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公开(公告)号：US10852336B2
公开(公告)日：2020-12-01
申请号：US16155161
申请日：2018-10-09
Applicant: ABB Schweiz AG
Inventor： Silvia Mastellone , Peter Al-Hokayem , Pietro Raboni
IPC: G01R27/16 , G06F30/20 , H02J3/38 , G01R19/165 , G01R31/42
Abstract: A method for islanding detection in an electrical power grid supplied by an electrical power source. The method includes measuring an output voltage (Vpcc) and a grid current (Ig) at an interconnection point of the power source with the power grid; estimating at least one grid parameter from the output voltage (Vpcc) and the grid current (Ig) based on optimizing a cost function, which minimizes a difference between the measured output voltage (Vpcc) and an estimated output voltage or a difference between the measured grid current (Ig) and an estimated grid current, which estimated output voltage or estimated output current is a function of the measured grid current (Ig) or the measured output voltage (Vpcc) and the least one estimated grid parameter; and detecting an islanding condition by detecting a jump and/or a deviation in the at least one estimated grid parameter.
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公开(公告)号：US20180054112A1
公开(公告)日：2018-02-22
申请号：US15687206
申请日：2017-08-25
Applicant: ABB Schweiz AG
Inventor： Peter Al-Hokayem , Ivan Pejcic
CPC classification number: H02M1/126 , H02M1/12 , H02M7/48 , H02M2001/0012 , H02M2007/53876 , H02P21/14 , H02P23/14
Abstract: A method for controlling an electrical controller system (10), the method comprising, determining a reference output (ω*m) and an estimated output (ωm) of the electrical converter system (10) based on measurements in the electrical converter system (10); determining an optimized pulse pattern (uin by selecting from a table of precalculated optimized pulse patterns, which is chosen based on the reference output (ω*m) and the estimated output (ωm), a pulse pattern comprising a sequence of switching instants (ƒ) applied to the electrical converter system (10); determining a resonant oscillation (ψ0,h) in the electrical converter system (10), whereby the resonant oscillation (ψ0*) is composed of an electrical machine (16) and a LC fiber (14) of the electrical converter system (10); determining a sequence of future states of the electrical converter system (10) by solving a mathematical model of the electrical converter system (10) subject to optimizing a cost function and subject to a constraint that a modified pulse pattern (ui) is applied to the electrical converter system (10), which modified pulse pattern (ui) comprises time shifted switching instants with respect to the optimized pulse pattern (ui,n), wherein the cost function comprises a term compensating the resonant oscillation (ψo,h) with a pulse response oscillation caused by the time shifted switching instants of the modified pulse pattern (ui) and wherein the mathematical model is constrained such that the switching instants of the modified pulse pattern (ui) have the same order as the switching instants of the optimized pulse pattern (ui,n), applying the modified pulse pattern (ui) to the electrical converter system (10).
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13.发明授权公开(公告)号：US11689135B2
公开(公告)日：2023-06-27
申请号：US17616462
申请日：2019-06-06
Applicant: ABB Schweiz AG
Inventor： Matthias Rungger , Peter Al-Hokayem , Fabian Streiff , Valerijs Knazkins
IPC: H02P23/14 , H02P25/022
CPC classification number: H02P23/14 , H02P25/022
Abstract: A synchronous machine includes a stator with stator windings connected with stator terminals to an electrical grid and a rotor with rotor windings rotatable mounted in the stator, wherein a voltage regulator of the synchronous machine is adapted for outputting an excitation signal to adjust a current in the rotor windings for controlling the synchronous machine. A method for determining control parameters for the voltage regulator includes (i) receiving a first time series of values of the excitation signal and a second time series of measurement values of the terminal voltage in the stator terminals, (ii) determining coefficients of a system transfer function of the synchronous machine, and (iii) determining the control parameters for the voltage regulator from the coefficients of the system transfer function.
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Patent Agency Ranking
公开(公告)号：US10516328B2
公开(公告)日：2019-12-24
申请号：US15877333
申请日：2018-01-22
Applicant: ABB Schweiz AG
Inventor： Vedrana Spudic , Eduardo Rohr , Tobias Geyer , Peter Al-Hokayem
Abstract: A method for controlling a three-phase electrical converter comprises: selecting a three-phase optimized pulse pattern from a table of pre-computed optimized pulse patterns based on a reference flux; determining a two-component optimal flux from the optimized pulse pattern and determine a one-component optimal third variable; determining a two-component flux error from a difference of the optimal flux and an estimated flux estimated based on measurements in the electrical converter; determining a one-component third variable error from a difference of the optimal third variable and an estimated third variable; modifying the optimized pulse pattern by time-shifting switching instants of the optimized pulse pattern 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 to the electrical converter.
