Investigation of Induction Motor Drive Performance under Various Current Controllers

摘要

A current controller is used in high performance ac drives to switch the voltage source inverter in such a way that the motor currents follow a set of reference current waveforms. This paper presents 1) a short review of the different current control techniques for three phase two level inverters 2) a detailed comparison of various current controller schemes, particularly hysteresis (fixed, sinusoidal, and mixed-band), ramp comparator and hybrid current controllers for the induction motor drive based on performance at different speeds. The hysteresis and the ramp comparator controllers are getting more attention due to their simplicity and high dynamic responses. Therefore, the hybrid current controller is used. The harmonic spectra of the motor line currents for various current controllers are obtained using a fast Fourier transform for comparison purposes. All current control schemes have been verified by using computer simulations.