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Harmonic voltage proportion feedforward compensation method based on voltage source output doubly-fed wind turbine generator

A doubly-fed wind turbine, harmonic voltage technology, applied in the direction of motor generator control, electronic commutation motor control, generator control, etc., can solve the problems of less harmonic voltage suppression, complex controller structure, poor impedance adaptability, etc. , to achieve the effect of increasing stability, simple and effective implementation, and realizing harmonic voltage

Active Publication Date: 2018-08-21
HEFEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is only suitable for doubly-fed generators based on the current source mode, suppressing stator harmonic currents, and the controller has a complex structure, so the impedance adaptability is poor under weak power grids
[0006] In short, the existing research is mainly based on harmonic suppression under current source grid-connected or voltage source island operation, but there are few related studies on harmonic voltage suppression under the condition of DFIG voltage source output drooping grid-connected

Method used

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  • Harmonic voltage proportion feedforward compensation method based on voltage source output doubly-fed wind turbine generator
  • Harmonic voltage proportion feedforward compensation method based on voltage source output doubly-fed wind turbine generator
  • Harmonic voltage proportion feedforward compensation method based on voltage source output doubly-fed wind turbine generator

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Embodiment Construction

[0054] The experimental platform in this embodiment uses a frequency converter to drive a three-phase squirrel-cage asynchronous motor to drive a doubly-fed generator, and uses a diode uncontrolled rectification bridge to connect a resistive load to simulate a nonlinear load. The doubly-fed generator in the simulation platform is a wound induction motor, and its rated parameters are: power 11kw, rated speed 1475r / min, stator 380V / 17.6A, rotor 858V / 8.1A; stator resistance Rs=0.285Ω , rotor resistance Rr = 0.2983Ω, stator leakage reactance Ls = 0.001323H, rotor leakage reactance Lr = 0.001781H, excitation reactance Lm = 0.0676H.

[0055] The composition of the doubly-fed induction wind turbine includes: a wind turbine, an induction motor, a rotor-side converter and a DC-side capacitor, and the induction motor includes a rotor and a stator. The wind energy captured by the wind turbine is converted into electrical energy and injected into the grid through the induction motor, and ...

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Abstract

The invention discloses a harmonic voltage proportion feedforward compensation method based on a voltage source output doubly-fed wind turbine generator. The method includes the steps of 1, data sampling and data conversion, 2, droop control, 3, voltage and current control looping, and 4, selection of an R regulator and the harmonic voltage proportion feedback coefficient of the R regulator. By means of the method, the harmonic voltage content and output power pulsation of a grid connection point can be effectively reduced, and the electric energy quality of the doubly-fed generator can be improved.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a method for suppressing grid-connected harmonics of a doubly-fed wind power generator voltage source by adopting harmonic voltage proportional feedforward compensation control. Background technique [0002] In the actual power system, due to the remote location of the wind farm and the distance from the large power grid, the characteristics of the integrated grid are actually weak, that is, the grid impedance is relatively large. When the local load contains a nonlinear load, the harmonic current generated by the nonlinear load will generate a harmonic voltage drop on the grid impedance, so that the common coupling point of the public grid-connected grid directly connected to the stator side of the doubly-fed generator (point of common coupling (PCC) voltage distortion, affecting the normal operation of the local linear load. With the continuous expansion of the installed c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02P9/10H02P21/22H02P101/15
CPCH02J3/386H02P9/105H02P21/22H02P2101/15Y02E10/76
Inventor 谢震高翔张兴李梦杰杨淑英
Owner HEFEI UNIV OF TECH