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Faulty operation method of doubly-fed wind turbine stator-rotor flux linkage flux-weakening 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, Achieving a positive response

Inactive Publication Date: 2017-09-19
HENAN NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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  • Faulty operation method of doubly-fed wind turbine stator-rotor flux linkage flux-weakening control
  • Faulty operation method of doubly-fed wind turbine stator-rotor flux linkage flux-weakening control
  • Faulty operation method of doubly-fed wind turbine stator-rotor flux linkage flux-weakening 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 rotor...

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Abstract

The invention discloses a fault operation method for the flux-weakening control of the stator-rotor flux linkage of a doubly-fed wind power generator. The key points of the technical solution of the present invention are: the faulty operation method of the stator-rotor flux-linkage weakening control of the doubly-fed wind power generator, when the grid voltage is in steady state operation, the rotor-side converter of the doubly-fed wind power generator adopts the vector control based on the orientation of the stator flux linkage , when the grid voltage fault is running, the rotor-side converter of the double-fed wind turbine performs the stator-rotor flux-weakening control, and the control frequency of the stator-rotor flux-weakening control is set to be twice that of the vector control based on the stator flux orientation. The present invention does not need complex coordinate conversion during the occurrence of a fault, realizes a quick response to the fault, can effectively control the rotor current within 1.5-1.6 times the rated current, the electromagnetic torque fluctuation is small, and the stator side active power and The reactive power fluctuation is small, which improves the fault operation capability of the doubly-fed wind turbine.

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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Patent Type & Authority Patents(China)
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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