Analysis of electromagnetic disturbances in DC network of grid connected building-integrated photovoltaic system

This paper focuses on conducted electromagnetic interference (EMI) emissions and propagation in the DC network of grid connected building integrated photovoltaic (PV) system. The investigated PV system, consists of ten solar panels, cabling and the grid-connected one phase inverter. The EMI simulation model of the real PV system has been developed with the aid of impedance analyzer measurements of solar panels and the DC network cable. Simulation study was carried out in the LTspice software environment. Next, the common and differential mode disturbances paths impedances (seen from inverter terminals), were calculated by two methods. First method was based on voltage and current spectra obtained during PV system operation. The second method resulted from impedance measurement at the disconnected inverter terminals. Comparison of simulation and experimental differential and common mode paths impedances indicates coherency level strongly dependent of the EMI frequency range.