Patents by Inventor Defeng QIU
Defeng QIU 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).
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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
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Patent number: 10763761Abstract: A sub-module based hybrid converter is provided. By setting a half-controlled charging link of changing full bridge sub-modules from a blocked state to a half-blocked state one by one in a charging process, and raising the voltages of half bridge sub-modules to reach the starting point of a half bridge sub-module based self-powered supply in an uncontrolled stage of the half bridge sub-modules, the starting point of the sub-module based self-powered supply is increased, and the design difficulty of the sub-module based self- powered supply is reduced. The present invention also includes another charging method for a sub-module based hybrid converter.Type: GrantFiled: January 12, 2018Date of Patent: September 1, 2020Assignees: NR ELECTRIC CO., LTD., NR ENGINEERING CO., LTDInventors: Jiudong Ding, Yu Lu, Yunlong Dong, Haiying Li, Jie Tian, Defeng Qiu, Tiangui Jiang, Jianyang Lian
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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
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Publication number: 20200076321Abstract: The present invention discloses a charging method for a sub-module based hybrid converter. By setting a half-controlled charging link of changing full bridge sub-modules from a blocked state to a half-blocked state one by one in a charging process, and raising the voltages of half bridge sub-modules to reach the starting point of a half bridge sub-module based self-powered supply in an uncontrolled stage of the half bridge sub-modules, the starting point of the sub-module based self-powered supply is increased, and the design difficulty of the sub-module based self-powered supply is reduced. The present invention also discloses another charging method for a sub-module based hybrid converter. The above objective can also be achieved by setting a half-controlled charging link of changing the full bridge sub-modules from a blocked state to a bypassed state one by one in the charging process.Type: ApplicationFiled: January 12, 2018Publication date: March 5, 2020Applicants: NR ELECTRIC CO., LTD, NR ENGINEERING CO., LTDInventors: Jiudong DING, Yu LU, Yunlong DONG, Haiying LI, Jie TIAN, Defeng QIU, Tiangui JIANG, Jianyang LIAN
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Patent number: 10483788Abstract: The present invention discloses a charging method for a sub-module based hybrid converter. By setting a half-controlled charging link of half-blocking all full bridge sub-modules in a charging process, and raising the voltages of half bridge sub-modules to reach the starting point of a half bridge sub-module based self-powered supply in an uncontrolled stage of the half bridge sub-modules, the starting point of the sub-module based self-powered supply is increased, and the design difficulty of the sub-module based self-powered supply is reduced. The present invention also discloses another charging method for a sub-module based hybrid converter. The above objective can also be achieved by setting a half-controlled charging link of bypassing all full bridge sub-modules in the charging process.Type: GrantFiled: January 12, 2018Date of Patent: November 19, 2019Assignees: NR ELECTRIC CO., LTD, NR ENGINEERING CO., LTDInventors: Jiudong Ding, Yu Lu, Yunlong Dong, Haiying Li, Jie Tian, Defeng Qiu, Tiangui Jiang, Jianyang Lian
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Publication number: 20190326770Abstract: The present invention discloses a charging method for a sub-module based hybrid converter. By setting a half-controlled charging link of half-blocking all full bridge sub-modules in a charging process, and raising the voltages of half bridge sub-modules to reach the starting point of a half bridge sub-module based self-powered supply in an uncontrolled stage of the half bridge sub-modules, the starting point of the sub-module based self-powered supply is increased, and the design difficulty of the sub-module based self-powered supply is reduced. The present invention also discloses another charging method for a sub-module based hybrid converter. The above objective can also be achieved by setting a half-controlled charging link of bypassing all full bridge sub-modules in the charging process.Type: ApplicationFiled: January 12, 2018Publication date: October 24, 2019Applicants: NR ELECTRIC CO., LTD, NR ENGINEERING CO., LTDInventors: Jiudong DING, Yu LU, Yunlong DONG, Haiying LI, Jie TIAN, Defeng QIU, Tiangui JIANG, Jianyang LIAN
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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
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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