Investigations on Energy Efficient Sensor less Induction Motor Drive

 ABSTRACT:

In this paper a high performance induction motor drive without speed sensor is investigated. The rotor flux oriented indirect vector control scheme is used for obtaining high performance. In order to eliminate the speed sensor, a MRAS based speed estimator is designed for gathering the rotor speed information. Also a simple but effective loss minimization algorithm is integrated to calculate the optimal flux for efficiency improvement of the drive. Complete simulation model is

developed in Simulink/MATLAB software. The performance of the developed system I analyzed with different operating conditions.

KEYWORDS:

1.Field oriented control,

2.induction motor,

3.sensorless,

4.loss minimization algorithm

SOFTWARE: MATLAB/SIMULINK

BLOCK DIAGRAM:

 Fig. 1. Block diagram of sensor less IFOC induction motor drive

                           

Fig. 2. Block diagram of rotor flux based MRAS speed estimator

 EXPECTED SIMULATION RESULTS:

                                          

        

Fig. 3. Speed, speed error and flux response with  constant (rated) flux    

                                                                 

 Fig. 4. Speed, speed error and flux response with optimal flux                                                                      

              

Fig. 5. Low speed tracking response of the  drive with constant (rated) flux     

                                                      

Fig. 6. Low speed tracking response of the drive  with optimal flux

                                                                     

Fig. 7. Drive response with step load torque  with constant flux mode                                     

                                                     

  Fig. 8. Drive response with step load torque with optimal flux mode

CONCLUSION:

In this paper, developed model of sensor less induction motor drive in Simulink/MATLAB software is investigated. Speed estimator is also developed using rotor flux based MRAS technique for sensor less operation. For efficiency improvement particularly under partial loads a model based loss minimization technique is applied. The drive performance is investigated for constant flux and the optimal flux. Drive shows good performance with the optimal flux under various operating conditions

 REFERENCES:

[1] E. Poirier, M. Ghribi and A. Kaddouri, “Loss Minimization Control of Induction Motor Drives Based on Genetic Algorithms”, IEEE Int. Conf. on Electric Machines and Drives, pp. 475–478, 2001.

[2] B. Kumar, ; Y. K Chauhan and V. Shrivastava, “Performance analysis of induction motor drive with optimal rotor flux for energy efficient operation”, IEEE Int. Conf. on Advanced Communication Control and Computing Technologies (ICACCCT), pp. 319 – 322, 2014.

[3] A.V. Ravi Teja,; C. Chakraborty; S. Maiti and Y. Hori, “A New Model Reference Adaptive Controller for Four Quadrant Vector Controlled Induction Motor Drives”, IEEE Transactions on Industrial Electronics, Vol. 59 , No. 10, pp. 3757 –

[4] B. Kumar, ; Y. K Chauhan and V. Shrivastava, “Assessment of a fuzzy logic based MRAS observer used in a Photovoltaic array supplied AC drive”, Frontiers in Energy, Vol. 8, No.1, pp. 81-89, 2014.

[5] S.M. Gadoue; D. Giaouris and J.W.Finch, “MRAS Sensor less Vector Control of an Induction Motor Using New Sliding-Mode and Fuzzy- Logic Adaptation Mechanisms”, IEEE Transactions on Energy Conversion, Vol. 25 , No. 2, pp. 394 – 402, 2010. 3767, 2012.