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This paper presents a novel, simple and robust AC voltage sensorless predictive control method for the active front end (AFE) rectifiers. The proposed sensorless control is based on computing the input AC voltage from the instantaneous active and reactive powers using the input AC currents, DC link voltage, and the switching state. The proposed sensorless predictive control has suitable results even...
Direct torque control (DTC) is a well-known method for ac induction motor (IM) drive systems. This approach is based on estimating stator flux and torque. So, accurate flux estimation is one of the fundamental key components of DTC drives. In this paper, an improved stator flux estimation technique based on the voltage model with stator flux and stator current errors as feedbacks is introduced. The...
The stator flux estimation is the framework of direct torque control technique (DTC) method. The accurate estimated flux grantees the desirable sensorless drive function. There are different methods for flux estimation that the voltage model is simplest ones. These methods are sensitive to the stator resistance; therefore have poor performance and incorrect estimated flux at very low speed. In this...
In this paper a novel two-step prediction Finite Control Set Model Predictive Control (FCS-MPC) strategy with weighting factor look up table and divided control interval is presented. The method can be applied for a two-level inverter because of its low torque ripple. The weighting factor in cost function is selected via a look up table which is based on torque ripple minimization. Two-step prediction...
A robust sliding mode prediction model is combined with sliding mode voltage model observer to achieve sensorless PTC (predictive torque control) method, in this paper. Closed loop sliding mode voltage model observer is proposed to compensate the effect of stator and rotor resistances uncertainties. A novel closed loop prediction model is developed to reduce the effect of the errors which are injected...
This paper proposes a control algorithm to compensate current harmonics and reactive power simultaneously in series active power filters combined with passive shunt filters. Imposing load current to have the same level of distortion as the source voltage for harmonics compensation and to its phase for reactive power compensation is performed. Approximately unity power factor can be attained without...
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