An improved single‐phase Y‐source inverter with continuous input current and reduced effects of leakage inductances.

The Y‐source inverter has a high voltage gain by using a small shoot‐through duty ratio, so it is very suitable for photovoltaic (PV) systems. However, the input current of the traditional Y‐source inverter is discontinuous, and the leakage inductances in the coupling inductor lead to dc‐link voltage spikes and reduce the dc‐link voltage. To address these issues, an improved Y‐source inverter topology is proposed in this paper. The improved Y‐source inverter provides continuous input current and a higher voltage gain by adding one additional inductor and one capacitor. Compared to the traditional Y‐source inverter, the improved Y‐source inverter has lower voltage spikes and higher dc‐link voltage. Moreover, the proposed inverter can suppress resonant current at startup. In this paper, the operating principles and effects of the leakage inductances are analyzed. Finally, a 200 W laboratory prototype is built based on a TMS320F2812 digital signal processor to verify the performance of the improved inverter. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc. [ABSTRACT FROM AUTHOR]