Open AccessThree‐mode pulse‐width modulation of a three‐phase four‐wire inverter
Author(s) -
Li Xiangfeng,
Zhang Bo,
Qiu Dongyuan
Publication year - 2015
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.2014.0907
Subject(s) - inverter , controllability , pulse width modulation , control theory (sociology) , power (physics) , modulation (music) , phase (matter) , pulse (music) , three phase , pulse density modulation , mode (computer interface) , electronic engineering , computer science , topology (electrical circuits) , voltage , materials science , physics , mathematics , engineering , electrical engineering , acoustics , control (management) , pulse amplitude modulation , quantum mechanics , artificial intelligence , operating system
In order to reduce the switching frequencies of power semiconductors and then to increase the efficiency in a three‐phase four‐wire inverter, the state controllability of a system is investigated by considering the inverter as a switched linear system. It is found that a three‐phase four‐wire inverter is a three‐mode controllable, therein, only three non‐zero vectors are required to make the system completely state controllable. With the three operating modes, a novel control strategy, called a three‐mode pulse‐width modulation (3‐MPWM), is proposed in this study. There are three types of 3‐MPWMs, that is, 3‐MPWM(I), 3‐MPWM(II) and 3‐MPWM(III). Compared with the conventional space‐vector pulse width modulation strategy, the switching frequencies of the proposed 3‐MPWMs are significantly reduced by two‐thirds, hence, the switching losses of the power semiconductors can be reduced and the efficiency of the inverter can be improved. In addition, the number of operating modes used in 3‐MPWM(I) and 3‐MPWM(II) is reduced by a half. Finally, simulation and experimental results are conducted to verify the effectiveness of the 3‐MPWM strategies.