Multilevel converter based intelligent universal transformer
AssigneeElectric Power Research Institute, Inc.
InventorsJih-Sheng Lai, Arshad Mansoor, Arindam Maitra, Frank Goodman
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Abstract
A multilevel converter-based, intelligent, universal transformer includes back-to-back, interconnected, multi-level converters coupled to a switched inverter circuit via a high-frequency transformer. The input of the universal transformer can be coupled to a high-voltage distribution system and the output of the universal transformer can be coupled to low-voltage applications. The universal transformer is smaller in size than conventional copper-and-iron based transformers, yet provides enhanced power quality performance and increased functionality.
Claims16
A power conversion device, comprising:
- a multilevel converter configurable to convert an input waveform having a first frequency into a second waveform having a second frequency, wherein the second frequency is higher than the first frequency;
- a transformer coupled to the multilevel converter and configurable to transform the second waveform from a first voltage level to a second voltage level, wherein the first voltage level is higher than the second voltage level;
- and
- a switched inverter circuit coupled to the transformer and configurable to convert the transformed, second waveform into a third waveform for use with a power application.
A method of converting power, comprising:
- converting an input waveform having a first frequency into a second waveform having a second frequency, wherein the second frequency is higher than the first frequency;
- transforming the second waveform from a first voltage level to a second voltage level, wherein the first voltage level is higher than the second voltage level;
- and
- converting the transformed, second waveform into a third waveform for use with a power application.
Dependencies are inferred from the claim text.