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Parameter identification method of doubly-fed wind power generator

A wind power generator and parameter identification technology, which is applied to the control of generators, motor generator control, generator control circuits, etc., can solve the problems of increased processing costs, increased processing data volume, and slow processing speed, etc., to achieve enhanced The effect of identifying accuracy and improving system accuracy

Active Publication Date: 2019-07-30
中达安股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem existing in the existing technology is that with the identification of double-fed asynchronous wind turbines, the amount of identification data is increasing, which greatly increases the amount of processed data, making the processing speed slower or the processing cost increased

Method used

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  • Parameter identification method of doubly-fed wind power generator
  • Parameter identification method of doubly-fed wind power generator
  • Parameter identification method of doubly-fed wind power generator

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Embodiment Construction

[0032] Below in conjunction with accompanying drawing and embodiment the present invention will be further described:

[0033] The doubly-fed wind turbine is a complex time-varying system. The system output at each time node is not only related to the current input and output, but also related to the historical input and output. The system can be described as:

[0034]

[0035] Among them, {u(k),y(k)} is the measurement input and output sequence, a 1 ,...,a na ,b 1 ,...,b nb is the system parameter to be identified, a na >b nb .

[0036] The standard form of a typical least squares method is:

[0037] Y (N)= Φ (N) n (N) +E (N) (2);

[0038] When Φ T (N) Φ (N) When nonsingular, find the minimum:

[0039]

[0040] But for the doubly-fed wind turbine system model, when adding a set of data [u (N+1) ,y (N+1) ] T hour,

[0041] in,

[0042] Similarly, if the data is reduced by one row [u (1) ,y (1) ] T hour,

[0043]

[0044] In the present inv...

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Abstract

The invention discloses a parameter identification method of a doubly-fed wind power generator, and relates to the field of wind power generation. The parameter identification method comprises the steps of firstly, determining a to-be-identified parameter; secondly, continuously acquiring running data of a doubly-fed wind power generator model at interval, and building a to-be-identified samplingmatrix; thirdly, solving a rough identification vector according to a first solution formula; taking the rough identification vector as a to-be-identified vector of a (N+1)th item in response to sampling items of the running data less than or equal to M; fourthly, solving a fine identification vector according to a second solution formulae in response to the sampling item of the running data larger than M, and taking the fine identification vector as a to-be-identified vector of the (N+1) item; and sending the to-be-identified vector to a doubly-fed wind power generator controller. Previous data is eliminated, so that the calculation processing quantity becomes less; and meanwhile, since a parameter identification system is a gradual-changing system, the father from the current time node,the lower the data accuracy is, the data at the current moment is removed, and the system accuracy is effectively improved.

Description

technical field [0001] The invention relates to the field of wind power generation, in particular to a method for identifying parameters of a doubly-fed wind power generator. Background technique [0002] The doubly-fed asynchronous wind turbine is similar in structure to the wound asynchronous motor, because both the stator and the rotor can feed in or feed out energy, and the definition of "doubly-fed" comes from this. Since the double-fed generator is provided with AC excitation by the rotor, the double-fed generator is also called an AC excitation synchronous generator or an asynchronous synchronous generator. [0003] Double-fed speed regulation is to connect the stator winding of the double-fed motor to the commercial frequency power supply, and the rotor winding to connect to a variable frequency power supply whose frequency, amplitude, phase and phase sequence can be adjusted. When the doubly-fed motor is running in a steady state, the rotating magnetic field of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P9/00H02P21/14G06F17/16H02P101/15H02P103/10
CPCG06F17/16H02P9/007H02P21/14H02P2101/15H02P2103/10
Inventor 林家威吴生清乐起亮
Owner 中达安股份有限公司
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