ISLANDING DETECTION IN AN ELECTRICAL POWER GRID
    1.
    发明申请
    ISLANDING DETECTION IN AN ELECTRICAL POWER GRID 审中-公开
    电网中的岛屿检测

    公开(公告)号:WO2017174797A1

    公开(公告)日:2017-10-12

    申请号:PCT/EP2017/058432

    申请日:2017-04-07

    Applicant: ABB SCHWEIZ AG

    Abstract: A method for islanding detection in an electrical power grid (18) supplied by an electrical power source (12) comprises: measuring an output voltage ( V pcc ) and a grid current ( I g ) at an interconnection point (16) of the power source (12) with the power grid (18); estimating at least one grid parameter from the output voltage ( V pcc ) and the grid current ( I g ) based on optimizing a cost function, which minimizes a difference between the measured output voltage( V pcc ) and an estimated output voltage or a difference between the measured grid current ( I g ) and an estimated grid current, which estimated output voltage or estimated output current is a function of the measured grid current ( I g ) or the measured output voltage ( V pcc ) and the least one estimated grid parameter; and detecting an islanding condition by detecting a jump (32) and/or a deviation (34) in the at least one estimated grid parameter.

    Abstract translation: 一种用于由电源(12)供应的电力电网(18)中的孤岛检测的方法包括:测量输出电压(V (16)处的电网电流(I g)和电网电流(I g) 源(12)与电网(18); 从输出电压(vpcc)和电网电流(i pcc)估计至少一个电网参数。 基于对成本函数进行优化的成本函数来最小化所测量的输出电压(Vcc_pcc) )和估计的输出电压或所测量的电网电流(I gg)与估计的电网电流之间的差值,其中 估计的输出电压或估计的输出电流是所测量的电网电流(I gg)或所测量的输出电压(V pcc )和至少一个估计的电网参数; 以及通过检测所述至少一个估计的电网参数中的跳跃(32)和/或偏差(34)来检测孤岛条件。

    POWER GENERATION SYSTEMTECHNICAL FIELD
    2.
    发明申请

    公开(公告)号:WO2018193106A1

    公开(公告)日:2018-10-25

    申请号:PCT/EP2018/060216

    申请日:2018-04-20

    Applicant: ABB SCHWEIZ AG

    Abstract: The invention relates to a power generation system, comprising a synchronous generator (3) for converting mechanical power into electrical power at an output side configured for connecting an AC power grid (1), a first rectifier (12) and a second rectifier (13) each having an AC side (14) connected to the output side of the generator (3) and a DC side (15), an exciter (9) configured for exciting the, and a selector device (18) having an input side (17) and an output side (19), the input side (17) connected to the DC side (15) of the first rectifier (12) and to the DC side (15) of the second rectifier (13) and the output side (19) connected to the exciter (9), whereby the selector device (18) is configured for switching the DC sides (15) in series or in parallel or for transmitting DC power from the first rectifier (12) and the second rectifier (13) corresponding to an arbitrary split ratio to the output side (19).

