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Wind power generation system

A wind power generation system and wind turbine technology, which are applied in the directions of wind energy generation, wind turbines, and wind turbine combinations to achieve the effects of large phase-to-phase mutual inductance, reduction of harmonic components, and suppression of sudden increase in current.

Active Publication Date: 2021-06-29
ZHEJIANG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the design of fault-tolerant generator / converter topology faces multiple challenges, one of the main difficulties is to balance the performance of normal operation and fault-tolerant operation

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] This embodiment provides a wind power generation system, including a wind power generator and at least two power conversion circuits, each power conversion circuit has the same phase number, and the wind power generator is connected to each power conversion circuit. Wherein, the power conversion circuit is used to receive the electric energy output by the wind power generator, and perform frequency conversion and output. Among them, at least two power conversion circuits are redundant with each other. When one of the power conversion circuits or a coil connected to a certain phase of the power conversion circuit fails, the corresponding power conversion circuit can be cut off, and the remaining power conversion circuits can work normally and continue to operate. Output Power.

[0062] figure 1 It is a schematic diagram showing a circuit topology of a wind power generation system. like figure 1 The wind power generation system shown includes three power conversion cir...

Embodiment 2

[0082] On the basis of Embodiment 1, this embodiment also provides a wind power generation system, the difference from Embodiment 1 is: the number of power conversion circuits connected to the coils wound on different stator teeth belonging to the same stator tooth group same.

[0083] In an optional implementation manner, the coils wound at the same position on different stator teeth belonging to the same stator tooth group have the same connection relationship with each phase of the power conversion circuit.

[0084] In this embodiment, when the coils on different stator teeth in the same stator tooth group are connected in series, since the coils connected to the same power conversion circuit are at the same radial position, the coils in these stator tooth groups are not connected after being connected. There will be overlap, and the connection between the coils is shorter and the spatial distribution is more concise. In addition, when the coil adopts the end welding proce...

Embodiment 3

[0106] On the basis of Embodiment 1, this embodiment also provides a wind power generation system, the difference from Embodiment 1 is: the number of power conversion circuits connected to the coils wound on different stator teeth belonging to the same stator tooth group different.

[0107] In an optional implementation manner, at least two different numbers of coils are wound on the stator teeth belonging to the same stator tooth group.

[0108] In an optional implementation manner, the k coils belonging to the same stator tooth are respectively connected to the same phase of the k power conversion circuits, where k is an integer greater than or equal to 2.

[0109] In an optional embodiment, the number of coils wound on the stator teeth of at least two periods in one stator unit is repeated.

[0110] In an optional embodiment, in one stator unit, the coils wound at the same position on the first stator tooth are connected to the same power conversion circuit, wherein the fi...

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Abstract

The invention discloses a wind power generation system. The wind power generation system comprises a wind power generator and at least two power conversion circuits, wherein the wind power generator comprises at least one stator unit which is distributed along the circumference; each stator unit comprises at least one stator tooth group which is distributed along the circumference; each stator tooth group comprises at least one stator tooth which is distributed along the circumference; at least two coils are wound on each stator tooth; the phase number of each power conversion circuit is the same; the power conversion circuits are used for converting the frequency of electric energy output by the wind power generator; the coils wound on each stator tooth belonging to the same stator tooth group are connected with the same phase of different power conversion circuits; and the total number of the coils connected between different phases of the same power conversion circuit is consistent. According to the wind power generation system, motor vibration caused by unbalance, harmonic impact on a power grid, sharp increase of eddy-current loss and torque fluctuation can be avoided, the efficiency of the wind power generator during fault-tolerant operation is improved, and the risk of demagnetization of a permanent magnet under the condition of short circuit is reduced.

Description

technical field [0001] The invention relates to the technical field of wind power generation, in particular to a wind power generation system. Background technique [0002] Highly reliable and maintenance-friendly wind turbines are a persistent topic in the wind power industry. They are especially important for offshore wind power with harsh environments and poor accessibility. They can significantly reduce operation and maintenance costs while increasing power generation. According to statistical data, converter failure is one of the main failure causes of wind turbines, and the downtime caused by such failures accounts for a large proportion, which is a key factor restricting the availability of wind turbines. [0003] Redundancy and fault tolerance are two types of methods to improve the reliability of wind turbines. The number and time of downtime caused by converter failure can be effectively reduced by adding spare converters, but there are disadvantages such as incre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03D9/25H02J9/06H02K1/12H02K3/24H02K3/34H02K11/30
CPCF03D9/25H02K11/30H02J9/06H02K3/24H02K1/12H02K3/345Y02E10/76Y02E10/72Y02B10/70
Inventor 吴立建王文婷吕泽楷刘嘉明闻汇许移庆金孝龙
Owner ZHEJIANG UNIV
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