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9 条记录 (耗时 0.008 秒)

    METHOD AND APPARATUS FOR CONTROLLING DIRECT-CURRENT VOLTAGE
    1.
    发明公开
    METHOD AND APPARATUS FOR CONTROLLING DIRECT-CURRENT VOLTAGE 审中-公开
    方法和设备用以控制DC电压

    公开(公告)号：EP3051653A4

    公开(公告)日：2017-03-15

    申请号：EP14846869

    申请日：2014-09-25

    申请人： NR ELECTRIC CO LTD ,  NR ENG CO LTD

    发明人： DONG YUNLONG ,  TIAN JIE ,  LI HAIYING ,  CAO DONGMING

    IPC分类号： H02J3/36

    CPC分类号： H02J13/0003 ,  H02J1/00 ,  H02J3/36 ,  Y02E60/60

    摘要： The present invention discloses a direct current (DC) voltage control method, including: determining, when it is determined that a DC voltage primary control station loses a DC voltage control function, whether the DC voltage primary control station can communicate with the DC voltage secondary control station, and if yes, sending, by the DC voltage primary control station, information about the DC voltage primary control station losing the DC voltage control function to the at least one DC voltage secondary control station and enabling a DC voltage control function of one DC voltage secondary control station, so as to adjust a DC voltage; before the DC voltage control function of the DC voltage secondary control station is enabled, if the DC voltage exceeds an operation range, enabling, by the at least one DC voltage secondary control station, a DC voltage auxiliary control function, so as to adjust emitted or absorbed active power; and when the DC voltage primary control station cannot communicate with all of or some of the at least one DC voltage secondary control station, and if the DC voltage exceeds the operation range, enabling, by at least one DC voltage secondary control station, a DC voltage auxiliary control function, so as to adjust current emitted or absorbed active power, and determining, according to a policy, one DC voltage secondary control station to enable a DC voltage control function, so as to adjust the DC voltage. The present invention further discloses an apparatus for implementing the method. With the present invention, DC voltage oscillation of a system, which is caused when a DC voltage primary control station stops running, may be reduced:

    VOLTAGE-SOURCE MULTI-LEVEL CONVERTER, DIRECT-CURRENT POWER TRANSMISSION SYSTEM AND FAULT PROCESSING METHOD AND DEVICE
    3.
    发明公开
    VOLTAGE-SOURCE MULTI-LEVEL CONVERTER, DIRECT-CURRENT POWER TRANSMISSION SYSTEM AND FAULT PROCESSING METHOD AND DEVICE 审中-公开

    公开(公告)号：EP3145071A4

    公开(公告)日：2018-01-17

    申请号：EP15788904

    申请日：2015-02-05

    申请人： NR ELECTRIC CO LTD ,  NR ENG CO LTD

    发明人： SHEN GUORONG ,  TIAN JIE ,  CAO DONGMING ,  LI HAIYING ,  DONG YUNLONG ,  WANG NANNAN ,  LIU HAIBIN ,  LU YU

    IPC分类号： H02J3/36 ,  H01H9/50 ,  H02J1/00 ,  H02M7/483

    CPC分类号： H02J1/00 ,  H02H9/04 ,  H02J3/36 ,  H02M1/32 ,  H02M7/483 ,  H02M2007/4835

    摘要： A voltage-source multi-level converter, including a phase unit (0). The phase unit (0) includes a first bridge arm (100) and a second bridge arm (200), where a first terminal of the first bridge arm (100) is a first DC terminal (P) of the phase unit (0), and a first terminal of the second bridge arm (200) is a second DC terminal (N) of the phase unit (0); a second terminal of the first bridge arm (100) and a second terminal of the second bridge arm (200) are shorted together, as an alternating-current terminal (A) of the phase unit (0); the first bridge arm (100) includes first modules (101) and one first reactor (102) connected in series, where a first terminal of the first reactor (102) is connected to the alternating-current terminal (A), a second terminal (X1) thereof is connected to a first terminal of the first modules (101), and a second terminal of the first modules (101) is connected to the first DC terminal (P); the second bridge arm (200) includes second modules (201) and one second reactor (202) connected in series, where a first terminal of the second reactor (202) is connected to the alternating-current terminal (A), a second terminal (X2) thereof is connected to a first terminal of the second modules (201), and a second terminal of the second modules (201) is connected to the second DC terminal (N); and a parallel fault shunt circuit (300) is connected between the second terminals (X1, X2) of the first reactor (102) and the second reactor (202). Also disclosed are a DC power transmission system and a fault processing method and device.

