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A dfig control method based on sliding mode + repetition

A control method and sliding mode technology, applied in control systems, control generators, vector control systems, etc., can solve problems such as adverse effects on system stability, and achieve the effect of reducing control delay and enhancing rapidity

Active Publication Date: 2018-03-13
HANGZHOU DIANZI UNIV
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AI Technical Summary

Problems solved by technology

Too many resonant regulators will cause more closed-loop poles in the system, which will adversely affect the stability of the system, such as figure 1 shown

Method used

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  • A dfig control method based on sliding mode + repetition
  • A dfig control method based on sliding mode + repetition
  • A dfig control method based on sliding mode + repetition

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Embodiment Construction

[0044] In order to describe the present invention more specifically, the DFIG control method of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0045] In this embodiment, the motor parameters of the DFIG to be controlled are as shown in Table 1:

[0046] Table 1

[0047]

[0048] Such as figure 2 As shown, a DFIG control method based on sliding mode + repetition includes the following steps:

[0049] (1) Use the Hall voltage sensor 1 to collect the three-phase stator voltage U of DFIG sa ~ U sc , using the Hall current sensor 2 to collect the three-phase stator current I of DFIG sa ~I sc and the three-phase rotor current I ra ~I rc ; Use encoder 3 to detect the rotational speed ω and rotor position angle θ of DFIG r ;

[0050] Firstly, use the Parke transformation module 4 to calculate the three-phase stator voltage U according to the following formula sa ~ U sc and three-phase sta...

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Abstract

The invention discloses a Slip form and repeation-based DFIG control method. The d-axis rotor current and the q-axis rotor current of a DFIG are directly controlled in the slip form control manner. In this way, the decoupling control over the active power and the reactive power of the DFIG is realized, so that the dynamic response capability of the system is greatly improved. According to the technical scheme of the invention, the stator current is adjusted in the repeated control manner, so that the harmonic component of an arbitrary order in the stator current, caused by the harmonic wave of an arbitrary order in the voltage of a power grid, can be eliminated. Therefore, the sinusoidal three-phase stator current output can be balanced. Compared with the conventional control method, the method is better in dynamic adjustment capability, and can inhibit the harmonic stator current of an arbitrary order. Furthermore, the control effect of the DFIG is enhanced. The method can be better applied to the actual condition of the power grid with the harmonic contamination condition thereof to be difficult to forecast.

Description

technical field [0001] The invention belongs to the technical field of wind power generation control, in particular to a DFIG control method based on sliding mode + repetition. Background technique [0002] AC excitation double-fed induction generator (doubly fed induction generator, DFIG) has the advantages of variable speed and constant frequency operation, independent decoupling control of active power and reactive power, and small inverter capacity, and has been widely used in the field of wind power generation. Among them, the stator of DFIG is directly connected to the power grid, and the status of the power grid will directly affect the operation of the system. my country's national standards GB / T15543-2008 "Power Quality Three-phase Voltage Unbalance" and GB / T14549-1993 "Power Quality-Public Power Grid Harmonics" allow the existence of certain negative sequence voltage and harmonics in the normal operation of the power grid Voltage. Under this power grid, the output...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02P21/22H02P21/18
CPCH02J3/386H02P21/0007Y02E10/76
Inventor 全宇
Owner HANGZHOU DIANZI UNIV
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