TY - JOUR
T1 - A Novel Asymmetrical 21-Level Inverter for Solar PV Energy System with Reduced Switch Count
AU - Khasim, Shaik Reddi
AU - Dhanamjayulu, C.
AU - Sanjeevikumar, P.
AU - Holm-Nielsen, Jens Bo
AU - Mitolo, Massimo
N1 - Publisher Copyright:
CCBY
Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.
PY - 2021
Y1 - 2021
N2 - This article presents a novel asymmetrical 21-level multilevel inverter topology for solar PV application. The proposed topology achieves 21-level output voltage without H-bridge using asymmetric DC sources. This reduces the devices, cost and size. The PV standalone system needs a constant DC voltage magnitude from the solar panels, maximum power point tracking (MPPT) technique used for getting a stable output by using perturb and observe (PO) algorithm. The PV voltage is boosted over the DC link voltage using a three-level DC-DC boost converter interfaced in between the solar panels and the inverter. The inverter is tested experimentally with various combinational loads and under dynamic load variations with sudden load disturbances. Total standing voltage with a cost function for the proposed MLI is calculated and compared with multiple topologies published recently and found to be cost-effective. A detailed comparison is made in terms of switches count, and sources count, gate driver boards, the number of diodes and capacitor count and component count level factor with the same and other levels of multilevel inverter and found to be the proposed topology is helpful in terms of its less TSV value, devices count, efficient and cost-effective. In both simulation and experimental results, total harmonic distortion (THD) is observed to be the same and is lower than 5% which is under IEEE standards. A hardware prototype is implemented in the laboratory and verified experimentally under dynamic load variations, whereas the simulations are done in MATLAB/Simulink.
AB - This article presents a novel asymmetrical 21-level multilevel inverter topology for solar PV application. The proposed topology achieves 21-level output voltage without H-bridge using asymmetric DC sources. This reduces the devices, cost and size. The PV standalone system needs a constant DC voltage magnitude from the solar panels, maximum power point tracking (MPPT) technique used for getting a stable output by using perturb and observe (PO) algorithm. The PV voltage is boosted over the DC link voltage using a three-level DC-DC boost converter interfaced in between the solar panels and the inverter. The inverter is tested experimentally with various combinational loads and under dynamic load variations with sudden load disturbances. Total standing voltage with a cost function for the proposed MLI is calculated and compared with multiple topologies published recently and found to be cost-effective. A detailed comparison is made in terms of switches count, and sources count, gate driver boards, the number of diodes and capacitor count and component count level factor with the same and other levels of multilevel inverter and found to be the proposed topology is helpful in terms of its less TSV value, devices count, efficient and cost-effective. In both simulation and experimental results, total harmonic distortion (THD) is observed to be the same and is lower than 5% which is under IEEE standards. A hardware prototype is implemented in the laboratory and verified experimentally under dynamic load variations, whereas the simulations are done in MATLAB/Simulink.
KW - Cost function (CF)
KW - Inverters
KW - Maximum power point trackers
KW - Maximum power point tracking (MPPT)
KW - Multilevel inverter
KW - Multilevel inverters
KW - Photovoltaic (PV) system
KW - Photovoltaic cells
KW - Solar panels
KW - Through-silicon vias
KW - Topology
KW - Total harmonic distortion (THD)
KW - TSV Calculation
UR - http://www.scopus.com/inward/record.url?scp=85099567879&partnerID=8YFLogxK
U2 - 10.1109/ACCESS.2021.3051039
DO - 10.1109/ACCESS.2021.3051039
M3 - Journal article
AN - SCOPUS:85099567879
SN - 2169-3536
VL - 9
SP - 11761
EP - 11775
JO - IEEE Access
JF - IEEE Access
M1 - 9320488
ER -