Analysis of the RMS current stress on the DC link capacitors of the four phase 3-level T-type voltage source converter

In the three phase four wire applications, three phases and neutral, often the loads are not well balanced; hence there is a flow of current through neutral conductor. In these applications, the voltage source converters have to handle return or neutral currents into the DC link. This paper presents analysis of the RMS current stress on the DC link capacitors of the four leg 3L T-type voltage source converter caused by unbalanced loads.