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EFFECTIVE HARMONIC MITIGATION TECHNIQUES USING WAVELETS BASED ANALYSIS

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Author(s): R.KAMESWARA RAO | G.RAVI KUMAR | S.S.TULASI RAM

Journal: International Journal of Engineering Science and Technology
ISSN 0975-5462

Volume: 3;
Issue: 8;
Start page: 6571;
Date: 2011;
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Keywords: THD | SHEPWM | PWM | OMTHD | OHSW

ABSTRACT
The harmonic currents are generated by single phase nonlinear loads. The mirror surplus harmonic elimination method is used mostly because of its less computation. The Selective Harmonic Elimination PulseWidth Modulation (SHEPWM) based methods can provide theoretically the highest quality output among all the PWM methods. In this paper SHEPWM model of a multilevel series connected voltage source inverter is developed which can be used for an arbitrary number of levels and switching angles. This paper describes the analysis of harmonic elimination methods with wavelet transform method. For the analysis of harmonic components Wavelet bior6.8 version is used. The harmonics must be reduced in order to reduce the size of the filters. Selective harmonic elimination method totally eliminates a particularly selectedharmonic either of lower order or higher order, there by Total Current Harmonic Distortion (THD) can be reduced to a large extent.
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