Study On Speed Sensorless SVM-DTC System Of PMSM Best Electrical Engineering Projects

ABSTRACT:
A novel speed sensorless direct torque control system-SVM-DTC of permanent magnet synchronous motor (PMSM) based on SVM and MRAS is presented. In this paper the various components of the speed sensorless SVM-DTC and the principle of realization are discussed in detail. Finally the simulation results with the application of MATLAB/SIMULINK show that the speed identification algorithm is accurate and of robustness, moreover, the whole control system has good static and dynamic performances.
KEYWORDS:
1. Permanent magnet synchronous motor (PMSM)
2. Space Vector Modulation (SVM)
3. Direct torque control (DTC)
4. Model reference adaptive system (MRAS)
SOFTWARE: MATLAB/SIMULINK

BLOCK DIAGRAM:


Fig.1. Speed-sensor less SVM-DTC diagram.
EXPECTED SIMULATION RESULTS:


Fig.2 (a) Estimated speed curve Fig.2 (b) Actual speed curve

Fig.2 (c) Speed error curve Fig.2 (d) Torque response

Fig.2(e) A-phase stator current waveform Fig.3 (a) Estimated speed curve

Fig.3 (b) Actual speed curve Fig.3 (c) Speed error curve


Fig.3 (d) Torque response Fig.3 (e) A-phase stator current waveform
CONCLUSION:
In this paper, the speed sensorless SVM-DTC system based on SVM and MRAS is presented and the control system has a clear control principle and structure. Simulation results show that the speed identification algorithm can estimate accurately the real speed and has robustness to varying of stator resistor. Moreover the speed sensorless SVM-DTC system has good static and dynamic performance.

REFERENCES:
[1] Yen-Shin Lai, Jian-Ho Chen..A New Approach to Direct Torque Control of Induction Motor Drives for Constant Inverter Switching Frequency and Torque Ripple Reduction[J],IEEE Transactions on Energy Conversion,2001,16(3),220-227
[2] Liang yan, Li Yongdong. The state of art of sensor-less vector control of PMSM[J]. Electric Drive,2003,33(4):4-9
[3] Young Sam Kim, Sang Kyoon Kim,Young Ahn Kwon.MRAS Based Sensorless Control of Permanent Magnet Synchronous Motor[C]. SICE Annual Conference, Fukui, Japan, 2003:1632-1637
[4] Li Yongdong. AC motor digital control system [M]. Beijing: Machine Press,2002
[5] Li Su. Direct Torque Control of Induction Motor[M]. Beijing: Machine Press,1999

 

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