公开(公告)号：US20190245351A1

公开(公告)日：2019-08-08

申请号：US16342511

申请日：2016-11-24

Applicant: KOREA ELECTRIC POWER CORPORATION

Inventor： Seong-Doo LEE ,  Soon-Ho CHOI ,  Chur-Hee LEE

IPC: H02J3/36 ,  H02M5/45 ,  G01R21/00

CPC classification number: H02J3/36 ,  G01R11/52 ,  G01R21/003 ,  G01R21/133 ,  H02M1/08 ,  H02M5/45 ,  Y02E60/60

Abstract: A device for extinction angle control of a high voltage direct current (HVDC) system, includes: a converter reactive power calculator calculating a reactive power variation amount of a converter included in the HVDC system, depending on firing angle control of the converter; an alternating current (AC) system short circuit level calculator calculating a short circuit level of an AC system by applying the reactive power variation amount to a short circuit level formula of the AC system connected to the HVDC system; an extinction angle variation value calculator calculating an extinction angle variation value of the converter, corresponding to the short circuit level; and an extinction angle controller controlling an extinction angle of the converter, depending on an extinction angle control value reflecting the extinction angle variation value.

公开(公告)号：US20190081481A1

公开(公告)日：2019-03-14

申请号：US16081092

申请日：2017-02-23

Applicant: General Electric Technology GmbH

Inventor： Robin GUPTA ,  Robert WHITEHOUSE

IPC: H02J3/36 ,  H02M7/00 ,  H02M7/483

CPC classification number: H02J3/36 ,  H02J2003/365 ,  H02M7/003 ,  H02M7/2173 ,  H02M7/2176 ,  H02M7/483 ,  H02M2001/123 ,  H02M2007/4835 ,  Y02E60/60

Abstract: An electrical assembly includes a power converter having first and second DC terminals which are connectable to a DC electrical network. The power converter also includes converter limbs connected between the first and second DC terminals. Each converter limb includes an AC terminal that is connectable to a respective AC phase of a multi-phase AC electrical network. Each converter limb also includes limb portions, each connected between a corresponding AC terminal and a respective one of the first and second DC terminals. Each limb portion includes switching element(s). The electrical assembly includes a single grounding circuit having a reactor configured to provide a current path for alternating current with a high impedance to ground and a current path for direct current with a low impedance to ground. The grounding circuit is arranged so that only one of the AC phases is connected to ground via the grounding circuit.

公开(公告)号：US20190028038A1

公开(公告)日：2019-01-24

申请号：US16070157

申请日：2016-01-19

Applicant: SIEMENS AKTIENGESELLSCHAFT

Inventor： RODRIGO ALONSO ALVAREZ VALENZUELA ,  JOERG DORN ,  DOMINIK ERGIN ,  HERBERT GAMBACH ,  WOLFGANG GOBLIRSCH ,  JOERG LANG ,  MARTIN PIESCHEL ,  FRANK SCHREMMER

IPC: H02M7/483 ,  H02M7/5387 ,  H04B10/50

CPC classification number: H02M7/483 ,  H02J3/36 ,  H02M1/084 ,  H02M7/5387 ,  H02M2001/0003 ,  H02M2007/4835 ,  H04B10/50 ,  Y02E60/60

Abstract: A modular multilevel converter includes a plurality of sub-modules. Each of the sub modules has at least two electronic switching elements, an electrical energy storage device, two galvanic power terminals, an optical communication input (222) and an optical communication output. A plurality of the sub-modules is connected to a series circuit by way of their communication input and communication output.

