公开(公告)号：US06958894B2

公开(公告)日：2005-10-25

申请号：US10333390

申请日：2001-05-17

申请人： Yong Cheol Kang ,  Sang Hee Kang ,  Byung Eun Lee ,  Jae Sung Yun

发明人： Yong Cheol Kang ,  Sang Hee Kang ,  Byung Eun Lee ,  Jae Sung Yun

IPC分类号： H02H3/40 ,  H02H7/045 ,  H02H7/04

CPC分类号： H02H7/045 ,  H02H3/40

摘要： Disclosed is a relaying method for protecting a transformer by using a difference of current. A decision function, related to the rate of change of a primary current, a secondary current, or a differential current, is used for determining whether a detected abnormal current is due to the inrush or internal fault.

摘要翻译： 公开了一种通过使用电流差来保护变压器的中继方法。 使用与初级电流，次级电流或差动电流的变化率有关的决定功能来确定检测到的异常电流是否是由于涌入或内部故障。

公开(公告)号：US07127364B2

公开(公告)日：2006-10-24

申请号：US11010747

申请日：2004-12-13

申请人： Sang Hee Kang ,  Dong Gyu Lee ,  Seung Ho Hyun ,  Yong Cheol Kang

发明人： Sang Hee Kang ,  Dong Gyu Lee ,  Seung Ho Hyun ,  Yong Cheol Kang

IPC分类号： G01R19/00 ,  G06F19/00

CPC分类号： H02H1/046 ,  G01R15/183 ,  H02M2001/0009

摘要： Disclosed herein is a method of compensating for the distorted secondary/ current of a current transformer. The method includes steps (a), (b) and (c). At step (a), the saturated section of the current transformer is detected. At step (b), fault current generated during a fault in a power system is represented using an AutoRegressive (AR) model, with the fault current being assumed to be a combination of a Direct Current (DC) offset component, a fundamental wave component and harmonic components. At step (c), coefficients of the AR model are estimated and the secondary current during saturation of the current transformer is compensated, based on the secondary current data sampled in the unsaturated section.

摘要翻译： 这里公开了一种补偿电流互感器的失真次级/电流的方法。 该方法包括步骤（a），（b）和（c）。 在步骤（a）中，检测电流互感器的饱和部分。 在步骤（b）中，使用自动反馈（AR）模型来表示电力系统故障期间产生的故障电流，故障电流假定为直流（DC）偏移分量，基波分量 和谐波分量。 在步骤（c）中，基于在不饱和部分中采样的二次电流数据，估计AR模型的系数并且补偿电流互感器饱和期间的次级电流。

公开(公告)号：US06617839B2

公开(公告)日：2003-09-09

申请号：US10204769

申请日：2002-08-23

申请人： Yong-Cheol Kang ,  Sang-Hee Kang ,  Seung-Hun Ok

发明人： Yong-Cheol Kang ,  Sang-Hee Kang ,  Seung-Hun Ok

IPC分类号： G01R3300

CPC分类号： H02H1/046

摘要： Disclosed is a method for detecting saturation of a current transformer. The method determines whether or not a change of a secondary current generated in a current transformer is due to the saturation of the current transformer.

公开(公告)号：US07340355B2

公开(公告)日：2008-03-04

申请号：US11476891

申请日：2005-05-09

申请人： Yong-Cheol Kang ,  Sang-Hee Kang

发明人： Yong-Cheol Kang ,  Sang-Hee Kang

IPC分类号： G01R31/00

CPC分类号： H02H7/045

摘要： Disclosed is a compensated current differential relaying method and system for protecting a transformer more correctly by calculating and estimating an exciting current including a core-loss current and a magnetizing current, and, in particular, to a compensated current differential relaying method and system which can protect the transformer correctly irrespective of the level of remanent flux.

