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1.发明公开
公开(公告)号：EP3618212A1
公开(公告)日：2020-03-04
申请号：EP18806444.8
申请日：2018-05-22
发明人： PAN, Lei , TIAN, Jie , DONG, Yunlong , LU, Yu , HUANG, Ruhai , JIANG, Chongxue , LU, Jiang , ZHANG, Baoshun , QIU, Defeng , XIE, Hua
IPC分类号： H02H7/26
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：EP3480913A1
公开(公告)日：2019-05-08
申请号：EP17841031.2
申请日：2017-08-15
发明人： HUANG, Ruhai , LU, Yu , DONG, Yunlong , PAN, Lei , QIU, Defeng , JIANG, Chongxue , LU, Jiang , LI, Gang , HU, Zhaoqing , WANG, Nannan , DING, Jiudong , WANG, Ke , HU, Xianlai , WANG, Hui , SUI, Shunke
IPC分类号： H02J3/00
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：EP3703214A1
公开(公告)日：2020-09-02
申请号：EP18870538.8
申请日：2018-10-23
发明人： WANG, Jiacheng , LU, Yu , WANG, Nannan , HU, Zhaoqing , DONG, Yunlong , LI, Gang , JIANG, Chongxue
IPC分类号： H02J3/38
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.
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公开(公告)号：EP3595116A1
公开(公告)日：2020-01-15
申请号：EP18809522.8
申请日：2018-05-22
发明人： LU, Yu , LI, Gang , TIAN, Jie , WANG, Nannan , LI, Haiying , JIANG, Chongxue , SUI, Shunke
IPC分类号： H02H7/26
摘要： A fault switch configuration and clearing method in a flexible DC converter station, the flexible DC converter station is configured with a grid side switch (QF1) and a valve side phase-split switch (QF2) in the converter station. When a fault occurs, a faulty phase and a non-faulty phase are detected and identified by means of differential protection or low voltage overcurrent. An alternating current (AC) zero crossing condition is created by means of firstly turn off the non-faulty phase valve side phase- split switch (QF2) and the grid side switch (QF1), thereby cutting off the faulty phase, disconnecting the connection between a power supply and a fault point, and achieving the clearing for faults. The described fault-clearing method is simple and practical, highly reliable, and connection between the fault point and the power supply is quickly and effectively cut; converter station equipment is effectively protected, and further expansion of the fault is avoided.
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