An Improved Harmonic Injection Pulse Width Modulation Variable Frequency Triangular Carrier Scheme for Multilevel Inverters

Mohammad Sadegh Orfi Yeganeh, Mohammad Sarvi, Frede Blaabjerg, Pooya Davari

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Abstrakt

This paper proposes an optimized controllable PWM scheme suitable for multilevel inverters (MLIs). Seeing the
need for improving the output voltage characteristics such as THD, low order harmonic (LOH) and distortion factor (DF), an
improved harmonic injection pulse PWM variable frequency triangular carrier (IHIPWM-VFTC) modulation technique is
employed for off-line mode. For this purpose, the carrier signal frequencies at each level (carrier-based), and also amplitudes
and orders of the harmonic injected (HI) signal (reference-based) are considered as controllable parameters. The proposed
technique benefits are operating with considerably fewer numbers of the pulses per cycle, low switching losses, and
improvement in the output voltage characteristics. However, selective harmonic elimination (SHE) and optimal switching
angles (OSAs) are the most common modulation techniques, but they employ only one angle as a control parameter at each
level of the output waveform. Hence, the modulation scheme has the capability to consider more angles at each level as
controllable parameters by applying multi-objective particle swarm optimization (MOPSO) and Non-dominated sorting
genetic algorithm II (NSGA II). Simulations are conducted in 5-, 7- and 9-level inverter. Finally, the effectiveness of the studies
is validated by obtaining experimental results on a single-phase 1 kW 7-level inverter prototype.
OriginalsprogEngelsk
TidsskriftIET Power Electronics
ISSN1755-4535
StatusAccepteret/In press - 2020

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