Brushless doubly-fed induction generator efficiency optimization control method and system

Abstract

The invention discloses a brushless doubly-fed induction generator efficiency optimization control method and system, and belongs to the technical field of brushless doubly-fed induction generator control. The method comprises the steps of (1) in a current control period, calculating output power according to a power winding voltage amplitude feedback value and a resistive load value, calculating direct-current input power according to the direct-current bus voltage and the direct-current bus current, and calculating mechanical power converted into input electromagnetic power according to the rotor angular speed and the electromagnetic torque so as to calculate motor efficiency eta of the current control period; (2) if eta is greater than the current optimal motor efficiency, updating the optimal power generation efficiency to eta, updating the optimal power generation frequency to the current power generation frequency f, and then updating a control winding angular frequency given value; and (3) after the power generation frequency is increased by delta f, if the power generation frequency does not exceed the upper limit of the power generation frequency, turning to the step (1) to start efficiency optimization of the next control period, and otherwise, enabling the generator to operate according to the sequence, and ending the optimization control. According to the invention, the motor efficiency can be maximized.

Description

technical field

[0001] The invention belongs to the technical field of brushless doubly-fed induction generator control, and more specifically relates to an efficiency optimization control method and system for a doubly-fed induction generator without double-feed. Background technique

[0002] Brushless double-fed induction generator (Brushless doubly-fed induction generator, BDFIG), as a new type of AC induction motor, cancels the brushes and slip rings. Compared with the brushless doubly-fed induction generator, not only the operation reliability Significantly improved, and basically maintenance-free, has a good application prospect.

[0003] The brushless doubly-fed induction generator contains two sets of stator windings with different pole pairs, which are called power windings (Power Windings, PW) and control windings (Control Windings, CW). The rotor windings are specially designed to make the power windings and The rotating magnetic fields generated by the control w...

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