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Optimal hybrid modulation of the 5LANPC converter

A hybrid modulation approach is proposed in this work, which allows to modulate the switches of the five level neutral point clamped inverter (5LANPC) with different switching frequencies. Some of the switches are controlled with a low switching frequency using six-step modulation and Optimized Pulse Patterns (OPPs), whereas the rest are modulated with a high switching frequency using Carrier-Based Pulse Width Modulation (CB-PWM). Consequently it is sufficient to replace only the latter with SiC technology, whereas the former can stay in conventional Si technology. Furthermore, a pulse pattern optimization method is presented that maximizes the performance of the hybrid modulation regarding the achievable current Total Harmonic Distortion (THD) and the voltage ripple of the flying capacitor.