FPGA based digital implementation of naturally sampled space vector modulation

Abstract

This paper demonstrates that oversampling improves the performance of digitally implemented space vector modulation. Using a field programmable gate array (FPGA) instead of a digital signal processor (DSP) or microcontroller allows the discrete algorithm to be executed in parallel instead of in series, increasing the algorithm speed considerably. As a result the reference signal can be sampled many times during any single switching period, converging on the performance of naturally sampled continuous signals. This paper shows experimental evidence that the phase delay of the output signal compared to the reference signal is significantly reduced by oversampling the reference signal. Additionally its gain with respect to the reference signal and its spectrum at low frequency are improved.