摘要翻译： 公开了一种补偿电流差动继电方法和系统，用于通过计算和估计包括铁心损耗电流和励磁电流的励磁电流来更正确地保护变压器，特别涉及一种补偿电流差动继电方法和系统， 正确地保护变压器，而不考虑剩余通量的水平。

公开(公告)号：US07103485B2

公开(公告)日：2006-09-05

申请号：US10494870

申请日：2003-04-17

申请人： Yong-Cheol Kang ,  Sang-Hee Kang ,  Yi-Jae Lim

发明人： Yong-Cheol Kang ,  Sang-Hee Kang ,  Yi-Jae Lim

IPC分类号： G06F17/13

CPC分类号： H02H1/046 ,  H02H1/0092

摘要： A method for preventing the unwanted maloperation of a protective relay system that is caused by the imprecise detection of an actual secondary current value resulting from a measured secondary current being distorted comprises the steps of calculating difference values for sampled secondary currents; comparing absolute values of the difference values with a predetermined critical value, and determining a saturation starting moment of a current transformer when one of the absolute values exceeds the predetermined critical value; obtaining a magnetizing current at the saturation starting moment using the difference values if the saturation starting moment is determined, and obtaining a magnetic flux value in a steel core of the current transformer from a magnetization curve using the magnetizing current; calculating a magnetic flux value at a time after the saturation starting moment using a secondary current value measured at that time and the magnetic flux value obtained at the saturation starting moment so as to obtain a secondary current value consistent with a current transformation ratio at that time; obtaining a magnetizing current at that time from the magnetization curve using the magnetic flux value calculated at that time; and obtaining the secondary current value consistent with the current transformation ratio by adding the obtained magnetizing current and the measured secondary current value.

摘要翻译： 一种用于防止由测量的二次电流失真导致的实际二次电流值的不精确检测引起的保护继电器系统的不期望的误操作的方法包括以下步骤：计算采样次级电流的差值; 将所述差值的绝对值与预定临界值进行比较，以及当绝对值之一超过预定临界值时确定电流互感器的饱和开始时刻; 如果确定饱和起动矩，则使用差值获得在饱和起动时刻的磁化电流，并且使用磁化电流从磁化曲线获得电流互感器的钢芯中的磁通量值; 使用该时刻测定的二次电流值和饱和开始时刻得到的磁通值计算饱和开始时刻之后的时间的磁通值，以获得与当时的当前变换比一致的二次电流值 ; 使用当时计算出的磁通值，从磁化曲线获得此时的磁化电流; 并且通过将获得的磁化电流和所测量的二次电流值相加来获得与电流变换比一致的二次电流值。

公开(公告)号：US06731481B2

公开(公告)日：2004-05-04

申请号：US10001599

申请日：2001-10-23

申请人： Yong Cheol Kang ,  Sang Hee Kang ,  Byung Eun Lee ,  Jae Sung Yun ,  Seung Hun Ok

发明人： Yong Cheol Kang ,  Sang Hee Kang ,  Byung Eun Lee ,  Jae Sung Yun ,  Seung Hun Ok

IPC分类号： H02H704

CPC分类号： H02H7/0455 ,  H02H6/005

摘要： The present invention relates to a relaying method using the ratio of induced voltages or the ratio of flux linkage increments. The protective relaying method for power transformers with one or more phases includes the first step of obtaining primary and secondary voltages and currents of the transformer; the second step of calculating induced voltages, induced voltage differences, ratio of primary and secondary induced voltages, or ratio of primary and secondary induced voltage differences from the currents and the voltages; the third step of calculating at least one predetermined decision parameter derived from at least one predetermined equation; the fourth step of deciding whether an internal winding fault occurs by comparing the decision parameter to the induced voltages, the induced voltage differences, the ratio of primary and secondary induced voltages, or the ratio of primary and secondary induced voltage differences.

