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The nine-switch converter (NSC) has been used in power quality conditioners and AC motor drives. However, it has not attracted much attention because of its amplitude, frequency and phase-shift limitations primarily due to the constraint on the modulation index of the converter. To satisfy the modulation constraint and correctly synthesize the desired voltages, 'appropriate' DC offsets must be added to the phase voltage commands. This study proposes space vector (SV) and carrier-based (CB) modulation schemes for the NSC that enable the realization of the converter full capacity. The mathematical formulation of the SV and CB pulsed-width modulation schemes are supported by MATLAB/Simulink simulations and validated with experimental results.

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