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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
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
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.
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2.发明公开
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
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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3.发明公开
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
发明人： LI, Gang , LI, Haiying , LU, Yu , DONG, Yunlong , WANG, Xianrong , ZOU, Kaikai , LI, Jianchun , HU, Xianlai
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.
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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
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.
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