| With the gradual transformation of national economic development strategy,the investigation and upgrading of various information technologies are in full swing.Various communication technologies are widely used in the power system.Power line communication(PLC)technology utilizes abundant power facilities to realize data communication,which has great social and economic value.At present,PLC technology has been developed comparatively well and can provide many services.However,the wide application of PLC technology still faces many challenges,among which electromagnetic compatibility(EMC)has become a bottleneck for the further development of PLC.In order to obtain the quantitative analyses of electromagnetic radiation generated by PLC system in engineering applications,the electromagnetic radiation measurement and simulation analysis of PLC system used for power meter reading are carried out in this paper.First of all,experimental systems of PLC are set up in comparatively open fields,and PLC radiated intensity at typical measurement locations is measured.Results show that the radiation intensity of experimental system basically meets the FCC Part 15 standard limit.The simulation model of PLC is established using method of moment,and its effectiveness is verified by comparing calculated results with measured data.The next,the operating conditions of PLC system at application sites and the Maxhold radiation measurement method are analyzed.Field tests show that for straight power lines,longitudinal distribution of PLC radiation is fluctuant,and radiated lateral attenuation is significant and rapid with a perceived range of 100-150 m.Comparing the two states of PLC working and stopping,it is measured that the radiated contribution value of PLC system can reach 15 dBμV/m with lateral distance 10 m.For crossed vertical power lines,the PLC radiation distribution is uneven and fluctuates remarkably.A numerical analysis method that compares the measured values of PLC radiation,the calculated values of PLC radiation and the measured values of background noise is proposed.Finally,simulation models of complex PLC station are established.Adjusting the model parameters.the effect of influence factors on PLC radiation is summarized,such as height of lines,radius of lines,spacing between lines,terminal load and relative permittivity of shielded.The radiated distribution characteristics of complex stations within external range of one kilometer are studied.Using modeling method of this paper,the electromagnetic radiation distribution of PLC system can be predicted effectively. |
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