A New Rotor Position Observer of Brushless Doubly-Fed Induction Generators Based on Control-Winding High-Frequency Signal Injection

In this paper, the main target is to propose a novel detection methodology for sensorless position observer with the injection approach of high-frequency signal (HFS) for voltage regulation of the brushless doubly-fed induction generators (BDFIGs). The new suggested observer relies on the injection of HFS into the control winding (CW) side, (CW-HFS), while the resulted induced signal detected from the power winding (PW) side can be processed for observing the position signal of generator. The proposed new sensorless control method neither need any saliencies in the rotor side nor require any process for computing the flux, which can assure the superiority of the new algorithm. Comprehensive analysis is realized with a BDFIG of wound-rotor type. The effective observation of the novel algorithm for detecting the mechanical position of BDFIGs has been confirmed through the obtained results with a better dynamic performance under various states of operation.