Conference Paper

A New Scheme to Direct Torque Control of Interior Permanent Magnet Synchronous Machine Drives for Constant Inverter Switching Frequency and Low Torque Ripple

Sch. of Electr. Eng. & Telecommun., New South Wales Univ., Sydney, NSW
DOI: 10.1109/IPEMC.2006.4778323 Conference: Power Electronics and Motion Control Conference, 2006. IPEMC 2006. CES/IEEE 5th International, Volume: 3
Source: IEEE Xplore


This paper presents a new direct torque control (DTC) scheme based on space vector modulation (SVM) for interior permanent magnet synchronous machine (IPMSM) drives. The new scheme provides a variable option for the improvement of DTC controlled IPMSM. Closed-loop control of both torque and flux is developed with two proportional-integral (PI) controllers. The stator voltage is generator through SVM unit. The torque and flux ripples are greatly reduced with fixed inverter switching frequency comparing with classical switching-table based DTC scheme. The analysis of the control principle provides a guide to design the controller parameters. Modeling results confirm the effectiveness of the proposed scheme

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    • "In order to get an excellent performance, many modifications of the basic switching table, hysteresis comparator and flux estimator of the conventional DTC (similar techniques those used in induction machine) have been proposed during last decade, as listed as follows: 1. Using new switching table -Subdividing voltage vector [13] [14] [15] -Variety of structure switching table [13] [16] [17] -PWM (Pulse Width Modulation) [18] -SVM (Space Vector Modulation) [19] [20] [21] 2. Modification of structure of inverter: -Three level inverter [22] -Matrix converter [21] [23] [24] 3. Modification of hysteresis controller -Direct Reactive Energy and Torque (DRET) control method [25] -Reference Flux Vector Calculator (RFVC) [17] -Variable Structure Control (VSC) [26] [27] Due to some modification of the DTC techniques for PMSM above, the verification of the proposed methods had been simulated using Tole Sutikno, et al. MATLAB/Simulink. "
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    ABSTRACT: Direct Torque Control (DTC) has gained popularity for development of advanced motor control due to its simplicity and offers fast instantaneous torque and flux controls. However, the conventional DTC which is based on hysteresis controller has major drawbacks, namely high torque ripple and variable inverter switching frequency. This paper presents an improved switching strategy for reducing flux and torque ripples in DTC of PMSM drives; wherein the torque hysteresis controller and the look-up table used in the conventional DTC are replaced with a constant frequency torque controller (CFTC) and an optimized look-up table, respectively. It can be shown that a constant switching frequency is established due to the use of the CFTC while the reduction of torque and flux ripples is achieved mainly because of the selection of optimized voltage vector (i.e. with an optimized look-up table). This paper also will explain the construction of DTC schemes implemented using MATLAB-Simulink blocks. Simulation results were shown that a significant reduction of flux and torque ripples which is about 90% can be achieved through the proposed DTC scheme.
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    ABSTRACT: Four-switch three-phase inverter (FSTPI) is usually adopted as the topology for continuous fault-tolerant operation of a direct torque (DTC) system when inverter fault occurs. Due to that the FSTPI can only provide four voltage space vectors with unequal amplitude, the DTC system performance will deteriorate to a certain extent. To enhance the performance of permanent magnet synchronous motor (PMSM) drive fed by FSTPI, a sliding mode controller with the analysis and design of the controller included is proposed for the purpose of direct control the torque and stator flux linkage in this paper. Besides a nonlinear perpendicular flux observer is adopted to estimate the stator flux more accurately as well. The effectiveness of the proposed methods have been verified by simulation study, in which the torque and flux ripples have been significantly minimized and the inherent merits of fast dynamic responses of the conventional direct torque control are preserved.
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