Harmonic analysis: Comparison between different modulation strategies for three phase inverter connecting Distributed Generation

The paper deals with the results of a study performed by RSE, in the frame of the Research Fund for the Italian Electrical System, and Politecnico di Milano focused on the evaluation of the harmonic impact in the distribution networks caused by the Distributed Generation, generally connected through Voltage Source Inverter (VSI). In particular the two-level three phase Pulse Width Modulation (PWM) inverter configuration has been investigated and the Fourier series analysis of the output voltage, has been evaluated. To reduce the harmonic impact of the inverters connected at the Point of Common Coupling (PCC) the interleaved inverters configuration has also been analysed.