NDLI: Improved harmonic injection pulse-width modulation variable frequency triangular carrier scheme for multilevel inverters

Content Provider	IET Digital Library
Author	Yeganeh, Mohammad Sadegh Orfi Sarvi, Mohammad Blaabjerg, Frede Davari, Pooya
Abstract	This study proposes an optimised controllable pulse-width modulation (PWM) scheme suitable for multilevel inverters. Seeing the need for improving the output voltage characteristics such as total harmonic distortion, low-order harmonic and distortion factor, an improved harmonic injection PWM variable frequency triangular carrier 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 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 and optimal switching angles 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 can consider more angles at each level as controllable parameters by applying multi-objective particle swarm optimisation 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.
Starting Page	3146
Ending Page	3154
Page Count	9
ISSN	17554535
Volume Number	13
e-ISSN	17554543
Issue Number	Issue 14, Nov (2020)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/iet-pel/13/14
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/iet-pel.2020.0232
Journal	IET Power Electronics
Publisher Date	2020-06-19
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	7-level Inverter Prototype 9-level Inverter Carrier Signal Frequencies Control of Electric Power System Distortion Factor Genetic Algorithm Harmonic Distortion Harmonic Injection Pulse-width Modulation Variable Frequency Triangular Carrier Harmonic Injection PWM Variable Frequency Triangular Carrier Modulation Harmonic-injected Signal Harmonics Suppression Multilevel Inverter Optimal Switching Angles Optimisation Technique Optimised Controllable Pulse-width Modulation Output Voltage Characteristic Particle Swarm Optimisation Power Electronics Power Supply Power System Control PWM Invertors Selective Harmonic Elimination Supervisory Circuit Total Harmonic Distortion
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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