-
公开(公告)号：US11329486B2
公开(公告)日：2022-05-10
申请号：US16607847
申请日：2018-04-27
发明人： Ke Wang , Shunke Sui , Yu Lu , Yunlong Dong , Zhaoqing Hu , Gang Li
摘要： During initiation under an isolated island condition, the amplitude of a voltage reference wave output generated by a flexible DC transmission control and protection system is in a segmented mode, wherein a first segment of the reference wave amplitude begins at zero or a fixed value Ux and rapidly increases to Ua kV at a rate of a kV/s, avoiding a low output voltage reference wave and high error and harmonic content of a sampled voltage and current. A second segment increases to Ub kV at a rate of β kV/s, a third segment increases to Uc kV at a rate of γ kV/s, and the Nth segment increases to a rated voltage of UN kV at a rate of ε kV/s, thereby achieving non-disturbance and shockless initiation of a flexible DC transmission system under an isolated island condition.
-
公开(公告)号：US11146071B2
公开(公告)日：2021-10-12
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.
-
公开(公告)号：US20210222673A1
公开(公告)日：2021-07-22
申请号：US16759309
申请日：2018-10-23
发明人： Jiacheng Wang , Yu Lu , Nannan Wang , Zhaoqing Hu , Yunlong Dong , Gang Li , Chongxue Jiang
摘要： The invention relates to an island converter overload limit method and device for a bipolar flexible DC transmission system, and belongs to the field of DC transmission. During stable island operation, both bipolar converters adopt a voltage-frequency droop control strategy; and once it is detected that one converter is overloaded, the control mode of the overloaded converter is automatically switched to active-wattless power control from voltage-frequency droop control to fulfill an overload limit function. The method effectively avoids an overload of the bipolar flexible DC transmission system under island operation, effectively maintains the AC voltage and frequency stable, and has important guiding significance for applying island systems to DC power grids.
-
公开(公告)号：US11009542B2
公开(公告)日：2021-05-18
申请号：US16496384
申请日：2018-06-20
发明人： Fan Yang , Lei Liu , Xiang Zhang , Chen Zhou , Weiming Pan , Taixun Fang
IPC分类号： G01R31/26 , G01R31/333
摘要： A thyristor valve test system based on cooperation of logic functions of software, wherein the test system comprises: a thyristor valve (5) to be tested, a VBE (3) and a tester (4), and the VBE (3) has a dedicated test mode, the tester (4) provides three steps for each test item. The thyristor valve (5) to be tested and the VBE (3) are connected by optical fibers (1), and the thyristor valve (5) to be tested and the tester (4) are connected by cables (2), and there is no connection between the VBE (3) and the tester (4).
-
5.发明授权公开(公告)号：US10797487B2
公开(公告)日：2020-10-06
申请号：US16345426
申请日：2017-11-24
发明人： Jiang Lu , Yu Lu , Yunlong Dong , Nannan Wang , Yongping Wang , Wenqiang Zhao , Jie Tian , Haiying Li
摘要： Provided is an on-line input and quit control method for a voltage-source converter unit. The method achieves the on-line input of a voltage-source converter unit by means of performing steps, such as charging control, deblocking transfer control and operation adjustment control, on a voltage-source converter to be input, and achieves the on-line quitting of the voltage-source converter unit by means of performing steps, such as direct-current voltage reduction control, bypass transfer control and converter blocking control, on a voltage-source converter to be quit. Correspondingly, provided is an on-line input and quit control device for a voltage-source converter unit, which can achieve the on-line steady input and quitting of a voltage-source converter in a series-type hybrid direct-current power transmission system or a series-type flexible direct-current power transmission system, without affecting the normal and stable operation of other already running converters.
-
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.
-
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.
-
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.
-
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.
-
10.发明申请公开(公告)号：US20190190315A1
公开(公告)日：2019-06-20
申请号：US16062635
申请日：2016-04-14
发明人： Zongguang XU , Jifeng WEN , Yong CHEN , Xiang LI , Yan LI , Yucan ZHAO , Ming YUAN , Qiang ZHOU , Guanghua LI , Tianen ZHAO , Dewen LI
CPC分类号： H02J13/0062 , G06F9/3877 , G06F11/1004 , H04L1/22
摘要： An apparatus and method for ensuring the reliability of a protection trip of an intelligent substation. The apparatus comprises a main CPU and an auxiliary CPU connected together, and a main FPGA and an auxiliary FPGA connected together, wherein the main FPGA and the auxiliary FPGA are both connected to a physical layer of a protection apparatus, and the main CPU and the auxiliary CPU are both connected to a state monitoring data output end of a protected device. Wherein, the main CPU sending a processing result to the main FPGA, the auxiliary CPU sending the processing result to the auxiliary FPGA, and the auxiliary FPGA synchronizing current information with the main FPGA after receiving information sent by the auxiliary CPU; and when the main FPGA receives trip information, the main FPGA comparing the consistency of current trip information obtained from the main CPU with that of current trip information obtained from the auxiliary FPGA, and if the two are consistent, the main FPGA sending the information received from the main CPU to the protection apparatus, otherwise, discarding the information received from the main CPU. An anti-misoperation ability of a protection apparatus is improved, and it is ensured that the apparatus cannot cause misoperation of primary device due to unknown errors when a hardware device failure, single event upset (SEU), etc. happens.
-
-
-
-
-
-
-
-
-
搜索结果
120 条记录 (耗时 0.024 秒)
