Implementation of multi-sampling current control for grid-connected inverters using TI TMS320F28377x

Abstract

With the development of renewable energy sources, grid-connected inverters become more and more important in modern power system. Current control plays an important role in the grid-connected inverter control system. To deal with the resonance issues of the LCL filter in inverter, Firstly, inverter model and delay transfer function are established. based on it, multi-sampling technique is introduced proved to be a suitable solution to reduce the delay in traditional inverter control system. How to implement multi-sampling technique in inverter control with TI F28377x series MCU is discussed and a hotfix for F28377 crossing point detection of modulation and carrier wave is raised. Experimental results with output currents and resonance stability margin validate the implementation of multi-sampling current control for grid-connected inverters.