Title :
Probabilistic voltage harmonic analysis of direct torque controlled induction motor drives
Author :
Kaboli, S. ; Vahdati-Khajeh, E. ; Zolghadri, Mohammad Reza
Author_Institution :
Sch. of Electr. Eng., Sharif Univ. of Technol., Tehran, Iran
fDate :
7/1/2006 12:00:00 AM
Abstract :
In high frequency motor-drives such as direct torque controlled (DTC) induction motor drives, the motor harmonic loss, and electromagnetic interference are largely affected by the spectrum of the motor input voltage. Nonlinear elements in the control loop of DTC drive make harmonic analysis of the drive very complex compared to classical pulsewidth modulated controlled drives. In this paper, a probabilistic method to study the harmonic contents of voltage in DTC of induction motors is presented. The DTC voltage chain is simulated with a random process. Then, the autocorrelation function of voltage vectors is calculated and its power spectrum density is obtained. The effect of flux and torque hysteresis controller bands, machine parameters, and inverter dc-link voltage on the motor voltage spectrum is investigated. Major harmonics in the DTC voltage spectrum are specified and their behaviors are described. Simulation and experimental results are presented to justify the theoretical analysis.
Keywords :
electromagnetic interference; harmonic analysis; induction motor drives; invertors; machine control; probability; torque control; autocorrelation function; direct torque controlled induction motor drives; electromagnetic interference; harmonic analysis; inverter dc link voltage; motor harmonic loss; motor voltage spectrum; power spectrum density; probabilistic method; probabilistic voltage harmonic analysis; Electromagnetic interference; Frequency; Harmonic analysis; Hysteresis motors; Induction motor drives; Induction motors; Magnetic losses; Space vector pulse width modulation; Torque control; Voltage control; Autocorrelation function; direct torque control (DTC); induction motor drive; power spectral density; random process; voltage harmonics;
Journal_Title :
Power Electronics, IEEE Transactions on
DOI :
10.1109/TPEL.2006.876838