International Research Publication House
In this paper, the common mode leakage current in the transformerless photovoltaic grid connected system is eliminated. This can be obtained by using an improved transformerless inverter which can sustain the low input voltage as the full bridge inverter and hence eliminating the common mode leakage current. Both unipolar sinusoidal pulse width modulation as well as the double frequency sinusoidal pulse width modulation control strategy can be used to obtain the three-level output. High frequency and lower current ripples are obtained by applying the double-frequency sinusoidal pulse width modulation and hence the total harmonics distortion of the grid-connected current is reduced.