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Method for identifying parameters of controllers of DFIG (doubly-fed induction generator)

A generator controller and doubly-fed induction technology, applied in the direction of motor generator control, electronic commutation motor control, and generator control, can solve the problems of parameter identifiability, difficult to popularize and use, and achieve the elimination of parameter identification accuracy. Effect

Active Publication Date: 2014-04-02
HOHAI UNIV
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Problems solved by technology

As for the controller of the converter, a typical model contains five proportional integral controllers (PI controllers), and there is a cascading situation between the inner and outer loop PI controllers, the conventional identification method using external disturbances will encounter Parameter identifiability problem
If the controller circuit can be modified with the cooperation of the WTG manufacturer to lead out the input and output terminals of each PI controller, then the parameters of the PI controller can be identified one by one, but this method is only available with the cooperation of the manufacturer can only be implemented, it is difficult to promote the use of

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  • Method for identifying parameters of controllers of DFIG (doubly-fed induction generator)
  • Method for identifying parameters of controllers of DFIG (doubly-fed induction generator)

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Embodiment Construction

[0030] Below in conjunction with accompanying drawing, a kind of doubly-fed induction generator controller parameter identification method proposed by the present invention is described in detail:

[0031] Such as figure 1 The schematic diagram of the structure of the DFIG wind turbine shown in the figure, the V wind stands for wind speed, T m Represents the mechanical power output by the wind turbine, β represents the pitch angle of the wind turbine blades, T sh Represents the mechanical power output by the transmission system to the DFIG rotor, ω r represents the DFIG rotor speed, i r represents the current in the rotor winding, i r called the rotor current, v r Represents the rotor excitation voltage, V DC Represents the voltage of the DC side capacitor, V DC_ref is the artificially set DC side capacitor voltage target value, v g and i g are the output voltage and current of the grid-side converter, v s and i s Represents the voltage and current of the DFIG stato...

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Abstract

The invention provides a method for identifying parameters of controllers of a DFIG (doubly-fed induction generator). According to a signal transfer relation among all controllers of a DFIG converter, disturbance is applied to a measurement signal for the input end of each controller through a step identification method to highlight the action of each controller under the disturbance of the measurement signal, so that the parameters of each controller are identified. The disturbance is applied to the measurement signal for the subsequent controller of two cascaded controllers, and meanwhile, the change of the measurement signal for the previous controller is shielded to decouple the parameters of the two controllers, so that the parameters of each PI (proportional-integral) controller can be individually identified under the condition that a controller circuit is not transformed. Through repeated iterative identification methods, the problem of low parameter identification accuracy is solved.

Description

technical field [0001] The invention belongs to the technical field of motor control, in particular to a parameter identification method for a doubly-fed induction generator controller. Background technique [0002] Wind power generation with remarkable randomness and intermittent characteristics has become an important power source for some power systems. For these power grids, in order to formulate a reasonable planning and construction plan and reliable operation control measures, it is necessary to have an accurate wind power model to simulate and analyze the power grid. The Wind Turbine Generator (WTG) model and parameters in the existing simulation software are mainly from individual WTG manufacturers with strong technical strength. However, there are many brands and models of WTG installed in the actual power grid, and most manufacturers do not provide accurate models and parameters due to insufficient testing technology or intellectual property protection. The mode...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P21/14
Inventor 金宇清鞠平刘伟航潘学萍吴峰秦川
Owner HOHAI UNIV