Analysis and DSP Implementation of Multi-sampled Three-Phase Current Controllers

This paper presents a method for current control of three-phase systems, realized using the multi-sampled pulse-width modulator (MS-PWM). The feedback signal is highly oversampled and filtered to obtain its average value with high noise suppression. Independently, the control update rate is chosen to be higher than double the switching frequency, which reduces delays due to calculation and digital modulation. In this way, the proposed strategy offers improved dynamic response compared to standard double-update PWM, while offering a high quality feedback signal, robust to noise sampling and aliasing. The analysis is verified using a standard digital signal processor TI f28379d and a Typhoon HIL 402 hardware-in-the-loop system that emulates an electric drive with a high-speed BLDC motor.