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1. 发明公开

EP3051653A4 METHOD AND APPARATUS FOR CONTROLLING DIRECT-CURRENT VOLTAGE 有权转让
标题翻译：方法和设备用以控制DC电压
公开(公告)号：EP3051653A4
公开(公告)日：2017-03-15
申请号：EP14846869
申请日：2014-09-25
申请人： NR ELECTRIC CO LTD , NR ENG CO LTD
发明人： DONG YUNLONG , TIAN JIE , LI HAIYING , CAO DONGMING
IPC分类号： H02J3/36
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, including: determining, when it is determined that a DC voltage primary control station loses a DC voltage control function, whether the DC voltage primary control station can communicate with the DC voltage secondary control station, and if yes, sending, by the DC voltage primary control station, information about the DC voltage primary control station losing the DC voltage control function to the at least one DC voltage secondary control station and enabling a DC voltage control function of one DC voltage secondary control station, so as to adjust a DC voltage; before the DC voltage control function of the DC voltage secondary control station is enabled, if the DC voltage exceeds an operation range, enabling, by the at least one DC voltage secondary control station, a DC voltage auxiliary control function, so as to adjust emitted or absorbed active power; and when the DC voltage primary control station cannot communicate with all of or some of the at least one DC voltage secondary control station, and if the DC voltage exceeds the operation range, enabling, by at least one DC voltage secondary control station, a DC voltage auxiliary control function, so as to adjust current emitted or absorbed active power, and determining, according to a policy, one DC voltage secondary control station to enable a DC voltage control function, so as to adjust the DC voltage. 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:

2. 发明公开

EP3145071A4 VOLTAGE-SOURCE MULTI-LEVEL CONVERTER, DIRECT-CURRENT POWER TRANSMISSION SYSTEM AND FAULT PROCESSING METHOD AND DEVICE 有权
公开(公告)号：EP3145071A4
公开(公告)日：2018-01-17
申请号：EP15788904
申请日：2015-02-05
申请人： NR ELECTRIC CO LTD , NR ENG CO LTD
发明人： SHEN GUORONG , TIAN JIE , CAO DONGMING , LI HAIYING , DONG YUNLONG , WANG NANNAN , LIU HAIBIN , LU YU
IPC分类号： H02J3/36 , H01H9/50 , H02J1/00 , H02M7/483
CPC分类号： H02J1/00 , H02H9/04 , H02J3/36 , H02M1/32 , H02M7/483 , H02M2007/4835
摘要： A voltage-source multi-level converter, including a phase unit (0). The phase unit (0) includes a first bridge arm (100) and a second bridge arm (200), where a first terminal of the first bridge arm (100) is a first DC terminal (P) of the phase unit (0), and a first terminal of the second bridge arm (200) is a second DC terminal (N) of the phase unit (0); a second terminal of the first bridge arm (100) and a second terminal of the second bridge arm (200) are shorted together, as an alternating-current terminal (A) of the phase unit (0); the first bridge arm (100) includes first modules (101) and one first reactor (102) connected in series, where a first terminal of the first reactor (102) is connected to the alternating-current terminal (A), a second terminal (X1) thereof is connected to a first terminal of the first modules (101), and a second terminal of the first modules (101) is connected to the first DC terminal (P); the second bridge arm (200) includes second modules (201) and one second reactor (202) connected in series, where a first terminal of the second reactor (202) is connected to the alternating-current terminal (A), a second terminal (X2) thereof is connected to a first terminal of the second modules (201), and a second terminal of the second modules (201) is connected to the second DC terminal (N); and a parallel fault shunt circuit (300) is connected between the second terminals (X1, X2) of the first reactor (102) and the second reactor (202). Also disclosed are a DC power transmission system and a fault processing method and device.

