Space Vector Based PWM Algorithms to Reduce Current Ripple for an Induction Motor Drive

ABSTRACT Conventional space vector pulse width modulation employs conventional switching sequence, which divides the zero vector time equally between the two zero states in every sub cycle .Existing bus-clamping PWM techniques employ clamping sequences, which use only one zero state in a sub cycle. In the present work a new set of Bus clamping pulse width modulation (BCPWM) dealing with a special type of switching sequences, termed as "double-switching clamping sequences", which use only one zero state and an active vector repeats twice in a sub cycle, will be proposed. It is shown analytically that the proposed BCPWM techniques result in reduced harmonic distortion in the line currents over CSVPWM as well as existing BCPWM techniques at high modulation indices for given a average switching frequency. Simulation is done on v/f controlled Induction Motor drive in MATLAB/SIMULINK environment. To validate the proposed method, simulation results are presented and discussed