DocumentCode :
3316756
Title :
FPGA based high precision torque and flux estimator of direct torque control drives
Author :
Sutikno, Tole ; Idris, Nik Rumzi Nik ; Jidin, Aiman Zakwan ; Daud, Mohd Zaki
Author_Institution :
Dept. of Energy Conversion, Univ. Teknol. Malaysia (UTM), Skudai, Malaysia
fYear :
2011
fDate :
18-19 April 2011
Firstpage :
122
Lastpage :
127
Abstract :
This paper presents an improved FPGA-based torque and stator flux estimators for direct torque control (DTC) induction motor drives, which permit very fast calculations. The improvements are performed by 1) using two´s complement fixed-point format approach to minimize calculation errors and the hardware resources usage in all operations, 2) calculating the discrete integration operation of stator flux using backward Euler approach, 3) modifying the non-restoring method to calculate complicated square root operation of stator flux, 4) introducing a new sector judgment method, and 5) reducing the sampling frequency down to 5μs. To avoid saturation due to DC offset present in the sensed currents, the LP Filter is applied. The simulation results of DTC model in MATLAB/Simulink, which performed double-precision calculations, are used as references to digital computations executed in FPGA implementation. The Hardware-in-the-loop (HIL) method is used to verify the minimal error between MATLAB/Simulink simulation and the experimental results, and thus the well functionality of the implemented estimators.
Keywords :
field programmable gate arrays; induction motor drives; stators; torque control; DTC model; Euler approach; FPGA implementation; LP filter; MATLAB/Simulink; direct torque control drives; hardware-in-the-loop method; high precision torque; induction motor drives; nonrestoring method; square root operation; stator flux estimators; Estimation; Field programmable gate arrays; Hardware; MATLAB; Mathematical model; Stators; Torque;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Applied Power Electronics Colloquium (IAPEC), 2011 IEEE
Conference_Location :
Johor Bahru
Print_ISBN :
978-1-4577-0007-1
Type :
conf
DOI :
10.1109/IAPEC.2011.5779871
Filename :
5779871
Link To Document :
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