Unlock instant, AI-driven research and patent intelligence for your innovation.

Power curve optimization method and system for improving frequency modulation capability of doubly-fed wind turbine generator

A double-fed wind turbine, power curve technology, applied in wind power generation, reducing/preventing power oscillation, electrical components, etc., can solve problems such as secondary frequency drop, achieve short deceleration stage time, alleviate drop, and improve wind energy utilization rate effect

Pending Publication Date: 2022-03-01
HUAZHONG UNIV OF SCI & TECH
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a power curve optimization method and system for improving the frequency modulation capability of the doubly-fed wind turbine, which is used to solve the secondary frequency drop existing in the inertia control of the prior art question

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
  • Power curve optimization method and system for improving frequency modulation capability of doubly-fed wind turbine generator
  • Power curve optimization method and system for improving frequency modulation capability of doubly-fed wind turbine generator
  • Power curve optimization method and system for improving frequency modulation capability of doubly-fed wind turbine generator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The doubly-fed wind power generation system adopts such as figure 1 The double closed-loop control strategy of power outer loop and current inner loop is shown. The reference value of output active power is obtained by using MPPT control when there is no frequency drop, and when a frequency event occurs, switch the doubly-fed wind turbine from the MPPT control mode to the short-time overload control mode to achieve frequency modulation. U in the picture sabc , I sabc are the stator voltage and stator current values ​​in the three-phase static coordinate system respectively, and the stator voltage U in the two-phase static coordinate system is obtained through coordinate transformation sα , U sβ and the stator current I sα , I sβ ; The angular frequency of the grid-connected point voltage measured by the phase-locked loop is ω s , rotor angular frequency ω r , slip angular frequency ω 2 = ω s -ω r , slip Slip angular frequency ω 2 Integrate to get the slip ...

Embodiment 2

[0083] A power curve optimization system for improving the frequency modulation capability of a doubly-fed wind turbine, including: a memory and a processor, the memory stores a computer program, and the processor performs the improvement provided by Embodiment 1 of the present invention when executing the computer program The steps of the power curve optimization method for the frequency modulation capability of the doubly-fed wind turbine.

[0084] The relevant technical solutions are the same as those in Embodiment 1, and will not be repeated here.

Embodiment 3

[0086] A machine-readable storage medium, the machine-readable storage medium stores machine-executable instructions, and when the machine-executable instructions are called and executed by a processor, the machine-executable instructions cause the processor to implement the present invention. The power curve optimization method for improving the frequency modulation capability of the doubly-fed wind turbine provided by the first embodiment of the invention.

[0087] The relevant technical solutions are the same as those in Embodiment 1, and will not be repeated here.

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 power curve optimization method and system for improving the frequency modulation capability of a doubly-fed wind turbine generator, and the method comprises the steps: switching the doubly-fed wind turbine generator from an MPPT control mode to a short-time overload control mode to achieve the frequency modulation when a frequency accident occurs in the system; in a short-time overload control mode, an output active power reference value is controlled to be increased to a power limit corresponding to an initial rotating speed under a torque limit condition, then is reduced to a mechanical power value captured by a fan corresponding to a point C along a parabola BM, and finally is reduced to a maximum wind energy tracking power corresponding to a point D along an arc CA; wherein the parabola BM passes through the point B by taking the point M as a vertex, the opening of the parabola BM is upward, the arc CA passes through the point C and the point A, and an intersection point except an end point exists between the arc CA and the MPPT curve; the point C is an intersection point of the parabola BM and the mechanical power curve; the point D is an intersection point of the arc CA and the MPPT curve except the end point; according to the method, the lowest point of frequency drop is improved, the method has higher frequency supporting capacity, and the problem of secondary power grid frequency drop is also avoided.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and more specifically relates to a power curve optimization method and system for improving the frequency modulation capability of a doubly-fed wind turbine. Background technique [0002] Double-fed wind turbines have the advantages of bidirectional flow of energy, wide speed range, active and reactive power decoupling control, rotor excitation, etc., and have become a widely used type of wind turbine in the market. With the increasing penetration of wind power in the power grid, in order to maintain the safe and stable operation of the power system, countries have proposed strict grid-connected specifications for wind turbines, and the inertia response capability of wind turbines has attracted much attention. However, since the DFIG usually works on the Maximum Power Point Tracking (MPPT) curve, the speed of the DFIG and the grid frequency are no longer directly coupled. Therefore...

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
IPC IPC(8): H02J3/48H02J3/38H02J3/24
CPCH02J3/48H02J3/381H02J3/241H02J2300/28Y02E10/76
Inventor 周仪旎朱东海邹旭东胡家兵康勇
Owner HUAZHONG UNIV OF SCI & TECH