Complete mathematical analysis of ripple current as a function of the modulation index for direct indirect and bus clamped space vector modulation techniques [motor drives]

A detailed mathematical analysis was performed to estimate the current ripple as a function of modulation index for direct indirect and bus clamped methods of space vector modulation. The results, both experimental and simulated, show that for a modulation index above 0.45 the direct-indirect method progressively gives lesser current ripple and becomes almost half at around a modulation index of 1. For an intelligent drive, with the optimizing criterion as current ripple, this helps in dynamically switching between bus clamped and direct-indirect methods.