低压电力载波中通信频点阻抗与脉冲噪声特性关系

Research on the Relationship between Communication Frequency Impedance Variation and Impulse Noise Characteristics in the Low-voltage Power Line Carrier

利用比值法原理,选取不同环境,在80 k Hz^500 k Hz频段内,对低压电力线的阻抗和信道噪声进行了测量,并对所测数据进行处理计算。分析电力线网络中不同时间段通信频点的阻抗变化范围与信道中脉冲噪声特性的关系。分析结果表明:在80~500 k Hz频段内,输入阻抗变化范围与信道脉冲噪声数量和功率有同增同减的关系;阻抗具有很强的时变性;电网结构及负载类型、数量对阻抗变化范围影响较大。

Choosing different environments on campus,the impedance of the low-voltage power line and channel noise in the range of 80 ~ 500 k Hz was measured by ratio method principle. Process and calculate the data obtained by collection,and then analyze the relationship between impulse noise characteristics and communication frequency impedance variation on low-voltage power line in different times. The analysis of results show that： in the range of 80 ~ 500 k Hz,the input- impedance variation and the number and power of impulse noise has the relationship of increasing or decreasing synchronously; Impedance has a strong time- varying;The impedance variation can be seriously influenced by the structure of the power grid,load type and quantity.