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公开(公告)号：US10466281B2
公开(公告)日：2019-11-05
申请号：US15982469
申请日：2018-05-17
Applicant: ABB Schweiz AG
Inventor： Peter Al-Hokayem
Abstract: A method for estimating a fundamental component of an AC voltage includes receiving a timely varying measurement signal of the AC voltage; parametrizing a fundamental component of the AC voltage; and determining parameters of the fundamental component based on minimizing a cost function. The fundamental component has a rated frequency, a variable amplitude and a variable phase shift. The cost function is based on an integral of a norm of a difference between the measurement signal and the parametrized fundamental component via a time horizon. The time horizon starts at an actual time point and goes back via a predefined length. The cost function includes 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, where the previously estimated fundamental component has been determined for a previous time point.
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公开(公告)号：US10312793B2
公开(公告)日：2019-06-04
申请号：US15865426
申请日：2018-01-09
Applicant: ABB Schweiz AG
Inventor： Eduardo Rohr , Peter Al-Hokayem , Tobias Geyer
IPC: H02M7/217 , H02M1/12 , H02M7/5387 , H02M1/00
Abstract: A method for operating an electrical converter including: determining an optimized pulse pattern from a fundamental voltage reference for the electrical converter, wherein the optimized pulse pattern is determined from a first lookup table and includes discrete voltage amplitude values changing at predefined switching instants; determining a harmonic content reference from the fundamental voltage reference based on a second lookup table, wherein the harmonic content reference is a harmonic current reference determined from the frequency spectrum of a current of the electrical converter or the harmonic content reference is a filtered voltage reference 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; determining a harmonic content error from the harmonic content reference by subtracting an estimated output voltage and/or estimated output current of the electrical converter from the harmonic content reference; modifying the optimized pulse pattern by timeshifting switching instants such that the fundamental voltage reference is tracked and the harmonic content error is corrected by the timeshifted switching instants; applying the modified optimized pulse pattern to semiconductor switches of the electrical converter.
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公开(公告)号：US20190049497A1
公开(公告)日：2019-02-14
申请号：US16155161
申请日：2018-10-09
Applicant: ABB Schweiz AG
Inventor： Silvia Mastellone , Peter Al-Hokayem , Pietro Raboni
IPC: G01R27/16 , H02J3/38 , G06F17/50 , G01R19/165 , G01R31/42
Abstract: A method for islanding detection in an electrical power grid supplied by an electrical power source. The method includes measuring an output voltage (Vpcc) and a grid current (Ig) at an interconnection point of the power source with the power grid; estimating at least one grid parameter from the output voltage (Vpcc) and the grid current (Ig) based on optimizing a cost function, which minimizes a difference between the measured output voltage (Vpcc) and an estimated output voltage or a difference between the measured grid current (Ig) and an estimated grid current, which estimated output voltage or estimated output current is a function of the measured grid current (Ig) or the measured output voltage (Vpcc) and the least one estimated grid parameter; and detecting an islanding condition by detecting a jump and/or a deviation in the at least one estimated grid parameter.
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公开(公告)号：US09831760B2
公开(公告)日：2017-11-28
申请号：US15097209
申请日：2016-04-12
Applicant: ABB Schweiz AG
Inventor： Peter Al-Hokayem , Tobias Geyer , Nikolaos Oikonomou
CPC classification number: H02M1/126 , G05B2219/41406 , H02M7/53873 , H02M7/53875 , H02M2001/0003 , H02P21/141 , H02P21/30 , H02P23/14 , H02P23/30
Abstract: An electrical converter is interconnected via a filter with an electrical load or an electrical power source. A method for controlling the converter comprises the steps of: receiving a reference flux (ψ*i) for the electrical converter; determining output signals (y) comprising currents and/or voltages measured in the filter; determining an estimated flux (ψi) from the output signals (y); determining a corrective flux (ψi,damp) from the output signals (y) based on a mathematical model of the filter and a quadratic cost function; determining control input signals (u) for the electrical converter based on a sum of the estimated flux (ψi) and the corrective flux (ψi,damp); controlling the converter with the control input signals (u); and algorithmic filtering of at least one of the output signals (y) by applying a signal filter to the at least one output signal, which is designed for amplifying the at least one output signal at a resonance frequency of the filter, whereby the corrective flux (ψi,damp) is determined from the filtered output signals.
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