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The harmonic contents of the output waveform of the power converters is a very important factor in electrical power quality. In this paper a five-level cascaded inverter with unequal DC sources is considered and a selective harmonic elimination technique at fundamental frequency, based on the graphical separation of functions zeros, is considered to reduce total harmonic distortion in the inverter...
Because of their numerous advantages including high voltage operations and limited harmonics content, multilevel inverters are often used in high power applications. However, dc sources supplying the inverter do not always have the same voltage, thus resulting voltage unbalances and performance deterioration. In order to solve such a problem, this paper proposes a modulation technique based on a harmonic...
A deterministic algorithm aiming at reduction of harmonic content in three phase, five-level cascaded inverters is proposed. The procedure starts from a non-linear system consisting of disequations and, using Chebyshev polynomials and Waring's formula, for any assigned modulation index computes those switching angles α1 and α2 reducing harmonics amplitude such as to fulfill grid code specifications...
A new procedure to mitigate some harmonics is presented for a 5-level cascaded inverter, varying the modulation index. The two switching angles α1 and α2 are computed by using a procedure based on graphycal analysis by using Chebyshev polynomials and the Waring's formulae. The proposed mitigation technique is applied to reduce a pair of harmonics among third, fifth and seventh in inverter output voltage...
This paper proposes a Selective Harmonic Elimination algorithm for multilevel power converters. Starting from an analysis of valid modulation index intervals, the algorithm computes those switching angles which eliminate the undesired harmonic. Differently by other approaches, it is based on the use of full analytical and numerical procedures, which can be easily executed in real-time. After a detailed...
Traditional methods, such as Modulating-Functios, Space-Vectors and Feedback Methods present the disadvantage of high residual harmonics. Selective Harmonic Elimination (SHE) generates trains of pulses such as the fundamental component of the resulting waveform has a specified frequency and amplitude while selected order harmonics are eliminated. To achieve this goal, a set of nonlinear equations...
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