Open AccessRPWM selective voltage harmonic elimination method for single‐phase five‐level MPUC inverter based on cell division
Author(s) -
Li Guohua,
Cao Dongman,
Wang Yufeng
Publication year - 2021
Publication title -
iet generation, transmission and distribution
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.92
H-Index - 110
eISSN - 1751-8695
pISSN - 1751-8687
DOI - 10.1049/gtd2.12220
Subject(s) - inverter , harmonics , control theory (sociology) , pulse width modulation , harmonic , total harmonic distortion , voltage , power (physics) , fundamental frequency , computer science , electronic engineering , engineering , physics , electrical engineering , acoustics , control (management) , quantum mechanics , artificial intelligence
The conventional selective harmonic elimination method of random pulse width modulation (RPWM) is only suitable for the two‐level inverter. Furthermore, when the harmonics below 6 kHz are selectively eliminated, it is easy to cause a low average switching frequency of the inverter, which leads to the increase of load current distortion rate. This paper proposes an RPWM selective voltage harmonic elimination method for a single‐phase five‐level MPUC (modified packed U‐cells) inverter based on cell division. The MPUC inverter is supposed to be divided into three series cells, and the carrier stacking strategy is used to realize the coordinated control between each cell. In the process of RPWM, the average switching frequency can be controlled within a certain range by selecting the random number. This method is divided into normal mode and master–slave mode. In the normal mode, the selective harmonic elimination is realized by the method of cancelling the front and back terms of Fourier series in each cell. In the master–slave mode, the master cell is mainly used for fundamental power output, and the slave cell is mainly used for RPWM selective harmonic elimination. The effectiveness of the proposed method is verified by the simulation and experimental results.