公开(公告)号：US5452196A

公开(公告)日：1995-09-19

申请号：US281785

申请日：1994-07-28

申请人： Katsuro Itoh

发明人： Katsuro Itoh

IPC分类号： H02H7/12 ,  H02M1/00 ,  H02M1/092 ,  H03K17/082 ,  H03K17/10 ,  H03K17/79 ,  H02H7/125

CPC分类号： H02H7/1206 ,  H02M1/092 ,  H03K17/0824 ,  H03K17/105 ,  H03K17/79

摘要： A protection system for a thyristor valve composed of a plurality of thyristors connected in series. The protection system includes a forward voltage detection circuit for generating a forward voltage signal, a first reverse voltage detection circuit for detecting that a reverse voltage in excess of a first reverse voltage level is applied to the thyristor to generate a first reverse voltage signal, and a second reverse voltage detection circuit for detecting that a reverse voltage in excess of a second reverse voltage level larger than the first reverse voltage level is applied to the thyristor to generate a second reverse voltage signal. The protection system further includes a protection circuit for detecting a first time period during when the first reverse voltage signal is outputted and a second time period during when the first reverse voltage signal is outputted and the second reverse voltage signal is not outputted, for adding the first and the second time periods to generate an addition signal, for generating a decision signal when the addition signal is smaller than a second predetermined value, and for generating a protection gate pulse based on the decision signal when the forward voltage is applied to the thyristor. The protection gate pulse is applied to all of the thyristors.

摘要翻译： 一种由串联连接的多个晶闸管组成的可控硅阀的保护系统。 保护系统包括用于产生正向电压信号的正向电压检测电路，用于检测超过第一反向电压电平的反向电压被施加到晶闸管以产生第一反向电压信号的第一反向电压检测电路，以及 第二反向电压检测电路，用于检测超过第一反向电压电平的第二反向电压电平的反向电压被施加到晶闸管以产生第二反向电压信号。 该保护系统还包括保护电路，用于检测在输出第一反向电压信号期间的第一时间段和在输出第一反向电压信号期间的第二时间段，并且不输出第二反向电压信号， 第一和第二时间段，用于产生相加信号，用于当加法信号小于第二预定值时产生判定信号，并且当正向电压施加到晶闸管时，基于判定信号产生保护门脉冲 。 保护门脉冲施加到所有晶闸管。

公开(公告)号：US4680691A

公开(公告)日：1987-07-14

申请号：US871365

申请日：1986-06-06

申请人： Teruo Yoshino ,  Katsuro Itoh

发明人： Teruo Yoshino ,  Katsuro Itoh

IPC分类号： H02M7/155 ,  H02J3/36 ,  H02M7/757 ,  H02H7/00

CPC分类号： H02J3/36 ,  H02M7/7575 ,  Y02E60/60

摘要： A synchronous condenser is provided on an AC bus line which is connected to an AC power system via a circuit breaker. The AC bus line and a DC bus line are connected via a power converter system. In such a system, if three conditions: the breaker is opened; the synchronous condenser is under operation; and the power converter operates as an inverter, are met, the power converter is driven into a zero power factor operation, i.e., an operation to cancel a capacitive reactive power on the AC bus line including AC filters in order to prevent the synchronous condenser self-excitation.

摘要翻译： 在AC总线上设置同步电容器，AC总线通过断路器连接到AC电力系统。 AC总线和DC总线通过电源转换器系统连接。 在这种系统中，如果三个条件：断路器打开; 同步冷凝器正在运行; 并且功率转换器作为逆变器工作时，功率转换器被驱动到零功率因数操作，即消除包括AC滤波器的AC总线上的容性无功功率的操作，以防止同步电容器自身 -励磁。

公开(公告)号：US5434772A

公开(公告)日：1995-07-18

申请号：US217022

申请日：1994-03-24

申请人： Katsuro Itoh

发明人： Katsuro Itoh

IPC分类号： H02J1/00 ,  H02M1/00 ,  H02M1/092 ,  H02M7/493 ,  H03K17/06 ,  H03K17/10 ,  H02M3/24

CPC分类号： H02M1/092 ,  H03K17/06 ,  H03K17/10

摘要： A device for controlling a thyristor converter including series connected thyristors. The device includes a plurality of forward voltage detection circuits, each of which detects forward voltage of one of the thyristors and generates a forward voltage signal based on the detected forward voltage, respectively. The device includes a first circuit for generating a conduction command signal which commands the thyristor converter to conduct, and a second circuit for generating a plurality of light gate signals and a gate monitoring signal based on a plurality of modified forward voltage signals and the conduction command signal. Each of the light gate signals is applied to one of the thyristors to turn ON thereof, respectively. The device includes a first delay circuit connected to receive the gate monitoring signal for delaying the gate monitoring signal by a first predetermined time to produce a first delayed signal. The device further includes a processing circuit connected to receive the first delayed signal and a plurality of the forward voltage signals for detecting whether or not any of the plurality of forward voltage detection circuits is in a failure, for distinguishing the forward voltage detection circuit in a failure and for generating a plurality of the modified forward voltage signals based on the result of the failure detection and the distinction, thereby inhibiting the forward voltage signal of the forward voltage detection circuit in a failure from transmitting to said second circuit.

摘要翻译： 一种用于控制晶闸管转换器的装置，包括串联连接的晶闸管。 该装置包括多个正向电压检测电路，每个正向电压检测电路分别检测晶闸管之一的正向电压，并分别基于检测到的正向电压产生正向电压信号。 该装置包括用于产生命令晶闸管转换器导通的导通命令信号的第一电路和用于产生多个光栅信号的第二电路和基于多个修正的正向电压信号的栅极监视信号和导通命令 信号。 每个光栅信号分别被施加到一个晶闸管导通。 该装置包括连接以接收门监视信号的第一延迟电路，用于将门监视信号延迟第一预定时间以产生第一延迟信号。 该装置还包括连接以接收第一延迟信号的处理电路和用于检测多个正向电压检测电路中的任何一个是否处于故障的多个正向电压信号，以区分正向电压检测电路 故障并且用于基于故障检测和区分的结果产生多个经修改的正向电压信号，由此阻止正向电压检测电路的正向电压信号发送到所述第二电路。