    AUTOMATICALLY DETERMINING CONTROL PARAMETERS FOR A VOLTAGE REGULATOR OF A SYNCHRONOUS MACHINE

    公开(公告)号:WO2020244769A1

    公开(公告)日:2020-12-10

    申请号:PCT/EP2019/064887

    申请日:2019-06-06

    Applicant: ABB SCHWEIZ AG

    Abstract: A synchronous machine (12) comprises a stator (22) with stator windings (18) connected with stator terminals (20) to an electrical grid (16) and a rotor (24) with rotor windings (26) rotatable mounted in the stator (22), wherein a voltage regulator (14) of the synchronous machine (12) is adapted for outputting an excitation signal ( u ) to adjust a current in the rotor windings (26) for controlling the synchronous machine (12). A method for determining control parameters (54) for the voltage regulator (14) comprises: receiving a first time series of values of the excitation signal ( u ) and a second time series of measurement values of a terminal voltage ( y ) in the stator terminals (20), wherein the first time series and the second time series are acquired over a time interval; determining coefficients (52) of a system transfer function ( G(s) ) of the synchronous machine (12), wherein the system transfer function (G(s j) is a rational function, wherein the coefficients (52) of the system transfer function ( G(s) ) are determined recursively with a regression analysis with instrumental variables based on the first time series as system input and the second time series as system output; and determining the control parameters (54) for the voltage regulator (14) from the coefficients (52) of the system transfer function ( G(s) ) by comparing a closed loop transfer function formed of a controller transfer function ( C(s) ) of the voltage regulator (14) and the system transfer function ( G(s) ) with a desired closed loop transfer function.

    CONTROLLING A THREE-PHASE ELECTRICAL CONVERTER
    4.
    发明申请
    CONTROLLING A THREE-PHASE ELECTRICAL CONVERTER 审中-公开
    控制三相电力转换器

    公开(公告)号:WO2017013125A1

    公开(公告)日:2017-01-26

    申请号:PCT/EP2016/067200

    申请日:2016-07-19

    Applicant: ABB SCHWEIZ AG

    Abstract: A method for controlling a three-phase electrical converter (12) comprises: selecting a three-phase optimized pulse pattern (20) from a table (22) of precomputed optimized pulse patterns based on a reference flux (ψ αβ,ref ); determining a two-component optimal flux {ψ* αβ ) from the optimized pulse pattern (20) and determine a one-component optimal third variable (ζ*); determining a two-component flux error from a difference of the optimal flux ( ψ* αβ ) and an estimated flux (ψ αβ ) estimated based on measurements in the electrical converter; determining a one-component third variable error from a difference of the optimal third variable (ζ*) and an estimated third variable (ζ); modifying the optimized pulse pattern (20) by time-shifting switching instants (28) of the optimized pulse pattern (20) such that a cost function depending on the time-shifts is minimized, wherein the cost function comprises a flux error term and a third variable error term, wherein the flux error term is based on a difference of the flux error and a flux correction function providing a flux correction based on the time-shifts and the third variable error term is based on a difference of the third variable error and a third variable correction function providing a third variable correction based on the time-shifts; and applying the modified optimized pulse pattern (26) to the electrical converter (12).

    Abstract translation: 一种用于控制三相电转换器(12)的方法包括:基于参考通量(ψαβ,ref)从预先计算的优化脉冲模式的表(22)中选择三相优化脉冲模式(20); 从优化的脉冲模式(20)确定双分量最优通量{ψ*αβ),并确定单分量最优第三变量(ζ*); 根据最佳通量(ψ*αβ)的差和基于电转换器中的测量估计的估计通量(ψαβ)确定双分量磁通误差; 根据最佳第三变量(ζ*)和估计的第三变量(ζ)的差确定单分量第三变量误差; 通过对优化的脉冲模式(20)的切换时刻(28)进行时移,从而使得根据时移的成本函数最小化来修改优化的脉冲模式(20),其中成本函数包括通量误差项和 第三可变误差项,其中所述通量误差项基于所述通量误差的差和基于所述时移提供磁通校正的磁通校正函数,并且所述第三可变误差项基于所述第三可变误差的差 以及第三可变校正函数,其基于时移提供第三​​可变校正; 以及将修改的优化脉冲模式(26)应用于电转换器(12)。

    METHOD TO ESTIMATE AN EQUIVALENT GRID IMPEDANCE FOR POWER GENERATORS
    5.
    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

    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)。

    DETERMINING A FUNDAMENTAL COMPONENT OF AN AC VOLTAGE
    6.
    发明申请
    DETERMINING A FUNDAMENTAL COMPONENT OF AN AC VOLTAGE 审中-公开
    确定交流电压的基础元件