公开(公告)号：US20190028021A1

公开(公告)日：2019-01-24

申请号：US16081440

申请日：2017-03-01

Applicant: General Electric Technology GmbH

Inventor： Javier Francisco CHIVITE-ZABALZA ,  David Reginald TRAINER ,  Jonathan Christopher NICHOLLS ,  Konstantin VERSHININ ,  Ikenna Bruce EFIKA ,  Francisco Jose MORENO MUNOZ ,  John Lewis OUTRAM ,  Rajaseker Reddy GINNAREDDY

IPC: H02M1/34 ,  H02J3/36 ,  H02J7/34 ,  H02M7/797

CPC classification number: H02M1/34 ,  H02J3/36 ,  H02J7/345 ,  H02M1/32 ,  H02M7/49 ,  H02M7/797 ,  H02M2001/325 ,  H02M2001/348 ,  H02M2007/4835 ,  Y02E60/60

Abstract: Fault protection of a voltage source converter is provided. An apparatus has a chain-link circuit in series with a director switch. The chain-link circuit includes cells including an energy storage element and cell switching elements connected with anti-parallel diodes. Each cell switching element has a cell switching element controller. The director switch includes director switch units, each having a director switching element and a director switch unit controller. Each cell switching element controller monitors for a fault current and turns-off its associated cell switching element and reports a fault event to a fault controller. Each director switch unit controller monitors for a fault current and reports a fault event to the fault controller but the director switch unit control keeps its associated director switching element turned-on. The fault controller monitors for reports of fault events to order the cell switching elements of at least some of the cells to turn-off.

公开(公告)号：US20180191163A1

公开(公告)日：2018-07-05

申请号：US15741777

申请日：2016-06-09

Applicant: SIEMENS AKTIENGESELLSCHAFT

Inventor： TIMO CHRIST ,  SLAVOMIR SEMAN ,  RAINER ZUROWSKI

IPC: H02J3/36 ,  H02J3/38 ,  F03D9/25 ,  F03D7/02

CPC classification number: H02J3/36 ,  F03D7/0272 ,  F03D9/255 ,  F03D9/257 ,  H02J3/38 ,  H02J3/386 ,  Y02E10/725 ,  Y02E60/60

Abstract: A power generation facility includes at least one generator which has a converter on the generator side and a converter on the network side and which is connected by the converters to an alternating voltage network on the power plant side. A rectifier connects the alternating voltage network on the power plant side to a DC transmission line. An inverter on the energy network side connects the DC transmission line to an energy network operating on the basis of alternating voltage. A control unit is configured to control the converter on the generator side and the converter on the network side of the at least one generator, at least on the basis of DC current and/or DC voltage measurement values measured on the DC transmission line. A method for operating a power generation facility is also provided.

公开(公告)号：US20180183353A1

公开(公告)日：2018-06-28

申请号：US15738758

申请日：2016-06-10

Applicant: HYOSUNG CORPORATION

Inventor： Yo Han BAEK

IPC: H02M7/537 ,  H02M1/08 ,  H02M1/32

CPC classification number: H02M7/537 ,  H02J3/36 ,  H02M1/08 ,  H02M1/084 ,  H02M1/32 ,  H02M1/36 ,  H02M7/12 ,  H02M7/483 ,  H02M2001/0048 ,  H02M2001/327 ,  H02M2007/4835 ,  Y02B70/1491 ,  Y02E60/60

Abstract: The present invention relates to a power supply apparatus and, more particularly, to a power supply apparatus for sub-modules of a MMC (Modular Multilevel Converter), the apparatus stably supplying power to the sub-modules of the MMC connected to an HVDC (High Voltage Direct Current) system.

公开(公告)号：US20180175739A1

公开(公告)日：2018-06-21

申请号：US15735204

申请日：2017-01-19

Applicant: NR ELECTRIC CO., LTD ,  NR ENGINEERING CO., LTD

Inventor： Nannan WANG ,  Wenqiang ZHAO ,  Yongping WANG

IPC: H02M5/45 ,  H02J3/36 ,  H02M5/458

CPC classification number: H02M5/4505 ,  H02H7/26 ,  H02J3/06 ,  H02J3/36 ,  H02M5/4585 ,  Y02E60/60

