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    VARIABLE FREQUENCY SPEED CONTROL SYSTEM AND METHOD OF THE SAME
    2.
    发明公开
    VARIABLE FREQUENCY SPEED CONTROL SYSTEM AND METHOD OF THE SAME 审中-公开
    GESCHWINDIGKEITSKONTROLLSYSTEM MIT VARIABLER FREQUENZ UND VERFAHRENDAFÜR

    公开(公告)号：EP2950443A1

    公开(公告)日：2015-12-02

    申请号：EP15169943.6

    申请日：2015-05-29

    申请人： Delta Electronics (Shanghai) Co., Ltd.

    发明人： LIU, Bin ,  WANG, Zheng ,  ZHANG, Yi ,  GAN, Hong-Jian ,  YING, Jian-Ping

    IPC分类号： H02P27/04 ,  H02P27/06

    CPC分类号： H02P6/08 ,  H02P27/047 ,  H02P27/06

    摘要： A variable frequency speed control system having a low voltage ride through function that includes a variable frequency drive having a rectifier, a DC bus and an inverter is provided. The variable frequency speed control system includes a voltage drop detecting module, a frequency control module, an operation mode selecting module and an inverter control module. The voltage drop detecting module generates a voltage drop coefficient according to a grid voltage and a rated grid voltage and generates an operation mode switching signal. The operation mode selecting module receives a target frequency signal and a frequency decreasing amount and generates an output frequency signal according to the operation mode switching signal. The inverter control module generates a three phase modulating signal according to the output frequency signal, which is used to control the operation of the inverter.

    摘要翻译： 提供一种具有低电压穿越功能的变频调速系统，其包括具有整流器，DC总线和逆变器的变频驱动器。 变频调速系统包括压降检测模块，频率控制模块，操作模式选择模块和逆变器控制模块。 电压降检测模块根据电网电压和额定电网电压产生电压降系数，并产生运行模式切换信号。 操作模式选择模块接收目标频率信号和频率减少量，并根据操作模式切换信号产生输出频率信号。 逆变器控制模块根据输出频率信号生成三相调制信号，用于控制变频器的运行。