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Analytic Calculation of Space Vector Modulation Harmonic Content for Multiphase Inverters with Single Frequency Output

Modulation of two-level multiphase voltage-source inverters (VSIs) provides an increased number of degrees of freedom when compared to three-phase inverters. Choosing a modulation scheme for an application is a critical task and should be evaluated carefully, especially in multiphase inverters. Calculation of performance indicators for the overall harmonic content, like the harmonic distortion factors (HDF) or total harmonic distortion (THD) of the output have already been presented in literature. This research presents analytic calculation of voltage harmonics generated by the standard space vector modulation schemes (continuous and discontinuous) for multiphase drives with an odd number of phases. Therefore complete knowledge of the output voltage spectrum is gained, which e.g. enables the analysis of frequency dependent loads. Moreover calculated voltage harmonics are linked to the well-established HDFs.