Abstract:
This paper introduces a single-stage soft-switched high-frequency-link three-phase dc-ac converter. The topology supports unidirectional dc-to-ac power flow for grid integration of photovoltaic sources, fuel cells, etc. High-frequency magnetic isolation reduces system volume, weight, and cost. DC-side converters use sine-wave pulsewidth modulation. High-frequency switched dc-side converter is soft switched for most of the line cycle. Line-frequency switched ac-side converter active switches have low switching loss. Ac-side converter line frequency switching allows slow semiconductor devices to generate high voltage ac output. This paper presents a cascaded multilevel structure for direct medium-voltage AC grid integration. This paper analyzes circuits with transformer leakage and switch capacitances. Building a 6-kW three-phase laboratory prototype. The simulation and experimental results validate the proposed topologies.
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