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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

EP4290721A1 METHOD AND APPARATUS FOR HANDLING DIRECT-CURRENT SIDE LINE FAULT OF VOLTAGE SOURCE CONVERTER 审中-实审
公开(公告)号：EP4290721A1
公开(公告)日：2023-12-13
申请号：EP22749146.1
申请日：2022-01-29
申请人： NR ELECTRIC CO., LTD. , NR Engineering Co., Ltd.
发明人： LU, Jiang , DONG, Yunlong , YU, Xiang , YANG, Jianming , WANG, Yangzheng , LU, Yu , TIAN, Jie , LI, Haiying , QIU, Defeng , HUANG, Ruhai
IPC分类号： H02H7/26 , H02J3/36
摘要： The invention provide a method and device for handling a DC-side line fault of a voltage source converter, wherein the voltage source converter is arranged at a rectifier end or an inverter end of any DC pole of a DC transmission system, and the rectifier end and the inverter end are connected through a DC line. The fault handling method comprises: acquiring a normal value of a DC voltage reference value of the voltage source converter; setting a DC current limiting target value of the voltage source converter; acquiring a DC current limiting control output value based on a DC current measured value and the DC current limiting target value; setting a DC voltage reference value of the voltage source converter based on the normal value of the DC voltage reference value and the DC current limiting control output value; setting the DC current limiting target value to be zero when a DC side line fault is detected; and rising the DC voltage reference value of the voltage source converter in response to end of de-ionization, and changing the DC current limit target value of the voltage source converter.

3. 发明公开

EP3232555A1 SUB-MODULE DISTRIBUTED CONTROL METHOD, DEVICE AND SYSTEM 有权
标题翻译：子模块分布式控制方法，装置和系统
公开(公告)号：EP3232555A1
公开(公告)日：2017-10-18
申请号：EP15866788.1
申请日：2015-10-28
申请人： NR Electric Co., Ltd. , NR Engineering 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
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.
摘要翻译：提供了一种子模块分布式控制方法，装置和系统。每个桥臂的子模块被分组。每个组对应一个阀门控制器。上层控制装置根据桥臂电流，各组正常子模块的平均电压以及各组正常子模块的数量计算各组的权重; 根据要在相应的桥臂中输入的子模块的数量来计算在每个组中输入的子模块的数量，并将该数量传递给基于阀门的控制器。基于阀的控制器根据现有技术中提供的电压平衡策略和门控方法进行操作。

4. 发明公开

EP4362261A1 CONVERTER CONTROL METHOD AND CONTROL SYSTEM, COMPUTER DEVICE, AND STORAGE MEDIUM 审中-实审
公开(公告)号：EP4362261A1
公开(公告)日：2024-05-01
申请号：EP22848484.6
申请日：2022-07-25
申请人： NR Electric Co., Ltd , NR Engineering Co., Ltd. , NR Electric Power Electronics Co., Ltd.
发明人： WANG, Nannan , TIAN, Jie , LU, Yu , DONG, Yunlong , ZHAN, Changjiang , LI, Haiying , WANG, Xinbao , ZOU, Kaikai , WANG, Xianrong , YIN, Zihan , MA, Xiuda
IPC分类号： H02J3/16 , H02J3/18
CPC分类号： Y02E60/60 , H02J3/40 , H02J3/36 , H02M1/32 , H02M1/00 , H02M7/797 , H02J3/50 , H02J3/16 , H02J3/18
摘要： This application provides a control method and a control system for a converter, and a computer device, applied to a flexible direct-current power transmission system. The flexible direct-current power transmission system includes one or more voltage source converters, and the control method includes: determining an inner potential of the converter, a phase, a grid-side voltage, a grid-side current of the converter, a constant impedance value, and a current limiting value of the converter; calculating a voltage reference value of a connection bus of the converter according to the inner potential, the phase, the constant impedance value, and the grid-side current of the converter; calculating a current instruction reference value according to an error between the voltage reference value of the connection bus and the grid-side voltage; and controlling, according to the current instruction reference value, a current of the converter to follow the current instruction reference value. The control method further includes an overcurrent limiting unit, and when the converter is in an instruction current-limiting mode, a current instruction reference value in the instruction current-limiting mode is calculated according to series inductance characteristics of a positive sequence voltage source and according to the grid-side voltage Us, the inner potential amplitude E, the phase θ, and the current limiting value Imax of the converter, and is used as the current instruction reference value.

