Open AccessFast closed‐form solution of line‐to‐line voltage total harmonic distortion for three‐level inverters
Author(s) -
Farokhnia Naeem,
Ehsani Mehrdad,
Vadizadeh Hadi,
Toodeji Hamidreza,
Mohammad Muneer
Publication year - 2013
Publication title -
iet power electronics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.637
H-Index - 77
eISSN - 1755-4543
pISSN - 1755-4535
DOI - 10.1049/iet-pel.2012.0204
Subject(s) - total harmonic distortion , thd analyzer , harmonics , waveform , voltage , harmonic , line (geometry) , inverter , pulse width modulation , distortion (music) , mathematics , control theory (sociology) , topology (electrical circuits) , computer science , electronic engineering , engineering , physics , acoustics , electrical engineering , nonlinear distortion , geometry , amplifier , control (management) , cmos , combinatorics , artificial intelligence
Harmonic emission to the network must be restricted below the predefined limits, avoiding power quality problems. Total harmonic distortion (THD) is a well‐known criterion, which is used to determine harmonic content of each waveform, and extracting its exact value is very important. Three‐level inverters produce a significant amount of harmonics and the exact closed‐form expression for their line‐to‐line voltage THD has not yet been derived. All presented methods in this regard are based on an approximate approach. This study calculates line‐to‐line voltage THD of a three‐level inverter by two different methods and presents their relevant formulas. The first method is usable for any number of controlled PWM switching angles, but the second method is limited to low number of switching angles. By the presented mathematical formulas in this study, the THD is computed simply, accurately and rapidly. The proposed methods are compared with the conventional methods and their advantages are verified by simulation and experimental results.