TY - JOUR
T1 - Evaluation of Three-Phase Transformerless Photovoltaic Inverter Topologies
AU - Kerekes, Tamas
AU - Liserre, Marco
AU - Teodorescu, Remus
AU - Klumpner, C.
AU - Sumner, M.
PY - 2009
Y1 - 2009
N2 - This paper analyzes and compares three transformerless photovoltaic inverter topologies for three-phase grid connection with the main focus on the safety issues that result from the lack of galvanic isolation. A common-mode model, valid at frequencies lower than 50 kHz, is adopted to study the leakage current paths. The model is validated by both simulation and experimental results. These will be used to compare the selected topologies, and to explain the influence of system unbalance and the neutral conductor inductance on the leakage current. It will be demonstrated that the later has a crucial influence. Finally, a comparison of the selected topologies is carried out, based on the adopted modulation, connection of the neutral and its inductance, effects of unbalance conditions, component ratings, output voltage levels, and filter size.
AB - This paper analyzes and compares three transformerless photovoltaic inverter topologies for three-phase grid connection with the main focus on the safety issues that result from the lack of galvanic isolation. A common-mode model, valid at frequencies lower than 50 kHz, is adopted to study the leakage current paths. The model is validated by both simulation and experimental results. These will be used to compare the selected topologies, and to explain the influence of system unbalance and the neutral conductor inductance on the leakage current. It will be demonstrated that the later has a crucial influence. Finally, a comparison of the selected topologies is carried out, based on the adopted modulation, connection of the neutral and its inductance, effects of unbalance conditions, component ratings, output voltage levels, and filter size.
KW - Inverters
KW - Leakage currents
KW - Pulsewidth-modulated (PWM) inverters
U2 - 10.1109/TPEL.2009.2020800
DO - 10.1109/TPEL.2009.2020800
M3 - Journal article
SN - 0885-8993
VL - 24
SP - 2202
EP - 2211
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 9
ER -