Investigation of improved Differential Y-source inverter

Abstract

Y-typed networking with three winding-coupled inverter is a brand-new DC-DC and DC-AC inverter. The inverter has a simple topology structure. However, it owns powerful functions. The inverter, with two Y-shaped structures, has not adopted two independent circuits, which are replaced by some new topology parts, such as the switches, adding up to control the current. Obviously, it has now become a single-stage inverter. The improved inverter has also been called DYSI, the Differential Y-source Inverter, for it combines the Differential Boost Inverter with the Y-source Inverter. The improved inverter would produce high AC output voltage, solving the problems caused by the low output voltage in photovoltaic inverters while increasing voltages to connect with the national grid. The modulation of the improved inverter is the half-sine wave, which drives one coupled and two switches in the branch to conduct at high times. The improved inverter also has some defects. The inverter would produce abrupt energy leakage because of the incomplete coupling of inductances. Similar to other inverters, the process during which the switches turn on and turn off would inevitably generate power loss, leading to a much lower output than the ideal design. In contrast, the deficiency could be decreased by adding two diodes without loss to the circuit topology.