Published Paper Details:

The photovoltaic (PV) power systems have become very popular among the renewable energy sources. As output of the PV array is DC voltage and the grid voltage is AC voltage, the grid-connected inverter is used as an interface between them. Compared to the isolated inverters, transformerless PV inverters are most preferred because of lower cost, smaller size, and higher efficiency. As applications of non- conventional source of energy is low in buck inverter, a transformerless grid-connected boost inverter is proposed with the combination of a boost converter and a buck- boost converter. Thus, boost function can utilize optimum amount of input source and used in wide range of applications. As grounds of the PV array and the grid are shorted, the common mode leakage current can be eliminated. The inverter consists of 5 switches and the control strategy is based on sinusoidal pulse width modulation technique (SPWM). The performance study of transformerless grid-connected boost inverter is carried out with MATLAB / SIMULINK R2017b platform for an output power of 350W. Finally, output voltage of the inverter is obtained as 110V with an input voltage of 65V with THD 6.5% and efficiency 97%. The control circuit used is dSPACE ds1104 controller. This inverter can be used in the grid connected PV applications.