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Topological structure of high-voltage direct-current transformer for double-fed wind generator set

A technology for wind turbines and wind turbines is applied in the field of converters and high-voltage DC converters, which can solve the problems of high cost, high loss, and large floor space, and achieve low cost, small loss, and floor space. small effect

Active Publication Date: 2013-08-07
QUFU NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Topological structure of high-voltage direct-current transformer for double-fed wind generator set

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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 a DC-DC boost converter 3 , which can transmit the active power generated by the rotor 5 to the high-voltage direct current grid thr...

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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 problems and propose a converter topology for megawatt-level wind power generators that does not require step-up transformers or box-type substations. [0004] The topology of the con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCY02E10/763Y02E10/76
Inventor 蔡彬闫绍敏李金鹏高媛
Owner QUFU NORMAL UNIV