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The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.

The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.

Patent No.:

US 10236810 B1

PDFFull Text
Date of Patent:
Mar. 19, 2019

Filed:

Jan. 06, 2016

Monitoring of a dc-link of a split wind-turbine-converter system

Applicant:

Vestas Wind Systems A/s, Aarhus N, DK;

Inventors:

Søren Andersen, Tilst, DK;

John Godsk Nielsen, Hornslet, DK;

Duy Duc Doan, Tilst, DK;

Assignee:

VESTAS WIND SYSTEMS A/S, Aarhus N, DK;

Attorney:

Patterson + Sheridan, LLP

Primary Examiner:

Pedro J Cuevas

Int. Cl.
CPC ...
F03D 7/02 (2006.01); H02J 3/36 (2006.01); H02P 9/00 (2006.01); F03D 7/04 (2006.01); F03D 9/25 (2016.01); H02J 3/38 (2006.01); H02K 7/18 (2006.01); G01R 27/16 (2006.01); G01R 31/34 (2006.01); G01R 31/42 (2006.01); H02M 5/458 (2006.01); G01R 31/40 (2014.01); H02P 101/15 (2016.01);
U.S. Cl.
CPC ...
H02P 9/006 (2013.01); F03D 7/0264 (2013.01); F03D 7/0284 (2013.01); F03D 7/04 (2013.01); F03D 9/255 (2017.02); G01R 27/16 (2013.01); G01R 31/343 (2013.01); G01R 31/42 (2013.01); H02J 3/36 (2013.01); H02J 3/386 (2013.01); H02K 7/1838 (2013.01); H02M 5/4585 (2013.01); G01R 31/40 (2013.01); H02P 2101/15 (2015.01); H02P 2201/03 (2013.01); Y02E 10/723 (2013.01); Y02E 10/763 (2013.01); Y02E 60/60 (2013.01);
Abstract

A method of monitoring a split wind-turbine-converter system with at least one generator-side converter and at least one grid-side converter arranged at distant locations, and a DC-link in the form of an elongated conductor arrangement with at least one positive and at least one negative conductor. The impedance of the DC-link conductor arrangement is determined by means of DC-voltage sensors. The voltages between the positive and the negative conductors are determined at the generator-side converter and at the grid-side converter, and the difference between the voltages is determined. The impedance of the DC-link conductor arrangement is determined by putting the determined voltage difference in relation to the DC current flowing through the DC-link conductor arrangement. If the impedance exceeds a given impedance threshold a fault state is recognized.

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