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Traction System with MRAS Sensorless Vector Control and PSM Technique

Purushottama Rao 1 and Y. S. Rao 2
1. Traction Engineering, Bharat Heavy Electricals Limited, Bangalore-560026, India
2. Electrical Department, IIT Roorkee, India

Abstract—With the advancement of control philosophies, induction motor emerged as traction motor precluding the DC series motor known for a long time for such an application. Due to stringent harmonic requirements of traction systems, the focus is to reduce the harmonics within a multi converter active front ends. For reliability and maintenance concerns, Sensor less speed control has become popular. The purpose of this article is to study the phase shifted modulation (PSM) technique for reduction of harmonics in multi converter front ends with unity power factor. Sensorless Speed estimation technique using MRAS along with the indirect vector control of traction motor is implemented. Reactive power based MRAS scheme is used for developing speed estimator which can eliminate the physical speed sensor. Performance of the overall system is observed.

Index Terms—active front end rectifier (AFEC), phase shifted modulation (PSM), model reference adaptive system (MRAS), popov’s hyper stability

Cite: Purushottama Rao and Y. S. Rao, "Traction System with MRAS Sensorless Vector Control and PSM Technique," International Journal of Electrical Energy, Vol. 2, No. 4, pp. 278-283, December 2014. doi: 10.12720/ijoee.2.4.278-283

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