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1. 发明授权

US11863082B2 Power converter and control method therefor 有权
公开(公告)号：US11863082B2
公开(公告)日：2024-01-02
申请号：US17427807
申请日：2019-05-06
申请人： ABB SCHWEIZ AG
发明人： Xiaobo Yang , Kai Liu , Chunming Yuan , Hailian Xie , Xing Huang
IPC分类号： H02M5/40 , H02M5/458 , H02M1/32 , G01R31/08 , H02H3/44 , H02M1/084
CPC分类号： H02M5/4585 , G01R31/08 , H02H3/44 , H02M1/325 , H02M1/084
摘要： A power converter includes a power conversion circuit having a first terminal set and a second terminal set, configured to convert power input via one of the first terminal set and the second terminal set and output the converted power via the other of the first terminal set and the second terminal set; a measurement unit; a controller configured to control the power conversion circuit to generate a voltage/current waveform travelling along the first network with a power supplied by a second power source linked to the second terminal set of the power conversion circuit in response to a condition that a change rate of the measurement of the voltage/current exceeds a threshold; and locate a fault on the first network. The power conversion circuit can be re-used for different modes of operation either for power transmission under normal condition or for fault location under fault condition.

2. 发明公开

US20230236235A1 METHOD OF DETERMINING LINE FAULT OF POWER SYSTEM 审中-公开
公开(公告)号：US20230236235A1
公开(公告)日：2023-07-27
申请号：US18000058
申请日：2020-08-11
申请人： ABB Schweiz AG
发明人： Kai Liu , Qi Zhang
IPC分类号： G01R31/08 , G01R25/00 , H02H7/22 , H02H1/00
CPC分类号： G01R31/085 , G01R25/005 , H02H7/226 , H02H1/0007
摘要： Methods for determining a line fault of a power system. The methods include obtaining sampled values of voltages and currents of phases of a power line in the power system, determining a phase compensation voltage of a first phase and an interphase compensation voltage of an interphase loop between a second phase and a third phase, and detecting the line fault in the first phase and/or the interphase loop by comparing the phase compensation voltage and the interphase compensation voltage.

3. 发明申请

US20220123662A1 POWER CONVERTER AND CONTROL METHOD THEREFOR 有权
公开(公告)号：US20220123662A1
公开(公告)日：2022-04-21
申请号：US17427807
申请日：2019-05-06
申请人： ABB SCHWEIZ AG
发明人： Xiaobo Yang , Kai Liu , Chunming Yuan , Hailian Xie , Xing Huang
IPC分类号： H02M5/458 , H02M1/32
摘要： A power converter includes a power conversion circuit having a first terminal set and a second terminal set, configured to convert power input via one of the first terminal set and the second terminal set and output the converted power via the other of the first terminal set and the second terminal set; a measurement unit; a controller configured to control the power conversion circuit to generate a voltage/current waveform travelling along the first network with a power supplied by a second power source linked to the second terminal set of the power conversion circuit in response to a condition that a change rate of the measurement of the voltage/current exceeds a threshold; and locate a fault on the first network. The power conversion circuit can be re-used for different modes of operation either for power transmission under normal condition or for fault location under fault condition.

4. 发明申请

US20190293705A1 METHOD, SYSTEM AND APPARATUS FOR FAULT DETECTION 审中-公开
公开(公告)号：US20190293705A1
公开(公告)日：2019-09-26
申请号：US16440258
申请日：2019-06-13
申请人： ABB Schweiz AG
发明人： Kai Liu
IPC分类号： G01R31/08
摘要： A method, system and apparatus for fault detection in line protection for a power transmission system. The method includes: obtaining a sampled value of voltage at a measurement point, at which a protection device for the line protection is installed, on an electrical line; obtaining a sampled value of current at the measurement point; calculating an instantaneous measurement point voltage value specified by operation criterion of a protection device from the sampled value of voltage at the measurement point and the sampled value of current at the measurement point by using measurement differential equation according to a time domain lumped parameter model for the electrical line; calculating an instantaneous comparison voltage value specified by operation criterion of a protection device from the sampled value of voltage at the measurement point and the sampled value of current at the measurement point by using comparison differential equation according to a time domain lumped parameter model for the electrical line; and performing the fault detection based on the comparison result of the instantaneous measurement point voltage value and the instantaneous comparison voltage value. The method transfers the distance relay to the format of voltage comparison, calculate the voltage using differential equation instead of vector, and compare the amplitude of calculated voltages. It designs a time-domain distance protection which has strong ability to resist DC components and harmonics including high frequency harmonic and low frequency harmonic.

5. 发明申请

US20190271730A1 METHOD AND CONTROL SYSTEM FOR FAULT DIRECTION DETECTION 审中-公开
公开(公告)号：US20190271730A1
公开(公告)日：2019-09-05
申请号：US16418105
申请日：2019-05-21
申请人： ABB Schweiz AG
发明人： Kai Liu , Jianping Wang , Youyi Li
IPC分类号： G01R31/02 , H02H7/26 , H02H1/00
摘要： 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.

