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1. 发明授权

US5808449A Method and apparatus for detecting islanding operation of dispersed generator 失效
标题翻译：用于检测分散发电机孤岛运行的方法和装置
公开(公告)号：US5808449A
公开(公告)日：1998-09-15
申请号：US655817
申请日：1996-05-31
申请人： Yoshiyuki Hirayama , Nobuhiro Kuroda , Takaaki Kai , Toshiaki Fujimoto , Haruo Sasaki , Yasutomo Imai , Jun Motohashi , Hirotoshi Kaneda
发明人： Yoshiyuki Hirayama , Nobuhiro Kuroda , Takaaki Kai , Toshiaki Fujimoto , Haruo Sasaki , Yasutomo Imai , Jun Motohashi , Hirotoshi Kaneda
IPC分类号： H02J3/46 , H02P9/10
CPC分类号： H02J3/46 , H02J2003/388 , Y10T307/664
摘要： A method for detecting islanding operation of a rotating-machine type dispersed generator. The dispersed generator is interconnected with a main electric source through a circuit breaker to constitute an electric power system. The estimating method is implemented as follows: (a) changing electric power of the electric power system; (b) detecting frequency component of the electric power; and (c) deciding that an islanding operation of the dispersed generator is executed if the change of the frequency component becomes greater than a predetermined value. With this method, it becomes possible to detect the islanding operation of the dispersed generator even if the power flow at the interconnecting circuit breaker is generally zero.
摘要翻译：一种用于检测旋转机型分散式发电机的孤岛操作的方法。分散式发电机通过断路器与主电源互连，构成电力系统。估算方法如下：（a）改变电力系统的电力; （b）检测电力的频率分量; 以及（c）如果频率分量的变化变得大于预定值，则决定执行分散发电机的孤岛作用。利用这种方法，即使互连断路器的功率流通常为零，也可以检测分散发电机的孤岛作用。

2. 发明授权

US4129818A Excitation control apparatus suited for normal stop operation of synchronous generators 失效
标题翻译：励磁控制装置适用于同步发电机的正常停机运行
公开(公告)号：US4129818A
公开(公告)日：1978-12-12
申请号：US806862
申请日：1977-06-15
申请人： Masuo Goto , Akira Isono , Yasushi Momochi , Takaaki Kai
发明人： Masuo Goto , Akira Isono , Yasushi Momochi , Takaaki Kai
IPC分类号： H02P9/08 , H02P3/06
CPC分类号： H02P9/08
摘要： Disclosed is an apparatus for carrying out normal stop of a synchronous generator in an advantageous manner without use of a field breaker. The apparatus comprises a six-phase thyristor converter for controlling field excitation of the synchronous generator in dependence upon terminal voltage thereof, which converter exhibits not only a forward conversion function (power rectifier) but also backward conversion function (power inverter). When a generator operation stop command is produced, the operation of the converter in power rectifier mode is changed over to power inverter mode. During the inverter mode operation, when the terminal voltage of the synchronous generator becomes lower than a preset value, a pair of counter part thyristors among the thyristors constituting the converter are simultaneously fired to bring about a short-circuited state in the excitation circuit with all the firing pulses supplied to the other thyristors being suppressed, thereby to complete the stopping operation for the synchronous generator.
摘要翻译：公开了一种用于在不使用断路器的情况下以有利的方式执行同步发电机的正常停止的装置。该装置包括用于根据其端电压来控制同步发电机的场激励的六相晶闸管转换器，该转换器不仅显示正向转换功能（功率整流器）而且还具有反向转换功能（功率逆变器）。当产生发电机运行停止指令时，将功率整流模式下的转换器的动作转换为电力逆变器模式。在逆变器模式操作期间，当同步发电机的端子电压变得低于预设值时，构成转换器的晶闸管之间的一对对置部分晶闸管被同时点火，以在所有激励电路中产生短路状态供给到其他晶闸管的点火脉冲被抑制，从而完成同步发电机的停止动作。

