Open AccessSwitching strategies for a multi-level inverter
Author(s) -
Sayat Moldakhmetov,
V P Ivel,
Y V Gerasimova,
P A Petrov,
N B Kaliaskarov
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1155/1/012094
Subject(s) - inverter , harmonics , waveform , total harmonic distortion , voltage , pulse width modulation , grid tie inverter , harmonic , power (physics) , modulation (music) , signal (programming language) , spectrogram , distortion (music) , power factor , computer science , electronic engineering , control theory (sociology) , physics , engineering , electrical engineering , acoustics , maximum power point tracking , control (management) , amplifier , quantum mechanics , artificial intelligence , computer vision , programming language , cmos
The article examines the methods of switching the stages of a multi-level inverter in order to reduce the harmonic factor of the output voltage of the inverter. These methods use pulse-width modulation for switching, which is obtained by comparing a reference sinusoidal signal and a sequence of triangular pulses. The article describes the algorithms for obtaining the control sequence of pulses and simulates each of the strategies. The dependence of the nonlinear distortion factor on the frequency of the carrier wave for different switching strategies is obtained based on the simulation results. The influence of the LPF on the quality of the output voltage of the inverter is also investigated. In addition, an experimental study of a six-level inverter was carried out. The waveforms and spectrograms of the inverter were obtained using the Fluke 434-II electrical energy analyzer. The harmonics of the output voltage, which are distinguished by power from the entire spectrum, were identified.