Predictive Current Control for an Induction Motor

Abstract

This paper presents a Predictive Current Control (PCC) strategy applied to an Induction Motor (IM) drive. In contrast to conventional vector control, where the inverter is not taken into account by the controller, the PCC considers the state of the inverter as a discrete control variable. Based on a simplified state space model of the IM and the inverter, the proposed control scheme calculates the state vector evolution direction in the d-and q-reference frame for all possible switching states of the inverter. The switching state which minimizes a given cost function is selected and is applied during an adapted duration which is calculated for each computation cycle. As the control requires the knowledge of the instantaneous rotor fluxes and in order to improve the control robustness, a reduced-order extended high gain observer is proposed for estimation of rotor fluxes and inverse rotor time constant. The simulation results validate the observer. The controller is implemented on a 5.5kW IM drive with a Digital-Signal-Processor (DSP) on a DSpace1103 board. Experimental results show the effectiveness and the performances of the proposed control.

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“…In [6] the next controller function was used: The voltage vector u s com (k) calculated with (28) is applied to the minimize stator current regulation error at (k+1). Equation ( 23) is based on (11) with addition of correction part D Is :…”

“…In the FOC system instead of linear PI current controllers, predictive current controllers may be used. The current control algorithm previously presented [6] was modified by using the observer system instead of simple load model .With such approach, better results were recorded. To avoid the system complication for the PCC, the back EMF calculation was integrated to flux and speed observer for FOC IM drive.…”

Two-vector Dimensionless Model Predictive Control of PMSM Drives Based on Fuzzy Decision Making

“…Based on the control variables, the most common MPCs are the model predictive torque & flux control (MPTC), which uses the torque and flux as the control variables, and the model predictive current control (MPCC), which uses the stator currents as the control variables [13]- [14]. They predict their future behaviors and select an optimum switching vector by minimizing their cost functions based on their control variables [15]. The conventional MPCs apply the vector chosen for the whole control cycle, which is inadequate to regulate the torque and may result in an unsatisfactory steady-state performance [16].…”

Power Factor Correction for Three Phase Induction Motor Drive System

“…The non-isolated drive system employs a non-isolated PFC of the boost converter as input to the PWM inverter as proposed in [9][10][11]. Steady-state performance of a three-phase, medium-power ac motor operated from a single-phase ac source using a diode bridge rectifier, with boost converter has been discussed in references [12][13][14][15].…”