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公开(公告)号：US20190140441A1
公开(公告)日：2019-05-09
申请号：US16098878
申请日：2017-04-25
发明人： Gang LI , Yu LU , Zhaoqing HU , Jie TIAN , Yunlong DONG , Tiangui JIANG , Haiying LI , Yadong FENG , Ke WANG , Jiang LU , Shunke SUI , Hui WANG , Nannan WANG
摘要： A method for fault positioning and recovery of a voltage source converter includes following steps. Locking a converter station when it is detected that an alternating-current voltage contains a zero sequence voltage or a direct-current voltage contains an unbalanced voltage. Positioning a fault by continuing to detect the zero sequence voltage of an alternating-current side of the converter. Recovering operation of each station after the fault is positioned. The method for fault positioning and recovery is simple, practical, has high reliability, and can effectively detect the problems that each station contains a zero sequence voltage of an alternating-current side and cannot easily position a fault caused due to transmission of the zero sequence voltage of the alternating-current side to an opposite-side alternating-current system via a voltage source converter.
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公开(公告)号：US20170317574A1
公开(公告)日：2017-11-02
申请号：US15528100
申请日：2015-10-28
发明人： Jiudong DING , Jie TIAN , Yunlong DONG , Haiying LI , Dongming CAO , Haibin LIU , Yu LU
CPC分类号： H02M1/00 , H02M7/00 , H02M7/483 , H02M2001/0003 , H02M2001/325 , H02M2007/4835
摘要： A submodule distributed control method, device and system are provided. Submodules of each bridge arm are grouped. Each group corresponds to one valve based controller. An upper-level control device calculates a weight of each group according to a bridge arm current, an average voltage of normal submodules in each group, and the number of the normal submodules in each group; calculates, according to the number of submodules to be input in a corresponding bridge arm, the number of submodules being input in each group and delivers the number to the valve based controller. The valve based controller operates according to a voltage balancing policy and a gating method that are provided in the prior art.
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公开(公告)号：US20210036600A1
公开(公告)日：2021-02-04
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：US20190326770A1
公开(公告)日：2019-10-24
申请号：US16466835
申请日：2018-01-12
发明人： Jiudong DING , Yu LU , Yunlong DONG , Haiying LI , Jie TIAN , Defeng QIU , Tiangui JIANG , Jianyang LIAN
摘要： The present invention discloses a charging method for a sub-module based hybrid converter. By setting a half-controlled charging link of half-blocking all full bridge sub-modules in a charging process, and raising the voltages of half bridge sub-modules to reach the starting point of a half bridge sub-module based self-powered supply in an uncontrolled stage of the half bridge sub-modules, the starting point of the sub-module based self-powered supply is increased, and the design difficulty of the sub-module based self-powered supply is reduced. The present invention also discloses another charging method for a sub-module based hybrid converter. The above objective can also be achieved by setting a half-controlled charging link of bypassing all full bridge sub-modules in the charging process.
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公开(公告)号：US20190173392A1
公开(公告)日：2019-06-06
申请号：US16322457
申请日：2017-08-02
发明人： Gang LI , Jianchun LI , Jie TIAN , Haiying LI , Yu LU , Yunlong DONG , Zhaoqing HU , Minglian ZHU
摘要： A reconfigurable MMC sub-module unit and a control unit thereof are provided, the reconfigurable MMC sub-module unit is mainly formed by an MMC sub-module unit and a reconfigurable mechanism, wherein the reconfigurable mechanism is formed by switches, and the conversion of MMC sub-module unit topology is achieved through switching on and off the switches in the reconfigurable mechanism. According to the reconfigurable MMC sub-module unit and the control unit thereof, the rapid change of a topology structure for a converter can be achieved, which is suitable for the demand of the line connection of the medium-voltage power distribution network and variable topologies, and meets requirements of dynamic simulation experiment for different converter topologies in the dynamic simulation experiment, thereby reducing construction costs and duration, improving experiment efficiency, and having high flexibility and strong versatility.
