Title:
POLE-SLIP PROTECTION SYSTEM AND METHOD FOR SYNCHRONOUS MACHINES
Document Type and Number:
WIPO Patent Application WO/2011/070520
Kind Code:
A3
Abstract:
A method of protecting a synchronous machine (10) connected to an electricity network (12) against pole-slip comprises the steps of continuously monitoring a power transfer angle (δ) between an electromotive force (EMF) of the machine and a reference voltage Vref. In the event of a fault (24) on the electricity network which may result in pole-slip of the machine (10), deriving a representation of power transfer (P) relating to the machine against the power transfer angle (δ) utilizing data relating to a value of a current or a voltage measured on a terminal (26) of the machine before the fault has occurred and computed data relating to an expected future value of a current or voltage on the terminal (26), after the fault has occurred. The method then utilizes the representation and a stability criterion to predict whether the machine (10) may become unstable and if instability is predicted, causes the machine (10) to be disconnected at 32 or 34 from the electricity network (12).
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Inventors:
DE KOCK JAN ABRAHAM (ZA)
LAMONT LAFRAS (AU)
LAMONT LAFRAS (AU)
Application Number:
PCT/IB2010/055663
Publication Date:
December 29, 2011
Filing Date:
December 08, 2010
Export Citation:
Assignee:
UNIV NORTHWEST (ZA)
DE KOCK JAN ABRAHAM (ZA)
LAMONT LAFRAS (AU)
DE KOCK JAN ABRAHAM (ZA)
LAMONT LAFRAS (AU)
International Classes:
H02P9/00; H02P9/30; H02P9/10; H02P25/02; H02P29/02
Other References:
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DANKU M A ET AL: "Fast prediction of the power-swing curve across transmission lines during wide area disturbances", POWER SYSTEMS CONFERENCE, 2009. PSC '09, IEEE, PISCATAWAY, NJ, USA, 10 March 2009 (2009-03-10), pages 1 - 5, XP031531784, ISBN: 978-1-4244-5248-4
CENTENO V ET AL: "Adaptive out-of-step relay with phasor measurement", DEVELOPMENTS IN POWER SYSTEM PROTECTION, SIXTH INTERNATIONAL CONFERENC E ON (CONF. PUBL. NO. 434) NOTTINGHAM, UK 25-27 MARCH 1997, LONDON, UK,IEE, UK, 25 March 1997 (1997-03-25), pages 210 - 213, XP006507970, ISBN: 978-0-85296-672-3, DOI: 10.1049/CP:19970065
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DANKU M A ET AL: "Fast prediction of the power-swing curve across transmission lines during wide area disturbances", POWER SYSTEMS CONFERENCE, 2009. PSC '09, IEEE, PISCATAWAY, NJ, USA, 10 March 2009 (2009-03-10), pages 1 - 5, XP031531784, ISBN: 978-1-4244-5248-4
CENTENO V ET AL: "Adaptive out-of-step relay with phasor measurement", DEVELOPMENTS IN POWER SYSTEM PROTECTION, SIXTH INTERNATIONAL CONFERENC E ON (CONF. PUBL. NO. 434) NOTTINGHAM, UK 25-27 MARCH 1997, LONDON, UK,IEE, UK, 25 March 1997 (1997-03-25), pages 210 - 213, XP006507970, ISBN: 978-0-85296-672-3, DOI: 10.1049/CP:19970065
SANAYE-PASAND M ED - INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS: "Study, comparison and simulation of power system swing detection and prediction methods", 2003 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING. CONFERENCE PROCEEDINGS. TORONTO, ONTARIO, CANADA, JULY, 13 - 17, 2003; [IEEE POWER ENGINEERING SOCIETY], NEW YORK, NY : IEEE, US, vol. 1, 13 July 2003 (2003-07-13), pages 27 - 32, XP010687218, ISBN: 978-0-7803-7989-3, DOI: 10.1109/PES.2003.1267122
BI DAQIANG ET AL: "The out-of-step protection with prediction function for generators", ELECTRICAL MACHINES AND SYSTEMS, 2001. ICEMS 2001. PROCEEDINGS OF THE FIFTH INTERNATIONAL CONFERENCE ON AUGUST 18-20, 2001, PISCATAWAY, NJ, USA,IEEE, vol. 1, 18 August 2001 (2001-08-18), pages 127 - 130, XP010568354, ISBN: 978-7-5062-5115-0
Attorney, Agent or Firm:
DM KISCH INC. (2146 Sandton, ZA)
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