Abstract
A novel carrier-based PWM (CBPWM) strategy is proposed in this paper for a three-level T-type neutral-point-clamped (3L-TNPC) inverter in electric propulsion applications. For a civil aircraft, the performance during the cruising stage, which is usually the longest in the typical mission profile with lower-rated output power, relies on high-efficiency electric propulsion. Meanwhile, its high reliability is realized on the premise of balanced neutral-point (NP) voltage. To leverage the above advantages at the same time, in this paper, by adopting the reconstructed modulation signals, not only can the NP voltage ripple be mitigated, but also the switching losses are reduced effectively. Furthermore, the active capacitor voltage balancing capability can be achieved by injecting adaptive zero-sequence voltage (ZSV) in specific intervals of pulse trains. The results of simulation and experimental test validate the effectiveness and feasibility of the presented modulation algorithm for electric aircraft propulsion applications.
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