Abstract
In this paper, a quasi-constant switching frequency zero voltage switching (ZVS) control strategy is proposed for three-phase grid-connected inverters. Full ZVS range can be achieved for all the switches at any load, modulation index, and power factor using discontinuous pulse width modulation (DPWM). No additional high- frequency sensor or auxiliary circuit is needed. The switching frequency is constant at steady-state. It does not change with the phase angle or the power factor, but it varies with the modulation index, grid RMS voltage and current. The frequency can be easily calculated in a digital controller based on current ripple prediction (CRP) instead of current zero-crossing detection (ZCD). The turn-on loss is eliminated so the inverter can operate at a high switching frequency, especially by using wide band-gap devices. The conversion efficiency, power density, cost, and dynamic response of the inverter can all be improved. A 3.3 kVA experimental prototype using SiC MOSFETs interfacing 400 V DC link with three-phase 110 V AC grid is developed to verify the effectiveness of the proposed control strategy.
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