Synchronous Optimal Modulation: Frequency or Time Domain, Global or Constrained Optimization? 40 Years to the First Formulation

Abstract

Alternative approaches to Total Harmonic Distortion (THD) minimization comprise frequency or time domain THD calculations and global or constrained optimization problem formulation. Time domain constrained optimization formulation suggested in 1977 that seems most adequate from computational efficiency and robustness does not attract sufficient attention it deserves from the modern researchers. Time domain current THD / harmonic loss constrained optimization is illustrated by single-phase inverter examples. New results on multilevel THD optimization for variable voltage levels are presented.