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公开(公告)号：US10270332B2
公开(公告)日：2019-04-23
申请号：US16081437
申请日：2017-04-06
发明人： Zhaoqing Hu , Yunlong Dong , Yu Lu , Haiying Li , Dongming Cao
IPC分类号： H02M1/32 , G05F1/70 , G05F1/66 , H02J3/36 , H02M5/458 , H02H5/04 , H02H9/00 , H02H7/12 , H02J3/18 , G01R21/00 , H02M1/00 , H02M7/483
摘要： According to the overload current limiting method for a voltage source converter, when a pole control system receives a water-cooling overload current limiting instruction, an active and reactive instruction are changed at the same time according to a specified slope, so that an absolute value of an arm current of the converter decreases in a fixed slope, and can be ensured that active power and reactive power fall to zero at the same time, and a water-cooling load limiting aim of the converter can be achieved by reducing the arm current. After a water-cooling overload power limiting instruction received by the pole control system is cancelled, a current value of the active power and the inactive power remain unchanged. When a water-cooling overload power limiting instruction is received again, decrease continues on the basis of current power values until the power falls to zero.
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公开(公告)号：US20190109459A1
公开(公告)日：2019-04-11
申请号：US16086317
申请日：2017-04-19
发明人： Ke WANG , Gang LI , Yu LU , Yunlong DONG , Jiang LU , Zhaoqing HU , Tiangui JIANG
摘要： Provided is a method for controlling a zero sequence voltage of a voltage source converter. When an alternating current system ground fault occurs, a zero sequence voltage at an alternating current (AC) side or a zero sequence voltage at a direct current (DC) side of a converter is detected. If the detected zero sequence voltage is greater than a set value V0ref, a DC side voltage of the converter can be increased to a set value Udc0, thereby generating an appropriate reference wave at the AC side of the converter to match an AC voltage, and accordingly controlling overmodulation of a reference wave at a faulty station to suppress fluctuation of a DC voltage.
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公开(公告)号：US10237986B2
公开(公告)日：2019-03-19
申请号：US15748613
申请日：2016-07-13
发明人： Chihan Chen , Taixun Fang , Fan Yang , Biao Gao , Lele Li , Lei Liu
摘要： A shell structure for a thyristor trigger unit comprises an integrally-formed shell body with a holder and a cuboid structure, and a side plate. The cuboid structure is a cuboid with an opening in its front where an open face is formed at the front opening of the cuboid. The cuboid further includes a rear panel, a left panel, a right panel, an upper panel, and a lower panel. The holder includes a square retaining plate and two triangular stiffener plates. The square retaining plate is formed by a bottom panel extending towards a side of the left panel in a long side direction of the cuboid while the triangular stiffener plates are fixedly connected between the square retaining plate and the left panel. The side plate is mated with and detachably mounted on the open face to produce a sealed 6-face cuboid structure by sealing off said open face.
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14.发明申请公开(公告)号：US20190070964A1
公开(公告)日：2019-03-07
申请号：US16080276
申请日：2017-03-01
发明人： Hao YANG , Yu WANG , Yeyuan XIE , Hongde LIU , Changwei LI
摘要： A locomotive regenerative electric energy feedback system with an ice melting function, comprising two regenerative electric energy feedback devices (1). A direct-current side positive electrode of the regenerative electric energy feedback device (1) is connected to a positive electrode bus of a subway traction network, wherein the positive electrode bus is connected to an uplink contact network and a downlink contact network respectively via a first switching switch (4) and a second switching switch (5). A direct-current side negative electrode of the regenerative electric energy feedback device (1) is connected to the downlink contact network or the uplink contact network via a third switching switch (2), and the direct-current side negative electrode is connected to a negative electrode bus of the subway traction network via a fourth switching switch (3). Further disclosed is a control method corresponding to the system. In the system and method, the ice melting function on a contact network circuit between two traction stations is achieved by means of switch switching and a control method for adjusting the regenerative electric energy feedback devices, and an original regenerative electric energy feedback device is used without adding an additional device, so that the reliability is high.
