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1. 发明授权

US09667131B2 Differential protection method for bridge circuit in current converter control system 有权
公开(公告)号：US09667131B2
公开(公告)日：2017-05-30
申请号：US15076662
申请日：2016-03-22
申请人： XJ GROUP CORPORATION , XUCHANG XJ SOFTWARE TECHNOLOGIES LTD , XJ ELECTRIC CO., LTD , XI'AN JIAOTONG UNIVERSITY , STATE GRID CORPORATION OF CHINA
发明人： Xing Liu , Ruizhi Jiang , Yuanhang Yang , Guobing Song , Guobin Li , Xu Zhu , Peiyao Liu
IPC分类号： H02M1/32 , H02M7/521 , H02M7/155 , H02M1/00 , H02M7/12
CPC分类号： H02M1/32 , H02H7/12 , H02M7/06 , H02M7/12 , H02M7/155 , H02M7/521 , H02M2001/0009
摘要： The present invention relates to a differential protection method for bridge circuit in current converter control system, including the steps of: 1). obtaining sample values of the three-phase current for the current converter control system at AC side thereof, and calculating the absolute value of each sampling value respectively; 2). calculating a value of current at the AC side of the current converter control system; and 3). determining whether to perform a relay protection for the current converter control system according to the value current at the AC side of the current converter control system. The method of the present invention provided, is fast, convenient, and with a small amount of calculation. The current converter control system determines whether to perform a relay protection in a short time. Also it reduces the possibility that the equipment burned because of cannot break the circuit in time.

2. 发明申请

US20170005569A1 DIFFERENTIAL PROTECTION METHOD FOR BRIDGE CIRCUIT IN CURRENT CONVERTER CONTROL SYSTEM 有权
标题翻译：电流转换器控制系统中桥接电路的差分保护方法
公开(公告)号：US20170005569A1
公开(公告)日：2017-01-05
申请号：US15076662
申请日：2016-03-22
申请人： XJ GROUP CORPORATION , XUCHANG XJ SOFTWARE TECHNOLOGIES LTD , XJ ELECTRIC CO.,LTD , XI'AN JIAOTONG UNIVERSITY , STATE GRID CORPORATION OF CHINA
发明人： Xing Liu , Ruizhi Jiang , Yuanhang Yang , Guobing Song , Guobin Li , Xu Zhu , Peiyao Liu
IPC分类号： H02M1/32 , H02M7/521
CPC分类号： H02M1/32 , H02H7/12 , H02M7/06 , H02M7/12 , H02M7/155 , H02M7/521 , H02M2001/0009
摘要： The present invention relates to a differential protection method for bridge circuit in current converter control system, including the steps of: 1). obtaining sample values of the three-phase current for the current converter control system at AC side thereof, and calculating the absolute value of each sampling value respectively; 2). calculating a value of current at the AC side of the current converter control system; and 3). determining whether to perform a relay protection for the current converter control system according to the value current at the AC side of the current converter control system. The method of the present invention provided is fast, convenient, and with a small amount of calculation. The current converter control system determines whether to perform a relay protection in a short time. Also it reduces the possibility that the equipment burned because of cannot break the circuit in time.
摘要翻译：本发明涉及电流转换器控制系统中桥式电路的差动保护方法，包括步骤：1）。获取电流转换器控制系统在其AC侧的三相电流的采样值，分别计算每个采样值的绝对值; 2）。计算当前转换器控制系统的AC侧的电流值; 和3）。根据当前变流器控制系统的AC侧的值电流，确定是否对电流变换器控制系统进行继电保护。本发明提供的方法快速，方便，且计算量少。电流转换器控制系统确定是否在短时间内执行继电保护。此外，它减少了设备因不能及时断开电路而烧毁的可能性。

3. 发明授权

US10158223B2 Method for generating current differential protection supernode based on electrical topology of regional distribution network 有权
公开(公告)号：US10158223B2
公开(公告)日：2018-12-18
申请号：US13652488
申请日：2012-10-16
申请人： XJ GROUP CORPORATION , STATE GRID CORPORATION OF CHINA
发明人： Xing Liu , Xiaohui Song , Yong Wei , Guobin Li , Dingguo Wang , Junfeng Di
IPC分类号： H02H7/28 , H02H7/26 , H02J3/00
摘要： The present invention relates to a method for generating a current differential protection supernode based on an electrical topology of a regional distribution network, which belongs to the fields of automation of electrical power systems and relay protection. The present invention generates several supernode differential protection elements, i.e., differential protection objects, and backup differential protection elements by circularly using a depth-first search method according to the inputted branch-node associative data table reflecting the electrical topology of the distribution network. the present invention can accurately located and quickly isolate the faults in the distribution network system, reduce the probability of power cut in the non-fault lines, reduce the coverage of power cut, quickly reconstruct and self-heal the distribution network, and solve the effect of the distributed access system on the distribution network protection.

4. 发明授权

US08773828B2 Busbar differential protection method 失效
标题翻译：母线差动保护方式
公开(公告)号：US08773828B2
公开(公告)日：2014-07-08
申请号：US13651482
申请日：2012-10-15
申请人： XJ Group Corporation , State Grid Corporation of China
发明人： Xiaohui Song , Xing Liu , Yong Wei , Dingguo Wang , Guobin Li
IPC分类号： H02H3/00 , H02H7/00
CPC分类号： H02H3/38 , H02H1/0069 , H02H7/226
摘要： The present invention relates to a busbar differential protection method. For each bay, firstly, zero-crossing point of voltage is determined according to sample values of voltage, then the current values are re-sampled on a current fitting curve by using zero-crossing point of voltage as a synchronous signal according to a given sampling time period to get a sample sequence. The sample sequence is comprised of current values of sampling points and sample serial numbers. The sample serial numbers of sampling points at the same time are same for the sample sequence of respective interval. Finally, computing is done to sample sequences of respective intervals, and differential protection is achieved.
摘要翻译：母线差动保护方法技术领域本发明涉及一种母线差动保护方法。对于每个隔间，首先，根据电压的采样值确定电压的过零点，然后根据给定的电压值，通过使用过零点电压作为同步信号在电流拟合曲线上重新采样电流值采样时间段以获得采样序列。采样序列由采样点和采样序列号的当前值组成。对于各个间隔的采样序列，同时采样点的采样序列号相同。最后，对各个间隔的序列进行计算，实现差分保护。

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