Transformerless Single-Phase Universal Active Filter with UPS Features and Reduced Number of Electronic Power Switches W. R. N. Santos, E. M. Fernandes, E. R. C. da Silva, C. B. Jacobina, A. C. Oliveira and P. M. Santos Federal University of Piau´ı - UFPI Federal University of Campina Grande - UFCG Federal University of Maranh˜ao - UFMA-BRASIL
Abstract- This paper presents an universal active power
filter for harmonic and reactive power compensation
with UPS (Uninterrupted Power Supplies) features. The
configurations does not use transformer in the series part.
Transformerless modern UPS systems have been rapidly
replacing the old technology due to their performance and
size attributes. Reducing the numbers of passive elements
and/or switches in active power filters and UPS topologies
not only reduces the cost of the whole system but also
provides some advantages, such as great compactness,
smaller weight, and higher reliability. However, the cost
reduction requires the use of more complex control strategies.
The model of the proposed system is derived and
it is observed that the system can be reconfigurable to
operate with four or three-leg depending on the issue. A
complete control system, including the PWM (Pulse-Width
Modulation) techniques, is developed and a comparison
between the proposed filter and the standard one is done,
as well. Simulated and experimental results validate the
theoretical considerations.
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