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Topology of HVDC Converter for Doubly-fed Wind Turbine

A technology of wind power generators and wind power generators, applied in the field of converters and high-voltage DC converters, can solve the problems of high cost, large footprint, and high loss, and achieve low cost, small footprint, and low loss Effect

Active Publication Date: 2017-11-14
QUFU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantages are: step-up transformers and box-type substations are required, which require a large area, high cost, and high loss, which especially restricts the development of offshore wind power.

Method used

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  • Topology of HVDC Converter for Doubly-fed Wind Turbine

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Experimental program
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Embodiment Construction

[0011] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0012] As shown in the drawings, the converter topology of the megawatt-scale wind power generating set of the present invention includes a rectifier 1 , a machine-side converter 2 , and a grid-side DC-DC boost converter 3 . After the AC power output by the stator 4 of the doubly-fed wind turbine is rectified by the rectifier 1, one end is connected to the machine-side converter 2; to the high-voltage direct current grid 6 to realize controllable direct current grid connection. One end of the machine-side converter 2 is connected to the rotor 5 of the doubly-fed wind power generator to provide excitation current for the rotor 5 of the doubly-fed wind power generator. The other end of the machine-side converter 2 is connected to the DC-DC boost converter 3 , which can transfer the active power generated by the rotor 5 to the high-voltage direct current grid t...

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Abstract

The invention discloses a topological structure of a high-voltage direct-current transformer for a double-fed wind generating set, and belongs to the technical field of wind power technology. The topological structure comprises a rectifier, a generator-side current transformer and a network-side DC-DC (direct current) voltage-boosting converter. One end of the rectifier is connected with a stator of a double-fed wind generator, and the other end of the rectifier is respectively connected with the generator-side current transformer and the network-side DC-DC voltage-boosting converter. The other end of the generator-side current transformer is connected with a rotor of the double-fed wind generator. The other end of the network-side DC-DC voltage-boosting converter is connected with a high-voltage direct-current bus through a high-voltage direct-current cable to realize grid-connected power generation of the wind generator.

Description

technical field [0001] The invention relates to a converter, in particular to a high-voltage DC converter used in a doubly-fed wind power generating set, and belongs to the technical field of wind power generation. Background technique [0002] At present, megawatt-level wind turbines generally output 690V50Hz AC power through AC-DC-AC converters, and after being boosted by a step-up transformer installed in a box-type substation, they are connected to the AC busbar and connected to the grid. Its disadvantages are: step-up transformers and box-type substations are required, which require a large area, high costs, and high losses, which especially restrict the development of offshore wind power. Contents of the invention [0003] The main purpose of the present invention is to solve the above-mentioned problems and propose a converter topology structure of a megawatt-level wind power generating set that does not require a step-up transformer or a box-type substation. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
CPCY02E10/76
Inventor 蔡彬闫绍敏李金鹏高媛
Owner QUFU NORMAL UNIV