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公开(公告)号：US10148091B2
公开(公告)日：2018-12-04
申请号：US15541807
申请日：2016-01-21
发明人： Dongbin Lu , Yongping Wang , Zhenxi Wang , Qiang Zou
摘要： A high voltage direct current power transmission series valve group control device, is used for regulating a series circuit having two or more valve groups provided with controllable power semiconductors respectively. Each valve group is provided with a current regulation unit and a voltage regulation unit. The current regulation unit controls a direct current current flowing through a valve group corresponding thereto, and the voltage regulation unit controls a voltage across two ends of a valve group corresponding thereto. One valve group is selected from the series valve group as a master control valve group, while the others are taken as slave control valve groups. The master control valve group selects a trigger angle output by the current regulation unit to control same, and the slave control valve group selects a trigger angle obtained after the trigger angle transmitted from the master control valve group and an output value of the voltage regulation unit pass through a subtractor to control same.
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16.发明申请公开(公告)号：US20180183231A1
公开(公告)日：2018-06-28
申请号：US15570750
申请日：2016-07-13
发明人： YEYUAN XIE , MINGLIAN ZHU , TIANGUI JIANG , CHUANJUN BO , MIN LI
IPC分类号： H02H7/12 , H03K17/081
CPC分类号： H02H7/1203 , H02M1/32 , H02M7/5387 , H02M2007/4835 , H03K17/08116 , H03K17/08146
摘要： Disclosed are a fault current-suppressing damper topology circuit and a control method thereof and a converter. An anode of a separate diode is connected to a positive electrode of a second switch module, a cathode of the separate diode is connected to one end of an energy storage capacitor, and the other end of the energy storage capacitor is connected to a negative electrode of a first switch module; a damping resistor is connected in parallel with an arrester and then with the first switch module; a bypass switch is connected in parallel between a terminal x1 and a terminal x2 of the damper topology circuit; a power supply system acquires energy from the energy storage capacitor and supplies power to a control system; and the control system controls an operating state of the damper topology circuit by controlling the bypass switch, the first switch module and the second switch module. The fault current-suppressing damper topology circuit is applied to voltage source converters. In case of a DC fault, stress resulting from fault currents is reduced by use of a damping resistor, thereby avoiding damages to a device and achieving self-power supply, modularization and independent control. The fault current-suppressing damper topology circuit can be flexibly applied to various types of voltage source converters and has outstanding economic efficiency and technicality.
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17.发明申请公开(公告)号：US20170278599A1
公开(公告)日：2017-09-28
申请号：US15505915
申请日：2015-09-29
发明人： Taixun FANG , Xiang ZHANG , Lei LIU , Zhao LI , Guangtai ZHANG , Fengfeng DING , Huiliang ZHANG
CPC分类号： H01C1/08 , H01C1/01 , H01C1/014 , H01C1/028 , H01C1/12 , H01C1/14 , H01C3/10 , H01L23/46 , H05B3/48
摘要： Disclosed are a resistor, a heat dissipater and a combinatory device of the resistor and the heat dissipater, and relates to the field of power electronics. The resistor is cylindrical, and comprises a metal end, an insulating part, a casing, metal bars, a resistor wire, thermally conductive insulating fillers and a metal connection mechanism. The metal connection mechanism of the resistor and the heat dissipater are connected by means of direct contact. The structure and the connection method can shorten the length of the resistor, completely insulate the electrical circuits of the resistor from the possible leakage of the water inlet- and outlet-pipe of the heat dissipater, and enable the combinatory device of the resistor and the heat dissipater to be structurally more compact and the connections thereof cleaner.
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公开(公告)号：US09634476B1
公开(公告)日：2017-04-25
申请号：US15119730
申请日：2013-12-27
发明人： Dongming Cao , Taixun Fang , Yu Wang , Hao Yang , Bing Yang , Wei Shi , Wei Lu
摘要： An apparatus for breaking a line bidirectional current and a control method therefore. The apparatus comprises a breaking current branch circuit and an on-state current branch circuit, the breaking current branch circuit comprises one nonlinear resistor being connected in parallel to one first power semiconductor device, or one nonlinear resistor being connected in parallel to at least two first power semiconductor devices mutually connected in series; and the on-state current branch circuit comprises at least one bidirectional power semiconductor switch being connected in series to at least one high-speed isolation switch. The apparatus also comprises a bridge-type branch circuit. An apparatus for breaking a line bidirectional current, thereby greatly reducing costs of the apparatus and reducing difficulty in device layout, mounting and wiring of the apparatus on the premise of ensuring a breaking speed that is quick enough and a low loss.
