Control method of net-side rectifier of double-fed asynchronous wind power generator under unbalanced network voltage

A technology for wind turbines and grid voltage, which is applied in the directions of motor generator control, electronic commutation motor control, and generator control, can solve problems such as generator DC bus voltage pulsation, and achieve obvious effects, simple changes and easy implementation Effect

Inactive Publication Date: 2009-10-14
北京清能华福风电技术有限公司
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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems existing in the prior art, and to provide a control method for the grid-side rectifier of the doubly-fed asynchronous wind power generator under unbalanced power grid voltage, so as to suppress the doubly-fed asynchronous wind power generator caused by the unbalanced power grid voltage. The generator DC bus voltage pulsation problem

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  • Control method of net-side rectifier of double-fed asynchronous wind power generator under unbalanced network voltage
  • Control method of net-side rectifier of double-fed asynchronous wind power generator under unbalanced network voltage
  • Control method of net-side rectifier of double-fed asynchronous wind power generator under unbalanced network voltage

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[0030] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0031]According to the balance theory, the three-phase unbalanced variables of the grid can be decomposed into the sum of their positive sequence, negative sequence and zero sequence components. However, a doubly-fed asynchronous generator system with three-phase symmetry and mid-point isolation can be considered to have no zero-sequence component. Therefore, under the condition of balancing the grid voltage, only the positive and negative sequence components in the system current, voltage and flux linkage are considered. Choose an appropriate coordinate system so that the initial phase of the positive sequence component is 0, then the two-phase stationary coordinate system has:

[0032]

[0033] In the formula: F broadly represents voltage, current and flux linkage; The initial phase of the negative sequence component, the subscripts + and - corr...

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Abstract

A control method of a net-side rectifier of a double-fed asynchronous wind power generator designed by the invention can realize zero steady-state error tracking of zero frequency and frequency-doubled component in an input signal of a forward channel as well as the complete attenuation of zero frequency and frequency-doubled interference by changing a traditional PI adjustor to a PIR adjustor and setting a set frequency Omega[c] in the PIR adjustor to a double synchronous rotation angular speed Omega[s], thus relieving the influence caused by harmonic generated due to unbalanced network voltage. Only through the replacement of the adjustor, the method realizes the control over the net-side rectifier of the generator under the condition of unbalanced network voltage, is simple in modification and obvious in effect, does not relate to the design of complicated parts and is easy for implementation.

Description

technical field [0001] The invention relates to a control method for a grid-side rectifier of a doubly-fed asynchronous wind power generator, in particular to a doubly-fed asynchronous wind power generator grid-side rectifier capable of effectively suppressing the generator DC bus voltage pulsation caused by unbalanced grid voltage The control method belongs to the technical field of wind power generation. Background technique [0002] With the subsequent growth of energy demand, large-scale wind farms have been planned and constructed all over the world, and the single-unit capacity of wind turbines is also increasing rapidly. At present, the megawatt-level variable-speed constant-frequency double-fed asynchronous power generation system has been widely used in wind power generation, and has become the mainstream of wind power farms around the world. The double-fed asynchronous generator used in the variable-speed constant-frequency double-fed asynchronous power generation...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/00H02P21/00H02J3/38H02P21/14
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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