公开(公告)号：US10122163B2

公开(公告)日：2018-11-06

申请号：US15542354

申请日：2015-01-30

Applicant: ABB Schweiz AG

Inventor： Ritwik Majumder ,  Bertil Berggren ,  Giovanni Velotto ,  Tomas Jonsson ,  Soubhik Auddy ,  Jenny Josefsson

IPC: H02H7/00 ,  H02H7/22 ,  H02J1/00 ,  H02B1/24

Abstract: The invention concerns a switchyard for interconnecting direct current power networks and a direct current power transmission system comprising such a switchyard. The switchyard comprises a number of interconnected entities comprising at least two main circuit breakers and a number of transfer switches, where each network has two connections to the switchyard, at least one via a transfer switch, each main circuit breaker has four connections in the switchyard, two at each end of the main circuit breaker and at least one via a transfer switch, and each network is joined with every other network via a corresponding path through at least one main circuit breaker as well as via a corresponding path bypassing all main circuit breakers.

公开(公告)号：US10084371B2

公开(公告)日：2018-09-25

申请号：US15750088

申请日：2015-09-21

Applicant: ABB SCHWEIZ AG

Inventor： Tomas Jonsson

IPC: H02H7/125 ,  H02M7/10 ,  H02M7/04 ,  H02M5/42 ,  H02M7/68 ,  H02M7/155 ,  H02M1/32 ,  H02M7/483 ,  H02J3/36 ,  H02M7/5387 ,  H02M7/219

CPC classification number: H02M1/32 ,  H02J3/36 ,  H02M7/219 ,  H02M7/25 ,  H02M7/483 ,  H02M7/53871 ,  H02M2007/4835 ,  Y02E60/60

Abstract: A multilevel converter includes a first and a second converter block series-connected between two DC terminals and a chopper circuit between the blocks. Each block includes a number of valve arm strings, each including an upper and a lower valve arm and a number of converter cells. A midpoint between the upper and lower arm of a string of the first block is connected to a corresponding primary AC terminal and a midpoint between the upper and lower arm of a corresponding string of the second block is connected to a corresponding secondary AC terminal. The chopper circuit comprises a power dissipating element in parallel with a circuit breaker.

公开(公告)号：US10770962B2

公开(公告)日：2020-09-08

申请号：US16071367

申请日：2016-04-08

Applicant: ABB SCHWEIZ AG

Inventor： Aneeshkumar As ,  Kalpesh Bhalodi ,  Tomas Jonsson

IPC: H02M1/08 ,  H02M3/158 ,  H02M7/162

Abstract: A converter cell includes a first terminal; a second terminal; a plurality of switching elements provided with respective gate units; an energy storage element; an clamp inductor provided to restrict a rate of change of current from the energy storage element to the switching elements; and a first energy converter provided in parallel to the clamp inductor. The first energy converter is provided to power the gate units by utilising energy from the clamp inductor when the converter cell changes state to be in a short circuit state.