In this research work, the performance of a C-type, 2nd harmonic power filter is
optimized by the use of a thyristor switched damping resistor. In the design of
conventional C-type, 2nd harmonic filters / the resistance of permanently connected
damping resistor is to be optimized for minimization of voltage stresses on filter
elements arising from switchings in transient state and for maximization of filtering
effectiveness in the steady-state. Transformer inrush current during energization of
power transformers and connection of filter bank to the supply are the major causes
of voltage stresses arising on filter elements in transient state. These can be
minimized by designing a highly damped C-type filter (low damping resistor) at the
expense of inadequate filtering performance and high losses in the steady-state. On
the other hand, higher damping resistance (high quality factor) is to be chosen in the
design of C-type filter for satisfactory filtering of 2nd harmonic current component at
the expense of higher voltage rating for capacitor bank and hence a more costly filter
bank design. This drawback of conventional C-type 2nd harmonic filter circuit can be eliminated by subdividing damping resistor into two parallel parts / one is
permanently connected while the other is connected to and disconnected from the
circuit by back-to-back connected thyristor assemblies. The use of light triggered
thyristors provides isolation between power stage and control circuit, and hence
allows outdoor installation.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12608836/index.pdf |
| Date | 01 September 2007 |
| Creators | Gercek, Cem Ozgur |
| Contributors | Ertas, Arif |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | To liberate the content for public access |
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