This paper proposes a technique for improving the input-output current quality in inverter system using small capacitor. The small dc-
link capacitor in three-level inverter
has advantages such as cost, volume, life-time, and reliability compared to the
capacitor. The small capacitors, however,
cannot compensate for the difference in input-output power, resulting in
current quality. In addition, the ripple
of the neutral-point voltage generated using three-level NPC inverter degrade
the output current
quality. Therefore, in order to solve
these problems the proposed method is implemented by applying two techniques.
additional circuit is applied to improve
the input current. Second, the neutral voltage ripple reduction technique is
applied to improve
the output current. The effectiveness of
the proposed techniques are verified by simulation and experimental results.
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