PLC对电能质量和电气设备的影响

宽带PLC以其资源广、一线多用以及各类电器可直接作为网络终端等优势，成为当前通信与网络研究的一个热点，而电力线通信的载波信号却不可避免地将高频信号叠加到现有的电源线上，会对电能质量产生影响。首先说明了目前电力线通信主要应用的调制技术，如模拟系统、数字系统(ASK、DSK、PSK)、扩频通信和正交频分复用技术(OFDM)等，及其载波信号的特性，进而以我国电能质量标准以及电气设备的电磁兼容特性为基础，分析了目前PLC技术对电能质量和电气设备的影响。

Effects of PLC on electrical energy quality and electric fittings

Broadband PLC has become the hot topic for researching communication and network nowadays because of its several advantages,such as resourcefulness,multi-use of one cable,all kinds of electric components can directly be used for network terminals. However,the carrier signals of PLC inevitably add the high-frequency signals to the present power lines,so some effects are exerted on the electrical energy quality. Firstly,the main modulation techniques applied to PLC are introduced in the paper,such as analog system,digital system (ASK,DSK,PSK),spread spectrum communication and OFDM,then the characteristics of carrier signals are presented. Furthermore,based on the standard of electrical energy quality in China and the electromagnetic compatibility of electric fittings,the effects of PLC technique on electrical energy quality and electric fittings are analyzed.