中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

31 records (took 0.03 seconds)

    11.
    发明专利
    未知

    公开(公告)号：DE60318408T2

    公开(公告)日：2009-01-29

    申请号：DE60318408

    申请日：2003-06-21

    Applicant: ABB RESEARCH LTD

    Inventor： KORBA PETR ,  LARSSON MATS ,  REHTANZ CHRISTIAN

    IPC: H02J3/24

    Abstract: The detection of electromechanical oscillations in power systems and the estimation of their parameters (frequency f and damping xi ) is based on a linear time-varying model. The parameters of the linear model are on-line adapted by means of Kalman filtering techniques to approximate the measured signal y (representing the behaviour of the power system) optimally in the sense of a quadratic criterion. The estimated model parameters are then the basis for the calculation of parameters of the oscillations. Adaptive algorithms are based on a recursive calculation of the estimated parameter vector for each time-step based on the new value of the measured signal and the old values of the estimated parameters. As opposed to the collection of data over a time window and then performing the parameter identification at once, any change in the system can thus be detected much faster.

    12.
    发明专利
    未知

    公开(公告)号：DE60318408D1

    公开(公告)日：2008-02-14

    申请号：DE60318408

    申请日：2003-06-21

    Applicant: ABB RESEARCH LTD

    Inventor： KORBA PETR ,  LARSSON MATS ,  REHTANZ CHRISTIAN

    IPC: H02J3/24

    Abstract: The detection of electromechanical oscillations in power systems and the estimation of their parameters (frequency f and damping xi ) is based on a linear time-varying model. The parameters of the linear model are on-line adapted by means of Kalman filtering techniques to approximate the measured signal y (representing the behaviour of the power system) optimally in the sense of a quadratic criterion. The estimated model parameters are then the basis for the calculation of parameters of the oscillations. Adaptive algorithms are based on a recursive calculation of the estimated parameter vector for each time-step based on the new value of the measured signal and the old values of the estimated parameters. As opposed to the collection of data over a time window and then performing the parameter identification at once, any change in the system can thus be detected much faster.

    13.
    发明专利
    未知

    公开(公告)号：BR0304489A

    公开(公告)日：2004-08-31

    申请号：BR0304489

    申请日：2003-10-14

    Applicant: ABB RESEARCH LTD

    Inventor： REHTANZ CHRISTIAN ,  WESTERMANN DIRK

    IPC: H02J3/00 ,  H02H7/26

    Abstract: Parameters of a ward equivalent circuit (6) representing a composite network section of both external and internal network section are determined. Behavior of the ward equivalent circuit connected to the power transmission section, is the analyzed. Independent claims are also included for the following: (1) electrical power transmission network simulating computer system; and (2) electrical power transmission network simulating computer program.

    15.
    发明专利
    未知

    公开(公告)号：AT478459T

    公开(公告)日：2010-09-15

    申请号：AT01113879

    申请日：2001-06-07

    Applicant: ABB RESEARCH LTD

    Inventor： REHTANZ CHRISTIAN ,  WESTERMANN DIRK ,  BOSSHART PETER

    IPC: H02J3/00 ,  H02J3/12

    Abstract: The method involves describing all possible configurations using a configuration model, determining a number of requirements for a configuration to be determined, systematically generating all possible configurations that satisfy these requirements, each having at least one associated parameter and automatically determining a solution configuration that optimizes a defined parameter. AN Independent claim is also included for the following: a computer program product for configuring part of electrical energy distribution network and a system for configuring part of electrical energy distribution network.

    17.
    发明专利
    未知

    公开(公告)号：NO20025984L

    公开(公告)日：2003-06-23

    申请号：NO20025984

    申请日：2002-12-12

    Applicant: ABB RESEARCH LTD

    Inventor： ZIMA MAREK ,  REHTANZ CHRISTIAN

    IPC: H02H3/40 ,  H02J13/00 ,  H02H6/00 ,  H02H7/22 ,  H02J3/00 ,  H02J3/24 ,  H02J

    Abstract: In a method, computer program and system for estimating a state of an electric power transmission network, time-stamped phasor measurements are made by phasor measurement units (1) located at a first set of locations (11,12) throughout the network, and a plurality of voltage and/or current phasors at a second set of locations is estimated, where the locations of the first (11,12) and second sets of locations are distant from one another, and a status of network elements (L4,L5,13) that are remotely located from the phasor measurement units is inferred from the phasor measurements and the estimated phasors. In a preferred variant of the invention, the network elements are transmission lines (L1...L8), switchgear, under load tap changing transformers, compensation devices (13) or FACTS devices, and the status information describes whether a network element (L4,L5,13) is electrically connected to or disconnected from the network.

    18.
    发明专利
    未知

    公开(公告)号：NO20025984D0

    公开(公告)日：2002-12-12

    申请号：NO20025984

    申请日：2002-12-12

    Applicant: ABB RESEARCH LTD

    Inventor： ZIMA MAREK ,  REHTANZ CHRISTIAN

    IPC: H02H3/40 ,  H02J13/00 ,  H02H6/00 ,  H02H7/22 ,  H02J3/00 ,  H02J3/24 ,  H02J

    Abstract: In a method, computer program and system for estimating a state of an electric power transmission network, time-stamped phasor measurements are made by phasor measurement units (1) located at a first set of locations (11,12) throughout the network, and a plurality of voltage and/or current phasors at a second set of locations is estimated, where the locations of the first (11,12) and second sets of locations are distant from one another, and a status of network elements (L4,L5,13) that are remotely located from the phasor measurement units is inferred from the phasor measurements and the estimated phasors. In a preferred variant of the invention, the network elements are transmission lines (L1...L8), switchgear, under load tap changing transformers, compensation devices (13) or FACTS devices, and the status information describes whether a network element (L4,L5,13) is electrically connected to or disconnected from the network.

Patent Agency Ranking