Performance characterization of vector sigma-delta modulation

The paper derives the idea of vector sigma-delta modulation (SDM) based on distortion minimization premises. It gives basic characterization of this modulation, along with comparisons with alternative SDM structures and space-vector PWM. The results obtained thus far show that the vector SDM definitely outperforms the other SDMs, while also providing an interesting alternative to the PWM, particularly for higher modulation indices. A DSP implementation of a vector SDM is also discussed, and sample test results are provided obtained in a simple inverter-fed induction motor drive.