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公开(公告)号：US20200076321A1
公开(公告)日：2020-03-05
申请号：US16469086
申请日：2018-01-12
发明人： Jiudong DING , Yu LU , Yunlong DONG , Haiying LI , Jie TIAN , Defeng QIU , Tiangui JIANG , Jianyang LIAN
摘要： The present invention discloses a charging method for a sub-module based hybrid converter. By setting a half-controlled charging link of changing full bridge sub-modules from a blocked state to a half-blocked state one by one in a charging process, and raising the voltages of half bridge sub-modules to reach the starting point of a half bridge sub-module based self-powered supply in an uncontrolled stage of the half bridge sub-modules, the starting point of the sub-module based self-powered supply is increased, and the design difficulty of the sub-module based self-powered supply is reduced. The present invention also discloses another charging method for a sub-module based hybrid converter. The above objective can also be achieved by setting a half-controlled charging link of changing the full bridge sub-modules from a blocked state to a bypassed state one by one in the charging process.
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公开(公告)号：US20190260201A1
公开(公告)日：2019-08-22
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, wherein the current output command limit Imax is used to limit the current commands I*Ldq of inner loop dq currents, and in the event of the fault of AC system, Imax is set equal to or slightly larger than a value for an AC line overcurrent protection section III. The value for the II section of the converter bridge arm overcurrent protection is smaller than the value for the II section of the AC line overcurrent protection or the value is equal; the set value for AC line overcurrent protection section I is smaller than the set value for converter bridge arm overcurrent protection section I; the value for proximal AC line overcurrent protection section II is less than or equal to the value for converter bridge arm overcurrent protection section II, and under such condition, the delay is longer than the AC line overcurrent protection section II. At the time of detecting a fault on the connected line side of the converter, the value of current output command limit Imax of the converter is changed from the allowable multiple of output current of the converter under normal condition to the value for the AC line protection section III in the event of fault. And, partial short circuit current is provided by limiting the output current of the converter, the AC fault is removed by the value for AC protection section III without affecting the normal operation of the converter. After the AC side fault is removed, Imax is restored to an allowable multiple of output current of the converter under normal condition. The method of switching Imax is that: pre-setting a series or curve of n groups of two-dimensional numerical values (ULj, Imaxj) (j=1, 2, . . . n), the limit current command value Imax is obtained by using interpolation or lookup table method, to limit the output current value of the converter operating in passive state.
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公开(公告)号：US20160226306A1
公开(公告)日：2016-08-04
申请号：US15025282
申请日：2014-09-25
发明人： Yunlong DONG , Jie TIAN , Haiying LI , Dongming CAO
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. 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.
摘要翻译： 本发明公开了一种直流（DC）电压控制方法。 本发明还公开了一种用于实现该方法的装置。 通过本发明，可以降低在直流电压一次控制站停止运行时引起的系统的直流电压振荡。
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公开(公告)号：US20210242792A1
公开(公告)日：2021-08-05
申请号：US17268536
申请日：2019-08-15
发明人： Chen XIE , Zhongfeng ZHANG , Jie TIAN , Yeyuan XIE , Haiying LI , Yu WANG , Jian GE
摘要： A bipolar bidirectional DC converter comprises at least two valve group series (101, 102) and at least six magnetic elements (103), and said valve group series are divided into a Type-I valve group series (102) and a Type-II valve group series (101) each valve group series (101, 102) comprises a high-voltage DC port, a low-voltage DC port and at least three AC ports, and each AC port is connected to a magnetic element (103); and the other ends of the magnetic elements (103), which are connected to all the AC ports in the same valve group series (101, 102), are connected.
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公开(公告)号：US20210126462A1
公开(公告)日：2021-04-29
申请号：US16770458
申请日：2018-11-28
发明人： Jiang LU , Yu LU , Yunlong DONG , Yongping WANG , Jie TIAN , Haiying LI , Zhaoqing HU , Nannan WANG , Ke WANG , Jiudong DING
摘要： A coordinated control method for series voltage source converter valve groups comprises: allocating a total direct-current voltage reference value or a total active power reference value at the end where a direct-current electrode series voltage source converter valve group is located according to the total number of voltage source converter valve groups in series; for a direct-current voltage control end, controlling the direct-current voltage of each valve group according to the assigned direct-current voltage reference value for each valve group; for an active power control end, controlling the active power of each valve group according to the assigned active power reference value for each valve group and based on adding the active power compensation amount of the valve group which has voltage equalization effects on the valve group. Correspondingly, also providing a coordinated control device for series voltage source converter valve groups. The direct-current voltage equalization of each valve group in operation of the direct-current voltage control end or the active power control end of the series voltage source converter valve group is achieved.
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