TY - JOUR
T1 - Modulation Method for Improving Reliability of Multilevel T-Type Inverter in PV Systems
AU - Aly, Mokhtar
AU - Ahmed, Emad M.
AU - Shoyama, Masahito
N1 - Funding Information:
Manuscript received August 18, 2018; revised October 29, 2018 and January 12, 2019; accepted February 4, 2019. Date of publication February 7, 2019; date of current version May 6, 2020. This work was supported by the research under Project 537/39, sponsored by the Deanship of Scientific Research at Jouf University, Kingdom of Saudi Arabia. Recommended for publication by Associate Editor Josep Pou. (Corresponding author: Mokhtar Aly.) M. Aly is with the Department of Electrical Engineering, Faculty of Engineering, Aswan University, Aswan 81542, Egypt (e-mail: mokhtar.aly@ aswu.edu.eg).
Publisher Copyright:
© 2013 IEEE.
PY - 2020/6
Y1 - 2020/6
N2 - Multilevel inverters (MLIs) have proven superior performance in several applications, especially in photovoltaic (PV) applications. However, power switches in MLIs possess high failure rates due to unequal power losses distributions that shorten lifetime of the whole PV inverter. Therefore, a new pulsewidth modulation (PWM) methodology for loss balance in grid connected PV single-phase five-level inverters is presented in this paper. The proposed loss balance PWM (LBPWM) method is based on swapping the utilization of power switches through half or quarter of the fundamental line period based on the redundancies between the switching states in MLIs. In addition, the proposed LBPWM method achieves natural balance among voltages over the dc-link capacitors. The effectiveness and feasibility of the proposed LBPWM method are verified using the simulation environment and experimental prototype. Different operating conditions and points of PV inverters are investigated in addition to reliability evaluation of the PV inverter are provided. Moreover, the superior performance criterion of the proposed LBPWM methods are verified through comprehensive comparisons with the most prominent previously developed PWM methods in the literature. The generalization and implementation steps of the proposed LBPWM method are also provided.
AB - Multilevel inverters (MLIs) have proven superior performance in several applications, especially in photovoltaic (PV) applications. However, power switches in MLIs possess high failure rates due to unequal power losses distributions that shorten lifetime of the whole PV inverter. Therefore, a new pulsewidth modulation (PWM) methodology for loss balance in grid connected PV single-phase five-level inverters is presented in this paper. The proposed loss balance PWM (LBPWM) method is based on swapping the utilization of power switches through half or quarter of the fundamental line period based on the redundancies between the switching states in MLIs. In addition, the proposed LBPWM method achieves natural balance among voltages over the dc-link capacitors. The effectiveness and feasibility of the proposed LBPWM method are verified using the simulation environment and experimental prototype. Different operating conditions and points of PV inverters are investigated in addition to reliability evaluation of the PV inverter are provided. Moreover, the superior performance criterion of the proposed LBPWM methods are verified through comprehensive comparisons with the most prominent previously developed PWM methods in the literature. The generalization and implementation steps of the proposed LBPWM method are also provided.
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U2 - 10.1109/JESTPE.2019.2898105
DO - 10.1109/JESTPE.2019.2898105
M3 - Article
AN - SCOPUS:85084731092
SN - 2168-6777
VL - 8
SP - 1298
EP - 1309
JO - IEEE Journal of Emerging and Selected Topics in Power Electronics
JF - IEEE Journal of Emerging and Selected Topics in Power Electronics
IS - 2
M1 - 8636950
ER -
