INVESTIGATION OF VARIOUS PWM TECHNIQUES FOR SOLAR PV INVERTER

electrical engineering

In this paper various PWM techniques for solar Inverter are investigated for performance analysis of the system interms of the output RMS voltage, total harmonic distortion, output current and common mode voltages. The concept of virtual bus has proposed in order to eliminate the common-mode (CM) leakage current in the transformerless photovoltaic (PV) systems. By connecting the grid neutral line directly to the negative pole of the dc bus, the stray capacitance between the PV panels and the ground is bypassed. As a result, the CM ground leakage current can be suppressed completely. Meanwhile, the virtual dc bus is created to provide the negative voltage level for the negative ac grid current generation. Consequently, the required dc bus voltage is still the same as that of the full-bridge inverter. Based on this concept, a novel transformerless inverter topology is derived. This topology is fed from solar, fuel cell and wind systems and modulation techniques such as PD, VFPWM and COPWM with the unipolar sinusoidal pulse width modulation and the double frequency SPWM were investigated to reduce the output current ripple using MATLAB/SIMULINK software

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