Second-order slip form-based method for controlling doubly-fed wind generator (DFIG)

A second-order sliding mode and control method technology, which is applied to control systems, control generators, electrical components, etc., can solve problems such as occupying calculation time and software space codes, reducing the rapidity of system response, and losing the influence of harmonics

Active Publication Date: 2015-04-15
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] It can be seen from the above analysis process that the stator voltage and rotor current positive sequence, negative sequence, 5th and 7th harmonic component extraction in the implementation process of the DFIG traditional control method under the weak grid voltage takes up a lot of computing time and software. space code, and introduce a large control delay, which will easily cause unstable operation of the system and reduce the rapidity of system response
In addition, the existing control methods can only control the specified harmonics. When the power grid contains other harmonic distortions (such as 11th and 13th harmonic distortions), the control system will lose the ability to eliminate harmonic effects

Method used

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  • Second-order slip form-based method for controlling doubly-fed wind generator (DFIG)
  • Second-order slip form-based method for controlling doubly-fed wind generator (DFIG)
  • Second-order slip form-based method for controlling doubly-fed wind generator (DFIG)

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Embodiment Construction

[0054] 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.

[0055] In this embodiment, the motor parameters of the DFIG to be controlled are as shown in Table 1:

[0056] Table 1

[0057]

[0058]

[0059] Such as figure 2 As shown, a DFIG control method based on the second-order sliding mode includes the following steps:

[0060] (1) Use the Hall voltage sensor 5 to collect 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 and the three-phase rotor current I ra ~ I rc ; Utilize encoder 7 to detect the rotational speed ω and the rotor position angle θ of DFIG;

[0061] First, the three-phase stator voltage U is respectively calculated according to the following formula by using the Clarke transformation mo...

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Abstract

The invention discloses a second-order slip form-based method for controlling a doubly-fed wind generator (DFIG). According to the method, due to the adoption of direct torque control, the electromagnetic torque and reactive power of the DFIG can be controlled directly; and the complex steps of extracting positive and negative sequences and harmonic components and calculating a rotor current reference value are eliminated, so that the introduction of decomposition delay is avoided. Due to the adoption of second-order slip form control, the negative sequence and any low-order harmonic components can be regulated and controlled, and negative influence caused by network voltage imbalance and low-order harmonics in the reactive power and the electromagnetic torque can be controlled directly; and the are eliminated to fulfill the aim of stable torque and the output of the reactive power. Compared with the conventional control method, the second-order slip form-based method has the advantages that the occupied software space is reduced, and the dynamic regulation capacity is high, so that resources are saved, and the control effect on the DFIG is enhanced.

Description

technical field [0001] The invention belongs to the technical field of wind power generation control, and in particular relates to a DFIG control method based on a second-order sliding mode. Background technique [0002] Doubly-fed asynchronous wind turbine is the main type of modern large-scale wind turbine due to its own constant-speed variable-frequency operation capability, small required converter capacity and four-quadrant operation capability. However, the stator current of the DFIG (doubly-fed wind generator) unit operating under the condition of unbalanced grid voltage and harmonic distortion will be unbalanced and distorted, and the output active and reactive power and electromagnetic torque will have multiple frequency pulsations . The deterioration of the above performance indicators will cause great harm to the stable and reliable operation of large-scale wind power grid-connected power generation, and even threaten the reliable and stable operation of the grid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02P9/00
Inventor 年珩全宇
Owner ZHEJIANG UNIV
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