Analysis of Performance of the Induction Motor under Hysteresis Current Controlled DTC Best Electrical Engineering Projects

ABSTRACT:

The direct torque control method is a powerful control technique for specially induction motor drive due its fast dynamic torque response. It originates in the fact that torque and flux is directly controlled by instantaneous space voltage vector unlike. Field Oriented Control (FOC) and smooth control of drives are being utilized to perform real time simulation on the ac motor variables, such as electromagnetic torque, fluxes, mechanical speed, etc. For the reason, direct torque control gradually has been used in the field requiring fast response since its introduction in the mid-1980. Even though the direct torque control has several problems. These problems are: (I) low switching frequency and variation in speed; (2) the increase of the torque ripple in the low speed region; (3) the short control period (25 /ls) for the good performance. To solve the problems of Direct Torque Control, several studies were carried out. This paper improves one of the drawbacks of Direct Torque Control with the Hysteresis direct torque control. In some papers to avoid these problems 2 level inverter with induction motor has been used but it is very complicated and didn’t show large improvement. In this paper, Hysteresis direct torque control method with 3 level inverter has been implemented and its effectiveness is compared with conventional direct torque control with 2 level inverter by using Matlab/Simulink.

KEYWORDS:

  1. Direct Torque Control
  2. Hysteresis Direct Torque Control
  3. Two Level Inverter
  4. Three Level Inverter.

SOFTWARE: MATLAB/SIMULINK

BLOCK DIAGRAM:

Basic DTC Scheme

Induction Motor Hysteresis Current Controlled DTC

SIMULINK BLOCK DIAGRAM:

Simulink model of the direct torque controlled induction motor with Conventional DTC.

Induction Motor Hysteresis Current Controlled DTC

Simulated two level phase voltage s of Inverter with Conventional DTC and Simulated output wave form of the Id, Iq currents Drawns from Induction motor with conventional DTC

Induction Motor Hysteresis Current Controlled DTC

Fig.5. Simulated output wave form of the Reference and Simulated output wave form of the and actual speeds of the Induction Reference and actual Torque of the motor with conventional DTC Induction motor with conventional DTC

Induction Motor Hysteresis Current Controlled DTC

Simulated XY plot wave form of .Simulated phase voltages of inverter with flux current with conventional DTC. Hysteresis current controlled DTC

Induction Motor Hysteresis Current Controlled DTC

Simulated XY plot wave form of flux current with Hysteresis current controlled DTC

Induction Motor Hysteresis Current Controlled DTC

CONCLUSION:

In the present work initially the modeling and simulation of a three phase three level synchronous link converter using hysteresis controller and adaptive hysteresis controller is presented. The hysteresis controller for the 3 level converters is designed and developed in the Simulink model. The modeling, simulation of a direct torque and direct flux control of an induction motor fed from a three phase three level inverter is presented in this paper. The effectiveness of the proposed 3 level inverter fed induction motor drive controlled with hysteresis current controlled DTC is compared with 2 level inverter fed induction motor drive with conventional DTC and it is observed in simulation results the improvement in low speed operation performance of induction motor for high power three level inverter applications.

REFERENCES:

[I] Rakesh Kantaria and S.K.Joshi “A review on power quality problems and solutions” Power electronics National Conference November 2008.

[2]IEEE Std. 1159 – 1995, “Recommended Practice for Monitoringn Electric Power Quality.

[3]Yan Li, Chengxiong Mao, Buhan Zhang, Jie Zeng, “Voltage Sag Study for a Practical Industrial Distribution Network”, 2006 International Conference on Power System Technology, pp.I-4, Oct., 2006.

[4]Understanding FACTS: Concepts and Technology of Flexible AC Transmission Systems. Narain G. Hingorani, Laszlo Gyugyi. Wiley IEEE press.

[5] J. G. Nielsen, M. Newman, H. Nielsen, and F. Blaabjerg, “Control and testing of a dynamic voltage restorer (DVR) at medium voltage level,”iEEE Trans. Power Electron., vol. 19, no. 3,p.806,May 2004

 

 

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