    STARTING METHOD AND STOPPING METHOD FOR STATIC SYNCHRONOUS SERIES COMPENSATOR
    6.
    发明公开
    STARTING METHOD AND STOPPING METHOD FOR STATIC SYNCHRONOUS SERIES COMPENSATOR 审中-公开

    公开(公告)号：EP3223383A4

    公开(公告)日：2018-01-17

    申请号：EP15830207

    申请日：2015-08-04

    申请人： NR ELECTRIC CO LTD ,  NR ENG CO LTD

    发明人： PAN LEI ,  TIAN JIE ,  SHEN QUANRONG ,  WANG XINBAO ,  LU YU ,  DONG YUNLONG ,  CHANG BAOLI

    IPC分类号： H02J3/18 ,  H02M1/36

    CPC分类号： H02J3/00 ,  H02J3/1807 ,  H02M1/36 ,  Y02E40/10

    摘要： A starting and stopping method for a static synchronous series compensator (SSSC) is provided. A starting process includes: first, connecting a converter (4) to a shunt transformer (2), and closing an incoming line switch (1) of the shunt transformer to charge the current converter until a direct-current voltage is stable; then, opening the incoming line switch of the shunt transformer, and connecting the converter to a series transformer (5) through a change-over switch (3); deblocking the converter, and controlling a current of a bypass switch (6) of the series transformer to approach zero; further, opening the bypass switch of the series transformer, and enabling the converter to enter a normal operation mode after a line is stable; and in stopping the SSSC, first, switching a control mode of the converter to make the current of the bypass switch approaches zero when closed the bypass switch, then controlling a current of the series transformer to be gradually reduced to zero to make the series transformer out of service, and then blocking the converter. By means of the method, an overvoltage and an overcurrent of a converter when a series transformer is put into use and exits can be effectively suppressed, and current oscillation of an line and impact on the series transformer can be reduced, thereby achieving stable starting and stopping of an SSSC

    ISLAND-TO-NETWORK SWITCHING METHOD
    8.
    发明公开
    ISLAND-TO-NETWORK SWITCHING METHOD 审中-公开

    公开(公告)号：EP3211743A4

    公开(公告)日：2018-01-24

    申请号：EP15871856

    申请日：2015-12-09

    申请人： NR ELECTRIC CO LTD ,  NR ENG CO LTD

    发明人： DONG YUNLONG ,  TIAN JIE ,  HU ZHAOQING ,  LI HAIYING ,  CAO DONGMING ,  LIU HAIBIN ,  LU YU

    IPC分类号： H02J3/36 ,  H02J3/38

    CPC分类号： H02J3/36 ,  H02J3/38 ,  Y02E60/60

    摘要： The present invention discloses a passive islanding to grid-connection switching method for a VSC HVDC transmission system. When the VSC HVDC transmission system in an island operation state, whether the VSC HVDC transmission system enters a grid-connection state is determined by detecting whether an overcurrent phenomenon has occurred in a converter valve-side three-phase alternating-current or a converter bridge arm current, and detecting a change status of an alternating-current side voltage. The system is controlled to switch from an island operation control mode to a grid-connection control mode. At a moment of switching, the online control mode is smoothly switched to by changing a power instruction and performing phase tracking on a current grid voltage, so that continuous operation of the system is maintained.

    SUB-MODULE, PROTECTION UNIT, CONVERTER, AND CONTROL METHOD THEREOF
    9.
    发明公开
    SUB-MODULE, PROTECTION UNIT, CONVERTER, AND CONTROL METHOD THEREOF 有权
    超音速，SCHUTZEINHEIT，WANDLER UND STEUERUNGSVERFAHRENDAFÜR

    公开(公告)号：EP2999103A4

    公开(公告)日：2017-03-22

    申请号：EP14797222

    申请日：2014-05-05

    申请人： NR ELECTRIC CO LTD ,  NR ENG CO LTD

    发明人： DONG YUNLONG ,  CAO DONGMING ,  TIAN JIE ,  LI HAIYING ,  WANG NANNAN

    IPC分类号： H02M1/32 ,  H02M7/483

    CPC分类号： H02M1/32 ,  H02M2007/4835

    摘要： Disclosed are a sub-module structure formed of an energy storage element, a first turn-off device, a second turn-off device, a third turn-off device, a freewheeling diode, a series resistor, and diodes respectively in antiparallel connection with the turn-off devices, and a converter completely or partially formed of the sub-modules. Also disclosed are a relevant protection unit and a control method for the converter. The converter can be locked when a direct current (DC) fault occurs to prevent an alternating current (AC) system from injecting a fault current into a DC network, so that a transient fault of the DC network can be removed without tripping an AC line switch, thereby rapidly restarting the system. A charging resistor is comprised in the sub-module so that a charging resistor disposed at an AC side of the converter can be reduced and even may not be dispose.

    摘要翻译： 公开了一种子模块结构，其分别与能量存储元件，第一关断装置，第二关断装置，第三关断装置，续流二极管，串联电阻器和二极管分别反向并联连接 关断装置和由子模块完全或部分地形成的转换器。 还公开了用于转换器的相关保护单元和控制方法。 当直流（DC）故障发生时，转换器可以锁定，以防止交流（AC）系统将故障电流注入直流网络，从而可以消除直流网络的瞬态故障而不跳闸交流线路 切换，从而快速重启系统。 在子模块中包括充电电阻器，从而可以减少设置在转换器的AC侧的充电电阻器，甚至可以不配置。