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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...
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...
An inductor-capacitor-inductor (LCL) filter are widely adapted in grid-connected inverter applications. In this paper, the harmonic attenuations of the LCL filter are quantitatively analyzed, and then the design optimization of two inductance values, which are related on a cost and a size, is illustrated. Based on the design optimization, the LCL filter employing a symmetric geometry is proposed....
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