一种电力线载波通信自适应阻抗匹配方案

A solution of adaption impedance matching for power line communication system

分析了电力线载波通道阻抗不匹配的原因和危害,指出了实现阻抗匹配的重要性。提出了一种电力线载波通信自适应阻抗匹配的方案。本方案利用实时检测载波通信设备的发送电平与额定发送电平是否一致来判断是否阻抗匹配,并通过单片微处理器实现遗传算法优化策略,调整变容二极管,使得改进的L型匹配网络对载波通信设备的阻抗匹配。对系统可行性及参数调整进行了分析,并用Matlab的遗传算法工具箱进行了计算机仿真。最后编制出了相应的电容调整优化策略程序并在AduC812单片机上运行,在SF960高频保护收发信机上进行实验,证实了此方案的有效性。

In this paper, the reason and the harmfulness of power line communication channel unmatched impedance are analyzed, and the importance of matched impedance is pointed out. A new method of adaption impedance matching for power line communication system is proposed. According to this new method, whether the impedance is matched can be estimated by real time detecting the sending electrical level of power line communication device to find out if it is the normal level. By using SCM, the variode is adjusted according to genetic algorithm optimization strategy enabling improved L type impedance network to match power line communication device. The feasibility and parameter adjustment of this system are studied. By using genetic algorithm and direct search toolbox of MATLAB, the computer simulation about optimization strategy is carded out. Finally, the genetic algorithm optimization strategy is programmed and run on the AduC812 SCM to control this adaption impedance matching system. By experimentizing on the SF960 high-frequency protection transmitter-receiver, it is substantiated that this new method of adaption impedance matching for power line communication system is effective.