配电网电力线高频阻抗特性分析

配电网高频阻抗特性分析是当前电力载波研究的一个重要内容。该文从传输线理论出发,通过分析等效负载阻抗在复平面上的变化规律,讨论了3种典型连接形式的电力线高频阻抗特性;指出了在高频载波的条件下,传输线的策动点阻抗与负载阻抗特性变化的关系,为进一步讨论大规模配电网阻抗特性提供了分析方法。总结了电网参数对阻抗特性的影响,通过改变线缆参数和调制方法来减小传输线阻抗特性变化对载波通信的影响。

Analysis of power-line high frequency impedance characteristics

The analysis of the high frequency impedance in a distribution network is an important aspect of power-line communication. The high frequency impedance of the power line network band is first analyzed using transmission line theory. Analysis of the characteristics of the equivalent load impedance on the complex plane can determine the influence of the load impedance on the characteristics of the transmission line driving-point impedance. The analysis can be generalized for the cases of interconnected power lines and fork-connected power lines to provide a method to analyze the impedance of large-scale power networks. The results are used to analyze the network parameters' effect on the power-line impedance, and to develop measures to restrain impedance fluctuations. Strategies could be developed to reduce the influence of transmission network impedance fluctuations on the carrier.