Investigation of Equivalent Radiated Emissions of Photovoltaic Power Line Communications through Scaled Model

Abstract

Power line communication (PLC) technology utilizes the alternating current distribution network to transmit signals, enabling high-speed information exchange in photovoltaic (PV) power systems without the need for additional wiring, thereby saving costs. The use of PV PLC technology may potentially cause radiated emissions that interfere with wireless radiocommunications, consequently leading to electromagnetic compatibility issue. Additionally, conducting accurate radiated emission measurements on-site in PV power systems can be challenging. The paper proposes a methodology utilizing a scaled model for the equivalent radiated emissions of PV PLC. This approach facilitates the execution of equivalent testing for PV PLC radiated emissions under controlled laboratory conditions. Conducting a simulation study using CST to determine the equivalent simulation of actual long-line model through scaled short-line model, three scaled short-line models with different diameters were selected for comparison with the simulated radiated emission results of long-line model. After that, the optimal scaled short-line model was determined, followed by practical testing of the scaled short-line model in an anechoic chamber. Finally, by comparing the results, the accuracy of the simulation model was validated, this further substantiates the feasibility of the research methodology employed in this study. The study serves as a reference for achieving accurate prediction of PV PLC radiated emissions and the determination of associated limits in the future.