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1. 发明申请

WO2017177424A1 METHOD, SYSTEM AND APPARATUS FOR FAULT DETECTION IN LINE PROTECTION FOR POWER TRANSMISSION SYSTEM 审中-公开
标题翻译：输电线路保护故障检测方法，系统和装置
公开(公告)号：WO2017177424A1
公开(公告)日：2017-10-19
申请号：PCT/CN2016/079323
申请日：2016-04-14
申请人： ABB SCHWEIZ AG , LIU, Kai , LI, Youyi , WANG, Jianping
发明人： LIU, Kai , LI, Youyi , WANG, Jianping
IPC分类号： G01R31/08
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 (u q ) 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.
摘要翻译：一种用于电力传输系统的线路保护中的故障检测方法，系统和设备。获得电线上测量点处的电压（u）。测量点是安装线路保护装置的点。进一步获得测量点处的电流（i）并确定电流的微分值。然后，根据测量点处的电压（u），测量点处的电流（i）以及测量点处的电流（i）的微分值来确定电线上的设定点处的电压（u 电流（i）根据电线的时域集总参数模型。可以进一步确定故障期间设定点处的确定电压与故障前期间确定的设定点处的电压之间的电压变化。故障检测可以基于所确定的电压变化和故障阈值来执行。它能以较低的采样率确保电压测定精度和检测可靠性。而且，解决方案在故障发生后可以正常工作，几乎不需要等待时间，因此可以实现超高速线路保护。

2. 发明申请

WO2018133061A1 METHOD AND CONTROL SYSTEM FOR FAULT DIRECTION DETECTION 审中-公开
公开(公告)号：WO2018133061A1
公开(公告)日：2018-07-26
申请号：PCT/CN2017/072045
申请日：2017-01-22
申请人： ABB SCHWEIZ AG , LIU, Kai , WANG, Jianping , LI, Youyi
发明人： LIU, Kai , WANG, Jianping , LI, Youyi
IPC分类号： G01R31/08
摘要： It provides a method for detecting fault direction of transmission line (10) of an AC power system (1) and a control system using the same. The method includes sampling current values and voltage values at one end of the transmission line (10) for a series of time points； computing instantaneous voltage values at compensated point on the transmission line (10) from the current value samples and the voltage value samples based on a time domain lumped parameter differential equation for the transmission line (10) 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 two of the series of time points； computing at least one current fault component each using the recorded current value samples for 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 (1) with strong power source.

3. 发明申请

WO2018120054A1 METHOD AND CONTROL SYSTEM FOR FAULTED PHASE DETECTION 审中-公开
公开(公告)号：WO2018120054A1
公开(公告)日：2018-07-05
申请号：PCT/CN2016/113584
申请日：2016-12-30
申请人： ABB SCHWEIZ AG , LIU, Kai , WANG, Jianping , LI, Youyi
发明人： LIU, Kai , WANG, Jianping , LI, Youyi
IPC分类号： G01R31/08 , H02H7/26
CPC分类号： G01R31/025 , G01R19/2513 , G01R31/085 , H02H3/165 , H02H3/385 , H02H7/26
摘要： Provided are a method and a control system for detecting faulted phases of transmission lines in an AC power system and a protective relay using the same. 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 or fault types.

4. 发明申请

WO2018227466A1 METHOD FOR DETECTING FAULT IN POWER TRANSMISSION LINE AND PROTECTION SYSTEM USING THE SAME 审中-公开
公开(公告)号：WO2018227466A1
公开(公告)日：2018-12-20
申请号：PCT/CN2017/088416
申请日：2017-06-15
申请人： ABB SCHWEIZ AG , LIU, Kai , WANG, Jianping , LI, Youyi
发明人： LIU, Kai , WANG, Jianping , LI, Youyi
IPC分类号： H02H7/26
摘要： It provides a method for detecting fault in a power transmission line of a power transmission system and protection system using the same. The method includes steps of: 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.

