TY - GEN
T1 - A New Step-Up Transformerless Inverter Topology for 1- Grid-connected Solar Photovoltaic System
AU - Chamarthi, Phani Kumar
AU - Moursi, Mohamed Shawky El
AU - Khadkikar, Vinod
AU - Hosani, Khalifa Hassan Al
N1 - Publisher Copyright:
© 2020 IEEE.
PY - 2020/1
Y1 - 2020/1
N2 - In this paper, a step-up transformerless inverter topology is investigated for the grid-connected solar PV system. This proposed topology combines the features of the DC-DC step-up converter and two-level inverter. The important features of this topology are: First, the proposed topology keeps the negative terminal of the PV source directly connected with the neutral of the grid. Therefore, there is no variation in the CMV, which appears across the PV parasitic capacitance, resulting in negligible leakage current and higher efficiency. Negligible leakage current makes this topology highly suitable for transformerless grid-connected solar PV application; second, due to the step-up feature of the proposed topology, the inverter output voltage can be greater than the input DC voltage of solar PV which makes the proposed topology suitable for connecting lower voltage solar PV modules. The topology works with a simple and dedicated PWM scheme, which consists of certain logic operations as explained in the text. The modes of operation, design of the converter, PWM strategy, and analysis are presented in detail. The MATLAB/Simulink environment is used to simulate the proposed grid-connected system for 300W power rating and all the results are included in the paper, which shows that the proposed system gives higher efficiency with lower THD in grid-current.
AB - In this paper, a step-up transformerless inverter topology is investigated for the grid-connected solar PV system. This proposed topology combines the features of the DC-DC step-up converter and two-level inverter. The important features of this topology are: First, the proposed topology keeps the negative terminal of the PV source directly connected with the neutral of the grid. Therefore, there is no variation in the CMV, which appears across the PV parasitic capacitance, resulting in negligible leakage current and higher efficiency. Negligible leakage current makes this topology highly suitable for transformerless grid-connected solar PV application; second, due to the step-up feature of the proposed topology, the inverter output voltage can be greater than the input DC voltage of solar PV which makes the proposed topology suitable for connecting lower voltage solar PV modules. The topology works with a simple and dedicated PWM scheme, which consists of certain logic operations as explained in the text. The modes of operation, design of the converter, PWM strategy, and analysis are presented in detail. The MATLAB/Simulink environment is used to simulate the proposed grid-connected system for 300W power rating and all the results are included in the paper, which shows that the proposed system gives higher efficiency with lower THD in grid-current.
KW - DC-DC converter
KW - Leakage current
KW - PV fed system
KW - Step-up transformer-less inverter
KW - Two-level inverter
UR - http://www.scopus.com/inward/record.url?scp=85084359512&partnerID=8YFLogxK
U2 - 10.1109/PESGRE45664.2020.9070526
DO - 10.1109/PESGRE45664.2020.9070526
M3 - Conference contribution
AN - SCOPUS:85084359512
T3 - 2020 IEEE International Conference on Power Electronics, Smart Grid and Renewable Energy, PESGRE 2020
BT - 2020 IEEE International Conference on Power Electronics, Smart Grid and Renewable Energy, PESGRE 2020
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2020 IEEE International Conference on Power Electronics, Smart Grid and Renewable Energy, PESGRE 2020
Y2 - 2 January 2020 through 4 January 2020
ER -
