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1.发明授权公开(公告)号：US08095326B2
公开(公告)日：2012-01-10
申请号：US12633444
申请日：2009-12-08
CPC分类号： G01R31/088 , G01R19/2513 , H02J13/0006
摘要： A method to predict a state of a power system and a device to perform the method are presented, where the method includes the step of performing a Fast Fourier Transform on samples of a periodic waveform signal in order to determine a frequency spectrum of the signal, where the signal was derived from at least one measurable electric quantity of the power system and is representative for the state of the power system. Frequencies and related complex amplitudes at selected peaks in the frequency spectrum are determined and stored together with a time stamp. Afterwards, a predicted value of the periodic waveform signal in the time domain is determined at a prediction time by calculating a sum of sinusoidal signals at the prediction time, where each of the sinusoidal signals is characterized by one of the determined frequencies and its related complex amplitude as well as the time stamp.
摘要翻译： 提出了一种预测电力系统的状态和执行该方法的装置的方法，其中该方法包括对周期性波形信号的采样执行快速傅立叶变换以确定该信号的频谱的步骤， 其中信号是从电力系统的至少一个可测量电量导出的，并且代表电力系统的状态。 在频谱中的选定峰处的频率和相关复振幅被确定并与时间戳一起存储。 之后，通过在预测时间计算正弦信号之和，在预测时间确定时域中周期性波形信号的预测值，其中每个正弦信号由所确定的频率之一及其相关复合物 幅度以及时间戳。
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2.发明申请公开(公告)号：US20100088048A1
公开(公告)日：2010-04-08
申请号：US12633444
申请日：2009-12-08
CPC分类号： G01R31/088 , G01R19/2513 , H02J13/0006
摘要： A method to predict a state of a power system and a device to perform the method are presented, where the method includes the step of performing a Fast Fourier Transform on samples of a periodic waveform signal in order to determine a frequency spectrum of the signal, where the signal was derived from at least one measurable electric quantity of the power system and is representative for the state of the power system. Frequencies and related complex amplitudes at selected peaks in the frequency spectrum are determined and stored together with a time stamp. Afterwards, a predicted value of the periodic waveform signal in the time domain is determined at a prediction time by calculating a sum of sinusoidal signals at the prediction time, where each of the sinusoidal signals is characterized by one of the determined frequencies and its related complex amplitude as well as the time stamp.
摘要翻译： 提出了一种预测电力系统的状态和执行该方法的装置的方法，其中该方法包括对周期性波形信号的采样执行快速傅立叶变换以确定该信号的频谱的步骤， 其中信号是从电力系统的至少一个可测量电量导出的，并且代表电力系统的状态。 在频谱中的选定峰处的频率和相关复振幅被确定并与时间戳一起存储。 之后，通过在预测时间计算正弦信号之和，在预测时间确定时域中周期性波形信号的预测值，其中每个正弦信号由所确定的频率之一及其相关复合物 幅度以及时间戳。
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公开(公告)号：US09041383B2
公开(公告)日：2015-05-26
申请号：US14030456
申请日：2013-09-18
申请人： Tord Bengtsson , Henrik Johansson , Stefan Roxenborg , Joseph Menezes , Zoltan Nagy , Mikael Sehlstedt
发明人： Tord Bengtsson , Henrik Johansson , Stefan Roxenborg , Joseph Menezes , Zoltan Nagy , Mikael Sehlstedt
CPC分类号： H01F27/42
摘要： A method for linearizing voltage transmission through a transformer including a magnetic core and, input and output windings. A measurement signal is supplied to the input winding at a first frequency and an output signal is measured at the output winding of the transformer, wherein the voltage of the measurement signal may be so low that the transformer operates in a non-linear region. The method includes, for a conditioning signal, selecting a second frequency different from the first frequency, defining an amplitude value of the conditioning signal and supplying the conditioning signal to the input winding at the second frequency with the defined amplitude value so that the transformer operates in its linear region.
摘要翻译： 通过包括磁芯和输入和输出绕组的变压器线性化电压传输的方法。 测量信号以第一频率提供给输入绕组，并且在变压器的输出绕组处测量输出信号，其中测量信号的电压可能非常低以致变压器在非线性区域中工作。 该方法包括：对于调节信号，选择不同于第一频率的第二频率，定义调节信号的振幅值，并以定义的振幅值将调理信号以第二频率提供给输入绕组，使变压器工作 在其线性区域。
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4.发明申请Method And Device For Enhancing The Reliability Of Generator Ground Fault Detection On A Rotating Electrical Machine 有权用于提高发电机接地故障检测在旋转电机上的可靠性的方法和装置公开(公告)号：US20130335097A1
公开(公告)日：2013-12-19
申请号：US13972305
申请日：2013-08-21
IPC分类号： G01R31/02
CPC分类号： G01R31/025 , G01R27/18 , G01R31/343 , H02H1/003
摘要： A method for enhancing the reliability of generator ground fault detection based on a signal injection scheme, wherein the generator includes a winding. The method includes injecting a test signal at a predefined frequency to the winding, measuring an electrical quantity of a response signal in the winding resulted from the injected test signal, and detecting a ground fault based on the measured value of the electrical quantity. The method further includes continuously determining the frequency of the response signal, and discarding the present measured value corresponding to the determined frequency when the determined frequency deviates from the predefined frequency with a first threshold value.
