Method for restraining imbalance and deformation of double-feedback type wind generator set stator current

A technology for wind turbines and stator currents, applied in the direction of controlling generators, wind power generation, electrical components, etc., to achieve the effects of improving operating efficiency, optimizing control performance, and prolonging service life

Active Publication Date: 2008-09-24
NARI TECH CO LTD +1
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  • Claims
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AI Technical Summary

Problems solved by technology

[0018] The technical problem to be solved by the present invention is to propose a method for suppressing the doubly-fed wind power generation system for the existing control technology of the doubly-fed wind

Method used

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  • Method for restraining imbalance and deformation of double-feedback type wind generator set stator current
  • Method for restraining imbalance and deformation of double-feedback type wind generator set stator current
  • Method for restraining imbalance and deformation of double-feedback type wind generator set stator current

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Embodiment Construction

[0038] The present invention will be further described in detail below with reference to the accompanying drawings and examples. However, the invention is not limited to the examples given.

[0039] Such as Figure 5 It is a flow chart of the method for suppressing the unbalance and distortion of the stator current of the doubly-fed wind power generating set according to the present invention. The method is realized by the software in the computing chip, and its functional modules mainly include an active and reactive power calculation module, a power adjustment module, Coordinate transformation module, rotor current regulation module, stator voltage and current fundamental wave positive sequence component detection module, rotor current control variable calculation module, the steps are as follows:

[0040] (1) Read the given power command in the main control of the unit, the given power command includes the given active power P * , given reactive power Q * ;

[0041] (2)...

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Abstract

The invention relates to a method for restraining the current imbalance and aberrance of a stator of a double-feed wind generating set. The voltage of the stator as well as the positive sequence component and the non-positive sequence component of a fundamental wave of the current are obtained by detection and calculation; by comparing and adjusting the active power and the reactive power which are calculated by the specified values of a master active power and a master reactive power, the voltage at the stator side and the positive sequence component and transformation of coordinate, the specified value of the positive sequence current of a rotor in a static coordinate system is obtained; the specified value of the control quantity of a rotor three-phase current restraining the current imbalance and aberrance of the stator is obtained by the non-positive sequence component by calculation, overlapped with the specified value of the positive sequence current of the fundamental wave of the rotor; after adjustment, the specified value of the voltage of the rotor is output which is used for controlling an inverter at the rotor side to feed a needed field current to a rotor winding of the double-feed generator; thereby restraining the adverse effects caused by the current imbalance and aberrance of the stator by detecting the voltage of the stator and the positive sequence component and the non-positive sequence component of the fundamental wave of the current as well as carrying out overlapping control of the rotor current.

Description

technical field [0001] The invention relates to a method for suppressing the unbalance and distortion of the stator current of a double-fed wind power generating set, and belongs to the control field of the double-fed wind power generating set. Background technique [0002] Double-fed wind power generation technology is the mainstream technology widely used in large-scale wind turbines. This technology controls the rotor current of the generator through the power electronic converter, so that the wind generator can realize variable speed and constant frequency operation, which greatly improves the While improving the power generation efficiency, it realizes the independent adjustment of the output active power and reactive power of the generator. Compared with the direct-drive variable-speed constant-frequency wind power generation technology, the capacity of the power electronic converter is small, and the total cost of the unit is also greatly reduced. [0003] The doubly...

Claims

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Application Information

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IPC IPC(8): H02P9/00H02J3/38
CPCY02E10/763Y02E10/76
Inventor 王彤刘雪菁
Owner NARI TECH CO LTD
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