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Derivation Method of Potential Angle Model of Doubly-fed Induction Wind Turbine

A wind power generator, double-fed induction technology, applied in the control of generators, motor generator control, control of generators through magnetic field changes, etc., can solve problems related to difficult angles

Inactive Publication Date: 2017-09-26
HOHAI UNIV
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  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a kind of potential angle model of the doubly-fed induction wind power generator, solve the technology that the DFIG model in the prior art is in the form of rectangular coordinates, and is difficult to be directly used in the research of angle-related problems question

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  • Derivation Method of Potential Angle Model of Doubly-fed Induction Wind Turbine
  • Derivation Method of Potential Angle Model of Doubly-fed Induction Wind Turbine
  • Derivation Method of Potential Angle Model of Doubly-fed Induction Wind Turbine

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Embodiment Construction

[0066] The electric potential angle model of the doubly-fed induction wind power generator proposed by the present invention uses electric potential, angle and rotational speed as state variables, and is similar in form to the synchronous generator equation, which is beneficial to the understanding of the electric potential angle in the DFIG and is conducive to the stability of the power angle and the analysis and calculation of voltage stability; accurately taking into account the influence of frequency changes, it provides a theoretical basis for in-depth study of DFIG excitation control strategy, and provides a model basis for using DFIG unit excitation control to improve the stability of the power grid. The angular model is as follows:

[0067]

[0068] In the formula: L=L ss , L ss is the stator winding inductance, L m is the mutual inductance between the stator winding and the rotor winding, L rr is the rotor winding inductance, R r is the rotor winding resistan...

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Abstract

The invention discloses an electric potential angle model of a doubly-fed induction wind power generator and a derivation method thereof, redefines practical variables in polar coordinate form and rectangular coordinate form, and proposes a DFIG electric potential angle model. The characteristics of this model are: the electric potential, angle and rotational speed are taken as the state variables, and the form is similar to the synchronous generator equation; and the effect of frequency changes. The invention provides a theoretical basis for in-depth research on the excitation control strategy of the DFIG, and provides a model basis for improving the stability of the power grid by utilizing the excitation control of the DFIG unit.

Description

technical field [0001] The invention relates to a derivation method of an electric potential angle model of a doubly-fed induction wind power generator, belonging to the technical field of generators. Background technique [0002] At present, the variable speed and constant frequency technology based on power electronic converters is widely used in wind turbines, and the double-fed induction wind generator (DFIG) is one of the representative models. The DFIG unit realizes the characteristics of maximum power tracking and active and reactive power decoupling control through the control of AC excitation, and is the mainstream model used in current grid-connected wind farms. With the increase of wind power grid-connected capacity, the interaction between wind power generation system and power grid has become the focus of research, and the wind turbine model as the research basis has also been extensively studied. The complete DFIG unit model includes wind turbine model, genera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P9/14H02P101/15H02P21/14
Inventor 鞠平黄桦金宇清高远
Owner HOHAI UNIV
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