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1. 发明公开

EP4372949A1 CONVERTER CONTROL SYSTEM AND METHOD 审中-实审
公开(公告)号：EP4372949A1
公开(公告)日：2024-05-22
申请号：EP22914682.4
申请日：2022-12-26
申请人： NR Electric Co., Ltd , NR Engineering Co., Ltd.
发明人： WANG, Nannan , LU, Yu , DONG, Yunlong , TIAN, Jie , ZHAN, Changjiang , LI, Haiying , LI, Gang , WANG, Xianrong , LIN, Yizhe , LI, Jianchun
IPC分类号： H02J3/38
CPC分类号： Y02E60/60 , H02J3/46 , H02J3/38 , H02M1/08
摘要： The present application provides a converter control system and method for controlling a converter to mimic a synchronous generator. The converter control system comprises a power synchronization control unit, an alternating voltage reference vector calculation unit and an alternating voltage command generation unit. The power synchronization control unit is configured to mimic simulating a speed controller and a mechanical inertia link of a synchronous generator to generate a reference phase; the alternating voltage reference vector calculation unit acquires an internal potential vector and an alternating voltage vector to generate an alternating voltage reference vector; and the alternating voltage command generation unit generates a three-phase alternating voltage control command according to the alternating voltage reference vector and the reference phase. The converter control system and method provided by the present application can reduce the risk of oscillations without using current closed-loop control under steady-state and small perturbation conditions, and mimic grid support characteristics consistent with synchronous generators in both a steady state and a transient state, while realizing active adjustment of the impedance of the converter and improving grid adaptability.

2. 发明公开

EP4130764A1 TEST SYSTEM AND TEST METHOD FOR CONVERTER STATION IN FLEXIBLE DIRECT CURRENT TRANSMISSION 审中-实审
公开(公告)号：EP4130764A1
公开(公告)日：2023-02-08
申请号：EP21781686.7
申请日：2021-04-02
申请人： NR ELECTRIC CO., LTD. , NR Engineering Co., Ltd.
发明人： LI, Gang , TIAN, Jie , LI, Haiying , LU, Yu , DONG, Yunlong , ZOU, Kaikai , LI, Jianchun , WANG, Xianrong , ZHAN, Changjiang , HU, Xianlai
IPC分类号： G01R31/00
摘要： Disclosed are a test system (2000, 3000, 4000, 5000, 8000, 9000) and a test method for a flexible DC transmission converter station (200). The test system (2000, 3000, 4000, 5000, 8000, 9000) comprises: a test power supply (2100) at a test site; a voltage transforming device connected to the test power supply (2100) through a low-voltage AC switch (2200); a equipment of converter valve and DC field (260) connected to the voltage transforming device; and a resistor assembly (2400) connected between the test power supply (2100) and the voltage transforming device, or between the voltage transforming device and the equipment of converter valve and DC field (260), and comprising a resistor (2410) and a resistor parallel switch (2420) connected in parallel with the resistor (2410). The voltage transforming device may be a three-winding interconnecting transformer (230), or a voltage transforming device comprising a two-winding interconnecting transformer (230), a station transformer (220) and an AC bus (210). The test system makes full use of existing equipment of an offshore converter station (200), and can complete a high-voltage test of the offshore converter station (200) by means of a low-voltage incoming line of an onshore installation test site, without the need of building a test platform.

