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This paper presents a sensorless algorithm for the vector control of doubly-fed induction Machine (DFIM) using rotor current based model reference adaptive system (MRAS) observer. The stator flux oriented vector control is employed to achieve variable-speed drive and decoupled active/reactive power control. In the proposed MRAS observer, the reference model is the measured rotor current, which compared...
A sensorless control system for a surface mounted permanent magnet (PM) machine is developed which uses measurement of motor current derivative during the fundamental PWM vector excitation only. Vector extension is required when the vector width falls below a minimum time duration. The extension is made to allow the high frequency switching oscillations due to parasitic capacitances in the drive to...
The implementation of the phase locked loop (PLL) structured observer in high frequency signal injection schemes requires tuning of the PI controller to lock on the rotor position. The PI controller is tuned depending on the signal to noise ratio (SNR) which is related to the amount of saliency/anisotropy presented in the machine, the amplitude and phase of the incoming modulated carrier signal. Thus,...
Similar to other sensorless control methods based on signal injection, the resulting signal of the transient voltage excitation is influenced, for example, by the slotting saliency, the anisotropy saliency, as well as by the saturation based saliency and its load and flux dependencies. A separation algorithm to extract the slotting saliency and saturation saliency from the resulting signal is presented...
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