Patents by Inventor Chongxue JIANG
Chongxue JIANG has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Patent number: 11374411Abstract: 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.Type: GrantFiled: October 23, 2018Date of Patent: June 28, 2022Assignees: NR ELECTRIC CO., LTD, NR ENGINEERING CO., LTDInventors: Jiacheng Wang, Yu Lu, Nannan Wang, Zhaoqing Hu, Yunlong Dong, Gang Li, Chongxue Jiang
-
Patent number: 11355932Abstract: Disclosed are a control method and system for a parallel converter system, including a common AC voltage controller and a separate current controller for each converter; the AC voltage controller generates an active current, a wattless current, and a system voltage phase reference value and, by means of communication, sends same to the current controller of each converter in island control mode to be a converter control signal; the active and wattless current outputted by each converter, along with the corresponding current reference value, accomplish the objective of the parallel converter system collectively controlling the amplitude and frequency of an AC bus voltage. The method and system are highly reliable and effectively ensure the synchronization of a plurality of converters.Type: GrantFiled: May 22, 2018Date of Patent: June 7, 2022Assignees: NR ELECTRIC CO., LTD, NR ENGINEERING CO., LTDInventors: Nannan Wang, Yu Lu, Yunlong Dong, Jie Tian, Chongxue Jiang, Jiacheng Wang, Gang Li, Jiudong Ding, Haiying Li
-
Patent number: 11190020Abstract: A DC voltage coordination control method is applied to a multi-terminal VSC-HVDC power transmission system or a VSC-HVDC power grid system. When a lower-level control is used in the active power control mode, the active power reference value of the converter is generated according to the converter DC voltage and the converter DC voltage active power curve; it also includes an upper-level control to adjust the control mode and active power setting value of the lower-level control to ensure the steady-state performance of the system. This method has low dependence on communication, avoids the problem that the fixed slope and margin cannot meet all operating conditions, and is suitable for large-scale VSC-HVDC systems, and has scalability.Type: GrantFiled: May 7, 2018Date of Patent: November 30, 2021Assignees: NR ELECTRIC CO., LTD, NR ENGINEERING CO., LTDInventors: Nannan Wang, Yu Lu, Yunlong Dong, Jie Tian, Dongming Cao, Haiying Li, Chongxue Jiang, Jiacheng Wang
-
Publication number: 20210222673Abstract: 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.Type: ApplicationFiled: October 23, 2018Publication date: July 22, 2021Inventors: Jiacheng Wang, Yu Lu, Nannan Wang, Zhaoqing Hu, Yunlong Dong, Gang Li, Chongxue Jiang
-
Patent number: 10965114Abstract: A method and apparatus for suppressing the impact of a compensator on line distance protection is provided, wherein the method comprises: obtaining a first current of a line connected to a compensator or series converters in the compensator, and a first voltage of a bus connected to the compensator or the line connected to the compensator; exiting the series converters and series transformers if the first current is greater than a preset current threshold and a duration is greater than a first preset time threshold; exiting the series converters and the series transformers if the first voltage is less than or equal to a preset voltage threshold and duration is greater than a second preset time threshold set the output voltage of the series converters to zero, and if a second current of an element corresponding to the first current meets conditions which the first current needs to meet; and otherwise, canceling the setting of the output voltage of the series converters to zero and obtaining a first current ifType: GrantFiled: May 22, 2018Date of Patent: March 30, 2021Assignees: NR ELECTRIC CO., LTD., NR ENGINEERING CO., LTD.Inventors: Lei Pan, Jie Tian, Yunlong Dong, Yu Lu, Ruhai Huang, Chongxue Jiang, Jiang Lu, Baoshun Zhang, Defeng Qiu, Hua Xie
-
Patent number: 10923906Abstract: 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 and a valve side phase-split switch 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 zero crossing condition is created by means of firstly turn off the non-faulty phase valve side phase-split switch and the grid side switch, 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.Type: GrantFiled: May 22, 2018Date of Patent: February 16, 2021Assignees: NR ELECTRIC CO., LTD., NR ENGINEERING CO., LTD.Inventors: Yu Lu, Gang Li, Jie Tian, Nannan Wang, Haiying Li, Chongxue Jiang, Shunke Sui
-
