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### 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.

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.

Originalsprog | Engelsk |
---|---|

Tidsskrift | IET Power Electronics |

ISSN | 1755-4535 |

Status | Accepteret/In press - 2020 |

## Fingeraftryk Dyk ned i forskningsemnerne om 'An Improved Harmonic Injection Pulse Width Modulation Variable Frequency Triangular Carrier Scheme for Multilevel Inverters'. Sammen danner de et unikt fingeraftryk.

## Projekter

- 1 Igangværende

## REPEPS: REliable Power Electronic based Power System

Blaabjerg, F., Iannuzzo, F., Davari, P., Wang, H., Wang, X. & Yang, Y.

01/08/2017 → 01/12/2023

Projekter: Projekt › Forskning

## Citationsformater

Orfi Yeganeh, M. S., Sarvi, M., Blaabjerg, F., & Davari, P. (Accepteret/In press). An Improved Harmonic Injection Pulse Width Modulation Variable Frequency Triangular Carrier Scheme for Multilevel Inverters.

*IET Power Electronics*.