Faulty operation method of doubly-fed wind turbine under direct power control

A technology for wind turbines and power control, applied in motor generator control, electronic commutation motor control, and generator control, etc., can solve problems such as unit damage, increase hardware costs, and affect power grid stability.

Inactive Publication Date: 2017-09-08
HENAN NORMAL UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method increases the cost of hardware, and absorbs a large amount of reactive power from the grid when a fault occurs, which affects the stability of the grid, and the transient electromagnetic impact on the grid and the mechanical impact of the wind turbine are very serious.
When the grid voltage has a single-phase 90% or three-phase symmetrical drop of 70% or more serious faults, the rotor current of the doubly-fed wind turbine can hardly be controlled within 2 times the rated current, which will cause serious damage to the unit.

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
  • Faulty operation method of doubly-fed wind turbine under direct power control
  • Faulty operation method of doubly-fed wind turbine under direct power control
  • Faulty operation method of doubly-fed wind turbine under direct power control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0026] The present invention will be further described below in conjunction with the accompanying drawings. figure 1 For doubly-fed wind turbines at rotor speed ω r The equivalent circuit diagram in the rotating two-phase rotor coordinate system, U s r , U r r are the stator and rotor voltages, respectively, R s , R r are the stator and rotor resistances, respectively, I s r , I r r are the stator and rotor currents, respectively, L ls , L lr , L m respectively represent the stator leakage inductance, rotor leakage inductance and stator-rotor mutual inductance, Ψ s r , Ψ r r are the stator flux and rotor flux, respectively. Depend on figure 1 The stator voltage, rotor voltage, stator flux and rotor flux formulas of the doubly-fed wind turbine can be written, paving the way for the following specific analysis.

[0027] figure 2 is the relationship between stator flux linkage and rotor flux linkage in the coordinate system of stator orientation an...

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 fault operation method under direct power control of a doubly-fed wind power generator. The control method avoids complex coordinate transformation and compensation adjustment in vector control, and the control command is simple and direct, and is easy to implement. , the rotor flux linkage flux weakening predictive control is adopted, the given value of the rotor flux linkage is calculated by the actual value of the stator flux linkage, and the discrete model of the converter voltage on the rotor side of the doubly-fed wind turbine is used to predict the different switching states of the converter at the next moment The dynamic behavior of the seven voltage vectors is evaluated by the value function, and finally the voltage vector that minimizes the value function is selected. This algorithm can predict the optimal switching state in each sampling period as the switching signal of the converter. The invention does not need synchronous rotating coordinate system conversion and PI regulator design, has fast dynamic response, simple control instructions, and is easy to implement, and improves the fault operation capability of the double-fed wind power generator during the fault process.

Description

technical field [0001] The invention belongs to the technical field of control of a doubly-fed wind power generator rotor side converter, and is respectively aimed at a direct power control method when the grid voltage is in a steady state and a rotor flux-linkage flux-weakening predictive control method when the grid voltage suddenly drops. Background technique [0002] Wind energy is a random, explosive, and uncertain energy source. The random fluctuation of electric energy generated by the wind power generation system has a great impact on the power grid. How to maintain the voltage of the power grid when the wind power generation system and power loads are in a fluctuating state The amplitude and frequency are within the allowable range, and how to ensure the stability of the grid operation during the dynamic adjustment process of the wind turbine is the requirement of the wind power generation system for the grid. These problems must be seriously faced and resolved, oth...

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): H02P21/10H02P21/14
Inventor 王萌逯亚莹施艳艳郭彩霞高金辉
Owner HENAN NORMAL 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