Design and development of high frequency power transformer for 5 kilowatts renewable energy inverter system
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Date
2005
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Abstract
Energy generation through renewable sources has recently gained higher concern
throughout all around the globe. However, some sort of converters system has to be
employed in order for the generated power to suit the existing loads. One of the main parts
within the converters is the high frequency power transformer. This thesis presents the
most important initial design consideration on how to build a more reliable high frequency
transformer for high power application. A pilot project of 5kW high frequency power
transformer fabrications had been accomplished in order to validate the design
methodology. Within an operating frequency of 25kHz, a MnZn P type material core has
been utilized. Two sets of E-E geometry cores had been stacked in order to achieve the
required WAAc volume. The ratio of 2: 39 turns of primary to secondary has been installed
to step-up the 28V input from solar panels up to 400V output. An interleaved 0.2mm foil
winding has been implemented in both primary and secondary sides to overcome the Eddy
current loss while increasing the fill factor of the transformer. A whole DC-AC inverter
system has been built as well in order to operate and validate the fabricated transformer.
Experiments and testing showed that the transformer can was extremely compacted,
overall transformer efficiency has able to reach 94%, while the overall output of the system
succeeded to remain below 3% in THO.
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Keywords
Development of high frequency power , 5 kilowatts renewable , Inverter system