Abstract
In this paper, a novel switching scheme using discontinuous pulse-width modulation (DPWM) for a zero-voltage switching (ZVS) grid-connected three-phase inverter is proposed. ZVS in the main and auxiliary switches was achieved. Moreover, the reverse recovery currents of the anti-parallel diodes in the main switches were suppressed. A circuit analysis was performed, and a simulation was carried out. Furthermore, a prototype of the ZVS grid-connected three-phase inverter was constructed to verify the effectiveness of the proposed PWM control scheme. Both the simulation and experimental results verified the validity of the proposed PWM control scheme.
Highlights
Three-phase inverters are widely utilized in PV systems, wind power generation, electrical vehicles, and uninterruptible power systems, etc
Speaking, according to the clamp capacitor location, the clamp capacitor can be in series with resonant inductance [1,2] or in series with the auxiliary switch [3,4,5,6,7] to achieve zero-voltage switching (ZVS)
If the clamp capacitor is in series with the auxiliary switch, the reverse recovery current of the anti-parallel diodes can be suppressed, but the switch voltage stress is high
Summary
Three-phase inverters are widely utilized in PV systems, wind power generation, electrical vehicles, and uninterruptible power systems, etc. In order to reduce the switching loss, in this paper, a carrier-based ZVS DPWM (CB-DPWM) control strategy was studied for grid-connected three-phase inverters. A simple saw-tooth carrier waveform with positive and negative slope rates was developed to achieve ZVS in both the main and auxiliary switches. Using this method, the auxiliary switch, S7, control signal can be generated more compared with the literature [1,2]. Based on the proposed ZVS DPWM control strategy, simulation and experimental results are offered in Section 4 to verify the validity of the proposed control strategy for a ZVS grid-connected three-phase six-switch inverter.
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