Open AccessCapacitor voltage balancing and current control method of modular multilevel converter based on generalised averaging approach
Author(s) -
Xue Chang,
Ma Zhonghua
Publication year - 2017
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.2017.0183
Subject(s) - modular design , control theory (sociology) , capacitor , voltage , controller (irrigation) , computer science , current (fluid) , control variable , electronic engineering , control (management) , engineering , electrical engineering , agronomy , artificial intelligence , machine learning , biology , operating system
To solve the capacitor voltage balancing problem of modular multilevel converter (MMC) under carrier phase‐shifted modulation, MMC is modelled by generalised averaging approach. The quantitative relation between the capacitor voltage of submodule and other operating parameters is derived, and the corresponding balancing method is proposed which can make each capacitor voltage to track the reference value. According to the average model of MMC, a current controller is designed, which is suited to the voltage balancing method and can decouple the active and reactive currents. The effectiveness of the voltage balancing method and the current control method is verified by simulation results.