Patents by Inventor Dingxiang DU
Dingxiang DU 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: 11749985Abstract: A method and device for timing in time-varying distance protection based on multiple lines of a tower. The method includes: collecting an instantaneous current value at a time-varying distance protection installation location in the multiple lines of the tower, and acquiring preset parameters; calculating, according to the preset parameters and a multi-line ranging model, a multi-line ranging result; calculating, according to the preset parameters, the multi-line ranging result, and an adaptive calculation model, time of a section-II distance protection action and final time of a section-III distance protection action; and determining, according to the instantaneous current value, the preset parameters, and a cross-line failure auxiliary criterion model, final time of the section-II distance protection action.Type: GrantFiled: October 31, 2019Date of Patent: September 5, 2023Assignees: CHINA ELECTRIC POWER RESEARCH INSTITUTE, STATE GRID CORPORATION OF CHINAInventors: Zexin Zhou, Tianhua Li, Hong Cao, Yarong Guo, Xingguo Wang, Dingxiang Du, Delin Wang, Pengfei Lv, Zhi Zhang
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Patent number: 11742652Abstract: A method and device for starting direct-current (DC) transmission line protection, and a storage medium. The method includes: determining whether a sudden change of a DC line current at a present moment is greater than a sum of a memory start threshold and a maximum value in sudden changes of the DC line current within a time period preceding the present moment that is multiplied by a preset proportional coefficient, the time period being a time period between a moment preceding the present moment by a first duration and a moment preceding the present moment by a second duration; and starting DC transmission line protection in response to determining that the sudden change of the DC line current at the present moment is greater than the sum.Type: GrantFiled: August 13, 2019Date of Patent: August 29, 2023Assignees: CHINA ELECTRIC POWER RESEARCH INSTITUTE, STATE GRID CORPORATION OF CHINAInventors: Hong Cao, Zexin Zhou, Huanzhang Liu, Dingxiang Du, Xingguo Wang
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Publication number: 20220413031Abstract: A line double-end steady-state quantity distance measuring method and system based on an amplitude-comparison principle. According to the method and system, voltage values and current values of both sides of a line before and after a fault are collected (102), a voltage variable quantity and a current variable quantity of both sides of the line are calculated (103), and after a voltage phasor value and a current phasor value are determined according to the voltage variable quantity and the current variable quantity (104), the position of a short-circuit point is determined by performing iterative calculation on the voltage of the short-circuit point. The method is simple in principle, and can accurately recognize a fault point, achieving precise distance measurement of lines.Type: ApplicationFiled: July 8, 2020Publication date: December 29, 2022Inventors: Yarong GUO, Xingguo WANG, Zexin ZHOU, Ying LIANG, Guosheng YANG, Huanzhang LIU, Dingxiang DU, Yong LI, Shuyang WANG, Qi CHENG, Hong CAO, Zhengguang CHEN
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Publication number: 20220285931Abstract: Disclosed are a direct-current transmission line protection method and system based on pure current characteristics.Type: ApplicationFiled: June 18, 2020Publication date: September 8, 2022Applicants: CHINA ELECTRIC POWER RESEARCH INSTITUTE, STATE GRID CORPORATION OF CHINAInventors: Zexin ZHOU, Huanzhang LIU, Pengfei LV, Hong CAO, Xingguo WANG, Siye RUAN, Dingxiang DU, Yong LI, Guosheng YANG, Mingliang JIN
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Publication number: 20220239093Abstract: A method and device for timing in time-varying distance protection based on multiple lines of a tower. The method includes: collecting an instantaneous current value at a time-varying distance protection installation location in the multiple lines of the tower, and acquiring preset parameters; calculating, according to the preset parameters and a multi-line ranging model, a multi-line ranging result; calculating, according to the preset parameters, the multi-line ranging result, and an adaptive calculation model, time of a section-II distance protection action and final time of a section-III distance protection action; and determining, according to the instantaneous current value, the preset parameters, and a cross-line failure auxiliary criterion model, final time of the section-II distance protection action.Type: ApplicationFiled: October 31, 2019Publication date: July 28, 2022Applicants: CHINA ELECTRIC POWER RESEARCH INSTITUTE, STATE GRID CORPORATION OF CHINAInventors: Zexin ZHOU, Tianhua LI, Hong CAO, Yarong GUO, Xingguo WANG, Dingxiang DU, Delin WANG, Pengfei LV, Zhi ZHANG
