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Fault operation method under doubly-fed wind power generator stator and rotor flux weak magnetic control

A wind turbine and rotor flux linkage technology, which is applied in the direction of controlling generators, control systems, electrical components, etc., can solve problems such as unit damage, achieve small fluctuations in active power and reactive power, improve the ability to operate without going out of the grid, The effect of small electromagnetic torque ripple

Inactive Publication Date: 2015-10-21
HENAN NORMAL UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

When the grid voltage drops 60% or more serious faults in single-phase or three-phase symmetry, the rotor current of the doubly-fed wind turbine can hardly be controlled within 2 times the rated current, which will cause serious damage to the unit

Method used

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  • Fault operation method under doubly-fed wind power generator stator and rotor flux weak magnetic control
  • Fault operation method under doubly-fed wind power generator stator and rotor flux weak magnetic control
  • Fault operation method under doubly-fed wind power generator stator and rotor flux weak magnetic control

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Embodiment Construction

[0021] The present invention will be further described below in conjunction with the accompanying drawings. figure 1 two-phase stator α β Stationary coordinate system, two-phase rotor angular velocity ω r to rotate α r β r Coordinate system, two-phase synchronous speed ω e to rotate d q Coordinate System. The control method of the present invention is based on the two-phase static coordinate system, the variables on the stator side and the rotor side, after coordinate conversion, the two-phase static α β variables in the coordinate system.

[0022] figure 2 static in two phases α β Equivalent circuit in DFIG vector form in the coordinate system, two-phase stationary α β The DFIG stator and rotor voltage, flux linkage, and electromagnetic torque equations in vector form in the coordinate system can be expressed as:

[0023] (1)

[0024] (2)

[0025] (3)

[0026] (4)

[0027] (5)

[0028] In the formula: R s , R r are the stator and ...

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Abstract

The invention discloses a fault operation method under doubly-fed wind power generator stator and rotor flux weak magnetic control. The technical scheme is as follows: when the grid voltage runs stably, a doubly-fed wind power generator rotor-side converter adopts vector control based on stator flux orientation, and when the grid voltage runs in fault, the doubly-fed wind power generator rotor-side converter performs stator and rotor flux weak magnetic control, and the control frequency of stator and rotor flux weak magnetic control is twice that of vector control based on stator flux orientation. No complex coordinate transformation is needed in the fault period, and quick response to a fault is realized. The rotor current can be controlled within 1.5-1.6 times of the rated current. The electromagnetic torque ripple is small. The fluctuation of active power and reactive power at the stator side is small. The operation capacity of a doubly-fed wind power generator in fault is improved.

Description

technical field [0001] The invention belongs to the technical field of doubly-fed wind-driven generator operation control, and in particular relates to a control method for improving the fault-running capability of a doubly-fed wind-driven generator when a grid voltage dips in failure. Background technique [0002] In order to solve the increasingly urgent problems of energy security and environmental degradation, the development and utilization of renewable energy, especially wind energy, has become the most effective solution. As a mainstream type of doubly-fed wind turbine, since its stator winding is directly connected to the power grid, and the rotor winding is excited through back-to-back double converters, the capacity of this excitation frequency converter is small, so its ability to resist grid disturbance is weak. In the case of falling, it is easy to cause negative reactions such as output power fluctuations, current harmonics, and continuous pulsation of electrom...

Claims

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Application Information

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IPC IPC(8): H02P9/10
Inventor 王萌逯亚莹施艳艳马鹏飞刘玉伟
Owner HENAN NORMAL UNIV
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