TY - GEN
T1 - A Solution for the Full-bridge Grid-tie Inverter Using Single Virtual Ground Capacitor with UPWM
AU - Shen, Ruihua
AU - Chung, Henry Shu-Hung
PY - 2020/10/11
Y1 - 2020/10/11
N2 - A single-phase transformerless full-bridge (FB) photovoltaic (PV) grid-tie inverter is presented. It achieves the ground leakage current mitigation by single Virtual Ground (VG) capacitor without extra switching devices. A hybrid pulsewidth modulation (HPWM) scheme is proposed to profile the output current and prevent sudden changes in the common-mode voltage. The HPWM is effectively the same as unipolar PWM (UPWM), but with soft voltage transition modulation (SVTM) introduced around the zero crossings. Apart from low switching losses, the output filter is implemented with a minimum number of components to achieve high attenuation of ripple current. Three commonly used PWM schemes for PV inverters are described. The intrinsic reason for oscillation phenomenon in bridgeless inverters with single VG capacitor is presented. A 340W, 380Vdc / 110Vac, 50Hz prototype has been built and evaluated.
AB - A single-phase transformerless full-bridge (FB) photovoltaic (PV) grid-tie inverter is presented. It achieves the ground leakage current mitigation by single Virtual Ground (VG) capacitor without extra switching devices. A hybrid pulsewidth modulation (HPWM) scheme is proposed to profile the output current and prevent sudden changes in the common-mode voltage. The HPWM is effectively the same as unipolar PWM (UPWM), but with soft voltage transition modulation (SVTM) introduced around the zero crossings. Apart from low switching losses, the output filter is implemented with a minimum number of components to achieve high attenuation of ripple current. Three commonly used PWM schemes for PV inverters are described. The intrinsic reason for oscillation phenomenon in bridgeless inverters with single VG capacitor is presented. A 340W, 380Vdc / 110Vac, 50Hz prototype has been built and evaluated.
KW - Ground leakage current
KW - nonlinear inductor
KW - pulsewidth modulation (PWM)
KW - PV
KW - transformerless inverters
KW - virtual ground
KW - Ground leakage current
KW - nonlinear inductor
KW - pulsewidth modulation (PWM)
KW - PV
KW - transformerless inverters
KW - virtual ground
KW - Ground leakage current
KW - nonlinear inductor
KW - pulsewidth modulation (PWM)
KW - PV
KW - transformerless inverters
KW - virtual ground
UR - http://www.scopus.com/inward/record.url?scp=85097144256&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85097144256&origin=recordpage
U2 - 10.1109/ECCE44975.2020.9235616
DO - 10.1109/ECCE44975.2020.9235616
M3 - RGC 32 - Refereed conference paper (with host publication)
SN - 9781728158266
T3 - ECCE - IEEE Energy Conversion Congress and Exposition
SP - 347
EP - 355
BT - ECCE 2020 - IEEE Energy Conversion Congress & Expo
PB - IEEE
T2 - 12th Annual IEEE Energy Conversion Congress and Exposition (ECCE 2020)
Y2 - 11 October 2020 through 15 October 2020
ER -
