Brushless doubly-fed generator system and control method thereof

Abstract

The invention discloses a brushless doubly-fed generator system and a control method thereof, and belongs to the technical field of brushless doubly-fed induction generator control. The system comprises a topology module and a control module, wherein the topology module comprises a brushless doubly-fed generator, a two-quadrant converter, a direct-current bus capacitor and a three-phase uncontrolled rectifier bridge. The alternating current side of the three-phase uncontrolled rectifier bridge is connected with the power winding; the direct-current side of the two-quadrant converter and the direct-current side of the three-phase uncontrolled rectifier bridge are connected with the direct-current bus capacitor in parallel. The control method comprises the following steps: providing excitingcurrent according to a PWM pulse modulation signal; controlling the AC voltage output by the power winding side according to the exciting current, and converting the AC voltage into DC voltage through a three-phase uncontrolled rectifier bridge; and inputting the direct-current voltage into the DC / DC converter or the alternating-current grid-connected inverter to supply power to a load or operatein parallel with a power grid. The problem that when an existing brushless doubly-fed generator system is connected to a grid, the power winding voltage, the power grid voltage and the alternating-current side voltage of a grid-side converter are difficult to synchronize is solved.

Description

technical field [0001] The invention belongs to the technical field of brushless doubly-fed induction generator control, and more specifically relates to a brushless doubly-fed generator system and a control method thereof. Background technique [0002] The brushless doubly-fed generator is a new type of dual electrical port motor, which includes two sets of stator windings that are independent of each other and have different pole pairs, namely the power winding (Power Winding, referred to as PW) and the control winding (Control Winding, referred to as CW). , the indirect coupling between the two sets of stator windings is realized through the rotor. It cancels the brush slip ring device, and has the characteristics of long service life, low maintenance cost and reliable operation. Since the brushless doubly-fed generator operates in doubly-fed mode, the power converter only needs to provide slip power to the rotor of the generator, so the required capacity of the power co...

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Problems solved by technology

[0006] Aiming at the defects of the prior art, the object of the present invention is to provide a brushless doubly-fed generator system and its control method, aiming to solve the problem of power winding voltage, power grid It is difficult to synchronize the voltage and the AC side voltage of the grid-side converter

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