TY - GEN
T1 - Leakage Current Reduction with 240CPWM in Silicon Carbide based Transformerless Grid-connected PV Converter
AU - Qamar, Hafsa
AU - Qamar, Haleema
AU - Korada, Nikhil
AU - Sondharangalla, Madhura
AU - Ayyanar, Raja
N1 - Funding Information:
ACKNOWLEDGMENT This work made use of facility supported by the National Science Foundation Industry-University Collaborative Research Center for Efficient Vehicles and Sustainable Transportation Systems under Award No. IIP-1624842.
Publisher Copyright:
© 2022 IEEE.
PY - 2022
Y1 - 2022
N2 - High leakage current is one of the major reliability concerns in transformerless grid-connected (TLGC) PV converters due to lack of galvanic isolation. Large leakage capacitance of PV modules in TLGC PV systems makes the resonant frequency of the leakage path very low. It forces high leakage current if switching frequency of inverter is close to the resonant frequency as in traditional inverters. Switching frequency can be kept higher than the resonant frequency of the leakage path to achieve lower leakage currents. A relatively new PWM method called 240◦ clamped PWM (240CPWM) encourages the use of higher switching frequency because of its lowest switching loss. This work deploys 240CPWM in silicon carbide based inverter at switching frequency of 100 kHz that gives 70% saving in leakage current and 4.7 times reduction in AC filter inductor volume as compared to silicon based inverter switching at 10 kHz without compromising the inverter efficiency.
AB - High leakage current is one of the major reliability concerns in transformerless grid-connected (TLGC) PV converters due to lack of galvanic isolation. Large leakage capacitance of PV modules in TLGC PV systems makes the resonant frequency of the leakage path very low. It forces high leakage current if switching frequency of inverter is close to the resonant frequency as in traditional inverters. Switching frequency can be kept higher than the resonant frequency of the leakage path to achieve lower leakage currents. A relatively new PWM method called 240◦ clamped PWM (240CPWM) encourages the use of higher switching frequency because of its lowest switching loss. This work deploys 240CPWM in silicon carbide based inverter at switching frequency of 100 kHz that gives 70% saving in leakage current and 4.7 times reduction in AC filter inductor volume as compared to silicon based inverter switching at 10 kHz without compromising the inverter efficiency.
KW - 240-Clamped PWM (240CPWM)
KW - Common Mode Voltage (CMV)
KW - Leakage current
KW - Photovoltaic (PV)
KW - Silicon Carbide (SiC) inverter
UR - http://www.scopus.com/inward/record.url?scp=85144053244&partnerID=8YFLogxK
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U2 - 10.1109/ECCE50734.2022.9947898
DO - 10.1109/ECCE50734.2022.9947898
M3 - Conference contribution
AN - SCOPUS:85144053244
T3 - 2022 IEEE Energy Conversion Congress and Exposition, ECCE 2022
BT - 2022 IEEE Energy Conversion Congress and Exposition, ECCE 2022
PB - Institute of Electrical and Electronics Engineers Inc.
T2 - 2022 IEEE Energy Conversion Congress and Exposition, ECCE 2022
Y2 - 9 October 2022 through 13 October 2022
ER -