5. 发明申请

WO2016074198A1 DC GRID CURRENT DIFFERENTIAL PROTECTION METHOD AND SYSTEM THEREOF 审中-公开
标题翻译：直流电流差分保护方法及其系统
公开(公告)号：WO2016074198A1
公开(公告)日：2016-05-19
申请号：PCT/CN2014/091024
申请日：2014-11-13
申请人： ABB TECHNOLOGY LTD , LIU, Kai , LI, Youyi , WANG, Jianping
发明人： LIU, Kai , LI, Youyi , WANG, Jianping
IPC分类号： H02H7/26
CPC分类号： H02H7/268 , G01R31/08 , H02H7/261 , H02H7/263 , H02H7/265
摘要： A DC grid current differential protection method and system are provided. The method includes: sampling value acquiring step (S301): acquiring pole voltage and current sampling values in local and remote terminal of a DC line; fault component extracting step (S302): calculating fault component pole voltage and current values according to the pole voltage and current sampling values of local and remote terminal respectively; Bergeron model calculating step (S303): acquiring fault component pole current values at selected point on the DC line between the local and the remote terminal, by the calculation of the fault component pole voltage and current values of local and remote terminal calculated in the fault component extracting step, based on Bergeron model; current differential protection judging step (S304): judging internal fault if the fault component pole current values at selected point meet preset current differential protection criterion. Because of adopting Bergeron model, it improves the calculating speed.
摘要翻译：提供直流电网电流差动保护方法和系统。该方法包括：采样值获取步骤（S301）：获取DC线路本地和远端终端的极电压和电流采样值; 故障分量提取步骤（S302）：分别根据本地和远端的极点电压和电流采样值计算故障分量极点电压和电流值; 贝格龙模型计算步骤（S303）：通过计算故障分量极点电压和在故障中计算的本地和远程终端的当前值，获取本地和远程终端之间直流线上选定点的故障分量极点电流值基于贝格伦模型的分量提取步骤; 电流差动保护判断步骤（S304）：如果选定点的故障分量极点电流值满足预设电流差动保护标准，则判断内部故障。采用Bergeron模型，提高了计算速度。

6. 发明申请

WO2016074199A1 DC GRID PROTECTION METHOD AND SYSTEM THEREOF 审中-公开
标题翻译：直流防雷方法及其系统
公开(公告)号：WO2016074199A1
公开(公告)日：2016-05-19
申请号：PCT/CN2014/091027
申请日：2014-11-13
申请人： ABB TECHNOLOGY LTD , LIU, Kai , LI, Youyi , WANG, Jianping
发明人： LIU, Kai , LI, Youyi , WANG, Jianping
IPC分类号： H02H7/26 , G01R31/08
CPC分类号： H02H7/268 , G01R31/08 , H02H3/42 , H02H7/263 , H02H7/265
摘要： A DC grid protection method and system are provided. The method comprises the following steps: fault detecting step (501): acquiring fault component travelling wave current value △i and fault component travelling wave voltage value △u of a DC line, wherein forward direction is defined extending from the protection to the DC line; fault determining step (502): if △i and △u at fault occurring time meet following criterions, performing fault detection determination step, the criterions include: product of △i and △u being less than a forward value which is bigger than zero and is associated with a predetermined threshold; and absolute value of △i or △u meeting a sensitivity requirement which is determined by the predetermined threshold; fault direction determination step (503): determining the fault as forward fault. Said scheme can overcome the problem in the prior art and implement the pilot protection in the DC system, especially in the HVDC system.
摘要翻译：提供了直流电网保护方法和系统。该方法包括以下步骤：故障检测步骤（501）：获取直流线路的故障分量行波电流值△i和故障分量行波电压值△u，其中正向定义为从保护延伸到直流线路 ; 故障判定步骤（502）：如果故障发生时间的△i和△u符合以下标准，则执行故障检测确定步骤，其标准包括：△i和△u的乘积小于大于零的正向值，与预定阈值相关联; 并且满足由预定阈值确定的灵敏度要求的△i或△u的绝对值; 故障方向确定步骤（503）：将故障确定为前向故障。所述方案可以克服现有技术中的问题，并实现直流系统中的先导保护，特别是在直流系统中。

7. 发明申请

WO2016141568A1 METHOD AND APPARATUS FOR DETECTION OF POWER SYSTEM DISTURBANCE WITHIN DIGITAL SUBSTATION 审中-公开
标题翻译：用于检测数字基站中电力系统干扰的方法和装置
公开(公告)号：WO2016141568A1
公开(公告)日：2016-09-15
申请号：PCT/CN2015/074001
申请日：2015-03-11
申请人： ABB TECHNOLOGY LTD , LIU, Kai , LI, Youyi , WANG, Jianping
发明人： LIU, Kai , LI, Youyi , WANG, Jianping
IPC分类号： H02J13/00 , G01R31/08
CPC分类号： G01R31/085 , H02H7/265 , H02J13/00
摘要： A method for detecting a disturbance in a power system (1) within a digital substation and an apparatus using the same. The method includes: sensing electrical parameters at an end of a transmission line (10); 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 (11) from a merging unit (112) or non-conventional instrument transformer of the digital substation (11). 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.
摘要翻译：一种用于检测数字变电站内的电力系统（1）中的干扰的方法和使用该干扰的装置。该方法包括：感测传输线（10）的末端的电参数; 对感测到的电参数进行采样; 使用信号处理方法从样本的高频分量提取行波信息; 如果所提取的指示出现干扰的旅行波信息从数字变电站的合并单元（112）或非常规仪表变压器传送到数字变电站（11）的智能电子设备，则提取的行波信息（11）。与感测到的电参数的采样数据的量相比，表示所提取的行波信息的数据量减少。因此，提取的行波信息可以经由具有相对较窄带宽的数据链路传输，例如在标准IEC 61850下的过程总线。

