A Stator Harmonic Current Suppression Method Based on Backstepping Control for Doubly-fed Asynchronous Wind Turbine Under Distorted Grid

A wind turbine and reverse thrust control technology, which is applied to control generators, control generators, control systems, etc. through magnetic field changes, and can solve the problem that the switching frequency of the converter is not fixed, the number of current harmonics is not fixed, and the reactive power fluctuates. Larger and other problems, to achieve the effect of excellent stator harmonic current output suppression effect, less adjustment parameters, and easy engineering implementation.

Active Publication Date: 2017-08-08
ZHEJIANG UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the strict magnetic field orientation and complex coordinate changes required by vector control, and the slow dynamic response speed brought by the proportional integral controller make its engineering application effect not good
The direct power control method of the look-up table method has a simple structure, does not require complex coordinate transformation, and has a fast dynamic response. However, the hysteresis controller makes the active and reactive power fluctuate greatly in the steady state, and the switching frequency of the converter is not fixed, resulting in the current harmonic order. , the filter design is more difficult

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A Stator Harmonic Current Suppression Method Based on Backstepping Control for Doubly-fed Asynchronous Wind Turbine Under Distorted Grid
  • A Stator Harmonic Current Suppression Method Based on Backstepping Control for Doubly-fed Asynchronous Wind Turbine Under Distorted Grid
  • A Stator Harmonic Current Suppression Method Based on Backstepping Control for Doubly-fed Asynchronous Wind Turbine Under Distorted Grid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] figure 1 The system structure of the double-fed induction wind turbine is shown. According to the principle of constant amplitude transformation, the vector form voltage equation and flux equation of the mathematical model of the rotor-side converter in the stator two-phase static α-β coordinate system can be expressed as Available:

[0045]

[0046]

[0047] Then it can be deduced that:

[0048]

[0049] The derivatives of active and reactive power absorbed by the stator of the doubly-fed induction wind turbine from the grid can be expressed as:

[0050]

[0051] Substitute and derive the apparent power expression:

[0052]

[0053] Among them, u 1 =Σj(ω h -ω f )U sαβ_h Ignorable.

[0054] Decoupling to obtain the active and...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a stator harmonic current suppression method based on reverse push control of a doubly-fed asynchronous wind power generator under a distorted power grid. Under the unified mathematical model of machine ideal and harmonic grid voltage, the reverse push control algorithm is designed, and the decoupling control of active and reactive power is realized. The invention overcomes the disadvantages of poor dynamic performance of traditional vector control, and at the same time, due to the difficulty of engineering realization due to complex coordinate transformation and strict magnetic field orientation, it also overcomes the defect of poor steady-state performance of direct power control of traditional look-up table method, and can be used in ideal power grids. Excellent dynamic and static performance under the conditions.

Description

technical field [0001] The invention belongs to the technical field of wind power generator control, and in particular relates to a stator harmonic current suppression method based on backstepping control of a doubly-fed asynchronous wind power generator under a distorted power grid. Background technique [0002] In the doubly-fed asynchronous wind generator (DFIG) system, the generator stator is directly connected to the power grid through a transformer, and the disturbance in the power grid will directly affect the operation of the generator itself. In addition, the capacity of the excitation converter connected to the rotor is limited, and it can only control the generator with limited capacity. Compared with the wind power generation system based on the full power converter, the doubly-fed asynchronous wind power system is very sensitive to grid faults. The ability to bear is also poor. At the same time, with more and more nonlinear loads and single-phase loads, the num...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): H02P9/14H02P101/15
Inventor 孙丹熊平化
Owner ZHEJIANG UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap