Open AccessAsymmetrical carrier phase‐shifted pulse‐width modulation for partly regenerative converter
Author(s) -
Zha Xiaoming,
Yang Zezhou,
Gong Jinwu,
Li Shangsheng,
Liu Fei,
Huang Meng
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.2016.0405
Subject(s) - pulse width modulation , modulation (music) , phase (matter) , pulse (music) , materials science , phase modulation , optoelectronics , electrical engineering , physics , engineering , acoustics , voltage , quantum mechanics
A cascaded H‐bridge‐based partly regenerative converter is a low‐cost scheme to enable a medium‐voltage motor drive to feed back the braking energy to the grid. However, its asymmetrical topology induces serious switching harmonic distortion on the motor side when conventional symmetrical carrier phase‐shift pulse‐width modulation (SCPS‐PWM) is used. This study analyses switching harmonic characteristics in detail and proposes an asymmetrical carrier phase‐shift pulse‐width modulation (ACPS‐PWM) method to improve the switching harmonic performance of the partly regenerative converter by eliminating low‐frequency switching harmonics. The proposed method transcends the limitation of SCPS‐PWM on carrier phase‐shift angles, increasing the controllable degrees of freedom that can be used to multiply the apparent switching frequency without extra hardware or software investment. ACPS‐PWM is compared with other modulation methods, and the possibilities for other applications are discussed. Experimental results verify the effectiveness of the proposed method.