METHOD AND DEVICE FOR DETECTING SHORT-CIRCUIT CAPACITY OF GRID-CONNECTED POINT OF WIND GENERATING SET

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(11)

EP 3 570 050 A8

(12)	CORRECTED EUROPEAN PATENT APPLICATION
	published in accordance with Art. 153(4) EPC

(15)	Correction information:
	Corrected version no 1 (W1 A1)

(48)	Corrigendum issued on:
	15.01.2020 Bulletin 2020/03

(43)	Date of publication:
	20.11.2019 Bulletin 2019/47

(21)	Application number: 18882270.4

(22)	Date of filing: 13.07.2018

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International Patent Classification (IPC):

G01R 31/00^(2006.01)

(86)	International application number:
	PCT/CN2018/095647

(87)	International publication number:
	WO 2019/178987 (26.09.2019 Gazette 2019/39)

(84)	Designated Contracting States:
	AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
	Designated Extension States:
	BA ME
	Designated Validation States:
	KH MA MD TN

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Priority:

21.03.2018 CN 201810236958

(71)	Applicant: Beijing Goldwind Science & Creation Windpower Equipment Co., Ltd.
	Beijing 100176 (CN)

(72)	Inventor:
	GAO, Rui Beijing 100176 (CN)

(74)	Representative: Gulde & Partner
	Patent- und Rechtsanwaltskanzlei mbB Wallstraße 58/59 10179 Berlin 10179 Berlin (DE)

(54)	METHOD AND DEVICE FOR DETECTING SHORT-CIRCUIT CAPACITY OF GRID-CONNECTED POINT OF WIND GENERATING SET

(57) The present disclosure discloses a method and apparatus for detecting a short-circuit capacity at a grid connection point of a wind turbine. The method includes: modulating, when a converter is in a grid-side no-load modulation state and a power grid is in a short-circuited state with respect to the converter, a reactive power reference value and a braking power reference value of the converter; collecting a modulated three-phase voltage signal and a modulated three-phase current signal at the grid connection point of the wind turbine; and obtaining, according to the modulated three-phase voltage signal and the modulated three-phase current signal at the grid connection point of the wind turbine as well as a rated line voltage at the grid connection point of the wind turbine, the short-circuit capacity at the grid connection point of the wind turbine. With the technical solutions in embodiments of the present application, it is possible to implement effective detection of a short-circuit capacity at a grid connection point of a wind turbine.