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1.发明授权公开(公告)号：US10224833B2
公开(公告)日：2019-03-05
申请号：US15579935
申请日：2016-07-13
发明人： Yeyuan Xie , Dongming Cao , Tiangui Jiang , Minglian Zhu , Guanxian Yin
IPC分类号： H02M7/5387 , H02M7/219 , H02J7/00 , H02M3/00 , H02M3/139 , H01M10/42 , G06F13/00 , H02M3/137 , H02M7/00 , H02M1/32 , H02M7/483
摘要： Disclosed are a modulation method of a modular multilevel converter and a fault isolation method of a submodule unit. The modulation method comprises a first mode and a second mode, and the first mode and the second mode operate cyclically. In the first mode, a first power semiconductor switch and a second power semiconductor switch are turned on alternately, while a third power semiconductor switch is turned off normally and a fourth power semiconductor switch is turned on normally. In the second mode, the third power semiconductor switch and the fourth power semiconductor switch are turned on alternately, while the first power semiconductor switch is turned on normally and the second power semiconductor switch is turned off normally. The method enables junction temperatures of the power semiconductor switches used to be equalized, increases an operation safety margin of the converter, effectively increase the capacity of the converter without increasing engineering costs, and achieve better performance in both economic efficiency and technicality.
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公开(公告)号：US10454265B2
公开(公告)日：2019-10-22
申请号：US16086011
申请日：2017-04-17
发明人： Dongming Cao , Taixun Fang , Yeyuan Xie , Bing Yang , Wei Shi , Wei Lv , Wenjie Wang , Bin Liu , Tao Wang
摘要： A bridge-type circuit comprises a H-bridge switch module and a buffering and reclosing module. The H-bridge switch module comprises four power semiconductor switch devices. Every two of the four power semiconductor switch devices are connected in series in the same direction to form a bridge arm, and the two bridge arms are further connected in parallel. Middle points of the two bridge arms respectively serve as an input terminal and an output terminal. The buffering and reclosing module is connected in parallel with the two bridge arms of the full bridge module. Also provided are a direct current breaking device formed by connecting the above bridge-type circuits in cascade and a control method thereof. The direct current breaking device is provided with the buffering and reclosing module, such that line voltage fluctuation generated during a reclosing operation is small.
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公开(公告)号：US10396561B2
公开(公告)日：2019-08-27
申请号：US15027434
申请日：2013-07-01
发明人： Yunlong Dong , Jie Tian , Gang Li , Dongming Cao , Haiying Li , Haibin Liu
摘要： The present invention discloses a coordination control method of a multi-terminal VSC-HVDC transmission system. If a direct current voltage master control station shuts down, a direct current voltage control slave station takes over direct current voltage control, and remaining convertor stations keep original control modes. The takeover steps comprise that under the condition that inter-station communications are effective, the master control station sends a shutdown message to the slave station through the inter-station communications, and when the slave station monitors that the direct current voltage master control station shuts down, the slave station switches a current control mode into a direct current voltage control mode; and under the condition that inter-station communications fail or inter-station communications are absent, the slave station monitors changes of the direct current voltage of a system.
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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：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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6.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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7.发明授权Apparatus for limiting current of line or breaking current, and control method thereof 有权用于限制线路或断路电流的装置及其控制方法公开(公告)号：US09362734B2
公开(公告)日：2016-06-07
申请号：US14764575
申请日：2013-12-27
发明人： Yu Wang , Dongming Cao , Taixun Fang , Hao Yang , Bing Yang , Wei Shi , Wei Lu
CPC分类号： H02H3/08 , H01H9/542 , H01H9/548 , H01H33/596 , H01H71/1045 , H01H2009/0083 , H02H9/02
摘要： An apparatus for limiting a current of a line or breaking a current, and a control method thereof are disclosed. The apparatus includes a current breaking branch (29) and a bridge branch. The bridge branch includes two bridge arms formed by four identical current commutation branches. Every two of the four current commutation branches are connected in series, and the formed two bridge arms are then connected in parallel. The two bridge arms are both connected in parallel to the current breaking branch, and middle points of the two bridge arms are separately connected to two ends of a line. Each current commutation branch includes at least one high-speed isolation switch (6) and at least one bidirectional power semiconductor switch (10) that are connected in series. The apparatus can turn off currents in two directions.
摘要翻译： 公开了一种限制线路电流或断开电流的装置及其控制方法。 该装置包括断路支路（29）和桥接支路。 桥分支包括由四个相同的当前换向分支形成的两个桥臂。 四个当前整流分支中的每两个串联连接，并且形成的两个桥臂然后并联连接。 两个桥臂均与当前断裂分支并联，两个桥臂的中点分别连接到一条线的两端。 每个电流换向分支包括串联连接的至少一个高速隔离开关（6）和至少一个双向功率半导体开关（10）。 该装置可以在两个方向关断电流。
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公开(公告)号：US11264891B2
公开(公告)日：2022-03-01
申请号：US16966459
申请日：2019-01-21
发明人： Yeyuan Xie , Haiying Li , Tiangui Jiang , Minglian Zhu , Dongming Cao , Zhongfeng Zhang
摘要： A redundant energy acquisition circuit of a power module includes at least one power semiconductor device, a first capacitor, and a first bypass switch. The redundant energy acquisition circuit of the power module includes: a power supply board acquiring energy from the first capacitor, supplying power to a control board, and charging a discharge circuit. A first charging circuit has one end connected to a positive electrode of the first capacitor and another end connected to the discharge circuit, and charges the discharge circuit when the power supply board is not operating normally. The control board controls the discharge circuit to close. The discharge circuit discharges and triggers the first bypass switch to close after the discharge circuit is closed.
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公开(公告)号：US11190020B2
公开(公告)日：2021-11-30
申请号：US16643472
申请日：2018-05-07
发明人： Nannan Wang , Yu Lu , Yunlong Dong , Jie Tian , Dongming Cao , Haiying Li , Chongxue Jiang , Jiacheng Wang
摘要： A DC voltage coordination control method is applied to a multi-terminal VSC-HVDC power transmission system or a VSC-HVDC power grid system. When a lower-level control is used in the active power control mode, the active power reference value of the converter is generated according to the converter DC voltage and the converter DC voltage active power curve; it also includes an upper-level control to adjust the control mode and active power setting value of the lower-level control to ensure the steady-state performance of the system. This method has low dependence on communication, avoids the problem that the fixed slope and margin cannot meet all operating conditions, and is suitable for large-scale VSC-HVDC systems, and has scalability.
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公开(公告)号：US10461525B2
公开(公告)日：2019-10-29
申请号：US16336064
申请日：2017-08-18
发明人： Zhaoqing Hu , Yunlong Dong , Ke Wang , Haiying Li , Dongming Cao
摘要： A fault current limiting control and protection coordination method for a converter of a flexible direct current transmission system operating in an islanding state is provided. The current output command limit Imax is used to limit the current commands of inner loop currents, and in the event of a fault, Imax is set equal to or slightly larger than a value for an AC line overcurrent protection section.
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