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公开(公告)号：AU2002368205A1
公开(公告)日：2004-04-30
申请号：AU2002368205
申请日：2002-09-13
Applicant: ABB AB
Inventor： BENGTSSON CLAES , ANGQUIST LENNART , HALVARSSON PER , VALDEMARSSON STEFAN , LILJESTRAND LARS
Abstract: An electric network for generation and transmission of electric power, including a power generating part, a point of common connection for the power generating part, a transmission link, a load network, and a reactive power compensator. The transmission link is coupled between the point of common connection and a grid connection point at the load network. The reactive power compensator is coupled to transmission link. The power generating part includes at least one wind turbine with an electric generator of induction type, coupled to the point of common connection. The reactive power compensator includes a capacitor bank and in parallel coupling to the capacitor bank a controllable inductor having a magnetic core, a main winding for alternating current, and a DC-control winding for direct current. The DC-control winding for control of the magnetic flux is set up by the main winding via orthogonal magnetization of the core.
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Patent Agency Ranking
公开(公告)号：CA2323869C
公开(公告)日：2008-12-23
申请号：CA2323869
申请日：2000-03-20
Applicant: ABB AB
Inventor： ANGQUIST LENNART
Abstract: An electric transmission line, included in a power system, transmits a power (p(t)). In a method for damp-ing of power oscillations (.DELTA.p(t)) in the transmission line, at least one first angular-frequency signal (.OMEGA., .OMEGA.1) is generated, representing a first angular frequency (.OMEGA., .OMEGA.1) which is given by a priori knowledge of oscillation fre-quencies expected in the power sys-tem , and a first phase-reference sig-nal (.theta.(t), .theta., (t)) is formed as the time integral of said angular-frequency sig-nal. A power quantity (p(t, i(t))) in the transmission line, which is characterizing for the power (p(t)), is sensed and a first estimated power quan-tity (.DELTA.~, .DELTA.~1) is formed, represent-ing , for an oscillation of said first angular frequency, its amplitude and phase position relative to said first phase-reference signal. A first damp-ing signal (D(t), D)1(t)) is formed with an amplitude in dependence on the amplitude of said first estimated power quantity and with an eligible first phase shift (90.degree. + .alpha., 90.degree. + .alpha.1) in relation to the phase position thereof, and said first damping signal is sup-plied to an actuator for influencing the power transmitted in the transmission lin e.
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公开(公告)号：CA2323869A1
公开(公告)日：2000-09-28
申请号：CA2323869
申请日：2000-03-20
Applicant: ABB AB
Inventor： ANGQUIST LENNART
Abstract: An electric transmission line, included in a power system, transmits a power(p(t)). In a method for damping of power oscillations (.DELTA.p(t)) in the transmission line, at least one first angular-frequency signal (.OMEGA., .OMEGA.1) is generated, representing a first angular frequency (.OMEGA., .OMEGA.1) which is given by a priori knowledge of oscillation frequencies expected in the power system, and a first phase-reference signal (.theta.(t), .theta., (t)) is formed as the time integral of said angular-frequency signal. A power quantity (p(t, i(t))) in the transmission line, which is characterizing for the power (p(t)), is sensed and a first estimated power quantity (.DELTA. P , .DELTA. P 1) is formed, representing, for an oscillation of said first angular frequency, its amplitude and phase position relative to said first phase-reference signal. A first damping signal (D(t),D)1(t)) is formed with an amplitude in dependence on the amplitude of said first estimated power quantity and with an eligible first phase shift (90~ + .alpha., 90~ + .alpha.1) in relation to the phase position thereof, and said first damping signal is supplied to an actuator for influencing the power transmitted in the transmission line.
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公开(公告)号：AU4156300A
公开(公告)日：2000-10-09
申请号：AU4156300
申请日：2000-03-20
Applicant: ABB AB
Inventor： ANGQUIST LENNART
Abstract: In a method for damping power oscillations in a transmission line, at least one first angular-frequency signal is generated, representing a first angular frequency which is given by a prior knowledge of oscillation frequencies expected in the power system, and a first phase-reference signal is formed as the time integral of the angular-frequency signal. A power quantity in the transmission line characterizing the power is sensed and a first estimated power quantity is formed, representing for an oscillation of the first angular frequency, its amplitude and phase position relative to the first phase-reference signal. A first damping signal is formed with an amplitude dependent on the amplitude of the first estimated power quantity and with a first phase shift in relation to the phase position thereof, and the first damping signal is supplied to an actuator for influencing the power transmitted in the transmission line.
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公开(公告)号：ES2147785T3
公开(公告)日：2000-10-01
申请号：ES94910071
申请日：1994-01-31
Applicant: ABB AB
Inventor： PAULSSON LARS , ANGQUIST LENNART
Abstract: PCT No. PCT/SE94/00072 Sec. 371 Date Oct. 24, 1994 Sec. 102(e) Date Oct. 24, 1994 PCT Filed Jan. 31, 1994 PCT Pub. No. WO94/22279 PCT Pub. Date Sep. 29, 1994An arc furnace (1) has an electrode (13) and connection members (14) for connection to a power-supply network (20) for supplying an arc (16) at the electrode with current. The furnace is provided with a voltage-pulse generating member (3) adapted, in connection with an interruption in the arc, to supply voltage pulses to the furnace for striking the arc.
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公开(公告)号：AU1529002A
公开(公告)日：2002-06-11
申请号：AU1529002
申请日：2001-11-20
Applicant: ABB AB
Inventor： ANGQUIST LENNART , THORVALDSSON BJORN
IPC: H02J3/18
Abstract: A device for control of a compensator connected to a polyphase electric transmission network for reactive electric power in dependence on a voltage sensed in the transmission network. A voltage controller, in dependence on the difference of a reference value for the voltage and its sensed value, forms a reference value for a reactive power flow through the compensator. A transformation element represents the sensed voltage as a voltage vector in a rotating two-phase system of coordinates and forms a compensation signal in dependence on a sensed change of the angular position of the voltage vector in the two-phase system of coordinates. A summation element forms the reference value for reactive power flow through the compensator in dependence on the compensation signal.
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