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This paper presents a novel isolated cascaded half-bridge converter for medium voltage battery energy storage systems with three phase legs of series connected modules in star connection. Each module consists of a grid-side half-bridge, a battery-side full-bridge and a medium-frequency transformer providing isolation. The presented modulation ensures grid-side zero-current-switching (ZCS) and battery-side...
This paper presents an isolated three-phase bidirectional AC-DC converter with a novel modulation strategy that enables Zero-Voltage-Switching (ZVS) for all switches over the whole AC line period. The AC-DC converter allows the direct coupling of a three-phase AC system with a DC port applying a single high-frequency transformer. A novel modelling approach for the power flows and the derivation of...
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