Fast steady state solution of adjustable speed drives for harmonic assessment

This contribution provides comprehensive development procedures and mathematical models of an adjustable speed drive (ASD) for steady-state solutions. A complete representation of the ASD is employed, which includes the detailed models of the diode rectifier and of the inverter. The power electronic switches are efficiently represented through a smooth function that allows a larger integration step to be used without loss of precision in the solution. An efficient technique in the time domain for the computation of the periodic steady-state solution of electric systems including ASDs based on a discrete exponential matrix (DEE) and the Poincaré map is used. Simulation results are compared with the data obtained in an experimental prototype.