公开(公告)号：US5265002A

公开(公告)日：1993-11-23

申请号：US757334

申请日：1991-09-10

申请人： Akira Bando ,  Chikara Tanaka ,  Keiji Saito ,  Tadao Kawai ,  Eizo Kita ,  Keiichi Mitsuhashi ,  Yasuteru Oono ,  Hiroto Nakagawa

发明人： Akira Bando ,  Chikara Tanaka ,  Keiji Saito ,  Tadao Kawai ,  Eizo Kita ,  Keiichi Mitsuhashi ,  Yasuteru Oono ,  Hiroto Nakagawa

IPC分类号： H02H7/12 ,  H02H7/125 ,  H02M7/12 ,  H02M7/155 ,  H02M7/162

CPC分类号： H02H7/125

摘要： A semiconductor power conversion system comprising a multiphase bridge circuit which includes semiconductor devices having a controllable firing function and a reverse blocking characteristic, a gate control circuit which gives firing commands to the semiconductor devices, a short circuiting switch in which switching devices having a controllable firing function and a reverse blocking characteristic are connected in parallel with a DC output side of the multiphase bridge circuit, and a protection control device for performing a control for protecting the multiphase bridge circuit. The protection control device includes a device for detecting a commutation failure of the multiphase bridge circuit, and a device in response to the detection of the commutation failure for producing a blocking command for blocking the firing of the semiconductor devices of the multiphase bridge circuit and producing a short-circuiting command for firing the switching device which is short-circuited which bypasses current of the commutation failure. The protection control device further includes a device for detecting ending of a short-circuit based on the ceasing of current conduction of the short circuiting switch and for halting the blocking of the firing of the semiconductor devices of the multiphase bridge circuit.

摘要翻译： 一种半导体功率转换系统，包括多相桥式电路，其包括具有可控的点火功能和反向阻断特性的半导体器件，向半导体器件发出触发命令的栅极控制电路，其中具有可控射击的开关器件的短路开关 功能和反向阻断特性与多相桥式电路的直流输出侧并联连接，以及保护控制装置，用于进行保护多相桥式电路的控制。 保护控制装置包括用于检测多相桥式电路的换向故障的装置，以及响应于检测到换向失败的装置，用于产生用于阻断多相桥式电路的半导体装置的点火的阻塞命令并产生 用于点燃短路的开关器件的短路命令，其绕过换向故障的电流。 保护控制装置还包括用于基于短路开关的电流导通的停止以及用于停止多相桥式电路的半导体装置的点火来检测短路结束的装置。

公开(公告)号：US5099409A

公开(公告)日：1992-03-24

申请号：US496302

申请日：1990-03-20

申请人： Akira Bando ,  Chikara Tanaka ,  Keiji Saito ,  Tadao Kawai ,  Eizo Kita ,  Keiichi Mitsuhashi ,  Yasuteru Ohno ,  Hiroto Nakagawa

发明人： Akira Bando ,  Chikara Tanaka ,  Keiji Saito ,  Tadao Kawai ,  Eizo Kita ,  Keiichi Mitsuhashi ,  Yasuteru Ohno ,  Hiroto Nakagawa

IPC分类号： H02H7/12 ,  H02H7/122 ,  H02H7/125 ,  H02M7/162 ,  H02P9/00

CPC分类号： H02M7/1623 ,  H02H7/1255

摘要： An improved electric power conversion system comprising a multi-phase bridge circuit composed of semiconductors such as thyristors and an associated firing circuit. It is so constructed that: if the AC input current Iac flowing in the bridge circuit is equal to or larger in value that the DC output current Idc flowing out of the bridge circuit, it will be decided than an inner defect or fault is caused, and possible expansion of inner defect will be prevented by disabling the firing circuit to extinguish the thyristors in the bridge circuit, and if the AC input current Iac is smaller than the DC output current Idc in value, the bridge is permitted to continue the operation of power conversion, thus eliminating unnecessary interruption which otherwise would be caused by exterior disturbances. Also, an improved electric power conversion system may be equipped with a device to prevent an adverse effect from being caused by abnormal rise of thyristors' temperature.

公开(公告)号：US4441032A

公开(公告)日：1984-04-03

申请号：US341575

申请日：1982-01-21

申请人： Takeichi Sakurai ,  Kiyoshi Goto ,  Hiroo Konishi ,  Tadao Kawai

发明人： Takeichi Sakurai ,  Kiyoshi Goto ,  Hiroo Konishi ,  Tadao Kawai

IPC分类号： H02J1/00 ,  H02J3/36 ,  H02M7/493

CPC分类号： H02J3/36 ,  Y02E60/60 ,  Y10T307/707

摘要： Two rectifiers and two inverters are operated under the state under which they are connected in parallel by common transmission lines. These rectifiers and inverters are controlled an independent control apparatus respectively which can selectively apply either the constant current control or the constant voltage control.The control apparatus of each converter has bestowed thereon the reference value of a current to flow through the particular converter and the reference value of a terminal voltage of the particular converter. A signal for lowering the current reference value is added to the control apparatus of one or all of the converters which are to be operated as the inverters. On the other hand, a signal for essentially rendering the terminal voltage of the converter smaller than the voltage reference value is added to the control apparatus of the converter which is to be operated as the converter for determining the voltage of a direct current system.

