Switching Losses And Harmonic Investigations In Multi-Level Inverter

Switching Losses And Harmonic Investigations In Multi-Level Inverter
Author(s):
S.Sri Matha, P.Thirumala
Keywords:
Harmonics, Multilevel inverters, Pulse width modulation, Switching losses, Total harmonic distortion.
Abstract
Use of conventional two-level pulse width modulation (PWM) inverters provide less distorted current and voltage but at the cost of higher switching losses due to high switching frequencies. Multilevel inverters are emerging as a viable alternative for high power, medium voltage applications. This paper compares total harmonic distortion and switching losses in conventional two-level inverters with multilevel inverters (three-level and five-level) at different switching frequencies. An optimized switching frequency has been obtained for a lower level of total harmonic distortion and switching losses. Diode-clamped, three-phase topology is considered for study. A sinusoidal PWM technique is used to control the switches of the inverter. Simulation study confirms the reduction in harmonic distortion and switching losses as the number of the levels increases.
Article Details
Unique Paper ID: 144695 Publication Volume & Issue: Volume 4, Issue 2 Page(s): 172 - 178
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