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1. 发明公开

EP3157122A4 LINE POWER CONTROL METHOD AND SYSTEM OF UNIFIED POWER FLOW CONTROLLER 审中-公开
标题翻译： LEITUNGSSTROMSTEUERUNGSVERFAHREN UND-SYSTEMS EINES VEREINHEITLICHTEN STROMFLUSSREGLERS
公开(公告)号：EP3157122A4
公开(公告)日：2017-07-26
申请号：EP15819677
申请日：2015-01-22
申请人： NR ELECTRIC CO LTD , NR ELECTRIC ENG CO LTD
发明人： TIAN JIE , PAN LEI , LIU CHAO , SHEN QUANRONG , LI HAIYING , LU YU , DONG YUNLONG
IPC分类号： H02J3/24
CPC分类号： G05B15/02 , H02J3/24 , H02J13/00
摘要： The present invention provides a line power control method and system for a unified power flow controller. The line power control method for a unified power flow controller includes outer loop line power control, inner loop valve side current control, and converter valve control. Series-side converter valve side current reference values I sedref and I seqref are calculated by means of the outer loop line power control according to line power instructions P ref and Q ref that are input, a measured line power U L , and measured line power P line and Q line ; a converter output voltage reference value U cref is calculated by means of the inner valve side current control according to the valve side current reference values that are output by means of the outer loop power control, a measured valve side current, and a measured valve side voltage; and finally, a converter outputs, according to the voltage reference value, a corresponding voltage to control line power to achieve a reference value. The control method is simple and practical, has high reliability, can rapidly and accurately control the line power, and can implement independent decoupling control of active power and reactive power of a line.
摘要翻译：本发明提供一种统一潮流控制器的线路功率控制方法和系统。统一潮流控制器的线路功率控制方法包括外环线功率控制，内环线阀侧电流控制和换流阀控制。根据输入的线路功率指令P ref和Q ref，测量的线路功率UL和测量的线路功率P，通过外部环路线路功率控制来计算串联侧转换器阀门侧电流基准值I sedref和I seqref 线和Q线; 根据借助于外环功率控制输出的阀侧电流参考值，测量的阀侧电流和测量的阀侧，通过内侧阀侧电流控制来计算转换器输出电压参考值U cref 电压; 最后，转换器根据电压参考值输出对应的电压，以控制线路功率达到参考值。该控制方法简单实用，可靠性高，能够快速，准确地控制线路功率，并可实现线路有功和无功的独立解耦控制。

2. 发明公开

EP3125394A4 UNIFIED POWER FLOW CONTROLLER FOR DOUBLE-CIRCUIT LINE 有权
标题翻译： VEREINHEITLICHTESLEISTUNGSFLUSSSTEUERGERÄTFÜRDOPPELSCHALTUNGSLEITUNG
公开(公告)号：EP3125394A4
公开(公告)日：2017-04-26
申请号：EP15796511
申请日：2015-01-12
申请人： NR ELECTRIC CO LTD , NR ELECTRIC ENG CO LTD
发明人： TIAN JIE , LI HAIYING , WANG XINBAO , DONG YUNLONG , SHEN QUANRONG , PAN LEI , LIU CHAO , CHANG BAOLI
IPC分类号： H02J3/18
CPC分类号： H02J3/14 , H02J3/16 , H02J3/1814 , H02J3/46 , Y02E40/18
摘要： An unified power flow controller for a double-circuit transmission line comprises at least one parallel-connection transformer (1), three current converters (4), at least two series-connection transformers (8), a parallel-connection side switching circuit (3), a series-connection side switching circuit (6) and a direct current common bus (5). At least one side of the series-connection transformers is connected with at least one group of by-pass switches (9, 10) in parallel. The alternating current sides of the three current converters are connected to each loop line in series after being connected with at least one series-connection transformer through the series-connection side switching circuit (6). The alternating current sides of the three current converters are connected to an alternating current system after connected with at least one parallel-connection transformer (1) through a parallel-connection side switching circuit starting circuit (2). The direct current sides of the three current converters are connected to the direct current common bus (5) through a transfer switch. With the unified power flow controller, various operating modes can be realized, and when one current converter is in fault, power flow control of the double-circuit transmission line can still be achieved. The unified power flow controller is small in occupied space, low in cost, and excellent in economy, flexibility and reliability.
摘要翻译：一种用于双回路传输线的统一潮流控制器包括至少一个并联变压器（1），三个电流转换器（4），至少两个串联变压器（8），并联连接侧开关电路 3），串联侧开关电路（6）和直流公共母线（5）。串联变压器的至少一侧并联至少一组旁路开关（9,10）。三个电流变换器的交流侧通过串联侧切换电路（6）与至少一个串联连接的变压器相连后，串联在每个环路线上。三个电流转换器的交流侧通过并联连接侧开关电路启动电路（2）与至少一个并联变压器（1）连接后，连接交流电系统。三个电流转换器的直流侧通过转换开关连接到直流公共母线（5）。通过统一的功率流量控制器，可以实现各种工作模式，当一个变流器出现故障时，仍然可以实现双回线路的功率控制。统一的功率流量控制器占用空间小，成本低，经济性，灵活性和可靠性好。

