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Non-position sensor vector control method for double-feed wind power generator

A wind turbine, vector control technology, applied in the direction of motor generator control, vector control system, electronic commutation motor control, etc., can solve the problems of reduced system reliability, increased cost, increased maintenance cost, etc., to achieve anti-interference The effect of improving capacity and reducing cost

Inactive Publication Date: 2009-03-18
北京清能华福风电技术有限公司
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Problems solved by technology

[0003] However, the installation of speed and position sensors will bring some new problems to the double-fed asynchronous wind power generation system, such as reduced system reliability, increased cost, increased maintenance cost, etc.

Method used

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  • Non-position sensor vector control method for double-feed wind power generator
  • Non-position sensor vector control method for double-feed wind power generator
  • Non-position sensor vector control method for double-feed wind power generator

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Embodiment Construction

[0022] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0023] The doubly-fed generator is a nonlinear, strongly coupled, multivariable system, and its electromechanical energy conversion is accomplished through the fundamental magnetic field. Therefore, in order to simplify the mathematical model, usually only consider the effect of the air-gap fundamental magnetic field of the DFIG, and ignore the iron loss and ferromagnetic nonlinearity, the skin effect of the winding, and the temperature rise of the stator and rotor windings. Accordingly, in the synchronous rotating coordinate system, when both the stator and the rotor adopt the motor convention, the mathematical model of the doubly-fed generator is:

[0024] u → s = R s i → s ...

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Abstract

The invention provides a method for controlling without-position sensor vector of a doubly-fed wind generator, wherein the control method adopts closed loop algorithm on the basis of a model reference self-adaptive module to indentify the rotor position and the rotary speed of a double fed wind induction generator. The control of the without-position sensor vector is possible, the cost of a generator system is lowered, and the anti-interference ability is improved. Simultaneously, the control method also adopts a method for improving voltage module observation flux linkages to observe a stator flux linkage under a stator static coordinate and a rotor flux linkage under a rotor static coordinate, the method can solve the problems that flux linkage phases which are obtained through observing the flux linkage through adopting a high pass filtering method are advanced and the amplitude is reduced, and the flux linkage which is corresponding with true value phases and amplitude is obtained.

Description

technical field [0001] The invention relates to a vector control method of a doubly-fed wind power generator, in particular to a vector control method of a doubly-fed wind power generator under the condition of no position sensor, and belongs to the technical field of wind power generation. Background technique [0002] In recent years, variable speed constant frequency double-fed asynchronous wind power generation technology has been widely used. During the operation of the doubly-fed wind turbine system, accurate motor speed and position information is required. Therefore, high-resolution position and speed sensors are necessary. At present, most of the doubly-fed asynchronous wind turbines use the stator flux-oriented vector control technology with position sensors to realize the decoupling control of the active power and reactive power of the power generation system. [0003] However, the installation of speed and position sensors will bring some new problems to the do...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/00H02P21/18
Inventor 苑国锋郑艳文龚细秀
Owner 北京清能华福风电技术有限公司
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