-
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.
-
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.
-
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.
-
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
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.
-
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
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.
-
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
发明人： DING, Jiudong , LU, Yu , DONG, Yunlong , LI, Gang , HU, Zhaoqing
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.
-
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
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
-
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
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.
-
公开(公告)号：EP3595116A1
公开(公告)日：2020-01-15
申请号：EP18809522.8
申请日：2018-05-22
发明人： LU, Yu , LI, Gang , TIAN, Jie , WANG, Nannan , LI, Haiying , JIANG, Chongxue , SUI, Shunke
IPC分类号： H02H7/26
摘要： A fault switch configuration and clearing method in a flexible DC converter station, the flexible DC converter station is configured with a grid side switch (QF1) and a valve side phase-split switch (QF2) in the converter station. When a fault occurs, a faulty phase and a non-faulty phase are detected and identified by means of differential protection or low voltage overcurrent. An alternating current (AC) zero crossing condition is created by means of firstly turn off the non-faulty phase valve side phase- split switch (QF2) and the grid side switch (QF1), thereby cutting off the faulty phase, disconnecting the connection between a power supply and a fault point, and achieving the clearing for faults. The described fault-clearing method is simple and practical, highly reliable, and connection between the fault point and the power supply is quickly and effectively cut; converter station equipment is effectively protected, and further expansion of the fault is avoided.
-
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.
-
-
-
-
-
-
-
-
-
搜索结果
15 条记录 (耗时 0.017 秒)
