Shuda Dong

Analysis of the Characteristics of the New Converter Transformer Based on the Matrix Model

This paper presents a matrix model which is applied for analysis of the new converter transformer with its filters connected to the common winding of the transformer. Based on this matrix model, the effects of the filters on the characteristics of the transformer are analyzed. The results show that the short-circuit impedances of the transformer are nearly constant and almost symmetrical with or without filters. The new converter transformer cannot only greatly reduce the harmonics of the grid-side currents, grid-side voltages, and the load-side voltages, but also dramatically improve its operational parameters, for example: voltage, current, apparent power, and power factor. Simulation and experimental results verify the correctness of the theoretical analysis.

A New Phase Shifting Transformer for Multipulse Rectifiers

This paper presents a new phase shifting transformer which is applied in multipulse diode/SCR rectifiers. Comparison of operational characteristics of a conventional phase shifting transformer and the proposed transformer was studied. Results show that the new phase shifting transformer can not only reduce greatly the harmonics of the grid side currents, grid side voltages and the load side voltages, but also dramatically improve its operational parameters including voltage, current, apparent power, and power factor. Simulation results verify the correctness of the theoretical analysis.