6. 发明申请

US20190072603A1 METHOD AND CONTROL SYSTEM FOR FAULTED PHASE DETECTION 审中-公开
公开(公告)号：US20190072603A1
公开(公告)日：2019-03-07
申请号：US16174701
申请日：2018-10-30
申请人： ABB Schweiz AG
发明人： Kai Liu , Jianping Wang , Youyi Li
IPC分类号： G01R31/02 , H02H3/16
摘要： 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.

7. 发明申请

US20180143238A1 Travelling Wave Pilot Protection Of A Transmission Line Based On Time Synchronization 审中-公开
公开(公告)号：US20180143238A1
公开(公告)日：2018-05-24
申请号：US15570493
申请日：2015-05-28
申请人： ABB Schweiz AG
发明人： YouYi Li , Jianping Wang , Kai Liu
IPC分类号： G01R31/08 , G01R31/327
CPC分类号： G01R31/085 , G01R31/088 , G01R31/3274 , G01R31/3275 , H02H7/263 , H02H7/265
摘要： 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.

8. 发明授权

US10444272B2 Method and apparatus for detection of power system disturbance within a digital substation 有权
公开(公告)号：US10444272B2
公开(公告)日：2019-10-15
申请号：US15701221
申请日：2017-09-11
申请人： ABB Schweiz AG
发明人： Kai Liu , Youyi Li , Jianping Wang
IPC分类号： G01R31/08 , H02J13/00 , H02H7/26
摘要： An objective of the application is to provide a method for detecting a disturbance in a power system within a digital substation and an apparatus using the same. The method includes: sensing electrical parameters at an end of a transmission line; sampling the sensed electrical parameters; extracting traveling-wave information from high frequency component of the samples using a signal processing method; and if the extracted traveling-wave information indicating occurrence of the disturbance, transmitting the extracted traveling-wave information to an intelligent electronic device of the digital substation from a merging unit or non-conventional instrument transformer of the digital substation. As compared with the amount of the sample data of the sensed electrical parameters, the amount of the data representing the extracted traveling-wave information is reduced. Thus the extracted traveling-wave information can be transmitted via a data link with a relatively narrow bandwidth, such as the process bus under standard IEC 61850.

9. 发明申请

US20190296543A1 METHOD FOR DETECTING FAULT IN POWER TRANSMISSION LINE AND PROTECTION SYSTEM USING THE SAME 审中-公开
公开(公告)号：US20190296543A1
公开(公告)日：2019-09-26
申请号：US16440236
申请日：2019-06-13
申请人： ABB Schweiz AG
发明人： Kai Liu , Jianping Wang , Youyi Li
IPC分类号： H02H7/26 , G01R31/02 , H02H1/00
摘要： A method for detecting fault in a power transmission line of a power transmission system and protection system using the same. The method includes: obtaining a system parameter of the power transmission system, adjusting protection reachability of a fault detecting element based on the obtained system parameter such that the adjusted protection reachability of the fault detecting element is applicable to a predetermined protection range, identifying whether there is an internal fault occurring on the transmission line using the adjusted fault detecting element, and generating a fault detection decision signal indicating the identified fault. If the predetermined protection range is desirable for the fault detecting element, its protection reachability may be adjusted in consideration of the influence imposed by the SIR such that the reach point of the adjusted fault detecting element can be extended to approach the end of the predetermined protection range. Consequently, the influence on its accuracy by various SIR values can be taken into account and accordingly the fault detecting solution can remove substantial errors as a result thereof.

10. 发明申请

US20190004103A1 METHOD, SYSTEM AND APPARATUS FOR FAULT DETECTION IN LINE PROTECTION FOR POWER TRANSMISSION SYSTEM 审中-公开
公开(公告)号：US20190004103A1
公开(公告)日：2019-01-03
申请号：US16103141
申请日：2018-08-14
申请人： ABB Schweiz AG
发明人： Kai Liu , Youi Li , Jianping Wang
IPC分类号： G01R31/02 , H02H1/00
摘要： A method, system and apparatus of fault detection in line protection for a power transmission system. A voltage (u) at a measurement point on an electrical line is obtained. The measurement point is a point at which a protection device for the line protection is installed. A current (i) at the measurement point is further obtained and a differential value of the current is determined. Then, a voltage (uq) at a setting point on the electrical line is determined from the voltage (u) at the measurement point, the current (i) at the measurement point and the differential value of the current (i) according to a time domain lumped parameter model for the electrical line. The voltage change between the determined voltage at the setting point during the fault period and a voltage at the setting point determined during a pre-fault period can be further determined. The fault detection can be performed based on the determined voltage change and a fault threshold. It can ensure voltage determination accuracy and detection reliability with a low sampling rate. Moreover, the solution can work right after the fault inception, almost no waiting time is required, and thus it may achieve a super-fast line protection.

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