A Control Method of dfig System Based on Repeated Sliding Mode

A control method and sliding mode technology, applied in control systems, control generators, vector control systems, etc., can solve the problems that the current distortion and torque ripple cannot be suppressed, and the output current of the DFIG wind power system is difficult to meet the grid-connected regulations.

Active Publication Date: 2018-06-12
HANGZHOU DIANZI UNIV
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Problems solved by technology

When other harmonic voltages appear in the actual grid, the DFIG wind power operation control system that only considers unbalanced and 5th and 7th harmonic grid voltages will not be able to suppress the current distortion and torque ripple caused by other harmonic voltages The situation makes it difficult for the output current of the DFIG wind power system to meet the requirements of grid-connected regulations, such as figure 1 shown

Method used

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  • A Control Method of dfig System Based on Repeated Sliding Mode
  • A Control Method of dfig System Based on Repeated Sliding Mode
  • A Control Method of dfig System Based on Repeated Sliding Mode

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Embodiment Construction

[0070] In order to describe the present invention more specifically, the DFIG system control method of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0071] In this embodiment, the parameters of the DFIG power generation system to be controlled are shown in Table 1:

[0072] Table 1

[0073]

[0074] Such as figure 2 As shown, a DFIG system control method based on repeated sliding mode includes the following steps:

[0075] For DFIG machine-side converter 1 control:

[0076] A1. Use the Hall voltage sensor 3 to collect the three-phase stator voltage U of DFIG sa ~ U sc , using the Hall current sensor 4 to collect the three-phase stator current I of DFIG sa ~I sc and the three-phase rotor current I ra ~I rc ; Utilize the photoelectric encoder 5 to detect the rotational speed ωr of DFIG and the rotor position angle θ r .

[0077] Firstly, the three-phase stator voltage U is respectiv...

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Abstract

The invention discloses a DFIG system control method based on a repetition sliding mode. A repetition controller is added to a construction sliding mode face, so the system has the capability in controlling any harmonic wave. Through the method, motor electromagnetic torque ripples caused by power grid voltage harmonic waves and harmonic waves of the output current of the system can be eliminated, and prolongation of the life of the blower fan machinery and wind-electricity grid connected harmonic wave standards can be satisfied. According to the method, extraction for each harmonic component is not required, adding extra resonance controllers is not required, control on any subharmonic wave can be realized, and the method makes the system be applicable.

Description

technical field [0001] The invention belongs to the technical field of wind power generation control, and in particular relates to a DFIG system control method based on repeated sliding mode. Background technique [0002] In order to solve the problem of fossil energy crisis and greenhouse gas pollution, it has become a global consensus to develop and utilize clean and efficient renewable energy to achieve sustainable development. Among them, wind energy is the renewable energy with the most large-scale development and utilization value in the near future. The wind power generation system based on AC excitation doubly fed induction generator (DFIG) has many advantages such as variable speed and constant frequency operation, independent decoupling control of active power and reactive power, and small capacity of frequency converter. a wide range of applications. In this system, the stator of DFIG is directly connected to the grid, and the status of the grid will directly af...

Claims

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Application Information

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