Open AccessCirculation suppression of synchronous/interleaving paralleled 400 Hz three‐phase four‐leg inverter based on third harmonics injection
Author(s) -
Chen Yihan,
Guo Honghao,
Ma Haixiao,
Zhou Yan,
Chen Jiawei
Publication year - 2019
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.2018.5737
Subject(s) - inverter , control theory (sociology) , interleaving , harmonic , feed forward , harmonics , computer science , signal (programming language) , repetitive control , voltage , electronic engineering , control system , engineering , physics , control (management) , acoustics , electrical engineering , control engineering , artificial intelligence , programming language
In this study, the third harmonic injection method based on analogue circuit is applied in the interleaving parallel three‐phase four‐leg (3P4L) inverter, the adverse effects of injected signals on the circulating current are found, and the corresponding control strategy solution is proposed. At the beginning of this study, by using the large‐signal model of leg, it is proved that four legs can be decoupled, on the basis of this conclusion, the current sharing control strategy based on dual‐loop scheme and third harmonic injection can be applied in paralleled 3P4L inverter, however, peak value of circulating current is increased by zero‐sequence component which is caused by injected signals. Therefore, output impedance analysis method is applied, and the control strategy including zero‐sequence component feedforward loop is proposed, which can be implemented with analogue circuit, and is suitable for the 400 Hz synchronous/interleaving paralleled inverter systems. Finally, the effectiveness of the control strategy is verified by simulation and experiment.