2

公开(公告)日：2017-10-31

申请号：US15182746

申请日：2016-06-15

Applicant: GE Energy Power Conversion Technology Ltd

Inventor： Martin Geske ,  Joerg Janning ,  Thomas Brueckner ,  Roland Jakob

IPC: H02M7/483 ,  H02M7/44 ,  H02M7/04 ,  H02M1/32 ,  H02H9/04 ,  H02H7/12 ,  H01T15/00 ,  H01T1/14 ,  H01T2/02

CPC classification number: H02M1/32 ,  H01T1/14 ,  H01T2/02 ,  H01T15/00 ,  H02H7/12 ,  H02H9/041 ,  H02M7/04 ,  H02M7/44 ,  H02M7/483 ,  H02M2001/325 ,  H02M2007/4835

Abstract: A short-circuit device and a protection method for a submodule for a power converter are disclosed. The submodule includes a bridge circuit having at least one power semiconductor branch extending between a first and a second DC voltage node and at least one controllable power semiconductor switch disposed therein to which a freewheeling diode is connected in anti-parallel, and a capacitor connected in parallel to the bridge circuit. The short-circuit device has at least one selected of the freewheeling diodes anti-parallel to the power semiconductor switches of the bridge circuit, wherein the at least one selected freewheeling diode is manufactured in press pack design and rated such that, when a fault occurs in the submodule, the at least one selected freewheeling diode breaks down due to the fault conditions and provides a durable, stable, low-impedance short circuit path between a first and a second AC voltage connection of the submodule.

公开(公告)号：US11108338B2

公开(公告)日：2021-08-31

申请号：US16078864

申请日：2017-02-24

Applicant: GE Energy Power Conversion Technology Ltd

Inventor： Martin Geske ,  Joerg Janning

IPC: H02M7/483 ,  H02M1/32 ,  H02M1/00

Abstract: A dual submodule is created for a modular multilevel converter, whereby the dual submodule has two interconnected submodules, whereby each submodule has an asymmetrical half-bridge circuit with two parallel bridge branches, which are connected between a first and a second terminal connection of the submodule, whereby each bridge branch is formed from a series circuit of a power semiconductor switch, and a diode, whereby the power semiconductor switch is allocated to an antiparallel free-wheeling diode, and has a capacitor, which is connected in parallel with the asymmetrical half-bridge circuit between the first and the second terminal connections of the module. The submodules are connected to each other via their AC terminals to form the dual submodule. Further, a modular multilevel converter is created, comprising a number of such dual submodules in each of its converter branches.