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Publication number: 20220131367Abstract: A method and device for starting direct-current (DC) transmission line protection, and a storage medium. The method includes: determining whether a sudden change of a DC line current at a present moment is greater than a sum of a memory start threshold and a maximum value in sudden changes of the DC line current within a time period preceding the present moment that is multiplied by a preset proportional coefficient, the time period being a time period between a moment preceding the present moment by a first duration and a moment preceding the present moment by a second duration; and starting DC transmission line protection in response to determining that the sudden change of the DC line current at the present moment is greater than the sum.Type: ApplicationFiled: August 13, 2019Publication date: April 28, 2022Inventors: Hong CAO, Zexin ZHOU, Huanzhang LIU, Dingxiang DU, Xingguo WANG
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Patent number: 10985547Abstract: A current differential protection method for a self-adaptive half-wavelength line based on a time-difference method. Since an electrical distance of half-wavelength power transmission is long, after a fault occurs, there is an obvious time difference between the actuation times for protecting starting elements at two sides of a line. According to the principles of wave propagation, the position of a fault point can be determined by means of a difference between the actuation times for protecting the starting elements at the two sides of the line. By means of taking the fault point as a differential point, a current value at the differential point can be obtained according to a long line equation by means of the voltage and current at protection-mounted positions at the two sides of the line, and a differential current is then calculated.Type: GrantFiled: July 11, 2016Date of Patent: April 20, 2021Assignees: CHINA ELECTRIC POWER RESEARCH INSTITUTE COMPANY LIMITED, STATE GRID CORPORATION OF CHINA, CENTRAL CHINA BRANCH OF STATE GRID CORPORATION OF CHINAInventors: Xuming Liang, Yarong Guo, Huanzhang Liu, Xiao Li, Zexin Zhou, Dingxiang Du, Delin Wang, Jing Li, Huixin Li, Zhongqing Li
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Patent number: 10778003Abstract: A method of free wave energy protection for a half-wavelength line based on a one-sided current includes: performing sampling and calculation on a current at protection measuring points to obtain variations in current sampling values; and activating a protective element to determine an occurrence time of a fault in a half-wavelength line. A free wave energy protection section includes a quick-action section, a basic section and a sensitive section, wherein the quick-action section, the basic section and the sensitive section serve as action criteria for performing protection with respect to the free wave energy of the half-wavelength line.Type: GrantFiled: July 18, 2016Date of Patent: September 15, 2020Assignees: CHINA ELECTRIC POWER RESEARCH INST. CO. LIMITED, STATE GRID CORPORATION OF CHINA, STATE GRID CENTRAL CHINA GRID COMPANY LTD.Inventors: Huanzhang Liu, Zexin Zhou, Dingxiang Du, Yarong Guo, Xiao Li, Xuming Liang, Delin Wang, Xingguo Wang
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Patent number: 10605852Abstract: A concomitant impedance protection method for a half-wavelength power transmission line includes that: three-phase currents and three-phase voltages of a relay protection device mounting position at an M side and a relay protection device mounting position at an N side of the half-wavelength power transmission line are acquired respectively; it is judged whether starting amounts of an M side and an N side meet starting conditions or not; a failure point F is determined according to a time difference when the starting amounts of the M side and the N side meet the starting conditions; and a relay protection action of the half-wavelength power transmission line is started according to concomitant impedance of the half-wavelength power transmission line.Type: GrantFiled: June 30, 2016Date of Patent: March 31, 2020Assignees: CHINA ELECTRIC POWER RESEARCH INSTITUTE COMPANY LIMITED, STATE GRID CORPORATION OF CHINA, CENTRAL CHINA BRANCH OF STATE GRID CORPORATION OF CHINAInventors: Dingxiang Du, Huanzhang Liu, Zexin Zhou, Xuming Liang, Yarong Guo, Xingguo Wang, Lianhai Li, Delin Wang, Xiao Li, Xiangwen Chen