3. 发明授权

US4343027A Common suspension multi-line grounding protective relay 失效
标题翻译：普通悬挂多线接地保护继电器
公开(公告)号：US4343027A
公开(公告)日：1982-08-03
申请号：US152760
申请日：1980-05-23
申请人： Takaaki Kai
发明人： Takaaki Kai
IPC分类号： H02H3/16 , H02H3/36 , H02H3/38 , H02H7/26
CPC分类号： H02H3/165 , H02H3/36 , H02H7/267
摘要： The present invention discloses a grounding protective relay which compensates for zero phase circulation current between lines and zero phase vertical voltage drops generated by induction in a common suspension multiline system. The grounding protective relay comprises, substantially, a current detector which detects the inter-line differential currents, a filter which eliminates the positive phase component from the inter-line differential current of each pair of phases, calculating sections calculate the zero phase component, the ratio of the magnitudes and the phase difference, an grounded phase detector, and a selection section which selects, according to the phase which is grounded, a deriveration result from a calculating section, characterized in that, when a grounded fault occurs, the zero phase circulation current is selected and is compensated.
摘要翻译：本发明公开了一种接地保护继电器，其补偿线路之间的零相循环电流和在公共悬架多线系统中通过感应产生的零相垂直电压降。接地保护继电器基本上包括检测线间差动电流的电流检测器，从每对相的线间差动电流中消除正相分量的滤波器，计算部分计算零相分量，大小和相位差的比值，接地相位检测器和选择部分，其根据接地的相位选择来自计算部分的转折结果，其特征在于，当接地故障发生时，零相位循环电流被选择并被补偿。

4. 发明授权

US4245182A Excitation control apparatus for a generator 失效
标题翻译：发电机励磁控制装置
公开(公告)号：US4245182A
公开(公告)日：1981-01-13
申请号：US891001
申请日：1978-03-28
申请人： Hiroaki Aotsu , Akira Isono , Masuo Goto , Koichi Kimura , Yasushi Momochi , Takaaki Kai , Satoshi Kitamura , Akihisa Kaihara , Hirosi Okada
发明人： Hiroaki Aotsu , Akira Isono , Masuo Goto , Koichi Kimura , Yasushi Momochi , Takaaki Kai , Satoshi Kitamura , Akihisa Kaihara , Hirosi Okada
IPC分类号： H02J3/50 , H02P9/10 , H02P9/14 , H02P9/30
CPC分类号： H02P9/10 , H02P9/30 , Y10S174/15 , Y10T307/718
摘要： A field control apparatus for a generator having a field winding comprises a terminal voltage control unit for controlling a field current of the generator in accordance with a difference between a terminal voltage signal of the generator and a reference voltage signal, which control unit has at least one of a line drop compensation function, an under-excitation limitation function, an over-excitation limitation function, a power factor regulation function, an armature winding over-current compensation function and a cross-current compensation function. The field control apparatus includes a detector as a common signal source for detecting active power and reactive power components at an output terminal of the generator and means responsive to the output of the detector for performing scalar operation in accordance with a function of the added compensation/control function described above. An output of the operating means is added to the differential signal as an added function signal to control the field current for excitation of the field winding.
摘要翻译：一种具有励磁绕组的发电机的现场控制装置，包括端子电压控制单元，用于根据发电机的端子电压信号与参考电压信号之间的差值控制发电机的励磁电流，该控制单元至少具有线路补偿功能，励磁限制功能，过励磁限制功能，功率因数调节功能，电枢绕组过电流补偿功能和交叉电流补偿功能之一。现场控制装置包括作为公共信号源的检测器，用于在发生器的输出端子处检测有功功率和无功功率分量，并且响应于检测器的输出，根据附加补偿/补偿的函数进行标量运算的装置，上述控制功能。操作装置的输出作为附加功能信号加到差分信号上，以控制用于励磁绕组的励磁电流。

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