Multilevel inverter

摘要

The present disclosure proposes an input power of each unit power cell of a cascaded H-bridge inverter that is mutually insulated. To this end, the present disclosure includes a phase shift transformer configured to output a voltage of predetermined phase by receiving an AC input power having a fixed frequency, and a plurality of unit power cells serially-connected configured to output a voltage having a predetermined phase by receiving a voltage provided by the phase shift transformer, wherein the phase shift transformer is configured to include the number of phase shifts corresponding to the number of the plurality of unit power cells.

主权项

1. A multilevel inverter, the multilevel inverter comprising:
a phase shift transformer configured to output a first voltage of predetermined phase by receiving AC input power having a fixed frequency; a plurality of serially-connected unit power cells configured to output a second voltage having a predetermined phase by receiving the first voltage from the phase shift transformer; and a master controller configured to exchange data with a unit power cell controller included in each of the plurality of serially-connected unit power cells, wherein the phase shift transformer is configured to include a number of phase shifts corresponding to a number of the plurality of serially-connected unit power cells, wherein an operation basic format for each of the plurality of serially-connected unit power cells is transmitted from the master controller to the corresponding unit power cell controller via optical communication, the operation basic format including an output voltage command and a synchronous signal, and wherein information is transmitted from each unit power cell controller to the master controller, the information indicating at least an over-voltage, an under-voltage, an arm short-circuit, a ground, an open fuse, a heat sink overheat, abnormal hardware, an open phase of an output of the corresponding unit power cell or an open phase of an input of the corresponding unit power cell.