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提出了一种基于支路追加法的中压配电网混联线路的电力线载波通信信道建模方法。根据配电网拓扑结构,利用支路追加法,逐一追加网络各条支路,列写该支路的伏安特性独立方程和基尔霍夫定律电流方程,生成一组具有唯一解的网络矩阵方程。通过该矩阵方程中各未知变量的比值关系,求解信号的传输函数,分析信道的传输特性。当配电网网络结构发生改变时,只需在原代数矩阵方程基础上,增减矩阵中的相关行与列即可得修改后的新矩阵方程。该建模方法原理清晰,运算量小,适用于树形网络、手拉手网络及环网等各种拓扑结构。仿真及实验测试验证了所提方法的正确性。
A modeling method of power line carrier communication channel for hybrid power lines in medium voltage power distribution networks based on branch addition is proposed. According to the topology of distribution network, by using the branch addition method, each branch of the network is added one by one, and the independent equations of volt-ampere characteristics and Kirchhoff’s law of current of the branch are listed to generate a set of network matrices with unique solutions equation. Through the relationship between the ratio of unknown variables in the matrix equation, the signal transfer function is solved and the transmission characteristics of the channel are analyzed. When the network structure of the distribution network is changed, the new matrix equation after modification can be obtained by simply adding and subtracting the relevant rows and columns in the matrix based on the algebraic matrix equation. The modeling method has clear principle and small amount of operation, and is suitable for various topologies such as tree network, hand in hand network and ring network. Simulation and experimental tests verify the correctness of the proposed method.