3. 发明公开

EP3007294A4 DIFFERENTIAL PROTECTION METHOD FOR CURRENT SOURCE CONVERTER, AND RELAY PROTECTION DEVICE 有权
标题翻译：相关人员的不同寻常者
公开(公告)号：EP3007294A4
公开(公告)日：2017-01-25
申请号：EP14804991
申请日：2014-04-14
申请人： NR ELECTRIC CO LTD , NR ENG CO LTD
发明人： ZHANG QIXUE , CHEN JUN , YAN WEI , SHI XIANGJIAN , YAN WEI , LIU WEIQUN , SHEN QUANRONG , WANG GUANG
IPC分类号： H02H3/30 , H02H7/12 , H02M1/32 , H02M7/04
CPC分类号： H02M1/32 , H02H3/305 , H02H3/307 , H02H7/1216 , H02M7/04

4. 发明公开

EP3223383A4 STARTING METHOD AND STOPPING METHOD FOR STATIC SYNCHRONOUS SERIES COMPENSATOR 有权
公开(公告)号：EP3223383A4
公开(公告)日：2018-01-17
申请号：EP15830207
申请日：2015-08-04
申请人： NR ELECTRIC CO LTD , NR ENG CO LTD
发明人： PAN LEI , TIAN JIE , SHEN QUANRONG , WANG XINBAO , LU YU , DONG YUNLONG , CHANG BAOLI
IPC分类号： H02J3/18 , H02M1/36
CPC分类号： H02J3/00 , H02J3/1807 , H02M1/36 , Y02E40/10
摘要： A starting and stopping method for a static synchronous series compensator (SSSC) is provided. A starting process includes: first, connecting a converter (4) to a shunt transformer (2), and closing an incoming line switch (1) of the shunt transformer to charge the current converter until a direct-current voltage is stable; then, opening the incoming line switch of the shunt transformer, and connecting the converter to a series transformer (5) through a change-over switch (3); deblocking the converter, and controlling a current of a bypass switch (6) of the series transformer to approach zero; further, opening the bypass switch of the series transformer, and enabling the converter to enter a normal operation mode after a line is stable; and in stopping the SSSC, first, switching a control mode of the converter to make the current of the bypass switch approaches zero when closed the bypass switch, then controlling a current of the series transformer to be gradually reduced to zero to make the series transformer out of service, and then blocking the converter. By means of the method, an overvoltage and an overcurrent of a converter when a series transformer is put into use and exits can be effectively suppressed, and current oscillation of an line and impact on the series transformer can be reduced, thereby achieving stable starting and stopping of an SSSC

5. 发明公开

EP2897243A4 FREQUENCY-CONVERSION DIFFERENTIAL PROTECTION METHOD FOR OUTPUT TRANSFORMER OF STATIC FREQUENCY CONVERTOR SYSTEM 有权
标题翻译：程序变频差动保护的静态变频系统的变压器输出
公开(公告)号：EP2897243A4
公开(公告)日：2016-05-25
申请号：EP13837802
申请日：2013-07-01
申请人： NR ELECTRIC CO LTD , NR ENGINEERING CO LTD
发明人： CHEN JUN , SHEN QUANRONG , YAN WEI , WANG HUIMIN , WANG KAI , LI HUAZHONG
IPC分类号： H02H7/045
CPC分类号： H02H7/045
摘要： In a frequency-conversion differential protection method for an output transformer of a static frequency converter (SFC) system, a protection device measures the three-phase current on each side of the output transformer of the SFC system; according to the connection manner of the output transformer, triangle side is used as a reference to perform phase correction on the star side; at the same time, in consideration of the secondary rated current on each side of the transformer are different, a balance coefficient on each side is adjusted, to calculate sampling values of correcting current on each side and the differential current; a generatorstart-up and shutdown protection algorithm which unaffected by frequency is used to calculate amplitude values of the correcting current, the differential current, and the restraint current; and frequency-conversion differential protection for the output transformer is implemented by using biased differential characteristic and according to magnitudes of the differential current and the restraint current. The protection method adapts to a large-scale frequency change, and compared with instantaneous overcurrent protection, greatly improves the sensitivity of detection on an internal fault of the output transformer.

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