Comparative Analysis of Conducted Emission of Off-Grid PV Inverter Using Different DC- LISN s

The comparison and analysis of conducted emission measurements on the off-grid photovoltaic (PV) inverter on the direct current (DC) side using two DC Line Impedance Stabilization Network (DC-LISN) models has been successfully carried out. The DC- LISN originating from the manufacturer was used as the first model while the self-developed model using more affordable materials was used as the second model. The impedance and isolation characteristic values of each DC-LISN are compared based on CISPR 16-1-2:2014. The results of impedance and isolation of each DC-LISN were within the tolerance range allowed by the standard. Furthermore, the measurement setup in the IEC 62920:2017 standard was applied to measure the conducted emission on the DC side of the PV inverter various in no-load mode. The highest level of noise was obtained with the 500 W inverter, both when using the first and second DC-LISN models. In addition, the difference of the maximum peak noise value of about 6 dB between the first and second DC-LISN models were due to the inductance value, 5 μH for the first DC-LISN and 50 μH for the second DC-LISN. The discrepancy of the peak noise profile at high frequency that occurs in all inverters were due to differences in the characteristics of DC-LISN components. However, the entire peak noise profile of the second DC-LISN model is utterly similar to the first model interprets that the low-cost, self-developed DC- LISN could be used as an alternative to conduct the conducted emission measurement of PV inverters.