Open AccessIntegrated step‐up non‐isolated inverter with leakage current elimination for grid‐tied photovoltaic system
Author(s) -
Hu Xuefeng,
Liang Wenjuan,
Gao Benbao,
Ma Penghui,
Zhang Yubo
Publication year - 2019
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.2018.6183
Subject(s) - inverter , photovoltaic system , inductor , voltage , electrical engineering , parasitic capacitance , grid tie inverter , grid connection , leakage (economics) , electronic engineering , grid , capacitance , materials science , computer science , engineering , maximum power point tracking , physics , electrode , mathematics , geometry , quantum mechanics , economics , macroeconomics
This study presents a non‐isolated step‐up inverter without leakage current for low‐voltage renewable energy generation such as photovoltaic (PV) cells grid connection. From the structure of the proposed inverter, the negative terminal of the PV array is directly linked with the grid neutral, so the common mode voltage of the parasitic capacitance can be kept constant and the leakage current will not be generated in theory. Moreover, this transformerless inverter can produce an AC output voltage higher than the input DC voltage, which will reduce the sizes of the generation system. A switching modulation strategy carrier‐based is analysed in detail when the input inductor current is operated in discontinuous conduction mode. The operation modes of the proposed inverter are also discussed, respectively, in positive and negative half line cycles. Finally, a digital experimental prototype is tested in the laboratory, and the experimental results are consistent with the theoretical analysis.