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1.发明申请公开(公告)号：US20200295563A1
公开(公告)日：2020-09-17
申请号：US16767922
申请日：2018-11-28
发明人： Jiang LU , Yu LU , Yunlong DONG , Yongping WANG , Jie TIAN , Nannan WANG , Wenqiang ZHAO , Zhaoqing HU , Ke WANG , Jianmin XIAO
IPC分类号： H02J1/08
摘要： Disclosed in the present invention is a voltage and current control method for a direct-current transmission system. The method comprises: calculating a DC voltage reference value of a voltage source converter of a DC voltage control end, on the basis whether a direct-current voltage end of a direct-current pole of a direct-current transmission system substantially controls a direct-current voltage; using ½ of the calculated direct-current voltage reference value of the voltage source converter as a bridge arm voltage direct-current bias, calculating a difference between the direct-current voltage reference value of the voltage source converter and a measured direct-current voltage value, and inputting the difference into a direct-current voltage control outer loop of the voltage source converter to perform closed-loop control, so as to control the direct-current voltage or the direct current of the direct-current pole. Correspondingly, also provided is a voltage and current control device for the direct-current transmission system. By the means of the present invention, the direct-current voltage and the direct current of the direct-current transmission system provided with the voltage source converter can be effectively controlled.
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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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3.发明申请公开(公告)号：US20200185901A1
公开(公告)日：2020-06-11
申请号：US16617124
申请日：2018-05-22
发明人： Lei PAN , Jie TIAN , Yunlong Dong , Yu LU , Ruhai HUANG , Chongxue JIANG , Jiang LU , Baoshun ZHANG , Defeng QIU , Hua XIE
摘要： A method and apparatus for suppressing the impact of a compensator on line distance protection is provided, wherein the method comprises: obtaining a first current of a line connected to a compensator or series converters in the compensator, and a first voltage of a bus connected to the compensator or the line connected to the compensator; exiting the series converters and series transformers if the first current is greater than a preset current threshold and a duration is greater than a first preset time threshold; exiting the series converters and the series transformers if the first voltage is less than or equal to a preset voltage threshold and duration is greater than a second preset time threshold set the output voltage of the series converters to zero, and if a second current of an element corresponding to the first current meets conditions which the first current needs to meet; and otherwise, canceling the setting of the output voltage of the series converters to zero and obtaining a first current if a second voltage of the line corresponding to the first voltage is greater than the preset voltage threshold and the duration is greater than a third preset time threshold.
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公开(公告)号：US20190157871A1
公开(公告)日：2019-05-23
申请号：US16319300
申请日：2017-08-15
发明人： Ruhai HUANG , Yu LU , Yunlong DONG , Lei PAN , Defeng QIU , Chongxue JIANG , Jiang LU , Gang LI , Zhaoqing HU , Nannan WANG , Jiudong DING , Ke WANG , Xianlai HU , Hui WANG , Shunke SUI
CPC分类号： H02J3/36 , H02J3/00 , H02J3/1807 , H02J3/1814 , H02M7/7575
摘要： A series compensation device suitable to double-circuit lines is disclosed. The device includes one series transformer and one converter. One converter and dual-circuit transmission lines are respectively connected to three windings of one series transformer. In the solution provided in the present application, the device can be independently installed in a power transmission system to be used as a static synchronous series compensator, and can also be used as a component of a unified power flow controller, a convertible static compensator, an interline power flow controller and a unified power quality conditioner to be connected to a power transmission system device in series. The device can save the capacity of a converter, improve the application efficiency of the series compensation device, and reduce the cost and area occupation.
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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：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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公开(公告)号：US20190052087A1
公开(公告)日：2019-02-14
申请号：US16079967
申请日：2017-01-19
发明人： Wenqiang ZHAO , Nannan WANG , Yongping WANG , Jiang LU , Chuanjun BAI , Yu LU
摘要： A method and apparatus for controlling a hybrid direct-current (DC) transmission system. The method comprises: adjusting the total number of inserted sub-modules of a modular multi-level converter and the polarity of an output level of the inserted sub-modules in real time, according to a DC voltage of a rectifier station at other end; or adjusting the total number of inserted sub-modules of a modular multi-level converter and the polarity of an output level of the inserted sub-modules in real time, according to the magnitude of a DC current or DC power; or adjusting the total number of inserted sub-modules of a modular multi-level converter and the polarity of an output level of the inserted sub-modules in real time, according to both the magnitude of the DC current and the DC voltage of the rectifier station at the other end. The method can effectively control the DC voltage and the direct current of a hybrid DC transmission system, avoiding the power transmitting breakdown.
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