Abstract
An analytical evaluation method for output waveform quality of space vector pulse width modulation (PWM) strategies applied in neutral-point-clamped three-level converter (3L-NPC) is proposed in this paper. Low frequency error caused by neutral point voltage ripple and high frequency error introduced by space vector synthesis were both taken into account, and the unified error model of output current ripple was established. By taking continuous and discontinuous modulation strategies as examples, the unified error model was validated through Fourier analysis of the experimental results. The proposed evaluation method will be helpful for the switching sequence optimization and the modulation strategy selection.
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