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Control method based on dual-vector resonance adjusting double-fed asynchronous wind driven generator

A technology for wind turbines and resonance regulation, which is used in motor generator control, vector control system, electronic commutation motor control, etc. adverse effects, etc.

Active Publication Date: 2015-03-18
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The extraction of positive and negative sequences and harmonic components mentioned above introduces a large number of coordinate rotation transformations and notch filters, resulting in a large control delay, which is likely to cause unstable operation of the system and reduce the rapidity of system response
In addition, the calculation process of the rotor current reference value is complicated, and the calculation results need to be rotated to the positive synchronous speed rotating coordinate system, which also adversely affects the rapidity and stability of the system operation

Method used

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  • Control method based on dual-vector resonance adjusting double-fed asynchronous wind driven generator
  • Control method based on dual-vector resonance adjusting double-fed asynchronous wind driven generator
  • Control method based on dual-vector resonance adjusting double-fed asynchronous wind driven generator

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Embodiment Construction

[0035] In order to describe the present invention more specifically, the DFIG control method of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0036] like figure 2 As shown, a control method for doubly-fed asynchronous wind generator based on dual-vector resonance regulation, including the following steps:

[0037] (1) Utilize Hall voltage sensor 5 to gather the three-phase stator voltage U of DFIG sa ~ U sc , using the Hall current sensor 4 to collect the three-phase stator current I of DFIG sa ~ I sc , three-phase rotor current I ra ~ I rc ; Utilize encoder 7 to detect the rotational speed ω of DFIG r and the rotor position angle θ r ; Use the enhanced phase-locked loop 9 to detect the angular frequency ω of the positive sequence component in the three-phase grid voltage 1 and phase θ 1 ;

[0038] First, use the Clarke transformation module 10 to respectively transform the three-pha...

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Abstract

The invention discloses a control method based on a dual-vector resonance adjusting double-fed asynchronous wind driven generator. The control method utilizes dual-vector resonance adjusting technology. Vector resonance adjusting with angular frequency being double base frequency can restrain adverse influence caused by negative sequence components in power grid voltage. Vector resonance adjusting with angular frequency being six-fold base frequency can adverse influences caused by five-time harmonic wave components and seven-time harmonic wave components in power grid voltage. No negative sequence and harmonic component extraction of power grid voltage, stator current or rotor current during all closed-loop adjusting is needed. By the method, no complex positive negative sequence and harmonic component extraction is needed, no complex rotor current reference calculation is needed, control delay is reduced greatly, and quickness and stability of a system is improved.

Description

technical field [0001] The invention belongs to the technical field of wind power generation control, and in particular relates to a control method for adjusting a doubly-fed asynchronous wind power generator based on double-vector resonance. Background technique [0002] As a clean and renewable energy, wind energy has been highly valued by countries all over the world in recent years. The reserves of wind energy are huge. With the development and utilization of wind energy, the global wind power generation has maintained rapid and continuous growth for many years. Doubly-fed asynchronous wind turbines are widely used due to their own constant-speed variable-frequency operation capabilities, the required converter capacity only accounts for about 30% of the unit capacity, and four-quadrant operation capabilities. However, DFIG (double-fed asynchronous wind generator) units operating under harsh grid voltage conditions such as imbalance and harmonic distortion will show sta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/00H02P21/14H02J3/01H02P21/20
CPCY02E40/40
Inventor 年珩
Owner ZHEJIANG UNIV
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