摘要翻译： 本发明涉及使用感应电压比或磁链增量比的中继方法。 具有一个或多个相的电力变压器的保护继电方法包括获得变压器的初级和次级电压和电流的第一步骤; 计算感应电压，感应电压差，初级和次级感应电压的比率或初级和次级感应电压差与电流和电压的比率的第二步; 计算从至少一个预定方程导出的至少一个预定决定参数的第三步骤; 通过将判定参数与感应电压，感应电压差，初级和次级感应电压的比率或初级和次级感应电压差的比值进行比较来决定是否发生内部绕组故障。

公开(公告)号：US08587142B2

公开(公告)日：2013-11-19

申请号：US13225422

申请日：2011-09-03

申请人： Yong Cheol Kang ,  Yeon Hee Kim ,  Tai Ying Zheng

发明人： Yong Cheol Kang ,  Yeon Hee Kim ,  Tai Ying Zheng

IPC分类号： H02P9/04

CPC分类号： F03D7/048 ,  F03D9/257 ,  Y02E10/723

摘要： The present invention relates to a method and system for controlling a wind farm when a ramp up or ramp down rate of the wind farm does not satisfy a grid-code or corresponding criteria due to an abrupt change in wind speed. The method and system for controlling a wind farm includes the steps of measuring speed and direction of wind performed outside the wind farm, sequentially controlling wind turbines if the wind speed abruptly changes considering a time for the wind to arrive at the wind turbines, determining the number of wind turbines to be controlled simultaneously so that the wind farm may satisfy the grid-code at this point, grouping the wind turbines, determining a control sequence and a control time of each group, and adjusting a control end time if stopping times of adjacent groups are overlapped when the wind turbines are stopped.

摘要翻译： 本发明涉及一种风电场的斜坡上升或下降速率由于风速突然变化而不满足电网码或相应准则的情况下，用于控制风电场的方法和系统。 用于控制风力发电场的方法和系统包括以下步骤：测量在风力发电场外进行的风的速度和方向，如果考虑到风到达风力涡轮机的时间风速突然改变，则依次控制风力涡轮机，确定 要同时控制的风力涡轮机的数量，使得风力发电场在这一点上可以满足电网码，分组风力涡轮机，确定每个组的控制序列和控制时间，以及如果停止时间 当风力涡轮机停止时，相邻的组重叠。

公开(公告)号：US20120200086A1

公开(公告)日：2012-08-09

申请号：US13225422

申请日：2011-09-03

申请人： Yong Cheol KANG ,  Yeon Hee KIM ,  Tai Ying ZHENG

发明人： Yong Cheol KANG ,  Yeon Hee KIM ,  Tai Ying ZHENG

IPC分类号： H02P9/04

CPC分类号： F03D7/048 ,  F03D9/257 ,  Y02E10/723

摘要： The present invention relates to a method and system for controlling a wind farm when a ramp up or ramp down rate of the wind farm does not satisfy a grid-code or corresponding criteria due to an abrupt change in wind speed. The method and system for controlling a wind farm includes the steps of measuring speed and direction of wind performed outside the wind farm, sequentially controlling wind turbines if the wind speed abruptly changes considering a time for the wind to arrive at the wind turbines, determining the number of wind turbines to be controlled simultaneously so that the wind farm may satisfy the grid-code at this point, grouping the wind turbines, determining a control sequence and a control time of each group, and adjusting a control end time if stopping times of adjacent groups are overlapped when the wind turbines are stopped.

摘要翻译： 本发明涉及一种风电场的斜坡上升或下降速率由于风速突然变化而不满足电网码或相应准则的情况下，用于控制风电场的方法和系统。 用于控制风力发电场的方法和系统包括以下步骤：测量在风力发电场外进行的风的速度和方向，如果考虑到风到达风力涡轮机的时间风速突然改变，则依次控制风力涡轮机，确定 要同时控制的风力涡轮机的数量，使得风力发电场在这一点上可以满足电网码，分组风力涡轮机，确定每个组的控制序列和控制时间，以及如果停止时间 当风力涡轮机停止时，相邻的组重叠。

