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公开(公告)号：US11050239B2
公开(公告)日：2021-06-29
申请号：US16418105
申请日：2019-05-21
Applicant: ABB Power Grids Switzerland AG
Inventor： Kai Liu , Jianping Wang , Youyi Li
Abstract: A method for detecting fault direction of a transmission line of an AC power system and a control system using the same. The method includes sampling current values and voltage values at one end of the transmission line for a series of time points; computing instantaneous voltage values at compensated point on the transmission line from the current value samples and the voltage value samples based on a time domain lumped parameter differential equation for the transmission line for the series of time points; recording the current value samples and the computed instantaneous voltage values at the compensated point; computing at least one voltage fault component each using the recorded computed instantaneous voltage values for at least the at least two of the series of time points; identifying the fault direction in consideration of the at least one computed voltage fault component and the at least one computed current fault component; and generating a fault direction signal indicating the identified fault direction. Where a fault directional element is designed using the voltage fault components at the compensated point, it will work well for the AC power system with strong power source.
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公开(公告)号：US11022655B2
公开(公告)日：2021-06-01
申请号：US16174701
申请日：2018-10-30
Applicant: ABB Power Grids Switzerland AG
Inventor： Kai Liu , Jianping Wang , Youyi Li
Abstract: A method, control system and protective relay are provided for detecting faulted phases of transmission lines in an AC power system. The method includes sampling electric signals at one end of the transmission lines at a series of time points; computing instantaneous voltage values of electric signals at compensated points on the transmission lines from the values of the sampled electric signals based on a time domain lumped parameter differential equation for the transmission lines for the series of time points; recording the computed instantaneous voltage values of the electric signals; computing fault component or sudden-change of the instantaneous voltage values of the electrical signals; detecting the faulted phases or fault types by comparing the calculated fault component of the instantaneous voltage values at the preset compensated points; and generating signals indicating the faulted phases of fault types.
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公开(公告)号：US10734803B2
公开(公告)日：2020-08-04
申请号：US15574390
申请日：2015-05-26
Applicant: ABB Power Grids Switzerland AG
Inventor： YouYi Li , Kai Liu , Jianping Wang
Abstract: There is provided mechanisms for travelling wave protection of a transmission line. A method includes performing high-pass filtering of a current and/or voltage measurement of a transmission line so as to detect fault-caused high-frequency components of the current and/or voltage measurement. The method includes providing a result of the high-pass filtering as input to a trip decision maker performing travelling wave detection.
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Patent Agency Ranking
公开(公告)号：US11112445B2
公开(公告)日：2021-09-07
申请号：US15570493
申请日：2015-05-28
Applicant: ABB Power Grids Switzerland AG
Inventor： YouYi Li , Jianping Wang , Kai Liu
IPC: G01R31/08 , G01R31/327 , H02H7/26
Abstract: A mechanism for travelling wave pilot protection of a transmission line and method for receiving indications of a travelling wave from two terminals of a transmission line, wherein two terminals are time synchronized. The method includes making a trip decision based on the indications using a short trip window. An arrangement is configured to perform the disclosed method.
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公开(公告)号：US11016136B2
公开(公告)日：2021-05-25
申请号：US16440207
申请日：2019-06-13
Applicant: ABB Power Grids Switzerland AG
Inventor： Kai Liu
Abstract: A method for detecting fault direction of transmission line of an AC power system and control system using the same. The method includes: sampling current values and voltage values of three phases at one end of the transmission line for a series of time points; for each of the series of time points, computing instantaneous symmetrical voltage components of the three phases based on the voltage value samples for the respective one of the series of time points; for each of the series of time points, computing instantaneous symmetrical current components of the three phases based on the current value samples for the respective one of the series of time points; for at least two of the series of time points, calculating energy directional elements each based on the respective ones of the computed instantaneous symmetrical voltage components and the respective ones of the computed instantaneous symmetrical current components; identifying the fault direction in consideration of the calculated energy directional elements; and generating a fault direction signal indicating the identified fault direction. Simulation results show the graph of the energy directional element calculated based on instantaneous symmetrical voltage components and instantaneous symmetrical current components exhibits distinctive characteristics either for forward or reverse fault. In consideration of such difference, by calculating the energy directional element at each sampling time point, the fault direction information may be identified accurately.
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公开(公告)号：US11277006B2
公开(公告)日：2022-03-15
申请号：US17298264
申请日：2018-11-28
Applicant: ABB Power Grids Switzerland AG
Inventor： Xing Huang , ChunMing Yuan , XiaoBo Yang , HaiLian Xie , Kai Liu
Abstract: Embodiments of present disclosure relates to a modular interconnection device (MID) and an electrical network system. The MID comprises a modular port assembly, a node, a converter and a local controller. The modular port assembly is configured to transmit alternating current and/or direct current. The node is coupled to an AC source via a first switch and the modular port assembly. The first switch is configured to selectively disconnect the modular interconnection device from the AC source. The converter is coupled to the node via a second switch and coupled to a DC source via a third switch. The converter is configured to convert the AC current into DC current or convert DC current into AC current. The local controller is coupled to the first, second and third switches and configured to control operation of the first, second and third switches.
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公开(公告)号：US20210391717A1
公开(公告)日：2021-12-16
申请号：US17298264
申请日：2018-11-28
Applicant: ABB Power Grids Switzerland AG
Inventor： Xing Huang , ChunMing Yuan , XiaoBo Yang , HaiLian Xie , Kai Liu
Abstract: Embodiments of present disclosure relates to a modular interconnection device (MID) and an electrical network system. The MID comprises a modular port assembly, a node, a converter and a local controller. The modular port assembly is configured to transmit alternating current and/or direct current. The node is coupled to an AC source via a first switch and the modular port assembly. The first switch is configured to selectively disconnect the modular interconnection device from the AC source. The converter is coupled to the node via a second switch and coupled to a DC source via a third switch. The converter is configured to convert the AC current into DC current or convert DC current into AC current. The local controller is coupled to the first, second and third switches and configured to control operation of the first, second and third switches.
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公开(公告)号：US20200335967A1
公开(公告)日：2020-10-22
申请号：US16956348
申请日：2017-12-20
Applicant: ABB Power Grids Switzerland AG
Inventor： YouYi Li , Kai Liu , Jianping Wang
Abstract: There is provided mechanisms for zero sequence differential protection of a transmission line of a power system. An arrangement comprises a zero sequence differential protection unit configured for, using current measurements of each phase A, B, C of the transmission line, internal fault detection of the transmission line. The arrangement comprises a phase selection unit configured for, using a comparison of differential values of the current measures for each phase, determination of whether any of the phases A, B, C of the transmission line is faulty or not. A trip is caused by the zero sequence differential protection unit when an internal fault is detected by the zero sequence differential protection unit, and the trip starts all the phases A, B, C for the phase selection unit to finalize the trip for said any faulty phase.
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