MODEL OF DIRECT CONTROL OF THE TORQUE OF THE ASYNCHRONOUS MOTOR IN MATLAB
Keywords:
Asynchronous electric drive, direct control system, inverter, switching frequency, speed control-ler, observer.Abstract
The article discusses the relevance, the principle of operation and the reasons for the emergence of direct torque control (DTC) systems of an induction motor. The authors carried out a study of the mathematical model of direct torque control of an induction motor in MATLAB, and identified the main disadvantages. The main task, on the solution of which the operation of the direct torque control system depends, is the identification of the stator flux linkage. This is solved by integration, which leads to the accumulation of errors. The source of errors is the inaccuracy of determining the active resistance of the stator and its change during the operation of the induction motor. There is a disadvantage in the DTC system associated with the appearance of minor torque ripples and rotor speed fluctuations at low loads.
References
ABB. DTC (2015). A motor control technique for all seasons. Retrieved from https://new.abb.com/drives/dtc.
Rupert Gouws (2014). Efficiency analysis of an induction motor with direct torque and flux control at a hot rolling mill. Paper presented at the Industrial & Commercial Use of Energy Conference (ICUE), 3,111–115.
Azhan Ab Rahman (2010). Simulation on Simulink AC4 Model (200hp DTC Induction Motor Drive) using Fuzzy Logic Controller. International Conference on Computer Applications and Industrial Electronics (ICCAIE 2010), 553–557.
MathWorks. Help Center (2018). AC4 - DTC Induction 200 HP Motor Drive. MathWorks. Help Center. Retrieved from https://la.mathworks.com/help/physmod/sps/ug/ac4-dtc-induction-200-hp-motor-drive.html.
H.F. Abdul Wahab and H. Sanusi (2008). Simulink Model of Direct Torque Control of Induction Machine. American Journal of Applied Sciences, 5, 1083–1090.
Pivnyak G.G and Volkov A.V. (2006). Suchasni chastotno-rehulovani asynkhronni elektropryvody z shyrotno-im-pulsnoiu moduliatsiieiu. Monohrafiia [Modern frequency-regulated asynchronous electric drives with pulse-width modulation. Monograph], Dnipro, NMU, 470.