摘要翻译： 一种用于增强基于信号注入方案的发电机接地故障检测的可靠性的方法，其中所述发电机包括绕组。 该方法包括将预定频率的测试信号注入到绕组，测量由注入的测试信号产生的绕组中的响应信号的电量，并且基于电量的测量值检测接地故障。 该方法还包括连续地确定响应信号的频率，以及当所确定的频率偏离具有第一阈值的预定频率时，丢弃对应于所确定的频率的当前测量值。
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5.发明申请公开(公告)号：US20120099233A1
公开(公告)日：2012-04-26
申请号：US13280128
申请日：2011-10-24
摘要： A method and a device for supervising the sensitivity of a protection function in an electrical power system including a metering device for measuring values of a feature, said protection function being configured to initialize an action based on a test value and a threshold value for the feature, wherein said test value is either a measured value or derived from the said measured values, the device includes a computing unit configured to receive the test values and, repeatedly during the operation of the protection function, to calculate a mean value and a deviation of the test values, to determine the probability of a false action based on the calculated mean value, the threshold value and the calculated deviation, and to indicate that the sensitivity is too high when the probability of a false action exceeds a first limit value for the probability of a false action.
摘要翻译： 一种用于监视包括用于测量特征值的计量装置的电力系统中的保护功能的灵敏度的方法和装置，所述保护功能被配置为基于所述特征的测试值和阈值初始化动作 ，其中所述测试值是测量值或从所述测量值导出，所述设备包括被配置为接收所述测试值并且在所述保护功能的操作期间重复地计算平均值和偏差的计算单元 测试值，以基于计算的平均值，阈值和计算的偏差来确定错误动作的概率，并且当虚假动作的概率超过第一限制值时，表示灵敏度太高 误报的概率。
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公开(公告)号：US09075099B2
公开(公告)日：2015-07-07
申请号：US14002929
申请日：2011-03-03
IPC分类号： G01R31/14 , G01R31/06 , G01R31/34 , H02H3/00 , G01R31/02 , H02H1/00 , H02H3/08 , H02H7/00 , H02H7/08
CPC分类号： G01R31/025 , G01R31/343 , H02H1/003 , H02H3/08 , H02H7/00 , H02H7/0822
摘要： A method for adapting a ground fault detection to a change of an electrical machine condition, wherein the machine includes a winding. The electrical machine is in a first machine condition, a first reference value being defined for measured values of an electrical quantity. The ground fault detection includes continuously measuring the electrical quantity in the winding and detecting a ground fault based on the measured values of the electrical quantity and the first reference value. The method includes receiving a signal, detecting a change of machine condition based on the received signal, and changing to a second reference value for the measured values of the electrical quantity, the second reference value being different from the first reference value when the change of machine condition is detected.
摘要翻译： 一种用于使接地故障检测适应于电机状态变化的方法，其中所述机器包括绕组。 电机处于第一机器状态，为电量的测量值定义第一参考值。 接地故障检测包括连续测量绕组中的电量，并根据电量和第一参考值的测量值检测接地故障。 该方法包括接收信号，基于接收到的信号检测机器状态的变化，并且改变为电量的测量值的第二参考值，当第二参考值与第一参考值不同时，第二参考值不同于第一参考值 检测到机器状况。
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公开(公告)号：US20140015510A1
公开(公告)日：2014-01-16
申请号：US14030456
申请日：2013-09-18
申请人： Tord Bengtsson , Henrik Johansson , Stefan Roxenborg , Joseph Menezes , Zoltan Nagy , Mikael Sehlstedt
发明人： Tord Bengtsson , Henrik Johansson , Stefan Roxenborg , Joseph Menezes , Zoltan Nagy , Mikael Sehlstedt
IPC分类号： H01F27/42
CPC分类号： H01F27/42
摘要： A method for linearizing voltage transmission through a transformer including a magnetic core and, input and output windings. A measurement signal is supplied to the input winding at a first frequency and an output signal is measured at the output winding of the transformer, wherein the voltage of the measurement signal may be so low that the transformer operates in a non-linear region. The method includes, for a conditioning signal, selecting a second frequency different from the first frequency, defining an amplitude value of the conditioning signal and supplying the conditioning signal to the input winding at the second frequency with the defined amplitude value so that the transformer operates in its linear region.
