A grid-connected doubly-fed induction generator stator current control method and device

A generator stator, double-fed induction technology, applied in the direction of motor generator control, generator control circuit, control electromechanical transmission, etc., can solve broadband harmonic current injection, converter switching frequency uncertainty, filter inductor design Difficulties and other problems, to achieve the effect of eliminating coordinate transformation, simplifying the implementation process, and enhancing robustness
CN106982021BActive Publication Date: 2021-11-19CHINA ELECTRIC POWER RES INST +3
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA ELECTRIC POWER RES INST
Publication Date
2021-11-19

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Abstract

The invention provides a method and device for controlling the stator current of a grid-connected doubly-fed induction generator. The method includes: performing coordinate transformation on the collected parameters of the doubly-fed induction generator to obtain The stator voltage vector U sαβ and the stator current vector I sαβ ; Calculate the stator current vector I of the doubly-fed induction generator sαβ α, β axis command; according to the DFIG stator current α, β axis command and the actual measured feedback value, calculate the rotor voltage command U' under the stator two-phase stationary coordinate system rαβ ;To the rotor voltage command U' rαβ Carry out coordinate transformation to obtain the rotor voltage command U in the rotor two-phase static α-β coordinate system rαβ ;According to the rotor voltage command U rαβ A set of PWM signals are obtained to control the rotor converter of the doubly-fed induction generator. The technical scheme provided by the invention simplifies the design and implementation process of the control system, and enhances the adaptability of the control system to generator parameter changes.
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Description

technical field

[0001] The invention relates to a doubly-fed induction wind power generator control method and device, in particular to a grid-connected doubly-fed induction generator stator current control method and device. Background technique

[0002] Due to the advantages of small converter capacity and variable speed and constant frequency operation of DFIG, DFIG has become the mainstream type of wind turbine, accounting for 70-80% of the installed capacity, and is also the current wind power technology field. The main research object, especially the research on the operation and control of doubly-fed induction generator.

[0003] The control of double-fed induction generator is mainly divided into two categories: vector control and direct power control. In vector control, the stator voltage phase angle (or stator flux phase angle) is obtained as the coordinate transformation angle of the synchronous rotating coordinate system through a phase-locked loop, and then a p...

Claims

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