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    CONTROL METHOD FOR LOW VOLTAGE RIDE THROUGH
    1.
    发明申请
    CONTROL METHOD FOR LOW VOLTAGE RIDE THROUGH 审中-公开
    低电压控制方法

    公开(公告)号：US20120280665A1

    公开(公告)日：2012-11-08

    申请号：US13514499

    申请日：2010-10-25

    申请人： Liying Su ,  Haibin Jing ,  Song Yang ,  Ying Yuan

    发明人： Liying Su ,  Haibin Jing ,  Song Yang ,  Ying Yuan

    IPC分类号： H02P9/10

    CPC分类号： H02M1/32 ,  H02H3/066 ,  H02H3/087 ,  H02H9/041 ,  H02J3/24 ,  H02J3/386 ,  H02P9/007 ,  Y02E10/763

    摘要： A control method for low voltage ride through comprises the following steps: 1) A control circuit (9) monitors a DC bus voltage of a set of frequency converters (3, 4) connected between a wind generator rotor and a power grid (12) and a voltage of the power grid; 2) If the monitored DC bus voltage of the set of frequency converters is judged to be higher than a designed value, the control circuit controls a thyristor (7) in a crowbar protection circuit connected to the wind generator rotor to be closed to obtain a shunt protection; 3) After the thyristor is closed, the control circuit controls a stator breaker (1) which is connected between a wind generator stator and the power grid to disconnect the wind generator stator and the power grid; 4) After the stator breaker disconnects the power grid and the wind generator stator, the control circuit further controls a breaker (5) of a shunt circuit to be opened firstly and then be closed, the thyristor is turned off automatically, and thus the protection function of the shunt circuit is recovered; 5) This state is maintained until the control circuit monitors a recovery of the voltage of the power grid, a generator synchronous control breaker is closed rapidly, and a normal operation is recovered. The control method provides low voltage ride through performance with a simple control strategy.

    摘要翻译： 一种用于低电压穿越的控制方法包括以下步骤：1）控制电路（9）监视连接在风力发电机转子和电网（12）之间的一组变频器（3,4）的直流母线电压， 和电网电压; 2）如果将变频器组的监控直流母线电压判断为高于设计值，则控制电路控制与风力发电机转子连接的短路保护电路中的晶闸管（7）关闭以获得 分流保护; 3）晶闸管闭合后，控制电路控制一个连接在风力发电机定子和电网之间的定子断路器（1），以断开风力发电机定子和电网; 4）定子断路器断开电网和风力发电机定子后，控制电路进一步控制分流电路的断路器（5）先打开，然后闭合，晶闸管自动关断，从而保护 回路分流电路的功能; 5）保持该状态，直到控制电路监视电网的电压恢复，发电机同步控制断路器快速闭合，恢复正常运行。 控制方法通过简单的控制策略提供低电压乘车性能。

    PULSE CURRENT SENSOR AND LIGHTNING PROTECTION CABINET WITH SURGE WAVE RECORDING COMPOSED OF THE SENSOR
    5.
    发明申请
    PULSE CURRENT SENSOR AND LIGHTNING PROTECTION CABINET WITH SURGE WAVE RECORDING COMPOSED OF THE SENSOR 审中-公开
    脉冲电流传感器和具有传感器组合的波浪记录的防雷保护柜

    公开(公告)号：US20130088804A1

    公开(公告)日：2013-04-11

    申请号：US13581822

    申请日：2010-04-20

    申请人： Huaijun Liang ,  Ying Yuan

    发明人： Huaijun Liang ,  Ying Yuan

    IPC分类号： H02H3/08 ,  G01R19/15

    CPC分类号： H02H3/085 ,  G01R15/186 ,  G01R19/15

    摘要： A pulse current sensor and a lightning protection cabinet with surge wave recording composed of the sensor are provided. The pulse current sensor includes a pair of semi-circular magnetic cores which are installed oppositely, air gaps between the two semi-circular magnetic cores, nonmagnetic electric metal rings sleeved outside the air gaps, whose inner hole axis is consistent with the magnetic force line of the semi-circular magnetic cores, and coils wound on the semi-circular magnetic cores, and out-put terminals led from the coils. The pulse current senor is disposed on the ground line, and the two nonmagnetic electric metal rings are respectively installed in the two symmetrical air gaps of the two semi-circular magnetic cores in the pulse current sensor. Under the action of the two semi-circular magnetic cores, the phenomenon of magnetic saturation does not occur in the pulse current sensor, and the output precision and the output range of the pulse current sensor are improved.

    摘要翻译： 提供了一个脉冲电流传感器和一个由传感器组成的浪涌波记录的防雷柜。 脉冲电流传感器包括一对相对安装的半圆形磁芯，两个半圆磁芯之间的气隙，套在气隙外部的非磁性电金属环，其内孔轴与磁力线一致 的半圆形磁芯和缠绕在半圆形磁芯上的线圈以及从线圈引出的输出端子。 脉冲电流传感器设置在接地线上，两个非磁性电金属环分别安装在脉冲电流传感器中两个半圆磁芯的两个对称气隙中。 在两个半圆磁芯的作用下，脉冲电流传感器不会发生磁饱和现象，提高了脉冲电流传感器的输出精度和输出范围。