A Frequency Domain Method for Parameter Identification of Rotor-side Controller of Doubly-fed Wind Turbines

A doubly-fed wind turbine, parameter identification technology, applied in the direction of motor generator control, electronic commutation motor control, electromechanical brake control, etc., can solve problems such as impossible frequent operation

Inactive Publication Date: 2016-10-05
HOHAI UNIV +3
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Problems solved by technology

However, the time-domain identification method usually requires large disturbance experiments. Due to the characteristics of the power system itself, there is a certain risk in applying large disturbance excitations to the actual system, and it is impossible to operate frequently

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  • A Frequency Domain Method for Parameter Identification of Rotor-side Controller of Doubly-fed Wind Turbines
  • A Frequency Domain Method for Parameter Identification of Rotor-side Controller of Doubly-fed Wind Turbines
  • A Frequency Domain Method for Parameter Identification of Rotor-side Controller of Doubly-fed Wind Turbines

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Embodiment Construction

[0035] Below in conjunction with accompanying drawing and specific embodiment the technical solution of the present invention is described in further detail:

[0036] In this embodiment, a wind turbine based on a doubly-fed induction machine (DFIG for short) is directly connected to the grid, and the simulation system is as follows figure 1 shown. The simulation system is built in Matlab2012b software. All components in the system are taken from the wind farm example (Wind Farm (DFIG Phasor Model) Demo) that comes with Matlab, and the component parameters are all default values. Among them, β represents the pitch angle of the wind turbine blade, ω r represents the DFIG rotor speed, I r represents the current in the rotor winding, V dr , V qr Represent the d-axis and q-axis components of the rotor excitation voltage; V DC Represents the voltage of the DC side capacitor; V g and I g is the output voltage and current of the grid-side converter; V dg , V qg Represent the ...

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Abstract

The invention discloses a frequency domain method for parameter identification of a rotor side controller of a doubly-fed wind turbine. First, determine the rotor-side controller's d axis and q shaft decoupling model and parameters to be identified; then inject a pseudo-random signal into the reference signal of the rotor-side controller; and according to the synchronously collected input pseudo-random signal and the output rotor current d axis or q shaft component, calculate the self-power spectrum of the input signal and the cross-power spectrum of the input signal and the output signal, and obtain the frequency sequence of the transfer function of the rotor-side controller decoupling model; finally, identify the rotor based on the damped nonlinear least squares optimization method The parameters of the side controller. The invention identifies the parameters of the rotor side controller based on the decoupling model, and the test method is simple; a pseudo-random signal is superimposed on the input reference signal as an excitation, which can be carried out without affecting the normal operation of the doubly-fed wind turbine, and the test method is practical.

Description

technical field [0001] The invention relates to a frequency-domain method for parameter identification of a rotor-side controller of a doubly-fed wind turbine, belonging to the field of power system modeling. Background technique [0002] Since the introduction of wind power into the power system, the model of wind turbines, especially the dynamic model has been a research hotspot. The controller is an important part of the DFIG, and its control mode and model parameters have a great influence on the dynamic characteristics of the DFIG. Therefore, it is necessary to accurately model the controller of the DFIG. [0003] In the existing literature, when identifying the controller parameters of wind turbines, it is generally based on the original controller model with the rotor voltage as the output. However, the d-axis and q-axis variables in the original model are coupled. If the parameters are identified directly based on this model, The number of experiments is many and th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P21/14
Inventor 潘学萍鞠平吴峰金宇清张源杨晓梅黄俊辉王海潜谢珍建乔黎伟祁万春谈健赵宏大
Owner HOHAI UNIV
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