TY - JOUR
T1 - Energy Efficiency Enhancement in Full-Bridge PV Inverters with Advanced Modulations
AU - Tang, Zhongting
AU - Sangwongwanich, Ariya
AU - Yang, Yongheng
AU - Blaabjerg, Frede
PY - 2021
Y1 - 2021
N2 - Transformerless single-phase inverters are preferring in residential grid-connected PV systems when compared to galvanic-isolated ones (i.e., transformer-based inverters). In addition to the special leakage current issue, high efficiency, power quality and reactive power injection are of concern that should be considered in grid-connected applications. Nowadays, the fast development of wide-bandgap (WBG) devices brings new challenges to transformerless inverters, e.g., electromagnetic interference (EMI) issues, but efficiency can be improved. This paper first reviews the full-bridge PV inverters seen from the perspective of topology configuration. The oscillation during switching transitions is analyzed and compared in typical full-bridge inverters under a hybrid modulation method, which has a significant relationship with the EMI issue. Then, power loss distribution is discussed to reveal the thermal performance under the hybrid modulation scheme with reactive power injection. Simulations are carried out on the full-bridge prototype to validate the discussions of the hybrid modulation strategy.
AB - Transformerless single-phase inverters are preferring in residential grid-connected PV systems when compared to galvanic-isolated ones (i.e., transformer-based inverters). In addition to the special leakage current issue, high efficiency, power quality and reactive power injection are of concern that should be considered in grid-connected applications. Nowadays, the fast development of wide-bandgap (WBG) devices brings new challenges to transformerless inverters, e.g., electromagnetic interference (EMI) issues, but efficiency can be improved. This paper first reviews the full-bridge PV inverters seen from the perspective of topology configuration. The oscillation during switching transitions is analyzed and compared in typical full-bridge inverters under a hybrid modulation method, which has a significant relationship with the EMI issue. Then, power loss distribution is discussed to reveal the thermal performance under the hybrid modulation scheme with reactive power injection. Simulations are carried out on the full-bridge prototype to validate the discussions of the hybrid modulation strategy.
U2 - 10.1016/j.prime.2021.100004
DO - 10.1016/j.prime.2021.100004
M3 - Journal article
SN - 2772-6711
VL - 1
JO - e-Prime: Advances in Electrical Engineering, Electronics and Energy
JF - e-Prime: Advances in Electrical Engineering, Electronics and Energy
M1 - 100004
ER -