Control and protection of a doubly-fed induction generator system

A doubly-fed induction and generator technology, applied in the direction of generator control circuit, AC motor control, electronic commutation motor control, etc., can solve the problem of no active switch in the preferred solution

Active Publication Date: 2006-08-23
GAMESA INNOVATION & TECH SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0049] The object of the invention is to provide a solution for protecting the converter in the event of a short circuit in the grid without disconnecting the stator from the grid, which does not require any oversized freewheeling diodes and which is preferred without active switches

Method used

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  • Control and protection of a doubly-fed induction generator system
  • Control and protection of a doubly-fed induction generator system
  • Control and protection of a doubly-fed induction generator system

Examples

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Embodiment Construction

[0091] Figure 5 with Image 6 Two preferred embodiments of the invention are shown. Most of the components shown correspond exactly to the reference figure 1 Those elements of the prior art system described; these elements bear the same reference numerals and need not be described otherwise. However, instead of figure 2 the converter 7, Figure 5 with 6 A converter comprising the same basic elements is shown, the two differ in that:

[0092] exist Figure 5 In the illustrated converter 170, the crowbar circuit has been replaced by a clamping unit 190, the converter comprising a control module 180 adapted to control said clamping unit (otherwise, the control module 180 is figure 1 The control module 80 of the system operates like that);

[0093] and

[0094] exist Image 6 In the shown converter 171, the clamping unit 190 has been combined and connected in parallel with the arc crowbar circuit 90, and the converter includes a control module 181 suitable for controll...

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Abstract

A control system for a double-fed induction generator (DFIG) comprising a rotor (1) having rotor windings and a stator (2) having stator windings connectable to a grid for electric power distribution. The control system comprises a converter (170, 171), having a clamping unit comprising at least one passive voltage-dependent resistor element (291, 292, 293, 294) for providing a clamping voltage over the rotor windings when the clamping unit is triggered. The invention also relates to a double-fed induction generator (DFIG) system and to a method for protecting the converter in a power generation system.

Description

technical field [0001] The present invention relates to the control of doubly-fed induction generators (DFIG), in particular doubly-fed induction generators used in wind power generation. Background technique [0002] A fundamental issue in using wind power to generate electrical energy is that the turbine speed should be variable with wind speed in order to increase energy efficiency and reduce the mechanical load on the wind turbine. However, regardless of changes in turbine speed, the output power of the wind generator should be maintained at a constant frequency, which corresponds to the frequency of the distribution system or grid to which the generator is connected. That is, variable speed constant frequency (VSCF) is required. In wind power generation, to achieve VSCF operation, doubly-fed induction generators (DFIGs) have been used; systems including DFIGs are disclosed in several documents, for example: [0003] "Vector Control of Variable Speed ​​Doubly-Fed Induc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/00H02P27/05H02P6/00
CPCH02P2009/004H02P2101/15F03D9/002H02P9/007H02P6/005H02P9/102Y02E10/725F03D9/25F03D9/255Y02E10/72H02P9/00
Inventor 哈维尔·华纳雷纳萨拉居特何塞伊格纳西奥·略伦特冈萨雷斯
Owner GAMESA INNOVATION & TECH SA
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