Analysis of conducted EMI with a standalone solar-powered DC motor


Abstract: The green environment warrants not only researchers, but rather all citizens, to adopt renewable energy sources. One such option is the use of solar energy, especially the conversion of light energy from the sun to electric energy. The conversion of light to electricity with the help of photovoltaic cells (PV), though widely used, has its own problems, such as undesirable electromagnetic interference (EMI), both in radiation and conduction modes. The present research aims to mitigate the unwanted EMI in the conduction mode (to limit the scope of the research). The mitigation of the conducted EMI on a DC/DC buck converter was studied with a standalone 4050 W PV plant. The conducted EMI was measured and the effectiveness of randomization on the spreading of the dominating frequency was examined by a simulation using PSpice software, and the same was validated in real-time measurements. All of the investigations were accomplished using an embedded LPC2129 ARM processor. The theoretical analysis and the experiment results of the conducted noise spectrum were compatible with each other, based on which a randomized duty ratio and a random pulse-position modulation (RPPM) with a fixed carrier frequency scheme were contemplated for adoption.

Keywords: Electromagnetic interference, conducted electromagnetic interference, photovoltaic system, pulse width modulation, randomized pulse width modulation

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