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Flux linkage analysis method for determining doubly fed induction generator-containing three-phase short circuit current

A doubly-fed induction, three-phase short-circuit technology, used in motor generator testing, measuring current/voltage, measuring electrical variables, etc., can solve problems such as different stator and rotor frequencies and inability to describe

Active Publication Date: 2014-04-02
CHONGQING UNIV
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Problems solved by technology

[0004] At present, the methods for studying the analytical formula of DFIG short-circuit current mainly include frequency domain calculation and physical process analysis. Due to the different frequencies of the stator and rotor, it cannot be described in the three-phase stator coordinate axis (stationary coordinate axis).

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  • Flux linkage analysis method for determining doubly fed induction generator-containing three-phase short circuit current
  • Flux linkage analysis method for determining doubly fed induction generator-containing three-phase short circuit current
  • Flux linkage analysis method for determining doubly fed induction generator-containing three-phase short circuit current

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Embodiment Construction

[0049] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0050] A flux linkage analysis method for determining the three-phase short-circuit current of a doubly-fed induction generator. This method uses the force component of the stator flux of the doubly-fed induction generator to be reduced to the stator side, and the DC component of the stator flux to be reduced to the rotor side. The static equivalent circuit analyzes the influence of the rotor resistance on the dynamic attenuation of the DC component of the stator flux linkage and the induction process with the rotor winding during a fault, and thus deduces the analytical expression of the stator short-circuit current of the doubly-fed induction generator when the three-phase short-circuit of the grid is short-circuited. Specific steps are as follows:

[0051] Step 1: The forced component of the stator flux linkage of the doubly-fed in...

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Abstract

The invention discloses a flux linkage analysis method for determining doubly fed induction generator-containing three-phase short circuit current. According to the method, an electromagnetic transient model of a doubly fed induction generator (DFIG) and fault transient characteristics of stator and rotor flux linkage are analyzed, after a grid is failed, the DFIG stator flux linkage direct current component induces alternating current flux linkage in reverse direction of the revolving speed direction at a rotor winding, the alternating current flux linkage cannot be described in three-phase stator coordinate axis (static coordinate axis), the DFIG stator flux linkage forced component needs to be treated by reduction to a stator side and stator flux linkage direct current component needs to be treated by reduction to a rotor side so as to form a static equivalent circuit, thus, in the case of fault, influence of rotor resistance on dynamic attenuation of the stator flux linkage direct current component and induction process of the stator flux linkage direct current component and the rotor winding is analyzed, and an analytical expression of DFIG stator short circuit current in the case of grid three-phase short circuit is deduced.

Description

technical field [0001] The invention relates to the technical field of wind power generation systems, in particular to a flux linkage analysis method for determining the three-phase short-circuit current of a doubly-fed induction generator. Background technique [0002] As the new energy technology with the most commercial development prospects, wind power has grown at a rate of more than 30% per year globally and has become the fastest-growing clean energy. The vigorous development of wind energy resources has promoted the rapid development of wind turbines. The double-fed induction generator (DFIG) is a wind turbine model widely used in wind power generation at the present stage. It has high efficiency, small converter capacity, and high power. decoupling control and many other advantages, but on the other hand, the transient characteristics of the grid-connected doubly-fed wind turbines are quite complex when the grid-connected voltage drops suddenly, which is very diffic...

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Application Information

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IPC IPC(8): G01R19/00G01R31/34
Inventor 周念成谢光莉王强钢罗艾青周川
Owner CHONGQING UNIV
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