Open AccessAnalysis and calculation on switching frequency and switching losses of modular multilevel converter with maximum sub‐module capacitor voltage deviation
Author(s) -
Huang Shoudao,
Liao Wu,
Liu Ping,
Tang Weichu,
Huang Sheng
Publication year - 2016
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.2015.0418
Subject(s) - capacitor , voltage , matlab , modular design , frequency deviation , control theory (sociology) , range (aeronautics) , switching frequency , switching time , electronic engineering , automatic frequency control , computer science , engineering , electrical engineering , control (management) , operating system , artificial intelligence , aerospace engineering
To reduce switching frequency of modular multilevel converter (MMC), proper sub‐module (SM) capacitor voltage deviations would be allowed in the nearest level control. This study proposes a new method to evaluate the switching frequency and switching losses of MMC with maximum SM capacitor voltage deviation. Switching transitions are presented and then the analytic equations of switching frequency and switching losses are derived based on the definite integration approximate substitution. The factors affecting the switching frequency and losses are summarised. Besides, this study analyses the range of maximum SM capacitor voltage deviation as well. The accuracy of this method is proved by a 46‐level single‐phase MMC under different operating conditions in MATLAB/Simulink. Finally, a 9‐level single‐phase MMC laboratory prototype is also built to validate this method.