Publication number: 20200366096Abstract: A DC voltage coordination control method is applied to a multi-terminal VSC-HVDC power transmission system or a VSC-HVDC power grid system. When a lower-level control is used in the active power control mode, the active power reference value of the converter is generated according to the converter DC voltage and the converter DC voltage active power curve; it also includes an upper-level control to adjust the control mode and active power setting value of the lower-level control to ensure the steady-state performance of the system. This method has low dependence on communication, avoids the problem that the fixed slope and margin cannot meet all operating conditions, and is suitable for large-scale VSC-HVDC systems, and has scalability.Type: ApplicationFiled: May 7, 2018Publication date: November 19, 2020Applicants: NR ELECTRIC CO., LTD, NR ENGINEERING CO., LTDInventors: Nannan WANG, Yu LU, Yunlong DONG, Jie TIAN, Dongming CAO, Haiying LI, Chongxue JIANG, Jiacheng WANG
-
Publication number: 20200220349Abstract: 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 and a valve side phase-split switch 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 zero crossing condition is created by means of firstly turn off the non-faulty phase valve side phase-split switch and the grid side switch, 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.Type: ApplicationFiled: May 22, 2018Publication date: July 9, 2020Applicants: NR ELECTRIC CO., LTD, NR ENGINEERING CO., LTDInventors: Yu LU, Gang LI, Jie TIAN, Nannan WANG, Haiying LI, Chongxue JIANG, Shunke SUI
-
Publication number: 20200212674Abstract: Disclosed are a control method and system for a parallel converter system, including a common AC voltage controller and a separate current controller for each converter; the AC voltage controller generates an active current, a wattless current, and a system voltage phase reference value and, by means of communication, sends same to the current controller of each converter in island control mode to be a converter control signal; the active and wattless current outputted by each converter, along with the corresponding current reference value, accomplish the objective of the parallel converter system collectively controlling the amplitude and frequency of an AC bus voltage. The method and system are highly reliable and effectively ensure the synchronization of a plurality of converters.Type: ApplicationFiled: May 22, 2018Publication date: July 2, 2020Inventors: Nannan WANG, Yu LU, Yunlong DONG, Jie TIAN, Chongxue JIANG, Jiacheng WANG, Gang LI, Jiudong DING, Haiying LI
-
Publication number: 20200185901Abstract: A method and apparatus for suppressing the impact of a compensator on line distance protection is provided, wherein the method comprises: obtaining a first current of a line connected to a compensator or series converters in the compensator, and a first voltage of a bus connected to the compensator or the line connected to the compensator; exiting the series converters and series transformers if the first current is greater than a preset current threshold and a duration is greater than a first preset time threshold; exiting the series converters and the series transformers if the first voltage is less than or equal to a preset voltage threshold and duration is greater than a second preset time threshold set the output voltage of the series converters to zero, and if a second current of an element corresponding to the first current meets conditions which the first current needs to meet; and otherwise, canceling the setting of the output voltage of the series converters to zero and obtaining a first current ifType: ApplicationFiled: May 22, 2018Publication date: June 11, 2020Applicants: NR Electric Co., Ltd., NR Engineering Co., Ltd.Inventors: Lei PAN, Jie TIAN, Yunlong Dong, Yu LU, Ruhai HUANG, Chongxue JIANG, Jiang LU, Baoshun ZHANG, Defeng QIU, Hua XIE
-
Patent number: 10396562Abstract: 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.Type: GrantFiled: August 15, 2017Date of Patent: August 27, 2019Assignees: NR ELECTRIC CO., LTD, NR ENGINEERING CO., LTDInventors: Ruhai Huang, Yu Lu, Yunlong Dong, Lei Pan, Defeng Qiu, Chongxue Jiang, Jiang Lu, Gang Li, Zhaoqing Hu, Nannan Wang, Jiudong Ding, Ke Wang, Xianlai Hu, Hui Wang, Shunke Sui
-
Publication number: 20190157871Abstract: 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.Type: ApplicationFiled: August 15, 2017Publication date: May 23, 2019Applicants: NR Electric Co., Ltd, NR Engineering Co., LtdInventors: Ruhai HUANG, Yu LU, Yunlong DONG, Lei PAN, Defeng QIU, Chongxue JIANG, Jiang LU, Gang LI, Zhaoqing HU, Nannan WANG, Jiudong DING, Ke WANG, Xianlai HU, Hui WANG, Shunke SUI