Power quality has become an important concern to both electric utilities and
end users due to the increased use of non-linear loads in modem power systems
over the past decade. Nonlinear loads inject harmonics into the power system and
thus may lead to poor power quality and lower power factor. Current and voltage
harmonics can adversely affect the operation of sensitive devices.
A common remedial solution to reduce the effects of harmonic distortion in
a power system is filtering. Passive and active filters are two common types of
harmonic filters. An active filter, in general, is a controllable current source that
injects current at the same magnitude and opposite phase to that of the harmonic
current. For this thesis work, a DSP-controlled active filter to cancel lower order
(5th, 7th, 11th, and 13th) harmonics in a three-phase, three-wire power system is
designed. The proposed active filter employs a series LC tank tuned to a high
frequency, along with a pulse-width modulated (PWM) converter topology. The
PWM control of the active filter is implemented in a TMS320F240 DSP. The DSP
implementation enhances the performance of the filter in real-time and enables the
filter to compensate for varying loads. Additionally, the use of DSP-control reduces
the number of components and therefore reduces the cost and improves the
reliability of the overall system. The uniqueness of the filter is in its ability to
control each harmonic separately. A laboratory prototype of the proposed active
filter has been built and tested to verify the performance of the active filter. / Graduation date: 2001
| Identifer | oai:union.ndltd.org:ORGSU/oai:ir.library.oregonstate.edu:1957/32518 |
| Date | 01 December 2000 |
| Creators | ��nsal, Abdurrahman |
| Contributors | von Jouanne, Annette R. |
| Source Sets | Oregon State University |
| Language | en_US |
| Detected Language | English |
| Type | Thesis/Dissertation |
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