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1. 发明公开

EP4227692A1 MODULAR BATCH ENERGY ACQUISITION AND COMMUTATION CIRCUIT AND CONTROL METHOD 审中-实审
公开(公告)号：EP4227692A1
公开(公告)日：2023-08-16
申请号：EP22739003.6
申请日：2022-01-11
申请人： NR ELECTRIC CO., LTD. , NR Engineering Co., Ltd.
发明人： XIE, Yeyuan , WANG, Yu , YAO, Hongyang , JIANG, Tiangui , ZHU, Minglian , OUYANG, Youpeng , HU, Zhaoqing , LI, Haiying , YIN, Guanxian , DUAN, Jun , REN, Tieqiang
IPC分类号： G01R31/14 , G01R31/52
摘要： Disclosed are a modular converter circuit featuring batch energy harvesting, and a control method. The modular converter circuit featuring batch energy harvesting comprises a batch energy harvesting unit and N sub-modules, wherein AC terminals of the N sub-modules are connected in series, and N is an integer greater than or equal to 2. The sub-module comprises: a power unit (1) comprising a power semiconductor device, an AC terminal of the power unit (1) being led out as the AC terminal of the sub-module; and a capacitor unit (2) connected in parallel with the power unit (1). The batch energy harvesting unit comprises: a first energy harvesting power supply (6), a negative electrode of the first energy harvesting power supply (6) being connected with a negative electrode of the capacitor unit (2) of a head-end sub-module among the N sub-modules or connected therewith through a current limiting unit; and a connection network (30), an input terminal of the connection network (30) being directly connected with a positive electrode of the first energy harvesting power supply (6) or connected therewith through a current limiting unit, and N output terminals of the connection network (30) being respectively connected with positive electrodes of the capacitor units (2) or connected therewith through current limiting units.

2. 发明公开

EP3480913A1 SERIES COMPENSATION DEVICE APPLICABLE TO DOUBLE-CIRCUIT LINE 有权
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
申请人： NR Electric Co., Ltd. , NR Engineering Co., Ltd.
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.

3. 发明授权

EP3211743B1 ISLAND-TO-NETWORK SWITCHING METHOD 有权
公开(公告)号：EP3211743B1
公开(公告)日：2019-10-09
申请号：EP15871856.9
申请日：2015-12-09
申请人： NR Electric Co., Ltd. , NR Engineering 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 , H02H7/122

4. 发明公开

EP3419136A1 DIRECT CURRENT POWER GRID VOLTAGE CONTROL METHOD 有权
公开(公告)号：EP3419136A1
公开(公告)日：2018-12-26
申请号：EP17773236.9
申请日：2017-03-29
申请人： NR Electric Co., Ltd. , NR Engineering Co., Ltd
发明人： DING, Jiudong , LU, Yu , DONG, Yunlong , LI, Gang , HU, Zhaoqing
IPC分类号： H02J1/00 , H02J1/14
CPC分类号： H02J1/00 , H02J1/14
摘要： Provided in the present invention is a direct current power grid voltage control method, dividing control of a direct current power grid voltage into three processes, namely natural voltage regulation, first voltage regulation and second voltage regulation; the converter stations in the direct current power grid are divided into three types, namely power regulation converter stations, auxiliary voltage regulation converter stations, and voltage regulation converter stations, on the basis of whether the converter station has a voltage regulation capacity, the power regulation converter stations operating in a fixed power control mode, the voltage regulation converter stations operating in a fixed voltage control mode or an auxiliary voltage control mode, and the auxiliary voltage control converter stations operating in the auxiliary voltage control mode; all the converter stations in the direct current power grid participate in natural voltage regulation, the auxiliary voltage regulation converter stations and the voltage regulation converter stations participate in first voltage regulation, and the voltage regulation converter stations participate in second voltage regulation; by means of a combination of the three voltage regulation processes, accurate control of the direct current voltage can be implemented in a steady state, and direct current voltage change can be suppressed in a transient state.

5. 发明授权

EP3419138B1 METHOD AND SYSTEM FOR FAULT POSITIONING AND RECOVERY OF VOLTAGE SOURCE CONVERTER 有权
公开(公告)号：EP3419138B1
公开(公告)日：2020-10-28
申请号：EP17792434.7
申请日：2017-04-25
申请人： NR Electric Co., Ltd. , NR Engineering Co., Ltd.
发明人： LI, Gang , LU, Yu , HU, Zhaoqing , TIAN, Jie , DONG, Yunlong , JIANG, Tiangui , LI, Haiying , FENG, Yadong , WANG, Ke , LU, Jiang , SUI, Shunke , WANG, Hui , WANG, Nannan
IPC分类号： H02J3/36 , H02H7/26 , H02H3/06

6. 发明公开

EP3703214A1 CONVERTER CONTROL METHOD AND DEVICE 有权
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
申请人： NR Electric Co., Ltd. , NR Engineering Co., Ltd.
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.