3. 发明公开

EP3211741A4 METHOD FOR INHIBITING MULTIPLE CONVERTER STATIONS INTO PASSIVE CONTROL MODE IN ISLAND STATE 审中-公开
公开(公告)号：EP3211741A4
公开(公告)日：2017-12-06
申请号：EP15868517
申请日：2015-11-24
申请人： NR ELECTRIC CO LTD , NR ENG CO LTD
发明人： DONG YUNLONG , TIAN JIE , CAO DONGMING , LI HAIYING , DING JIUDONG , HU ZHAOQING , LI GANG , LIU HAIBIN , LU YU
IPC分类号： H02J3/00 , H02J1/10 , H02J3/38
CPC分类号： H02J3/46 , H02J1/10 , H02J3/00 , H02J3/005 , H02J3/36 , H02J3/38 , H02J2003/001 , H02J2003/388
摘要： The present invention provides a method for inhibiting multiple inverter stations from entering a passive control mode in an island state. The method includes dividing inverter stations into groups in advance; a principle for group division is dividing inverter stations whose alternating-current sides are connected to each other through an alternating-current line in a normal running condition into a group; priorities of the inverter stations are preset in each group to tune relevant fixed values of the inverter stations for island detection; a tuning principle is that an inverter station with a higher priority has a more sensitive relevant fixed value, and an island state is more easily detected for the corresponding inverter station; an inverter station for which an island state is detected can enter a passive control mode only when all the other inverter stations with priorities higher than the priority of the inverter station in the group send enabling signals.

4. 发明公开

EP3232555A4 SUB-MODULE DISTRIBUTED CONTROL METHOD, DEVICE AND SYSTEM 审中-公开
公开(公告)号：EP3232555A4
公开(公告)日：2018-05-23
申请号：EP15866788
申请日：2015-10-28
申请人： NR ELECTRIC CO LTD , NR ENG CO LTD
发明人： DING JIUDONG , TIAN JIE , DONG YUNLONG , LI HAIYING , CAO DONGMING , LIU HAIBIN , LU YU
IPC分类号： H02M7/00 , H02M1/00 , H02M1/32 , H02M7/483
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.

5. 发明公开

EP3211743A4 ISLAND-TO-NETWORK SWITCHING METHOD 审中-公开
公开(公告)号：EP3211743A4
公开(公告)日：2018-01-24
申请号：EP15871856
申请日：2015-12-09
申请人： NR ELECTRIC CO LTD , NR ENG CO LTD
发明人： DONG YUNLONG , TIAN JIE , HU ZHAOQING , LI HAIYING , CAO DONGMING , LIU HAIBIN , LU YU
IPC分类号： H02J3/36 , H02J3/38
CPC分类号： H02J3/36 , H02J3/38 , Y02E60/60
摘要： The present invention discloses a passive islanding to grid-connection switching method for a VSC HVDC transmission system. When the VSC HVDC transmission system in an island operation state, whether the VSC HVDC transmission system enters a grid-connection state is determined by detecting whether an overcurrent phenomenon has occurred in a converter valve-side three-phase alternating-current or a converter bridge arm current, and detecting a change status of an alternating-current side voltage. The system is controlled to switch from an island operation control mode to a grid-connection control mode. At a moment of switching, the online control mode is smoothly switched to by changing a power instruction and performing phase tracking on a current grid voltage, so that continuous operation of the system is maintained.

