Medium-voltage power tine broadband carrier is the best communication method to overcome the bottleneck in distribution network automation. Efficient and reliable coupling technology is the basis for the development or high-speed broadband power line communication. It requires linear transmission of signals in a wide frequency banri which cannot be satisfied by traditional narrow-band coupling methods. From the perspective of network structures and transmission characteristics, the requirements for broadband carrier coupler for medium-voltage power lines are analyzed. The impedance of the 10-kV distribution network varies irregularly with frequency changes. A composite coupling technology, which combines electromagnetic coupling with resistive and capacitive coupling, is applied in design of high-efficiency low-output impedance broadband coupled circuit to reduce the. influence of impedance. Finally, the frequency characteristics of coupled circuits and the loading efficiency of carrier signals are analyzed. The results show that the proposed coupled circuits meet the demands of high-speed broadband communications.%中压电力线宽带载波是解决配网自动化瓶颈问题的最佳通信方式,高效、可靠的耦合技术是电力线通信高速宽带化发展的基础,它要求信号在很宽的频带上线性传输,传统的窄带耦合已不能满足要求.作者从网络结构和传输特性的角度,分析中压电力线宽带载波对耦合器的要求,指出10kV配电网阻抗随频率呈不规则变化.进而采用“电磁耦合”与“阻容耦合”相结合的“复合耦合技术”设计了减小阻抗影响的高效宽带低输出阻抗的耦合电路.最后对耦合电路的频率特性及载波信号加载效率进行分析,结果表明该耦合电路能满足高速宽带的通信需求.
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