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    ELECTRICITY CONVERSION DEVICE
    3.
    发明公开
    ELECTRICITY CONVERSION DEVICE 审中-公开
    ELEKTRIZITÄTSUMWANDLUNGSVORRICHTUNG

    公开(公告)号：EP2611021A4

    公开(公告)日：2017-03-29

    申请号：EP10856387

    申请日：2010-08-23

    申请人： TOSHIBA MITSUBISHI-ELECTRIC IND SYSTEMS CORP

    发明人： FUJII YOSUKE ,  IKAWA EIICHI ,  AMBOH TATSUAKI

    IPC分类号： H02M7/487 ,  H02J3/38 ,  H02M7/5395

    CPC分类号： H02M7/487 ,  H02J3/24 ,  H02J3/383 ,  H02M7/5395 ,  Y02E10/563

    摘要： There is provided a power conversion apparatus including a power converter being so configured that an alternating-current switch constituted of a series connection of two valve devices each constituted of a semiconductor element and a diode connected in inverse parallel with the semiconductor element is connected between a connection point of the valve devices and a connection point of the direct-current power supplies in each arm, and each of the alternating-current switches is turned on or off, thereby enabling the power converter to perform three-level operation or two-level operation. The power conversion apparatus includes a comparison circuit (9) which compares a determination element related to a loss in the power converter with a switching reference value and outputs a determination instruction when a difference has occurred between the determination element and the switching reference value, a determination circuit (11) which determines whether the determination element is greater or less than the switching reference value when having received a determination instruction from the comparison circuit (9), and outputs a two-level operation switching instruction when the determination element is greater than or equal to the switching reference value, and a switching circuit (12) which, when having received a two-level operation switching instruction from the determination circuit (11), turns off the alternating-current switch and turns on the valve devices in the arm sequentially, thereby bringing the power converter into a two-level operation state.

    摘要翻译： 提供了一种电力转换装置，其包括功率转换器，该功率转换器被构造成使得由半导体元件和与半导体元件反向并联连接的二极管的两个阀装置的串联连接构成的交流开关连接在 阀装置的连接点和每个臂中的直流电源的连接点，并且每个交流开关被接通或断开，从而使电力转换器能够执行三电平操作或两级 操作。 功率转换装置包括比较电路（9），其将与功率转换器的损耗有关的确定元件与开关基准值进行比较，并且当确定元件和开关基准值之间出现差异时，输出确定指令， 确定电路（11），其在从所述比较电路（9）接收到确定指示时，判定所述判定元件是否大于或小于所述切换基准值，并且当所述判定元件大于所述判定元件时，输出二电平动作切换指示 或者等于开关基准值的开关电路（12），当接收到来自判定电路（11）的二电平动作切换指示时，断开交流开关，并将该装置接通 从而使功率转换器进入两级操作状态。