Doubly-fed induction generator parameter identification method

Abstract

The invention discloses a Doubly-Fed Induction Generator (DFIG) parameter identification method, and belongs to the field of power system modeling. The DFIG parameter identification method comprises the following steps: firstly, determining an analytical expression of stator dq axis short circuit current under a condition of three-phase metal short circuit of a port of a doubly-fed induction generator, and determining parameters to be identified according to the analytical expression; building a single-machine infinite bus system of a doubly-fed wind turbine generator set based on a Matlab/Simulink platform, setting the three-phase metal short circuit at the port of the doubly-fed induction generator, and simulating to obtain a disturbed trajectory of the stator dq axis short circuit current; analyzing the identifiability of each parameter to be identified and the complexity for parameter identification by adopting a trace sensitivity method; and finally, identifying all the parameters to be identified by adopting a particle swarm optimization algorithm, and determining parameter identification values according to multiple identification results. Compared with a method based on active power and reactive power, the doubly-fed induction generator parameter identification method for DFIG parameter identification based on the stator dq axis short circuit current has the advantage that the influence caused by the current transformer control procedure is low; and the parameter identification values are determined according to the multiple parameter identification results, so that the problem of large errors possibly caused by single identification is avoided.

Description

technical field [0001] The invention belongs to the field of power system modeling, in particular to a parameter identification method of a doubly-fed induction generator. Background technique [0002] Modeling is the basis of power system calculation, analysis and operation control. Reasonable and accurate wind turbine model parameters are particularly important for the correctness of the simulation analysis of electromagnetic transients and electromechanical transients in power systems. How to obtain wind turbine model parameters that are closer to reality is a research hotspot in power academia and industry. [0003] When identifying the DFIG parameters of the doubly-fed induction generator, the parameter identification is generally based on the disturbed trajectories of the active power and reactive power of the wind turbine under the port voltage drop. However, due to the strong dynamic coupling between the dynamics of the converter control link and DFIG, the dynamics ...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to propose a new parameter identification method based on the short-circuit current of the stator dq axis as the observation quantity in view of the current problem that the identification accuracy of DFIG parameters is affected by the control link of the converter

The parameter identification method of the doubly-fed induction generator proposed by the present invention performs parameter identification based on the stator dq-axis short-circuit current; the present invention also obtains parameter identification values ​​based on multiple identification results, avoiding the problem of large errors that may be caused by a single identification

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