STUDY OF ELECTROMAGNETIC COMPATIBILITY (EMC) FOR ULTRA HIGH-SPEED POWER

对超高速电力线通信(PLC)系统的电磁兼容性(EMC)在10 kHz~100 MHz频段进行了两年的研究。研究结果表明：(1)室内环境下交流干线常用的VVF(聚氯乙烯绝缘聚氯乙烯护套电缆扁平型)电缆作为输电线路的传输模型：在使用高速PLC的频率范围内，绝缘子的介电常数和介电损耗等电特性具有频率依赖性。在此基础上对交流电源线的传输模型进行了改进。(2)用4端口网络对交流电源线、室内交流电源线、家用电器和通信线路的辐射模型进行了建模。利用该模型构建的网络计算了系统的对称性系数和输入阻抗。The An…对交流电源线辐射电磁场进行了分析计算。(3)研究了电器接入交流电源线时交流电源系统的电磁环境辐射水平。结果表明，在大于1 MHz的频率范围内的辐射水平低于小于1 MHz的辐射水平。研究了其对称性系数和输入阻抗。结果表明，这些值大于1 MHz的波动小于小于1 MHz的波动，可以预期纵向转换损耗大于20分贝，这是表现对称性的系数之一。利用简单的交流市电系统对VDSL系统的传输特性进行了研究，结果表明，与收发设备之间的距离相比，设备的位置对传输特性比较敏感。最后，研究了通信端口与交流市电端口之间的电导耦合以及通信线路与交流市电线路之间的感应耦合对VDSL系统的干扰。结果表明，对于使用本研究的系统，在正常运行条件下没有观察到PLC信号的影响，但调查还表明，当较差的条件重叠时，可能会出现影响。(4)PLC系统的免疫性研究将人为干扰应用于PLC信号的PLC系统的免疫性研究。采用窄带和宽带信号。结果表明，宽带干扰信号的影响比窄带干扰信号的影响更大。(5)电器建模利用人工电源网络测量电器在运行条件下的输入阻抗。将结果与矫治器不工作时的结果进行了比较。研究表明，当电器使用微型计算机时，两种条件之间的偏差很小，而在简单电器的情况下，例如白炽灯，偏差就会出现。较少

Electromagnetic compatibility (EMC) for ultra high-speed power line communication (PLC) system has been studied m the frequency range of from 10 KHz to 100 MHz for two years. The following results have been obtained from the study,(1)Transmission model of AC mains lineVVF (PVC-insulated PVC-sheathed cable Flat type) cable, which was commonly used for the AC mains line in indoor environment, was investigated for the performance as the transmission line: The results indicated that the electrical characteristics of the insulator, such as dielectric constant and tans, had a frequency dependence in the frequency range where a high-speed PLC was used. The transmission model of the AC mains line was improved based on the results.(2)Emission model from AC mains lineIndoor AC mains line, electrical appliance and telecommunication line were modeled by the 4-port network. The coefficient presenting symmetry and the input impedance were calculated by the network constructed with the models. The an … More alysis was also applied to calculate the radiated electromagnetic field from the AC mains line.(3)Electromagnetic environment on AC mains systemEmission level was investigated in case of the electrical appliance connected with the AC mains system. The results indicated that the emission level in the frequency range of more than 1 MHz was lower than that less than 1 MHz. The coefficient presenting symmetry and the input impedance were investigated. The results indicated that the fluctuations of these values more than 1 MHz was smaller than that less than 1 MHz, and we could expect that the longitudinal conversion loss, which was one of the coefficient presenting symmetry, was more than 20 dB. The transmission characteristics was also studied using the simple AC mains system, and the results indicated that the position of the equipment was sensitive for the characteristics compared with the distance between transmitter and receiver equipment, Finally, the interference to the VDSL system was studied for the conditions where the PLC signal appeared at the.telecommunication line by the conduction coupling between the telecommunication port and the AC mains port, and by the induction coupling between the telecommunication line and the AC mains line. The results indicated that the influence of the PLC signal was not observed on the normal operation conditions for the systems using the study, but the investigation also showed that the influence might be appeared when the worse conditions.were overlapped.(4)Immunity of PLC systemThe immunity of the PLC system was studied to apply the artificial disturbances to the PLC signal. The narrow band and the broad band signal were applied. The results showed that the influence of the broad band disturbance signal was more severe than that of the narrow band disturbance signal.(5)Modeling of electrical applianceThe input impedance of the electrical appliance was measured on the operation conditions using the artificial mains network. The results were compared with the results when the appliance was not operating. The studies, indicated that the deviation between two conditions was small when the appliances were employing micro computers, and it appeared in the case of the simple appliance, for example, an incandescence electric bulb. Less