Method and device for calculating short-circuit current in whole low-voltage ride through process of doubly-fed fan

A low-voltage ride-through, doubly-fed wind turbine technology, applied in computing, computer-aided design, electrical digital data processing, etc., can solve problems such as insufficient power grid setting value accuracy, eliminate potential risks, have good matching, and improve accuracy. and efficiency effects
CN112232009AActive Publication Date: 2021-01-15CHINA ELECTRIC POWER RES INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA ELECTRIC POWER RES INST
Publication Date
2021-01-15

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Abstract

The invention discloses a method and a device for calculating short-circuit current in the whole low-voltage ride through process of a doubly-fed fan. The method comprises the following steps: determining a short-circuit current output to a power grid by a doubly-fed fan when the power grid has a short-circuit fault and the doubly-fed fan is in a Crowbar input stage; determining short-circuit current output to the power grid by the doubly-fed fan when the power grid has a short-circuit fault and the doubly-fed fan is in an RSC reactive power control stage; and determining the maximum short-circuit current and the minimum short-circuit current output to the power grid by the doubly-fed fan in the whole low-voltage ride-through process when the power grid has a short-circuit fault, wherein the maximum short-circuit current and the minimum short-circuit current are used for determining setting of related protection constant values in the power grid to which the doubly-fed fan is connected. The method comprehensively and completely considers the whole low-voltage ride-through process of the doubly-fed induction generator when the power grid is short-circuited, the calculated short-circuit current value is accurate and reliable, and the method is well matched with the actual operation process of the doubly-fed induction generator.
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Description

technical field

[0001] The invention belongs to the technical field of relay protection setting calculation, and in particular relates to a short-circuit current calculation method and device in the whole process of low-voltage ride-through of a double-fed fan. Background technique

[0002] my country's wind energy resources are mainly distributed in the "Three Norths" and the southeast coastal areas, far away from the load center. At present, wind power generation has changed from small-scale and decentralized access in the early stage of development to cluster development and centralized grid connection. As a large number of wind farms are connected to the grid in the form of clusters, the impact of large-scale wind power access on the power system cannot be ignored.

[0003] Field operation data show that in some areas where wind farm clusters are connected, when a short-circuit fault occurs in the power grid, the wind farm side provides a large short-circuit current to ...

Claims

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