| Abstract |
This paper proposes a power decoupling control method based on a discontinuous current mode fora T-type NPC inverter. In general, additional components such as buffer capacitors and inductors arerequired in order to provide a power decoupling circuit to inverters. These components lead an increasein circuit volume and weight. In the proposed current control method, the power decoupling capabilityis achieved without any additional components. Furthermore, the grid-tied inductor, which is connectedto the output side, is minimized because the discontinuous current mode (DCM) is used for the currentcontrol. As a simulation result, the second order harmonic component of the input current is reduced by90.2\% compared to that without power decoupling control. Then, the proposed power decouplingcontrol is confirmed with a T-type NPC inverter as a prototype. Consequently, the second orderharmonic component of the input current is reduced by 77.1\% compared to that without powerdecoupling control, whereas the output current THD is 3.13\% at 200-W load. |