8. 发明申请

WO2014166027A1 A METHOD FOR DETECTING FAULT AND CURRENT DIFFERENTIAL PROTECTION SYSTEM THEREOF 审中-公开
标题翻译：一种用于检测故障和电流差动保护系统的方法
公开(公告)号：WO2014166027A1
公开(公告)日：2014-10-16
申请号：PCT/CN2013/073797
申请日：2013-04-07
申请人： ABB TECHNOLOGY LTD. , LI, Youyi , LIU, Kai , BRNCIC, Ivo , SHI, Zhanpeng
发明人： LI, Youyi , LIU, Kai , BRNCIC, Ivo , SHI, Zhanpeng
IPC分类号： H02H3/28
CPC分类号： H02H9/02 , H02H3/006 , H02H3/28 , H02H3/283 , H02H7/045
摘要： The present invention discloses a method for detecting fault and current differential protection system thereof. The method for detecting fault comprises: calculating fault component currents; calculating the operate current and restraint current of all terminals; and adjusting the operate level by adapting an operate-restraint characteristic according to the fault component, it has very small operate area for external fault, which makes it very reliable even for the case with serious CT saturation. While a very big operate area for internal fault makes it very sensitive for internal fault even for heavy load and high resistance fault.
摘要翻译：本发明公开了一种用于检测故障和电流差动保护系统的方法。检测故障的方法包括：计算故障分量电流; 计算所有端子的工作电流和约束电流; 通过根据故障分量调整运行限制特性来调整运行电平，对于外部故障具有非常小的操作区域，即使对于严重的CT饱和情况也是如此。虽然内部故障的非常大的操作区域对于内部故障甚至对于重负载和高电阻故障也非常敏感。

9. 发明申请

WO2018227485A1 METHOD, SYSTEM AND APPARATUS FOR FAULT DETECTION 审中-公开
公开(公告)号：WO2018227485A1
公开(公告)日：2018-12-20
申请号：PCT/CN2017/088474
申请日：2017-06-15
申请人： ABB SCHWEIZ AG , LIU, Kai
发明人： LIU, Kai
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 comprises the following steps: 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 (110); obtaining a sampled value of current at the measurement point (120); 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 (130); 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 (140); and performing the fault detection based on the comparison result of the instantaneous measurement point voltage value and the instantaneous comparison voltage value (150). 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.

10. 发明申请

WO2020146999A1 PV POWER CONVERTER AND CONTROL METHOD AND PV POWER PLANT USING THE SAME 审中-公开
公开(公告)号：WO2020146999A1
公开(公告)日：2020-07-23
申请号：PCT/CN2019/071743
申请日：2019-01-15
申请人： ABB SCHWEIZ AG , HUANG, Xing , YANG, Xiaobo , LIU, Kai , XIE, Hailian
发明人： HUANG, Xing , YANG, Xiaobo , LIU, Kai , XIE, Hailian
IPC分类号： H02J3/38 , H02J50/10
摘要： A PV power converter (4a, 4b, 4c, 4d), its control method and a PV power plant, the PV power converter includes: output terminals, input terminals being configured to be electrically coupled to output ends of PV array (2a, 2b, 2c, 2d), a power conversion circuit being configured to convert power supplied from the PV array (2a, 2b, 2c, 2d), and output the converted power at the output terminals, having at least one power switch being electrically inserted between the input terminals for bypassing a flow of the converted power around the output terminals, and a local controller (9a, 9b, 9c, 9d) being configured to close the power switch in response to an occurrence of a fault external to the PV power converter (4a, 4b, 4c, 4d) and keep the power switch closed for a predetermined time interval longer than a switching period of the power conversion circuit. This is helpful for decreasing the DC short circuit value while not relying on the conventional fault clear devices, such like fuses and circuit breaker. Consequently, this makes the system cheaper by not using the sorts of fault protection devices.

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