A Single-Phase Asymmetrical T-Type Five-Level Transformerless PV Inverter

作者：Escobar Valderrama Gerardo; Vazquez Guzman Gerardo; Pool Mazun Erick I; Raymundo Martinez Rodriguez Panfilo; Lopez Sanchez Manuel J; Sosa Zuniga Jose Miguel

来源：IEEE Journal of Emerging and Selected Topics in Power Electronics, 2018, 6(1): 140-150.

DOI：10.1109/JESTPE.2017.2726989

• Grid connection
• leakage current
• multilevel inverters
• photovoltaic (PV) generation
• transformerless inverters

This paper presents a transformerless single-phase inverter topology based on a modified H-bridge-based multilevel converter. The topology comprises two legs, namely, a usual two-level leg and a T-type leg. The latter is based on a usual two-level leg, which has been modified to gain access to the midpoint of the split dc-link by means of a bidirectional switch. The topology is referred as an asymmetrical T-type five-level (5L-T-AHB) inverter. An ad hoc modulation strategy based on sinusoidal pulsewidth modulation is also presented to control the 5L-T-AHB inverter, where the two-level leg is commuted at fundamental frequency. Numerical and experimental results show that the proposed 5L-T-AHB inverter achieves high efficiency, exhibits reduced leakage currents, and complies with the transformerless norms and regulations, which makes it suitable for the transformerless PV inverters market.(1)

• 出版日期2018-3