Abstract—This paper deals with the simulation and implementation of a single-phase grid-connected transformer-less photovoltaic inverter. The simulations were carried out using MATLAB/SIMULINK software package and hardware implemented. Results show that the proposed topology boosts or bucks the output voltage level depending upon the value of the reference (grid) signal. The inverter is derived from a boost cascaded with a buck converter along with a line frequency unfolding circuit. Due to its novel operating modes, high efficiency can be achieved because there is only one switch operating at high frequency at a time and the converter allows the use of power MOSFET and ultra-fast reverse recovery diode. The interleaved multiple phase structure is proposed to have small equivalent inductance; meanwhile, the ripple can be decreased, and the inductor size can be reduced as well. A two-phase interleaved inverter is then designed accordingly. Finally, the simulation and experiment results are shown to verify the concept and the tested efficiency under 3-kW power condition.

Index Terms—Photovoltaic inverter, Topology, Power MOSFET, Interleaved inverter

Cite: Solomon Thilakar J, Pawan Kumar R, Madhusudhanan S and Kavaskar S, "THE IMPLEMENTATION OF BOOST CASCADED BUCK CONVERTER BASED PV INVERTER WITH HIGH EFFICIENCY," International Journal of Electrical and Electronic Engineering & Telecommunications, Vol. 3, No. 1, pp. 75-83, January 2014.