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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

US5945813A Single or isolated operation detecting apparatus for a distributed power supply 失效
标题翻译：用于分布式电源的单个或隔离的操作检测装置
公开(公告)号：US5945813A
公开(公告)日：1999-08-31
申请号：US62731
申请日：1998-04-20
申请人： Kouji Kondou , Jun Motohashi , Chikashi Nakazawa
发明人： Kouji Kondou , Jun Motohashi , Chikashi Nakazawa
IPC分类号： H02J3/24 , H02J3/38 , G05F1/70
CPC分类号： H02J3/24 , H02J3/38
摘要： The invention is directed to an apparatus for detecting if a distributed power supply is switched from cooperation with another power system to isolated or single operation. The distributed power supply includes a synchronous generator and possibly also another power source such as an induction generator. The single operation detecting apparatus includes a frequency detector connected to a line system of a customer, reactive power regulating equipment connected to the distributed power supply, a fluctuation signal generator for providing periodic small fluctuations to a reactive power setter of the reactive power regulating equipment, and a single operation signal generator for monitoring the output of the frequency detector to output a single operation signal when the monitored output deviates from a range between allowable upper and lower limits around a reference frequency. It is possible to detect the isolated or single operation mode by actively disturbing the balance between the energy generated by the distributed power supply and the power consumed by the distributed power supply, when the distributed power supply disconnected from the cooperation with power system.
摘要翻译：本发明涉及一种用于检测分布式电源是否从与另一电力系统的协作切换到隔离或单独操作的装置。分布式电源包括同步发电机，还可能包括诸如感应发电机的另一电源。单个操作检测装置包括连接到客户的线路系统的频率检测器，连接到分布式电源的无功功率调节设备，用于向无功功率调节设备的无功功率设定器提供周期性小的波动的波动信号发生器，以及单个操作信号发生器，用于当所监视的输出偏离围绕参考频率的允许上限和下限之间的范围时，监视频率检测器的输出以输出单个操作信号。通过主动干扰分布式电源产生的能量与分布式电源消耗的能量之间的平衡，当分布式电源与电力系统的配合断开时，可以检测到隔离或单一运行模式。

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