摘要翻译： 两个整流器和两个逆变器在通过公共传输线并联连接的状态下工作。 这些整流器和逆变器分别被控制为独立的控制装置，其可以选择性地应用恒定电流控制或恒定电压控制。 每个转换器的控制装置在其上赋予流过特定转换器的电流的参考值和特定转换器的端子电压的参考值。 用于降低电流参考值的信号被添加到要用作逆变器的一个或所有转换器的控制装置中。 另一方面，用于将转换器的端子电压基本上变成小于电压基准值的信号被添加到要用作用于确定直流系统的电压的转换器的转换器的控制装置中。

公开(公告)号：US4430683A

公开(公告)日：1984-02-07

申请号：US351766

申请日：1982-02-24

申请人： Tadao Kawai ,  Tomoharu Nakamura

发明人： Tadao Kawai ,  Tomoharu Nakamura

IPC分类号： G01R27/18 ,  G01R31/02 ,  H02H1/04 ,  H02H3/00 ,  H02H3/16 ,  H02H7/26

CPC分类号： H02H3/16 ,  G01R27/18 ,  G01R31/025 ,  H02H1/04 ,  H02H7/268

摘要： A ground detecting device for detecting a ground fault in a DC circuit, through which a DC power produced by converting a poly-phase AC power by an AC-DC converter is transmitted and which is connected at an earth point to the earth, is arranged to detect an earth current flowing through the earth point and extract a DC component, if any, from the detected earth current and to judge whether a ground fault has occurred or not by comparing the level of the DC component with a predetermined reference level.

摘要翻译： 一种用于检测DC电路中的接地故障的接地检测装置，通过该接地故障发送通过AC-DC转换器转换多相AC电力而产生的直流电力，并将其接地点连接到地线。 检测流过接地点的接地电流，并从检测到的接地电流提取直流分量（如果有的话），并通过将直流分量的电平与预定参考电平进行比较来判断接地故障是否发生。

公开(公告)号：US5428553A

公开(公告)日：1995-06-27

申请号：US482301

申请日：1990-02-20

申请人： Tomio Chiba ,  Mitsuyasu Kido ,  Tadao Kawai

发明人： Tomio Chiba ,  Mitsuyasu Kido ,  Tadao Kawai

IPC分类号： H02H3/02 ,  H02H3/00 ,  H02H3/05 ,  H02J3/00 ,  H02J3/18 ,  H02H3/42

CPC分类号： H02H3/00

摘要： A power signal processing system and method for protection of a power system has a signal input unit for receiving a signal representing a condition of a power system; a plurality of processing units cooperating to apply to the received signal a predetermined process including a series of predetermined different computations thereby producing a control signal for controlling operation of the power signal processing system. The respective processing units operate to perform the predetermined different computations, respectively. A control unit is provided for controlling transfer of data among the processing units so that the different computations are applied, successively, to the received signal thereby producing the control signal which is used to cause, for example, the issue of a cut-off command to a circuit breaker.

摘要翻译： 用于保护电力系统的电力信号处理系统和方法具有用于接收表示电力系统状况的信号的信号输入单元; 多个处理单元，协作地将接收信号应用于包括一系列预定的不同计算的预定处理，从而产生用于控制功率信号处理系统的操作的控制信号。 各个处理单元分别操作以执行预定的不同计算。 提供控制单元，用于控制处理单元之间的数据传输，使得不同的计算依次应用于接收信号，从而产生用于引起例如发出切断命令的控制信号 到断路器。

公开(公告)号：US5255202A

公开(公告)日：1993-10-19

申请号：US640595

申请日：1991-01-11

申请人： Mitsuyasu Kido ,  Tomio Chiba ,  Hiroyuki Kudo ,  Junzo Kawakami ,  Tadao Kawai

发明人： Mitsuyasu Kido ,  Tomio Chiba ,  Hiroyuki Kudo ,  Junzo Kawakami ,  Tadao Kawai

IPC分类号： H02J3/00 ,  G01R19/25 ,  H02J13/00 ,  H04B14/04 ,  G06F15/20

CPC分类号： H04B14/046 ,  G01R19/25 ,  H02J13/0048 ,  Y02B90/263 ,  Y04S40/123

摘要： Analog signals are sampled and converted into digital data which is then filtered by a digital filter. The filtered digital data is then subjected to an arithmetic operation. The blocking band of the digital filter is set to a frequency band which is above the pass band of the analog signal components. Frequency of sampling, as well as the frequency of noise caused by the sampling, is elevated, so that the noise frequency falls within the blocking band of the digital filter.