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Potential angle model of doubly fed induction generator (DFIG) and derivation method of potential angle model

A wind turbine, doubly-fed induction technology, which is used in the control of generators, motor generator control, and control of generators through magnetic field changes, and can solve problems such as difficult angles.

Inactive Publication Date: 2015-10-21
HOHAI UNIV
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  • Abstract
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  • Claims
  • 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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  • Potential angle model of doubly fed induction generator (DFIG) and derivation method of potential angle model
  • Potential angle model of doubly fed induction generator (DFIG) and derivation method of potential angle model
  • Potential angle model of doubly fed induction generator (DFIG) and derivation method of potential angle model

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Embodiment Construction

[0069] 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:

[0070]

[0071] 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 a potential angle model of a doubly fed induction generator (DFIG) and a derivation method of the potential angle model. Practical variables of a polar coordinate form and a rectangular coordinate form are redefined, and a DFIG potential angle model is proposed. The model is characterized by: using potential, angle and rotating speed as state variables, and being similar to a synchronous generator equation in form; being in favor of understanding an potential angle in the DFIG, and being in favor of analytical calculation of power angle stabilization and voltage stabilization; and accurately taking influence of a frequency change into consideration. The potential angle model of the DFIG provides a theoretical basis for intensively studying an excitation control strategy of the DFIG, and provides a model basis for using DFIG unit excitation control to improve stability of a power grid.

Description

technical field [0001] The invention relates to a potential angle model of a doubly-fed induction wind power generator, and also relates to a derivation method of the potential angle model of a doubly-fed induction wind power generator, which belongs 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 bee...

Claims

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Application Information

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IPC IPC(8): H02P9/14H02P101/15H02P21/14
Inventor 鞠平黄桦金宇清高远
Owner HOHAI UNIV
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