Predictive direct torque control for the pm- synchronous machine

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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“…It can be demonstrated that V sd and V sq can be expressed as functions of inverter leg states by using a rotation matrix (3). 2 …”

Section: Modelsmentioning

confidence: 97%

“…The development of high performance controls for AC-machine drives has motivated considerable attention in recent years. Many studies are reported for current controls [1][2][3].…”

Section: Introductionmentioning

confidence: 96%

Predictive Current Control for an Induction Motor

Rétif

Lin-Shi²,

Morel

2008

2008 IEEE Power Electronics Specialists Conference

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“…So the state vector at the end of the current modulation period (X.k C 1/) has to be estimated according to the last control vector ( .k/) with Eqs. (10) and (12).…”

Section: Real-time Implementationmentioning

confidence: 98%

“…In [12], a so-called direct-mean-torque control is presented. It applies a voltage to the machine for the time required to reach the border of a calculated ripple band.…”

Section: Introductionmentioning

confidence: 99%

A New Direct Current Control for a Permanent Magnet Synchronous Machine

Lin-Shi

Morel

Rétif

et al. 2008

Electric Power Components and Systems

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In this article, a new direct current control (DCC) is presented. Currents directly control the torque in a permanent magnet synchronous machine (PMSM). As with conventional direct-torque control (DTC), the control variable of the proposed DCC is directly the inverter switching state, so similar fast torque dynamics are obtained. However, hysteresis controllers and switching tables are not used here. Based on a simplified state-space model of a PMSM, including the inverter switching states, the proposed control scheme selects a set of three configurations and calculates their respective application times in order to obtain the desired state vector with a fixed switching frequency. The design of the proposed controller is fully discussed. Comparative studies with DTC are performed on a 1.6-kW PMSM drive with a digital signal processor (DSP) system. Experimental results prove the superior performances of the proposed control.

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“…Many efforts have been made to relieve this problem. Direct mean torque control (Mutschler & Flach, 1998;Pacas & Weber, 2005), bandconstrained technique (Ambrozic, Buja, & Menis, 2004), variable-structure DTC (Lascu, Boldea, & Blaabjerg, 2004) and DTC with space vector modulation (Kyo-Beum, Blaabjerg, & Tae-Woong, 2007;Habetler, Profumo, Pastorelli, & Tolbert, 1991) have proven to be valuable solutions. All of these methods can reduce the torque ripple, but at the cost of either a higher switching frequency or increased complexity of the system.…”

Section: Introductionmentioning

confidence: 99%

Model predictive torque control with an extended prediction horizon for electrical drive systems

Wang

Zhang

Kennel

et al. 2014

International Journal of Control

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This paper presents a model predictive torque control method for electrical drive systems. A two-step prediction horizon is achieved by considering the reduction of the torque ripples. The electromagnetic torque and the stator flux error between predicted values and the references, and an over-current protection are considered in the cost function design. The best voltage vector is selected by minimising the value of the cost function, which aims to achieve a low torque ripple in two intervals. The study is carried out experimentally. The results show that the proposed method achieves good performance in both steady and transient states.

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Predictive direct torque control for the pm- synchronous machine

Cited by 54 publications

References 3 publications

Predictive Current Control for an Induction Motor

Predictive Current Control for an Induction Motor

A New Direct Current Control for a Permanent Magnet Synchronous Machine

Model predictive torque control with an extended prediction horizon for electrical drive systems

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