An analysis method for asymmetric short-circuit current of doubly-fed fan considering crowbar protection action

A doubly-fed fan and crowbar protection technology, applied in wind power generation, motor generator control, electronic commutation motor control, etc., can solve problems such as complex transient characteristics, achieve fast calculation speed, simplified calculation process, and physical concept clear effect

Active Publication Date: 2022-04-12
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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  • An analysis method for asymmetric short-circuit current of doubly-fed fan considering crowbar protection action
  • An analysis method for asymmetric short-circuit current of doubly-fed fan considering crowbar protection action
  • An analysis method for asymmetric short-circuit current of doubly-fed fan considering crowbar protection action

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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) 0.03...

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Abstract

The invention discloses an analysis method for the asymmetric short-circuit current of a doubly-fed fan considering the protection action of a crowbar. Combined with the principle of flux conservation, the positive sequence component of the stator and rotor flux, the positive sequence component of the stator and rotor current, the negative sequence component of the stator and rotor flux after the fault, and the negative sequence component of the stator and rotor current after the fault are calculated. Then transform the positive sequence and negative sequence components of the stator and rotor currents from the forward and reverse rotating coordinate system to the three-phase stationary coordinate system respectively, and then superimpose the positive and negative sequence components of the stator and rotor currents, that is, The phase currents of the stator and rotor asymmetric short-circuit of the DFIG taking into account the crowbar protection action; this method can accurately calculate the asymmetric short-circuit current of the DFIG taking into account the crowbar protection action. Equipment selection and protection action characteristic analysis are of great significance.

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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Patent Type & Authority Patents(China)
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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