基于BLT方程的中压电力线载波通信信道建模

中压电力线载波信道呈现较强的频率选择性,为分析预测这种选择性,提出了基于BLT方程的中压电力线载波通信信道模型。从常见的描述单一负载电压响应的BLT方程出发,通过分析载波信号在复杂网络中的传播特性,得出了适用于中压电力线载波通信网络的信道模型。该模型不受具体网络拓扑的限制,可以将网络中各节点处的电压响应特性表示为管道传播矩阵和节点散射矩阵的函数,具有形式简洁,通用性强,便于分析计算的特点。最后,以由架空线构成的中压配电网为例,用所提的方法计算了在窄带范围(10~500kHz)内节点电压的幅频特性和相频特性,并通过在PSpice中用集总参数元件进行模拟的方法验证了模型的可信性。

BLT Equation Based Channel Modeling for Medium-voltage Power Line Carrier Communication

The medium voltage power line carrier channel exhibits strong frequency selectivity. In order to analyze and predict this selectivity, this paper proposes a channel model for power line carrier communication based on the BLT equation. Combining the common BLT equation describing a single load voltage response, the channel model is deduced by analyzing the propagation characteristics of the carrier signal in the complex network. Without the limitation of specific network topology, this model can express the voltage response characteristic at each node in the network as a function of the pipe propagation matrix and the node scattering matrix. It has the advantages of simple form, strong versatility, and easy analysis and calculation. Finally, taking the medium-voltage distribution network consisting of overhead lines as an example, the voltage amplitude-frequency and phase-frequency characteristics at each node are calculated by using the proposed method. And the correctness of the model is verified by simulation with lumped parameter component in PSpice.