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Harmonic analysis of PWM multi-level converters

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1 Author(s)
Wong, K.T. ; ALSTOM T&D Power Electron. Syst. Ltd., Stafford, UK

The method of modulation based on a triangular carrier signal and a sinusoidal modulating signal has been widely used in Graetz bridges. This method is applied to multilevel converters where, with the chain-circuit converter as an example, there are two carriers per chain link. Each carrier is responsible for one output voltage pulse per half power-frequency cycle. The fundamental and harmonic components of the converter output voltage are calculated by a three-dimensional modulation model and the double Fourier series, without the need for iterative numerical techniques. The harmonics results are compared with those of a single-phase two-level converter with a high-frequency carrier. The harmonic performance of the chain-circuit converter is generally better. The extension of the method to more than one output voltage pulse per half power-frequency cycle per chain link is also discussed

Published in:

Electric Power Applications, IEE Proceedings -  (Volume:148 ,  Issue: 1 )