Harmonic Elimination in Multilevel Converters
نویسندگان
چکیده
A method is presented to compute the switching angles in a multilevel converter so as to produce the required fundamental voltage while at the same time not generate higher order harmonics. Using a fundamental switching scheme, previous work has shown that this is possible only for specific ranges of the modulation index. Here it is shown for a three DC source multilevel inverter that, by modifying the switching scheme, one can extend the range of modulation indices for which the switching angles exist to achieve the fundamental while eliminating the 5th and 7th harmonics. In contrast to numerical techniques, the approach here produces all possible solutions. Keywords–Multilevel Converters, Harmonic Elimination, Resultants, Symmetric Polynomials
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This paper presents a new method to find the optimum switching angles in voltage source multilevel converters in order to minimize specific higher order harmonics and decrease the total harmonic distortion (THD) of their output voltage waveform. The output voltage waveform of inverter can either be in the form of staircase or PWM. In order to increase the degrees of freedom and elimination of m...
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