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Three-level Neutral-Point-Clamped inverter has inherent problem which is the neutral-point voltage fluctuation caused by the neutral-point current that flows into or out from the neutral-point. Even though the neutral point voltage is balanced with certain method, the oscillation of neutral point voltage is still remains due to the output phase current. If total capacitance of DC-link capacitor is...
A high efficiency bidirectional dc-dc converter is proposed for energy storage systems. In the proposed bidirectional converter, a simple auxiliary circuit has been applied to provide soft switching at both modes of operation. By added a resonant cell, the converter can realize zero-voltage-transition (ZVT) where both the switch and the rectifier diode achieve soft condition without increasing their...
The propose of this paper is to present the systematic processes of constructing the averaged small-signal model of the three-phase grid-connected three-level neutral-point-clamped inverter with a LCL filter and to design the control system for the grid current by using the model. The systematic processes are composed of the averaging, perturbing and linearizing step about the circuit equations. In...
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