A double-fed wind turbine generator set stator quasi-synchronization grid-connection voltage detection system

By replacing the high-voltage transformer with a three-phase low-voltage transformer on the grid side in a doubly-fed wind turbine, the problems of large space occupation and heavy maintenance workload of the three-phase high-voltage transformer are solved, safe and reliable high-voltage synchronous grid connection detection is achieved, and economic efficiency is improved.

CN116106615BActive Publication Date: 2026-07-24ДУНФАН ЭЛЕКТРИК ВИНД ПАУЭР КО ЛТД
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Patent Information

Application Number
CN202211724554.7
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2022-12-30
Publication Date
2026-07-24
Estimated Expiration
2042-12-30

AI Technical Summary

Technical Problem

In the existing doubly fed wind turbine generator set stator high voltage synchronization grid connection testing, the three-phase high voltage transformer occupies a large space, resulting in a large workload for operation and maintenance, and low reliability for safe production operation and maintenance.

Method used

A stator quasi-synchronous grid-connected voltage detection system for doubly fed wind turbines is adopted. Three-phase low-voltage transformers at other locations on the grid side are used as virtual substitutes to reduce the use of three-phase high-voltage transformers. High-voltage synchronous grid-connected detection is achieved through the connection of converters and transformers.

Benefits of technology

It saves space and maintenance workload for three-phase high-voltage transformers, improves the reliability of safe production operation, and enhances economic benefits.

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Abstract

The application discloses a kind of double-fed wind turbine stator quasi-synchronization grid-connected voltage detection systems, the system includes the blade and hub, gear box and double-fed asynchronous generator connected in turn;The rotor loop of double-fed asynchronous generator is connected to the low voltage side of three-coil transformer by converter machine side MPR, converter DC link and converter net measurement NPR;Using the cost of other positions of double-fed wind turbine grid side, smaller space occupied, higher safety and reliability of a set of three-phase low voltage mutual inductor as virtual replacement, it can fully meet double-fed wind turbine stator high-voltage synchronization single switching grid-connected or double switching grid-connected detection grid side function.The application saves two sets of three-phase high voltage mutual inductor and the larger space occupied by it;Reduce the workload of operation and maintenance, improve the reliability of safe production operation and maintenance, and improve the economic benefit of double-fed wind turbine.
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