    公开(公告)号:WO2017084905A1

    公开(公告)日:2017-05-26

    申请号:PCT/EP2016/076859

    申请日:2016-11-07

    Applicant: ABB SCHWEIZ AG

    CPC classification number: H02J3/40 G01R19/2513 G01R25/00 H02M1/082 H02M5/4585

    Abstract: A method for estimating a fundamental component (A) of an AC voltage ( V pcc ) comprises: receiving a timely varying measurement signal of the AC voltage ( V pcc ); parametrizing a fundamental component (A) of the AC voltage ( V pcc ), the fundamental component (A) having a rated frequency, a variable amplitude and a variable phase shift; and determining parameters (B) of the fundamental component (A) based on minimizing a cost function ( J ), wherein the cost function ( J ) is based on an integral of a norm of a difference between the measurement signal and the parametrized fundamental component via a time horizon (h ), the time horizon ( h ) starting at an actual time point and going back via a predefined length. The cost function ( J ) comprises a term based on a norm of the difference between a value of the fundamental component ( ) at the actual time point and a value of a previously estimated fundamental component ( ) at the actual time point, whereby the previously estimated fundamental component has been determined for a previous time point.

    Abstract translation: 用于估计AC电压(Vcc)的基波分量(A)的方法包括:接收 交流电压(Vcc)的及时变化的测量信号; 参数化AC电压(Vcc)的基波分量(A),具有额定频率的基波分量(A),变量 幅度和可变相移; 和基于最小化成本函数(J)确定基本成分(A)的参数(B),其中成本函数(J)基于 测量信号和参数化的基本分量之间经由时间范围(h),时间范围(h)开始的实际时间点处的时间范围 通过预定义的长度返回。 成本函数(J)包括基于在实际时间点处的基本分量()的值与在该时间点处的先前估计的基本分量()的值之间的差的范数的项 实际时间点,由此先前估计的基本分量已经为前一时间点确定。

    CONTROL OF ELECTRICAL CONVERTER BASED ON OPTIMIZED PULSE PATTERNS
    7.
    发明申请
    CONTROL OF ELECTRICAL CONVERTER BASED ON OPTIMIZED PULSE PATTERNS 审中-公开
    基于优化脉冲模式的电动转换器控制

    公开(公告)号:WO2017005906A1

    公开(公告)日:2017-01-12

    申请号:PCT/EP2016/066291

    申请日:2016-07-08

    Applicant: ABB SCHWEIZ AG

    Abstract: A method for operating an electrical converter (12) comprises: determining an optimized pulse pattern (I) from a fundamental voltage reference (II) for the electrical converter (12), wherein the optimized pulse pattern (I) is determined from a first lookup table (30) and comprises discrete voltage amplitude values changing at predefined switching instants (24); determining a harmonic content reference (III) from the fundamental voltage reference (II) based on a second lookup table (34), wherein the harmonic content reference is a harmonic current reference (IV) determined from the frequency spectrum of a current of the electrical converter (12) or the harmonic content reference is a filtered voltage reference (V) determined by applying a first order frequency filter to a voltage, which current or voltage is generated, when the optimized pulse pattern is applied to the electrical converter (12); determining a harmonic content error (VI) from the harmonic content reference (III) by subtracting an estimated output voltage ( ψ(t) ) and/or estimated output current ( i(t) ) of the electrical converter (12) from the harmonic content reference (III); modifying the optimized pulse pattern (I) by timeshifting switching instants (24) such that the fundamental voltage reference (II) is tracked and the harmonic content error (VI) is corrected by the timeshifted switching instants (24); applying the modified optimized pulse pattern ( v(t) ) to semiconductor switches of the electrical converter (12).

