Open AccessInvestigation on pulse‐width amplitude modulation‐based single‐phase quasi‐Z‐source photovoltaic inverter
Author(s) -
Liang Weihua,
Liu Yushan,
Ge Baoming,
AbuRub Haitham
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.2016.0593
Subject(s) - z source inverter , pulse width modulation , inverter , photovoltaic system , voltage , control theory (sociology) , power (physics) , electronic engineering , modulation (music) , modulation index , engineering , topology (electrical circuits) , physics , electrical engineering , computer science , acoustics , control (management) , quantum mechanics , artificial intelligence
The pulse‐width amplitude modulation (PWAM) method was proposed for the single‐phase quasi‐Z‐source inverter (qZSI)‐based photovoltaic (PV) power system to reduce quasi‐Z‐source (qZS) impedance values while improving efficiency. The method modified sinusoidal pulse‐width modulation (SPWM) of the qZSI by combining pulse‐amplitude modulation (PAM) and a varied dc‐link voltage envelope was produced. The SPWM worked at low dc‐link voltage, lowering voltage stress and avoiding shoot‐through switching. The PAM worked at the varied dc‐link voltage, reducing the number of switching events. As a result, the power dissipation decreased compared to working at the constant dc‐link voltage. This study further investigates the PWAM‐based single‐phase qZS PV inverter system. An improved topology with control strategy is proposed for its grid‐connected and standalone operation. Design method of impedance parameters is detailed. The performance in boost and buck operation is discussed when the single‐phase qZSI using SPWM and PWAM. Simulation and experimental results verify outstanding features of the PWAM for single‐phase qZSI, and the proposed approach for dual‐mode operation of the PWAM‐based single‐phase qZS PV power system.