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Control system and method for the rotor side converter of a doubly-fed induction generator in a wind turbine

A technology of rotor-side converters and wind turbines, applied in generator control circuits, control systems, wind power generation, etc., can solve the problems of disconnection of power generation units and high transient currents, increase dynamics, reduce switching losses, Effect of reducing fault current

Pending Publication Date: 2021-12-21
SIEMENS GAMESA RENEWABLE ENERGY INNOVATION &TECH SL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] • Stator and rotor transient currents may be high enough to force the generator unit to disconnect;

Method used

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  • Control system and method for the rotor side converter of a doubly-fed induction generator in a wind turbine
  • Control system and method for the rotor side converter of a doubly-fed induction generator in a wind turbine

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Embodiment Construction

[0050] The following is a detailed description of the electrical system of the doubly-fed induction generator (1) of the wind turbine and the associated control method for the rotor-side converter (2) of the invention. The windings of the doubly-fed induction generator (1) are connected to the rotor three-phase bridge (2). The rotor-side converter shares its DC connection (4) with the three-phase grid bridge (3). The three-phase AC connection of the grid bridge (3) may include a three-phase power filter (5). Likewise, the AC three-phase connection of the rotor-side converter (2) may comprise a three-phase power filter (6). The AC three-phase connection of the grid bridge and the stator windings are connected to the low-voltage windings of the three-phase step-up transformer (7). Both the AC three-phase connection of the grid bridge and the stator windings can have contactors ( 8 ) and switches ( 9 ) in order to make electrical operation easier and guarantee protection. Both...

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Abstract

The present invention refers to a control method for the rotor side converter of a doubly-fed induction generator in a wind turbine for disturbances in the electric grid. It further refers to a control system (11) for the rotor side converter (2) of a doubly-fed induction generator (1) in a wind turbine characterized in that it comprises a calculating unit (202) configured for calculating at least one reference current (i*r). It further comprises a current controller (203) which is a hybrid controller configured to operate in two different modes, a first operating mode, preferably set during a transient of a disturbance in an electric grid, where the current controller (203) is configured to operate with a modulation index being outside a linear area and a second operating mode, preferably set during a stable state of the disturbance in the electric grid, where the current controller (203) is configured to operate with a modulation index inside the linear area, thereby instantly providing a maximum voltage (106) available in a rotor so as to satisfy the at least one reference current (i*r).

Description

technical field [0001] The object of the present invention is a control system and method for a rotor-side converter of a doubly-fed induction generator in a wind turbine against disturbances in the grid. Background technique [0002] For the rotor-side converter of a doubly-fed induction generator (DFIG) in a wind turbine, a wide variety of controllers exist, which can be grouped into classical vector control, dual vector control and direct control controllers. [0003] Vector Control (VC) is the most common technique and it requires a Pulse Width Modulator (PWM). Combination with the modulator provides constant switching frequency and low current harmonic content. This is described in the publication "R. Pena, J. C. Clare and G.M. Asher, "Doubly fed induction generator using back-to-back PWM converters and its application to variable-speed wind-energy generation," in IEEEProceedings-Electric Power Applications, vol. 143 , no. 3, pp. 231-241, May 1996" is known. Under no...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/00H02J3/38H02P101/15
CPCH02P9/007H02J3/381H02P2101/15H02J2300/28Y02E10/76
Inventor M·利佐莫伦特I·古德罗德里格斯M·巴尔尼斯埃斯帕拉德尔A·阿古多阿拉克
Owner SIEMENS GAMESA RENEWABLE ENERGY INNOVATION &TECH SL