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

EP3890174A1 CONVERTER APPARATUS AND ASSEMBLY, REACTIVE POWER COMPENSATION APPARATUS, AND CONVERTER THEREOF, AND CONTROL METHOD THEREFOR 审中-实审
公开(公告)号：EP3890174A1
公开(公告)日：2021-10-06
申请号：EP20858070.4
申请日：2020-06-30
申请人： NR ELECTRIC CO., LTD. , NR Engineering Co., Ltd.
发明人： ZHAN, Changjiang , WANG, Tao , YU, Xiaoyang , PAN, Lei , SHAO, Zhenxia , JIAO, Xinyan , LU, Yu , DONG, Yunlong
IPC分类号： H02M1/32
摘要： A converter apparatus, an assembly of converter apparatuses, a reactive power compensation apparatus, a converter and a method for controlling the converter are disclosed. The converter apparatus (1000) comprises: a switch unit (U1), comprising a first controllable semiconductor device (Q1) and a second controllable semiconductor device (Q2) connected in series; a capacitor (C1) connected to the switch unit (U1) in parallel; and an energy-consuming voltage-equalizing unit (U2) connected with the capacitor (C1) in parallel, and comprising a first resistor (R1), a second resistor (R2) and a third controllable semiconductor device (Q3), wherein the first resistor (R1) and the second resistor (R2) are connected in series, and the third controllable semiconductor device (Q3) is connected with the first resistor (R1) in parallel.

7. 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

8. 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.

9. 发明公开

EP3145071A1 VOLTAGE-SOURCE MULTI-LEVEL CONVERTER, DIRECT-CURRENT POWER TRANSMISSION SYSTEM AND FAULT PROCESSING METHOD AND DEVICE 有权
标题翻译：多电平电压源逆变器，DC输电系统和故障处理方法和装置
公开(公告)号：EP3145071A1
公开(公告)日：2017-03-22
申请号：EP15788904.9
申请日：2015-02-05
申请人： NR Electric Co., Ltd. , NR Engineering 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： H02M7/483 , H02J3/36
CPC分类号： H02J1/00 , 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.
摘要翻译：一种电压源多电平变换器，还包括一个相位单元（0）。相位单元（0）包括：第一桥臂（100）和第二桥臂（200），其中所述第一桥臂（100）的第一端子是相位单元的第一直流端子（P）（0）和第二桥臂（200）的第一端子是相位单元（0）的第二直流端子（N）; 第一桥臂（100）和所述第二桥臂（200）的第二端子的第二端子被短接在一起，如在相位单元（0）的交流端子（A）; 第一桥臂（100）包括串联连接的，其中所述第一反应器（102）的第一端子被连接到交流输出端子（A）第一模块（101）和一个第一反应器（102），第二端子（X1）被连接到所述第一模块（101）的第一端子，并且所述第一模块（101）的第二端子连接到所述第一DC端子（P）; 第二桥臂（200）包括串联连接的，其中所述第二反应器（202）的第一端子被连接到交流输出端子（A）第二模块（201）和一个第二反应器（202），第二端子（X2）被连接到所述第二模块（201）的第一端子，和第二模块（201）的第二端子连接到所述第二DC端子（N）; 和并联故障分流电路（300）被连接在第一反应器（102）和第二反应器（202）的第二端（X1，X2）之间。所以圆盘游离缺失是DC输电系统和故障处理方法及装置。

10. 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.

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