摘要翻译： 通过包括磁芯和输入和输出绕组的变压器线性化电压传输的方法。 测量信号以第一频率提供给输入绕组，并且在变压器的输出绕组处测量输出信号，其中测量信号的电压可能非常低以致变压器在非线性区域中工作。 该方法包括：对于调节信号，选择不同于第一频率的第二频率，定义调节信号的振幅值，并以定义的振幅值将调理信号以第二频率提供给输入绕组，使变压器工作 在其线性区域。
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公开(公告)号：US20130335098A1
公开(公告)日：2013-12-19
申请号：US14002929
申请日：2011-03-03
IPC分类号： G01R31/02
CPC分类号： G01R31/025 , G01R31/343 , H02H1/003 , H02H3/08 , H02H7/00 , H02H7/0822
摘要： A method for adapting a ground fault detection to a change of an electrical machine condition, wherein the machine includes a winding. The electrical machine is in a first machine condition, a first reference value being defined for measured values of an electrical quantity. The ground fault detection includes continuously measuring the electrical quantity in the winding and detecting a ground fault based on the measured values of the electrical quantity and the first reference value. The method includes receiving a signal, detecting a change of machine condition based on the received signal, and changing to a second reference value for the measured values of the electrical quantity, the second reference value being different from the first reference value when the change of machine condition is detected.
摘要翻译： 一种用于使接地故障检测适应于电机状态变化的方法，其中所述机器包括绕组。 电机处于第一机器状态，为电量的测量值定义第一参考值。 接地故障检测包括连续测量绕组中的电量，并根据电量和第一参考值的测量值检测接地故障。 该方法包括接收信号，基于接收到的信号检测机器状态的变化，并且改变为电量的测量值的第二参考值，当第二参考值与第一参考值不同时，第二参考值不同于第一参考值 检测到机器状况。
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9.发明授权Method and device for enhancing the reliability of generator ground fault detection on a rotating electrical machine 有权用于提高旋转电机发电机接地故障检测可靠性的方法和装置公开(公告)号：US09018960B2
公开(公告)日：2015-04-28
申请号：US13972305
申请日：2013-08-21
CPC分类号： G01R31/025 , G01R27/18 , G01R31/343 , H02H1/003
摘要： A method for enhancing the reliability of generator ground fault detection based on a signal injection scheme, wherein the generator includes a winding. The method includes injecting a test signal at a predefined frequency to the winding, measuring an electrical quantity of a response signal in the winding resulted from the injected test signal, and detecting a ground fault based on the measured value of the electrical quantity. The method further includes continuously determining the frequency of the response signal, and discarding the present measured value corresponding to the determined frequency when the determined frequency deviates from the predefined frequency with a first threshold value.
摘要翻译： 一种用于增强基于信号注入方案的发电机接地故障检测的可靠性的方法，其中所述发电机包括绕组。 该方法包括将预定频率的测试信号注入绕组，测量由注入的测试信号产生的绕组中的响应信号的电量，并且基于电量的测量值检测接地故障。 该方法还包括连续地确定响应信号的频率，以及当所确定的频率偏离具有第一阈值的预定频率时，丢弃对应于所确定的频率的当前测量值。
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10.发明授权Method and system for detecting a failed rectifier in an AC/DC converter 有权用于检测AC / DC转换器故障整流器的方法和系统公开(公告)号：US08924170B2
公开(公告)日：2014-12-30
申请号：US14229279
申请日：2014-03-28
申请人： Tord Bengtsson , Stefan Roxenborg
发明人： Tord Bengtsson , Stefan Roxenborg
CPC分类号： G01R31/40 , H02H7/1255 , H02M7/066 , H02M7/1623
摘要： A device for detecting a failed rectifier in an AC/DC converter for converting three-phase AC power to DC power and having its AC side connected to a three-phase AC source and its DC side connected to a DC load, the AC/DC converter including a rectifier circuit including at least three legs, each of the legs connected to a corresponding AC phase and including at least one rectifier, the device including a measuring unit for measuring and sampling AC current for each of the phases and a calculating unit configured to estimate an instantaneous DC current based on the measured instantaneous AC currents during one period of the power supply frequency.
摘要翻译： 一种用于检测AC / DC转换器中的故障整流器的装置，用于将三相AC电力转换为DC电力并将其AC侧连接到三相AC电源并且其DC侧连接到DC负载，AC / DC 转换器，其包括包括至少三个支路的整流器电路，每个支路连接到相应的AC相并且包括至少一个整流器，该装置包括用于测量和采样每个相的AC电流的测量单元，以及配置 以在电源频率的一个周期内基于所测量的瞬时AC电流来估计瞬时DC电流。
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