Abstract: Rapidly increasing the demand of solar PV energy sector by the benefits of low cost, clean green energy, reliable and energy efficient systems. Maximum solar power obtained by using the concept of Maximum Power Point Tracking (MPPT) which significantly increases the efficiency of the solar photovoltaics system. The Removal of isolation transformer in grid connected Photo Voltaic (PV) inverters is desirable to increase efficiency and reduce the size, weight, and cost of these systems. However, leakage current will be flowing through the stray capacitance between the PV array and ground, causing a safety risk. The proposed inverter has inherent buck-boost capability and also has common ground between the negative terminal of the PV array and the grid neutral. Single stage energy process is achieved in buck and boost operation modes for achieving high efficiency. The smooth mode transition is realized by the proposed unipolar Sinusoidal Pulse-Width-Modulation (SPWM). This topology reduces the output current ripples, number of components, voltage stress across the switches, regulate the output voltage and switching losses. A simulation of the proposed system is modelled and evaluated with desirable results in MATLAB/Simulink.

Keywords: Photovoltaics system, Maximum Power Point Tracking (MPPT), Single-phase Transformerless PV inverter; leakage current elimination, Unipolar Sinusoidal Pulse Width Modulation (USPWM)

| DOI: 10.17148/IJIREEICE.2019.7215