Method for operating converter circuit
    118.
    发明专利
    Method for operating converter circuit 审中-公开
    操作转换器电路的方法

    公开(公告)号:JP2008005694A

    公开(公告)日:2008-01-10

    申请号:JP2007153843

    申请日:2007-06-11

    CPC classification number: H02M1/32 G01R29/16 H02J3/1842 Y02E40/22

    Abstract: PROBLEM TO BE SOLVED: To protect a converter circuit when an asymmetric phase voltage occurs in an AC voltage network connected to the converter circuit.
    SOLUTION: The converter circuit has a converter unit 1, equipped with a plurality of controllable power semiconductor switches, and the converter unit 1 is connected on an AC-voltage side, to an AC-voltage network 2 and is controlled by a control signal S. For protecting the converter circuit, when an asymmetric phase voltage occurs in the AC-voltage network connected to the converter circuit, phase voltages (U
    Na , U
    Nb , U
    Nc ) in the AC-voltage network are calculated. Negative sequence strength of the phase voltage is calculated, and Park and Clark transformation strength of phase voltage is calculated; and when the negative sequence strength of the phase voltage exceeds a value that can be set; or if the Park and Clark transformation strength of the phase voltage drops beyond the value that can be set, the controllable power semiconductor switch will be locked by a control signal.
    COPYRIGHT: (C)2008,JPO&INPIT

    Abstract translation: 要解决的问题:为了在连接到转换器电路的交流电压网络中发生不对称相电压时保护转换器电路。 解决方案:转换器电路具有转换器单元1,其配备有多个可控功率半导体开关,并且转换器单元1在AC电压侧连接到AC电压网络2,并由一个 控制信号S.为了保护转换器电路,当在连接到转换器电路的AC电压网络中发生非对称相电压时,相电压(U SB SB,Nb SB) ,U Nc )。 计算相电压的负序强度,计算相电压的Park和Clark变换强度; 并且当相电压的负序强度超过可设定的值时; 或者如果相位电压的Park和Clark变换强度超过可设定的值,则可控功率半导体开关将被控制信号锁定。 版权所有(C)2008,JPO&INPIT

    Arc furnace power supply device
    119.
    发明专利
    Arc furnace power supply device 审中-公开
    电弧炉电源装置

    公开(公告)号:JP2007317651A

    公开(公告)日:2007-12-06

    申请号:JP2007112187

    申请日:2007-04-20

    CPC classification number: H05B7/144 H05B7/005 Y02P10/256 Y02P10/259

    Abstract: PROBLEM TO BE SOLVED: To provide an arc furnace power supply device in which stable and uniform arcs can be secured. SOLUTION: The arc furnace power supply device includes a commutator (1) which can be connected with an AC voltage supply network (2) on its AC voltage side and connected with a DC voltage circuit (3) on its DC voltage side. Furthermore, the arc furnace power supply device has an inverter (4) which is connected with the DC voltage circuit (3) on its DC voltage side and is connected with at least one arc electrode (5) on its AC voltage side. In order to improve a generation of stable and uniform arcs, the above inverter (4) is designed to give a rectangular AC voltage to the arc electrode (5). COPYRIGHT: (C)2008,JPO&INPIT

    Abstract translation: 要解决的问题:提供一种能够确保稳定且均匀的弧的电弧炉供电装置。 解决方案:电弧炉电源装置包括一个换向器(1),该换向器可以在其交流电压侧与一个交流电压网络(2)连接,并与其直流电压侧的直流电压电路(3)连接 。 此外,电弧炉供电装置具有逆变器(4),其在直流电压侧与直流电压电路(3)连接,并且在其交流电压侧与至少一个电弧电极(5)连接。 为了改善产生稳定和均匀的电弧,上述逆变器(4)被设计成向电弧电极(5)提供矩形AC电压。 版权所有(C)2008,JPO&INPIT

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