公开(公告)号：US20110210715A1

公开(公告)日：2011-09-01

申请号：US11991607

申请日：2006-07-27

申请人： Yong Kyun Kim ,  Yong Cheol Kang ,  Sung Il Jang

发明人： Yong Kyun Kim ,  Yong Cheol Kang ,  Sung Il Jang

IPC分类号： H01F38/28

CPC分类号： H01F27/422 ,  G01R35/02

摘要： Provided an error compensating method for an instrument transformer, in which an error of an instrument transformer is compensated by reflecting hysteresis characteristics of iron core. When such error compensation is performed, a hysteresis loop indicating the relationship between magnetic flux and excitation current is not used as it is, but core-loss resistances and magnetic flux-excitation current curves are used, thereby achieving more precise compensation. According to the present invention, an error of an instrument transformer can be significantly reduced. Therefore, it is possible to manufacture an instrument transformer with high accuracy and to significantly reduce the size of the instrument transformer. Further, a material with high permeability does not need to be used in order to increase the accuracy.

摘要翻译： 提供了一种仪表变压器的误差补偿方法，其中通过反映铁芯的磁滞特性来补偿仪表变压器的误差。 当进行这种误差补偿时，不直接使用指示磁通与励磁电流的关系的磁滞回线，而是使用铁心损耗电阻和磁通励磁电流曲线，从而实现更精确的补偿。 根据本发明，可以显着地减少仪表变压器的误差。 因此，可以以高精度制造仪表变压器，并显着减小仪表变压器的尺寸。 此外，为了提高精度，不需要使用具有高磁导率的材料。

公开(公告)号：US20050035751A1

公开(公告)日：2005-02-17

申请号：US10494870

申请日：2003-04-17

申请人： Yong-Cheol Kang ,  Sang-Hee Kang ,  Yi-Jae Lim

发明人： Yong-Cheol Kang ,  Sang-Hee Kang ,  Yi-Jae Lim

IPC分类号： H02H1/00 ,  H02H1/04 ,  G01R33/00

CPC分类号： H02H1/046 ,  H02H1/0092

摘要： The present invention relates to a method for preventing the unwanted maloperation of a protective relay system that is caused by the imprecise detection of an actual secondary current value resulting from a measured secondary current being distorted. The method comprises the steps of calculating difference values having at least second order for sampled secondary currents; comparing absolute values of the difference values with a predetermined critical value, and determining a saturation starting moment of a current transformer when one of the absolute values exceeds the predetermined critical value; obtaining a magnetizing current at the saturation starting moment using the difference values if the saturation starting moment is determined, and obtaining a magnetic flux value in a steel core of the current transformer from a magnetization curve using the magnetizing current; calculating a magnetic flux value at a time after the saturation starting moment using a secondary current value measured at that time and the magnetic flux value obtained at the saturation starting moment so as to obtain a secondary current value consistent with a current transformation ratio at that time; obtaining a magnetizing current at that time from the magnetization curve using the magnetic flux value calculated at that time; and obtaining the secondary current value consistent with the current transformation ratio by adding the obtained magnetizing current and the measured secondary current value.

摘要翻译： 本发明涉及一种用于防止由于测量的二次电流失真导致的实际二次电流值的不精确检测而导致的保护继电器系统的不期望的误动作的方法。 该方法包括以下步骤：计算具有至少二次采样二次电流的差值; 将所述差值的绝对值与预定临界值进行比较，以及当绝对值之一超过预定临界值时确定电流互感器的饱和开始时刻; 如果确定饱和起动矩，则使用差值获得在饱和起动时刻的磁化电流，并且使用磁化电流从磁化曲线获得电流互感器的钢芯中的磁通量值; 使用该时刻测定的二次电流值和饱和开始时刻得到的磁通值计算饱和开始时刻之后的时间的磁通值，以获得与当时的当前变换比一致的二次电流值 ; 使用当时计算出的磁通值，从磁化曲线获得此时的磁化电流; 并且通过将获得的磁化电流和所测量的二次电流值相加来获得与电流变换比一致的二次电流值。