3. 发明公开

EP4047774A1 CONTROL SYSTEM OF DIRECT-CURRENT ENERGY CONSUMPTION DEVICE AND CONTROL METHOD THEREFOR 审中-公开
公开(公告)号：EP4047774A1
公开(公告)日：2022-08-24
申请号：EP20885012.3
申请日：2020-09-08
申请人： NR Engineering Co., Ltd. , NR ELECTRIC CO., LTD.
发明人： LI, Gang , LI, Haiying , LU, Yu , DONG, Yunlong , WANG, Xianrong , ZOU, Kaikai , LI, Jianchun , HU, Xianlai
IPC分类号： H02J3/36 , H02J3/12
摘要： The present invention discloses a DC control system and a control method for a DC chopper apparatus. The system includes a VSC-HVDC control and protection system and a DC chopper apparatus control system. The method includes the following steps: collecting, by the VSC-HVDC control and protection system, AC and DC signals and a device operating status of a VSC-HVDC transmission system, and transmitting a DC chopper enable/disable instruction and a surplus power to the DC chopper apparatus control system when an AC system fails and an enable/disable condition is satisfied; when the communication is normal, contributing, by the DC chopper apparatus control system, a chopping power according to the DC chopper enable/disable instruction and the surplus power value transmitted from the VSC-HVDC control and protection system and a status of the DC chopper apparatus; and when the communication is abnormal, contributing, by the DC chopper apparatus control system according to a DC voltage and a current signal collected by the DC chopper apparatus control system, a chopping power when needed. By means of the technical solution, the required chopping power can be accurately contributed according to different fault types and the communication status of the control system, to stably control the DC voltage during the failure, thereby improving the stability and the reliability of the power transmission system.

4. 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.

5. 发明公开

EP4283816A1 CONTROL METHOD AND SYSTEM FOR ISLAND OPERATION OF VSC-HVDC SYSTEM 审中-实审
公开(公告)号：EP4283816A1
公开(公告)日：2023-11-29
申请号：EP22742160.9
申请日：2022-01-18
申请人： NR Electric Co., Ltd. , NR Engineering Co., Ltd.
发明人： LI, Gang , LU, Yu , TIAN, Jie , DONG, Yunlong , LI, Haiying , WANG, Ke , YIN, Zihan , XIAO, Shilei
IPC分类号： H02J3/38
摘要： The application provides a control method for island operation of a VSC-HVDC transmission system, which comprises the following steps: during the island operation of the VSC-HVDC transmission system, implementing startup and steady-state operation of a converter in an open-loop control mode in a startup state; when a fault of an AC system is detected, switching the converter from the open-loop control mode to a double closed-loop control mode to limit fault current and suppress interference; in a non-fault state, operating in an adaptive island control mode; or, in the non-fault state, implementing the steady-state operation of the converter in the open-loop control mode. When the AC system fails, the double closed-loop control mode is adopted to limit fault current and suppress interference; and during the island operation, by automatically switching to a mode without inner loop current control, the system can be stabilized because there is no negative resistance caused by delay such as sampling control, and medium-high frequency oscillation caused by introducing a negative resistance component in closed-loop control can be avoided, thus providing a better solution for large-scale new energy access.

6. 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.

7. 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.

8. 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.

9. 发明授权

EP3211741B1 METHOD FOR INHIBITING MULTIPLE CONVERTER STATIONS INTO PASSIVE CONTROL MODE IN ISLAND STATE 有权
公开(公告)号：EP3211741B1
公开(公告)日：2019-04-10
申请号：EP15868517.2
申请日：2015-11-24
申请人： NR Electric Co., Ltd. , NR Engineering 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 , H02J3/38 , H02J1/10

10. 发明公开

EP3419138A1 METHOD AND SYSTEM FOR FAULT POSITIONING AND RECOVERY OF VOLTAGE SOURCE CONVERTER 有权
公开(公告)号：EP3419138A1
公开(公告)日：2018-12-26
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
摘要： The present invention relates to a method and system for fault positioning and recovery of a voltage source converter. The method comprises: 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; and recovering the operation of each station after the fault is positioned. The method for fault positioning and recovery is simple and 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 the fact that the zero sequence voltage of the alternating-current side is transmitted by a voltage source converter to an opposite-side alternating-current system; meanwhile, by means of the recovery method, a non-faulty converter station can get rid of the influences of a faulty converter station for rapid recovery, rapid recovery based on a voltage source converter station system is implemented, and the application of a transformerless wiring method in the voltage source converter can be promoted, thereby finally achieving that the occupied space of a converter station is reduced, losses are reduced, and manufacture costs are reduced.

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