    Abstract translation: 一种用于操作电转换器(12)的方法包括:从用于电转换器(12)的基本电压参考(II)确定优化的脉冲模式(I),其中优化的脉冲模式(I)从第一查找 (30)并且包括在预定义的切换时刻(24)改变的离散电压幅度值; 基于第二查找表(34)从基本电压基准(II)确定谐波含量参考(III),其中谐波含量参考是从电流的电流的频谱确定的谐波电流参考(IV) 转换器(12)或谐波含量基准是当优化的脉冲模式被施加到电转换器(12)时通过将一阶频率滤波器应用于产生该电流或电压的电压而确定的滤波电压基准(V) ; 通过从电谐波中减去电转换器(12)的估计输出电压(ψ(t))和/或估计的输出电流(i(t)),从谐波内容参照(III)中确定谐波含量误差(VI) 内容参考(III); 通过对切换时刻(24)进行时间移位来修正优化的脉冲模式(I),从而跟踪基本电压基准(II),并通过时移开关瞬间(24)校正谐波含量误差(VI)。 将修改的优化脉冲模式(v(t))应用于电转换器(12)的半导体开关。

    HYBRID CONTROL METHOD FOR AN ELECTRICAL CONVERTER
    8.
    发明申请
    HYBRID CONTROL METHOD FOR AN ELECTRICAL CONVERTER 审中-公开
    电动转换器的混合控制方法

    公开(公告)号:WO2016177535A1

    公开(公告)日:2016-11-10

    申请号:PCT/EP2016/057739

    申请日:2016-04-08

    Applicant: ABB SCHWEIZ AG

    Abstract: An electrical converter (12) comprises at least one of an active rectifier (20) and an inverter (22) interconnecting an electrical source (16) with an electrical load (18). A method for controlling an electrical converter (12) comprises: receiving at least one estimated control variable (38), which is estimated from measurement values measured in the electrical converter (12); receiving at least one outer loop control variable (36) provided by an outer control loop, the at least one outer loop control variable providing a desired steady-state operation point of the electrical converter (12); determining a control region (56a, 56b) based on a control error, which is a difference between the at least one estimated control variable (38) and the at least one outer loop control variable (36), wherein the control region is defined by one or more intervals of one or more control variables; selecting control parameters based on the control region (56a, 56b), wherein, when the control error is in an inner control region (56a), first control parameters are selected, and, when the control error is outside the inner control region but inside an outer control region (56b), second control parameters are selected; switching, based on the control error, between two and more control methods, which differ in control parameters, by predicting at least one reference control value (40) based on a solution (50) of a physical model (44) of the electrical converter (12), which comprises the selected control parameters, the physical model (44) being based on differential equations modelling the at least one estimated control variable (38) and the solution (50) being based on a constraint minimizing a difference between the at least one estimated control variable (38) and the at least one outer loop control variable (36); and determining switching states (42) of the electrical converter (12) based on the reference control value (40).

    Abstract translation: 电转换器(12)包括将电源(16)与电负载(18)互连的有源整流器(20)和逆变器(22)中的至少一个。 一种用于控制电转换器(12)的方法包括:接收根据在电转换器(12)中测量的测量值估计的至少一个估计控制变量(38); 接收由外部控制环路提供的至少一个外部环路控制变量(36),所述至少一个外部环路控制变量提供所述电力转换器(12)的期望的稳态操作点; 基于作为所述至少一个估计控制变量(38)和所述至少一个外部环路控制变量(36)之间的差的控制误差来确定控制区域(56a,56b),其中所述控制区域由 一个或多个控制变量的一个或多个间隔; 基于控制区域(56a,56b)选择控制参数,其中当控制误差在内部控制区域(56a)中时,选择第一控制参数,并且当控制误差在内部控制区域外部但是在内部控制区域 外部控制区域(56b),选择第二控制参数; 通过基于电转换器的物理模型(44)的解(50)来预测至少一个参考控制值(40),基于控制误差,在控制参数不同的两个和更多个控制方法之间切换, (12),其包括所选择的控制参数,所述物理模型(44)基于对所述至少一个估计控制变量(38)和所述解(50)建模的微分方程,所述约束基于使所述至少一个估计控制变量 至少一个估计控制变量(38)和所述至少一个外环控制变量(36); 以及基于所述参考控制值(40)确定所述电转换器(12)的切换状态(42)。

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