6. 发明公开

EP2999103A4 SUB-MODULE, PROTECTION UNIT, CONVERTER, AND CONTROL METHOD THEREOF 有权转让
标题翻译：超音速，SCHUTZEINHEIT，WANDLER UND STEUERUNGSVERFAHRENDAFÜR
公开(公告)号：EP2999103A4
公开(公告)日：2017-03-22
申请号：EP14797222
申请日：2014-05-05
申请人： NR ELECTRIC CO LTD , NR ENG CO LTD
发明人： DONG YUNLONG , CAO DONGMING , TIAN JIE , LI HAIYING , WANG NANNAN
IPC分类号： H02M1/32 , H02M7/483
CPC分类号： H02M1/32 , H02M2007/4835
摘要： Disclosed are a sub-module structure formed of an energy storage element, a first turn-off device, a second turn-off device, a third turn-off device, a freewheeling diode, a series resistor, and diodes respectively in antiparallel connection with the turn-off devices, and a converter completely or partially formed of the sub-modules. Also disclosed are a relevant protection unit and a control method for the converter. The converter can be locked when a direct current (DC) fault occurs to prevent an alternating current (AC) system from injecting a fault current into a DC network, so that a transient fault of the DC network can be removed without tripping an AC line switch, thereby rapidly restarting the system. A charging resistor is comprised in the sub-module so that a charging resistor disposed at an AC side of the converter can be reduced and even may not be dispose.
摘要翻译：公开了一种子模块结构，其分别与能量存储元件，第一关断装置，第二关断装置，第三关断装置，续流二极管，串联电阻器和二极管分别反向并联连接关断装置和由子模块完全或部分地形成的转换器。还公开了用于转换器的相关保护单元和控制方法。当直流（DC）故障发生时，转换器可以锁定，以防止交流（AC）系统将故障电流注入直流网络，从而可以消除直流网络的瞬态故障而不跳闸交流线路切换，从而快速重启系统。在子模块中包括充电电阻器，从而可以减少设置在转换器的AC侧的充电电阻器，甚至可以不配置。

7. 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。

8. 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。

9. 发明公开

EP3113311A4 DIRECT-CURRENT TRANSMISSION PROTECTION APPARATUS, CURRENT CONVERTER, AND PROTECTION METHOD 审中-公开
标题翻译： GLEICHSTROMÜBERTRAGUNGSSCHUTZVORRICHTUNG，STROMWANDLER UND SCHUTZVERFAHREN
公开(公告)号：EP3113311A4
公开(公告)日：2017-10-04
申请号：EP14883640
申请日：2014-05-04
申请人： NR ELECTRIC CO LTD , NR ELECTRIC ENG CO LTD
发明人： CAO DONGMING , XIE YEYUAN , SHAO ZHENXIA , LU YU , LI MIN , LU HAIBIN , LI HAIYING
IPC分类号： H02H3/087 , H02H7/10 , H02H7/122 , H02H7/125 , H02H7/127 , H02M1/32 , H02M7/217 , H02M7/483 , H05K7/20
CPC分类号： H02H3/202 , H02H7/10 , H02H7/1227 , H02H7/1252 , H02H7/1257 , H02H7/127 , H02M1/32 , H02M7/2173 , H02M2007/4835 , H05K7/20927
摘要： The present invention discloses a direct-current power transmission protection device, including a resistor unit and a bidirectional circulation current switch unit, and the resistor unit and the bidirectional circulation current switch unit being connected in parallel to form the protection device, where at least one resistor is cascaded to form the resistor unit, and at least one bidirectional circulation current switch is cascaded to form the bidirectional circulation current switch unit. In addition, the present invention also provides a converter including the protection device, and at least one protection device is connected in series in each phase unit. The present invention provides the protection device, the converter and a protection method for flexible direct-current power transmission, which can rapidly and effectively suppress direct-current short circuit current and damp current oscillation, and not only can better protect equipment safety, but also can greatly shorten fault current attenuation time, thus shortening direct-current shutdown time and further decreasing economic loss and system destabilization risk caused by shutdown to the max. Moreover, the protection device is structurally simple and low in cost, and has good implementability and economic efficiency.
摘要翻译：本发明公开了一种直流输电保护装置，包括电阻单元和双向环流开关单元，所述电阻单元和所述双向环流开关单元并联连接形成保护装置，其中至少一个电阻串联形成电阻单元，至少一个双向环流开关级联形成双向环流开关单元。此外，本发明还提供一种包括保护装置的转换器，并且每个相位单元中至少一个保护装置串联连接。本发明提供了一种能够快速有效抑制直流短路电流和潮湿电流振荡的柔性直流输电保护装置，变流器及保护方法，不仅能够更好地保护设备的安全，而且可以大大缩短故障电流衰减时间，缩短直流关机时间，进一步降低关机造成的经济损失和系统失稳风险。而且，该保护装置结构简单，成本低廉，具有良好的可实施性和经济性。

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