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Doubly fed induction generator (DFIG) asymmetric short circuit current analytic method considering crowbar protection actions

A technology of crowbar protection and double-fed wind turbines, which is applied in the field of fault analysis of wind power generation systems, and can solve problems such as complex transient characteristics

Active Publication Date: 2019-03-12
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

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

Method used

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  • Doubly fed induction generator (DFIG) asymmetric short circuit current analytic method considering crowbar protection actions
  • Doubly fed induction generator (DFIG) asymmetric short circuit current analytic method considering crowbar protection actions
  • Doubly fed induction generator (DFIG) asymmetric short circuit current analytic method considering crowbar protection actions

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Embodiment 1

[0106] Embodiment 1: This embodiment takes a grid-connected double-fed wind turbine as an example, assuming that a BC two-phase phase-to-phase short circuit occurs in the power grid at 0s, and the crowbar protection operates instantaneously. The voltage of phase A remains unchanged, the voltages of phase B and C are opposite to the voltage of phase A, and the voltage amplitude of phase B and C is half of the voltage amplitude of phase A. In the dq rotating coordinate system, the terminal voltage at steady state 1∠108°, positive sequence voltage 0.5∠108°, negative sequence voltage is 0.5∠108°, and the specific parameters of the double-fed fan after the crowbar protection action are shown in Table 1:

[0107] Table 1 Parameter setting of doubly-fed induction generator

[0108] parameter

Crowbar resistance R c

frequency f

Rotor side equivalent resistance R r

Stator equivalent resistance R s

Voltage initial phase angle α

Value (pu) ...

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Abstract

The invention discloses a doubly fed induction generator (DFIG) asymmetric short circuit current analytic method considering crowbar protection actions. Firstly, a positive-sequence component mathematical model and an inverted-sequence component mathematical model of a DFIG in forward-rotational coordinates and reverse-rotational coordinates are listed, flux linkage positive-sequence components ofa stator and a rotor after a failure, current positive-sequence components of the stator and the rotor, flux linkage inverted-sequence components of the stator and the rotor after the failure, and current inverted-sequence components of the stator and the rotor are calculated according to the two mathematical models in combination with the principle of constant flux linkage; then the positive-sequence components and the inverted-sequence components of the stator and the rotor are transformed from the forward-rotational and reverse-rotational coordinate systems to a three-phase static coordinate system; subsequently, the positive-sequence components and the inverted-sequence components of the stator and the rotor are superimposed to calculate currents of all phases of asymmetric short circuit currents of the stator and the rotor of the DFIG while considering crowbar protection actions. The method can accurately calculating DFIG asymmetric short circuit currents considering crowbar protection actions, and is of great significance to device selection and protection action analysis of a power system including a DFIG.

Description

technical field [0001] The invention relates to a method for analyzing the asymmetric short-circuit current of a doubly-fed fan taking into account the protection action of a crowbar, 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 has 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 relying on external ener...

Claims

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Application Information

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IPC IPC(8): H02J3/38H02P21/14H02P21/22
CPCH02J3/386H02P21/14H02P21/22Y02E10/76
Inventor 范小红孙士云孙德娟王杨张雪娟郑新宇
Owner KUNMING UNIV OF SCI & TECH
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