Thesis-1996-Fraser.pdf (5.25 MB)
Power factor-corrected transformerless three-phase PWM converter for UPS applications
thesis
posted on 2018-05-17, 15:20 authored by Malcolm E. FraserThis thesis describes the research of a new transformerless three phase PWM converter
for uninterruptible power supplies (UPS) applications. The removal of the bulky three
phase transformer in larger power UPS can provide a significant saving in weight and
cost of the overall system.
The converter consists of a new four-wire rectifier coupled with a four-wire inverter via
a dc bus. The supply and load neutral may be connected together without any neutral
current flowing into the utility regardless of the load on the inverter. This allows the load
to be at the same potential as the utility.
The rectifier, inverter and complete UPS and control system are described in detail and
simulation results are used extensively to back up the theory. An experimental prototype
of the four-wire rectifier provides further confirmation of the principles.
A further proposal to digitize the system is given. This would reduce the size of the
required control circuit and simplify the hardware requirements.
Funding
Engineering and Physical Science Research Council. Emerson Electric U.K. Ltd.
History
School
- Mechanical, Electrical and Manufacturing Engineering
Publisher
© Malcolm E. FraserPublisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Publication date
1996Notes
A Doctoral Thesis. Submitted in partial fulfilment of the requirements for the award of Doctor of Philosophy at Loughborough University.Language
- en