Abstract: Disclosed in the present invention is a hybrid back-to-back direct current transmission system. The system comprises an LCC converter and a VSC converter in a back-to-back connection, and a first changeover switch, a second changeover switch, a third changeover switch and a fourth changeover switch. The first changeover switch is connected to a first alternating current system and the LCC converter; the second changeover switch is connected to the first alternating current system and the VSC converter; the third changeover switch is connected to a second alternating current system and the VSC converter; and the fourth changeover switch is connected to the second alternating current system and the LCC converter. In forward power delivery, the first changeover switch and the third changeover switch are closed; and in reverse power delivery, the second changeover switch and the fourth changeover switch are closed. Thereby, it is ensured that the VSC converter always performs inversion operation in any power direction, so as to avoid the problem of potential commutation failure for the LCC converter when being in inversion operation. Also provided is a fast power flow reversal control method of the hybrid back-to-back direct current transmission system.

公开(公告)号：US20180159421A1

公开(公告)日：2018-06-07

申请号：US15571715

申请日：2016-04-11

Applicant: The University of Birmingham

Inventor： Xiao-Ping Zhang ,  Ying Xue

IPC: H02M1/32 ,  H02M7/519 ,  H02M7/521 ,  H02M7/525 ,  H02M7/757 ,  H02M1/42

CPC classification number: H02M1/32 ,  H02M1/4208 ,  H02M7/5155 ,  H02M7/519 ,  H02M7/521 ,  H02M7/525 ,  H02M7/7575 ,  Y02E60/60

Abstract: A line commutated converter, LCC, for a high-voltage, direct current, HVDC, power converter comprises at least one bridge circuit for connection to at least one terminal of a DC system. Each bridge circuit comprises a plurality of arms, and each arm is associated with a respective phase of an AC system. Each arm comprises an upper and lower thyristor connected in series, an associated branch extending from between the upper and lower thyristors, and at least one capacitor module for each phase. The, or each capacitor module is operable to insert a capacitor into the respective arm of the bridge circuit.

公开(公告)号：US09948104B2

公开(公告)日：2018-04-17

申请号：US15111216

申请日：2015-01-22

Applicant: NR ELECTRIC CO., LTD. ,  NR ELECTRIC ENGINEERING CO., LTD.

Inventor： Ming Hu ,  Zhenxia Shao ,  Xinyan Jiao ,  Jie Tian ,  Yu Lu ,  Gang Shen

IPC: H02J1/08 ,  H02J3/36 ,  H02M5/458

CPC classification number: H02J3/36 ,  H02J1/08 ,  H02M5/4585 ,  Y02E60/60

Abstract: A tripolar VSC-HVDC system and method include a rectifier and an inverter formed by a three-phase six-bridge arms modular multilevel converter (MMC) respectively, and two converter valves are arranged on the DC side of the rectifier and inverter respectively. The midpoint of upper and lower converter valves of the rectifier and inverter are connected with a pole 3 DC line by a smoothing reactor. Triggering of the upper and lower converter valves is controlled to change the DC voltage polarity of the pole 3 periodically, and tripolar DC transmission is realized by modulating current orders of the three poles.

公开(公告)号：US09882504B2

公开(公告)日：2018-01-30

申请号：US15360336

申请日：2016-11-23

Applicant: Korea Electric Power Corporation

Inventor： Seong Doo Lee ,  Soon Ho Choi ,  Chan Ki Kim

IPC: H02M5/45 ,  H02M1/32 ,  H02J3/36 ,  H02M7/757

CPC classification number: H02M5/4505 ,  H02J3/36 ,  H02M1/32 ,  H02M7/7575 ,  Y02E60/60

Abstract: An HVDC power increase controller includes a command output unit for outputting a current command value according to a disturbance signal to a main controller; a voltage drop determiner receiving an alternating current (AC) voltage and comparing a level of the AC voltage to a lowest level of a voltage causing a rectification failure; and a power tracking determiner receiving a direct current (DC) power and comparing a level of the DC power to an estimated power level corresponding to the current command value. The command output unit adjusts the current command value according to a comparison result of the voltage drop determiner and the power tracking determiner.