Abstract
PWM inverter induction motor drives with capacitive DC links are becoming more common. Using circuit analysis, physical measurement and numerical simulation, the paper investigates the generation of power-system harmonics by the PWM drive. It is shown that its harmonic characteristics differ from other nonlinear power-system loads and the drive can be more accurately represented as a voltage rather than a current type of harmonic source. This has implications for both analytic harmonic evaluation and practical filter design. In the paper, a modulation function model is developed which can be used to assess the impact of a PWM drive on a power system, when only limited design data are available.
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