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    METHOD TO ESTIMATE AN EQUIVALENT GRID IMPEDANCE FOR POWER GENERATORS
    1.
    发明申请
    METHOD TO ESTIMATE AN EQUIVALENT GRID IMPEDANCE FOR POWER GENERATORS 审中-公开
    估算发电机等效网格阻抗的方法

    公开(公告)号：WO2018060130A1

    公开(公告)日：2018-04-05

    申请号：PCT/EP2017/074206

    申请日：2017-09-25

    Applicant: ABB SCHWEIZ AG

    Inventor： ROHR, Eduardo ,  AL-HOKAYEM, Peter ,  BAECHLE, Mathias

    IPC: G01R27/16 ,  G01R19/25

    Abstract: A method for estimating an equivalent impedance (Z eq ) of a power grid (18) comprises: measuring a plurality of measurement values of a generator voltage (V gen ) and a generator current (I gen ) of at least one generator (12) connected to the power grid (18); generating a performance index (J) from the plurality of measurement values, the performance index being a function of the measurement values and the grid impedance (Z eq ); and determining an equivalent impedance (Z eq ) as the grid impedance, which minimizes the performance index (J). The performance index (J) is additionally a function of an angular error (δ), which accounts for a deviation of a grid frequency at a measurement of a measurement value from a nominal grid frequency, and the performance index (J) is additionally minimized with respect to the angular error (δ).

    Abstract translation: 一种用于估计电网（18）的等效阻抗（Z≠eq）的方法包括：测量发电机电压（V sub）的多个测量值， （18）连接的至少一个发电机（12）的发电机电流（I gen）和发电机电流（I gen）。 从所述多个测量值生成性能指标（J），所述性能指标是所述测量值和所述电网阻抗（Z eqq）的函数; 并确定与电网阻抗等效的阻抗（Z eqq），这最小化了性能指数（J）。 性能指标（J）另外是角度误差（δ）的函数，其考虑了测量值与标称电网频率的测量值处的电网频率的偏差，并且性能指标（J）被额外地最小化 关于角度误差（δ）。

    METHOD TO ESTIMATE AN EQUIVALENT GRID IMPEDANCE FOR POWER GENERATORS
    2.
    发明公开
    METHOD TO ESTIMATE AN EQUIVALENT GRID IMPEDANCE FOR POWER GENERATORS 审中-公开

    公开(公告)号：EP3519837A1

    公开(公告)日：2019-08-07

    申请号：EP17776996.5

    申请日：2017-09-25

    Applicant: ABB Schweiz AG

    Inventor： ROHR, Eduardo ,  AL-HOKAYEM, Peter ,  BAECHLE, Mathias

    IPC: G01R27/16 ,  G01R19/25

    Abstract: 1. A method for estimating an equivalent impedance ( Z eq ) of a power grid (18) comprises: measuring a plurality of measurement values of a generator voltage ( V gen ) and a generator current ( I gen ) of at least one generator (12) connected to the power grid (18); generating a performance index ( J ) from the plurality of measurement values, the performance index being a function of the measurement values and the grid impedance ( Z eq ); and determining an equivalent impedance ( Z eq ) as the grid impedance, which minimizes the performance index ( J ).

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