Parameter-free prediction current control method for independent brushless doubly-fed induction generator

Abstract

The invention discloses a parameter-free prediction current control method of an independent brushless doubly-fed induction generator, and belongs to the technical field of brushless doubly-fed induction generator control. The method comprises the following steps: monitoring control winding voltage and current information of a motor at the first two moments and the current moment in real time; calculating a prediction current containing delay compensation, determining an optimal switching state of a power electronic device in a control winding side converter through a cost function, and finally determining a duty ratio by using a single vector modulation algorithm to generate a reasonable and effective switching sequence so as to drive the control winding side converter to realize real-time control of a control winding current. According to the control method, the winding current is predicted and controlled through the real-time motor state information, dependence on motor parameters can be effectively avoided, a control system is hardly influenced by motor parameter changes, robustness is high, and operation is more stable.

Description

technical field [0001] The invention belongs to the technical field of brushless doubly-fed induction generator control, and more specifically relates to a parameter-free predictive current control method of an independent brushless doubly-fed induction generator. Background technique [0002] The brushless double-fed induction generator is a new type of AC induction motor, which contains two sets of stator windings with different numbers of pole pairs. The rotor is specially designed so that the rotating magnetic fields with different numbers of pole pairs generated by the two sets of stator windings can indirectly interact with each other. function to achieve energy transfer. The two sets of stator windings of the brushless doubly-fed motor are called the power winding and the control winding respectively. Compared with the brushed doubly-fed induction generator, it cancels the brushes and slip rings, and has the advantages of simple structure and high reliability. [000...

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Problems solved by technology

[0006] In view of the above defects or improvement needs of the prior art, the present invention provides a parameterless predictive current control method of an independent brushless doubly-fed induction generator, and its purpose is to solve the model predictive control of the traditional independent brushless doubly-fed induction generator method, relying too much on model quality and motor parameters, resulting in technical problems of low reliability of system operation

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