7. 发明公开

EP3477844A1 RECONFIGURABLE MMC SUB-MODULE UNIT AND CONTROL UNIT THEREOF 有权
公开(公告)号：EP3477844A1
公开(公告)日：2019-05-01
申请号：EP17836389.1
申请日：2017-08-02
申请人： NR Electric Co., Ltd. , NR Engineering Co., Ltd.
发明人： LI, Gang , LI, Jianchun , TIAN, Jie , LI, Haiying , LU, Yu , DONG, Yunlong , HU, Zhaoqing , ZHU, Minglian
IPC分类号： H02M7/483
摘要： A reconfigurable MMC sub-module unit and a control unit thereof are provided, the reconfigurable MMC sub-module unit is mainly formed by an MMC sub-module unit and a reconfigurable mechanism, wherein the reconfigurable mechanism is formed by switches, and the conversion of MMC sub-module unit topology is achieved through switching on and off the switches in the reconfigurable mechanism. According to the reconfigurable MMC sub-module unit and the control unit thereof, the rapid change of a topology structure for a converter can be achieved, which is suitable for the demand of the line connection of the medium-voltage power distribution network and variable topologies, and meets requirements of dynamic simulation experiment for different converter topologies in the dynamic simulation experiment, thereby reducing construction costs and duration, improving experiment efficiency, and having high flexibility and strong versatility.

8. 发明公开

EP4184742A1 FLEXIBLE DIRECT-CURRENT TRANSMISSION LINE DISCHARGING METHOD AND APPARATUS, AND STORAGE MEDIUM 审中-实审
公开(公告)号：EP4184742A1
公开(公告)日：2023-05-24
申请号：EP21866072.8
申请日：2021-09-10
申请人： NR ELECTRIC CO., LTD. , NR Engineering Co., Ltd.
发明人： ZHAN, Changjiang , HU, Zhaoqing , SHAO, Zhenxia , LI, Gang , DONG, Yunlong , LU, Yu
IPC分类号： H02J3/36
摘要： The application provides a discharge method and device for a voltage sourced converter direct-current transmission line and a storage medium. The method comprises: unlocking a converter valve; generating an additional control signal by an additional controller and superimposing the additional control signal on a reference voltage output by a main controller of the voltage sourced converter direct-current transmission system, so that the converter valve generates a harmonic current in a three-phase bridge arm of a converter; and when a direct-current transmission line voltage is lower than a voltage setting or an average voltage of normal operating submodules in the converter bridge arm is lower than a submodule operating voltage setting, locking the converter.

9. 发明公开

EP3681006A1 VOLTAGE AND CURRENT CONTROL METHOD AND DEVICE FOR DIRECT-CURRENT POWER TRANSMISSION SYSTEM 有权
公开(公告)号：EP3681006A1
公开(公告)日：2020-07-15
申请号：EP18885604.1
申请日：2018-11-28
申请人： NR Electric Co., Ltd. , NR Engineering Co., Ltd.
发明人： LU, Jiang , LU, Yu , DONG, Yunlong , WANG, Yongping , TIAN, Jie , WANG, Nannan , ZHAO, Wenqiang , HU, Zhaoqing , WANG, Ke , XIAO, Jianmin
IPC分类号： H02J3/36
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 1/2 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.

10. 发明公开

EP3618215A1 METHOD FOR INITIATING FLEXIBLE DC TRANSMISSION SYSTEM UNDER ISOLATED ISLAND CONDITION 审中-实审转让
公开(公告)号：EP3618215A1
公开(公告)日：2020-03-04
申请号：EP18790888.4
申请日：2018-04-27
申请人： NR Electric Co., Ltd. , NR Engineering Co., Ltd
发明人： WANG, Ke , SUI, Shunke , LU, Yu , DONG, Yunlong , HU, Zhaoqing , LI, Gang
IPC分类号： H02J3/36
摘要： Disclosed in the present application is a method for initiating a flexible DC transmission system under an isolated island condition. When no AC power supply is present in an AC grid region connected to a flexible DC converter station, the flexible DC converter station needs to initiate and operate in an isolated island mode. The isolated island mode uses dual closed-loop control, wherein an outer loop controls the amplitude and frequency of the output voltage and an inner loop controls the output current. 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 U x and rapidly increases to U a kV at a rate of a kV/s, so as to avoid the problem that when an output voltage reference wave is too small, the error and harmonic content of a sampled voltage and current are too high, resulting in an adverse effect on the control system; and a second segment increases to U b kV at a rate of β kV/s, a third segment increases to U c kV at a rate of γ kV/s, ..., and the N th segment increases to a rated voltage of U N 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.

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