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19.发明申请DIRECT-CURRENT POWER TRANSMISSION PROTECTION DEVICE, CONVERTER AND PROTECTION METHOD 审中-公开直流电力传输保护装置，转换器和保护方法公开(公告)号：US20170047727A1
公开(公告)日：2017-02-16
申请号：US15118669
申请日：2014-05-04
发明人： Dongming Cao , Yeyuan Xie , Zhenxia Shao , Yu Lu , Min Li , Haibin Lu , Haiying Li
CPC分类号： H02H3/202 , H02H7/10 , H02H7/1227 , H02H7/1252 , H02H7/1257 , H02H7/127 , H02M1/32 , H02M7/2173 , H02M2007/4835 , H05K7/20927
摘要： The present invention discloses a direct-current power transmission protection device, including a resistor unit and a bidirectional circulation current switch unit, and the resistor unit and the bidirectional circulation current switch unit being connected in parallel to form the protection device, where at least one resistor is cascaded to form the resistor unit, and at least one bidirectional circulation current switch is cascaded to form the bidirectional circulation current switch unit. In addition, the present invention also provides a converter including the protection device, and at least one protection device is connected in series in each phase unit. The present invention provides the protection device, the converter and a protection method for flexible direct-current power transmission, which can rapidly and effectively suppress direct-current short circuit current and damp current oscillation, and not only can better protect equipment safety, but also can greatly shorten fault current attenuation time, thus shortening direct-current shutdown time and further decreasing economic loss and system destabilization risk caused by shutdown to the max. Moreover, the protection device is structurally simple and low in cost, and has good implementability and economic efficiency.
摘要翻译： 本发明公开了一种直流电力传输保护装置，包括电阻单元和双向循环电流开关单元，并且电阻单元和双向循环电流开关单元并联连接以形成保护装置，其中至少一个 电阻器级联形成电阻器单元，并且至少一个双向循环电流开关级联以形成双向循环电流开关单元。 此外，本发明还提供一种包括保护装置的转换器，并且至少一个保护装置在每个相位单元中串联连接。 本发明提供了保护装置，转换器和柔性直流输电的保护方法，可以快速，有效地抑制直流短路电流和潮流振荡，不仅可以更好地保护设备安全，而且还可以 可以大大缩短故障电流衰减时间，从而缩短直流关机时间，进一步降低停机造成的经济损失和系统不稳定风险。 此外，保护装置结构简单，成本低，具有良好的可实施性和经济效益。
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公开(公告)号：US20170040885A1
公开(公告)日：2017-02-09
申请号：US15124678
申请日：2014-01-17
发明人： Nannan WANG , Jie TIAN , Yunlong DONG , Gang LI , Dongming CAO
IPC分类号： H02M1/32
CPC分类号： H02M1/32 , H02M1/36 , H02M7/483 , H02M2001/325 , H02M2007/4835
摘要： A method for charging a modular multilevel converter includes: firstly, electrifying DC side of a converter; after voltages of submodules are stabilized, deblocking the converter, turning on all the submodules, then reducing the number of turned on submodules in phase unit; when over-current occurs on a bridge arm, temporarily increasing the number of turned on submodules to suppress the over-current; after the voltages of the sub-modules are stabilized, continuously reducing the number of the turned on submodules until the number of the turned on submodules in the phase unit is finally equal to the number of working submodules of the bridge arm, so as to smoothly transit to a normal operation state. The DC side is charged, such that the voltages of the submodules reach a working voltage before the converter normally operates, and an impacting current is avoided in the charging process by using a proper control strategy.
摘要翻译： 模块化多电平转换器的充电方法包括：首先，使转换器的直流侧通电; 在子模块电压稳定后，转换器去块，打开所有子模块，然后减少相模块中的导通子模块数量; 当在桥臂上发生过电流时，临时增加接通子模块的数量以抑制过电流; 在子模块的电压稳定之后，连续地减少导通子模块的数量，直到相位单元中的接通子模块的数量最终等于桥臂的工作子模块的数量，以便平滑地 过渡到正常运行状态。 DC侧被充电，使得子模块的电压在转换器正常工作之前达到工作电压，并且通过使用适当的控制策略在充电过程中避免了冲击电流。
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