Waveform distortion caused by high power adjustable speed drives - Part I: High computational efficiency models

Waveform distortion caused by high power adjustable speed drives is considered and two high computational efficiency models are proposed. Both models are essentially based on the switching function theory and on a new simplified control system representation. The first refers to the solution based on the Line Commutated Inverters the second to the case of the Pulse Width Modulated Inverters. Models' accuracy and computational efficiency are demonstrated. In a companion paper, the proposed models are applied inside a simulation procedure for the probabilistic analysis of waveform distortion on both the supply and motor sides of the two types of Adjustable Speed Drives here considered.