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Publication number: 20190013667Abstract: A method of free wave energy protection for a half-wavelength line based on a one-sided current includes: performing sampling and calculation on a current at protection measuring points to obtain variations in current sampling values; and activating a protective element to determine an occurrence time of a fault in a half-wavelength line. A free wave energy protection section includes a quick-action section, a basic section and a sensitive section, wherein the quick-action section, the basic section and the sensitive section serve as action criteria for performing protection with respect to the free wave energy of the half-wavelength line.Type: ApplicationFiled: July 18, 2016Publication date: January 10, 2019Inventors: Huanzhang Liu, Zexin Zhou, Dingxiang Du, Yarong Guo, Xiao Li, Xuming Liang, Delin Wang, Xingguo Wang
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Publication number: 20180375322Abstract: A current differential protection method for a self-adaptive half-wavelength line based on a time-difference method. Since an electrical distance of half-wavelength power transmission is long, after a fault occurs, there is an obvious time difference between the actuation times for protecting starting elements at two sides of a line. According to the principles of wave propagation, the position of a fault point can be determined by means of a difference between the actuation times for protecting the starting elements at the two sides of the line. By means of taking the fault point as a differential point, a current value at the differential point can be obtained according to a long line equation by means of the voltage and current at protection-mounted positions at the two sides of the line, and a differential current is then calculated.Type: ApplicationFiled: July 11, 2016Publication date: December 27, 2018Inventors: Xuming LIANG, Yarong GUO, Huanzhang LIU, Xiao LI, Zexin ZHOU, Dingxiang DU, Delin WANG, Jing LI, Huixin LI, Zhongqing LI
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Publication number: 20180364292Abstract: A concomitant impedance protection method for a half-wavelength power transmission line includes that: three-phase currents and three-phase voltages of a relay protection device mounting position at an M side and a relay protection device mounting position at an N side of the half-wavelength power transmission line are acquired respectively; it is judged whether starting amounts of an M side and an N side meet starting conditions or not; a failure point F is determined according to a time difference when the starting amounts of the M side and the N side meet the starting conditions; and a relay protection action of the half-wavelength power transmission line is started according to concomitant impedance of the half-wavelength power transmission line.Type: ApplicationFiled: June 30, 2016Publication date: December 20, 2018Applicants: CHINA ELECTRIC POWER RESEARCH INSTITUTE COMPANY LIMITED, STATE GRID CORPORATION OF CHINA, CENTRAL CHINA BRANCH OF STATE GRID CORPORATION OF CHINAInventors: Dingxiang Du, Huanzhang Liu, Zexin Zhou, Xuming Liang, Yarong Guo, Xingguo Wang, Lianhai Li, Delin Wang, Xiao Li, Xiangwen Chen
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Publication number: 20170317489Abstract: The invention provides a method for overcoming the influence of out-flowing current on bus differential protection. The method comprises the following steps: acquiring and processing branch current signals; selecting a fault bus, and determining the branch current with maximum amplitude from branches connected with the fault bus; calculating differential current and restraint current of a large differential element, and determining whether the large differential element acts. The method for overcoming the influence of out-flowing current on bus differential protection does not need to reduce the braking coefficient during splitting operation in a two-bus connecting mode, can adaptively improve the sensitivity of bus differential protection under an internal fault in the presence of out-flowing current, and simultaneously ensures the reliability under an external fault.Type: ApplicationFiled: August 24, 2015Publication date: November 2, 2017Applicants: STATE GRID CORPORATION OF CHINA, CHINA ELECTRIC POWER RESEARCH INSTITUTE, CENTER CHINA GRID COMPANY LIMITEDInventors: Dingxiang DU, Huanzhang LIU, Zexin ZHOU, Xingguo WANG