Abstract
The Multilevel Inverter topology gives the advantages of usage in high power and high voltage application with reduced harmonic distortion without a transformer. This paper presents a comparative study of orientation of higher ordered harmonics with increase in switching frequency around the frequency modulation index of nine level diode clamped inverter for different Switching frequency Multicarrier Pulse width Modulation.
Highlights
Multilevel Pulse Width Modulation (PWM) inverters have been gained importance in high performance power applications without requiring high ratings on individual devices, as static var compensators, drives and active power filters
Lowest order harmonic elimination is possible by proper choice of the number of pulses per half cycle
The merits and demerits of this PWM technique for different frequencies are compared under comparable circuit conditions on the basis of factors like (i) quality of output voltage (ii) obtainable magnitude of output voltage (iii) ease of control (iv) reduction in total harmonic distortion etc
Summary
Multilevel Pulse Width Modulation (PWM) inverters have been gained importance in high performance power applications without requiring high ratings on individual devices, as static var compensators, drives and active power filters. A multilevel inverter divides the dc rail directly or indirectly, so that the output of the leg can be more than two discrete levels. As both amplitude modulation and pulse width modulation are used in this, the quality of the output waveform gets improved with low distortion. The advantages of multilevel inverter are good power quality, low switching losses, reduced output dv / dt and high voltage capability. The PWM schemes of multilevel inverters are classified in to two types the multicarrier sub-harmonic PWM (MCSHPWM) and the Multicarrier switching frequency optimal pulse width modulation (MC-SFOPWM) [4], [5].
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