An analytical method for three-phase short-circuit current of doubly-fed induction generator after crowbar protection action

A technology of crowbar protection and double-fed induction, which is applied in the field of analysis of three-phase short-circuit current of double-fed induction wind turbines, can solve problems such as complex transient characteristics, and achieve the effect of simplifying the calculation process

Active Publication Date: 2021-10-22
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

But on the other hand, the transient characteristics of grid-connected doubly-fed induction wind turbines are quite complicated when the grid-connected voltage dips, which is different from traditional synchronous and asynchronous motors.

Method used

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  • An analytical method for three-phase short-circuit current of doubly-fed induction generator after crowbar protection action
  • An analytical method for three-phase short-circuit current of doubly-fed induction generator after crowbar protection action
  • An analytical method for three-phase short-circuit current of doubly-fed induction generator after crowbar protection action

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Effect test

Embodiment 1

[0065] Embodiment 1: the analysis method of the three-phase short-circuit current of the doubly-fed induction wind-driven generator after a kind of crowbar protection action, the steps are as follows:

[0066] Step 1: According to the equivalent circuit diagram of the doubly-fed induction wind turbine after the crowbar protection action ( figure 2 ) to write the stator and rotor voltage equations in the dq rotating coordinates, write the stator and rotor flux equations in the dq rotating coordinates according to the self-inductance flux linkage and mutual inductance flux linkage of the double-fed induction wind turbine stator and rotor, and then establish the stator and Rotor flux equation, derived stator and rotor current equations;

[0067] Step 2: According to the stator voltage equation written in step 1 and the flux conservation principle, obtain the analytical formula of the stator flux linkage after the fault;

[0068] Step 3: Perform Laplace transformation on the rot...

Embodiment 2

[0111] Embodiment 2: This embodiment takes a grid-connected doubly-fed induction wind turbine as an example, assuming that at t 0 When a three-phase short-circuit fault occurs in the system at any time, the specific parameters of the doubly-fed induction wind turbine after the crowbar protection action are shown in Table 1:

[0112] Table 1 Parameter setting of doubly-fed induction generator

[0113] parameter Terminal voltage amplitude U m

Coefficient of voltage drop degree k Rotor side equivalent resistance R r

Stator equivalent resistance R s

Voltage initial phase angle α Value (pu) 1 0.9 0.016 0.023 108° parameter Stator leakage inductance L σs

Rotor leakage inductance L σr

Exciting inductance L m

Synchronous speed ω 1

Rotor speed ω r

Value (pu) 0.18 0.16 2.9 1 1.2 parameter crowbar circuit resistance R c

frequency f value 0.032pu 50Hz

[0114] Accor...

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Abstract

The invention relates to a method for analyzing the three-phase short-circuit current of a doubly-fed induction wind generator after the protection action of a crowbar, and belongs to the technical field of wind power generation system fault analysis. The invention uses the DFIG stator and rotor voltage equations and stator and rotor flux linkage equations after the crowbar protection action to deduce the three-phase short-circuit current of the double-fed induction wind generator after the crowbar protection action, which simplifies the calculation process. The method can accurately calculate the three-phase short-circuit current of the doubly-fed induction wind turbine after the protection action of the crowbar, and is of great significance to the selection of power system equipment and the analysis of the protection action characteristics of the doubly-fed induction wind turbine.

Description

technical field [0001] The invention relates to a method for analyzing the three-phase short-circuit current of a doubly-fed induction wind power generator (DFIG) after a crowbar (Crowbar) protection action, and belongs to the technical field of fault analysis of wind power generation systems. Background technique [0002] With the development of the global economy and the substantial increase in energy consumption, the contradiction between energy storage, production and use has become increasingly prominent, and it has become one of the important problems to be solved urgently by countries all over the world. Therefore, in order to solve problems such as energy crisis and environmental pollution, the research and development of new energy sources such as wind energy and solar energy have become a very urgent demand for human beings. Among them, wind energy is a clean and sustainable energy. Compared with traditional energy sources, wind power has the characteristics of not...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14H02P101/15
CPCH02P21/14H02P2101/15
Inventor 范小红孙士云安德超孙德娟王杨海世芳张雪娟郑新宇
Owner KUNMING UNIV OF SCI & TECH
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