中压配电网无功补偿装置对PLC信道特性的影响分析

Analysis of PLC channel characteristics of reactive power compensation equipment in medium-voltage distribution network

分析中压配电网无功补偿装置对PLC信道特性影响规律,为实现PLC在中压配电网中的应用提供必要的理论基础和参考依据。通过对中压配电网现有无功补偿方式及常见补偿装置的分析,指明经配电变压器接入中压配电网的低压集中补偿和用户终端分散补偿的无功装置对中压侧PLC信道特性影响可忽略不计。故在中压配电网PLC信道模型基础上,重点分析变电站集中补偿和杆上无功分散补偿两种方式下,无功补偿装置的数量、补偿容量、补偿位置等因素对载波信号的传输特性和输入阻抗的影响规律。研究结果表明:若无功补偿装置直接接入补偿点,则电压衰减的幅度随着补偿容量、补偿点数量的增加而增大,与补偿位置基本无关;若无功补偿装置经一定长度的电缆接入补偿点,则以上各因素对电压衰落的影响可忽略不计。

This paper analyzes the effect law of reactive power compensation device in medium voltage distribution network to PLC channel characteristics, in order to achieve application of PLC to provide the theoretical basis and reference. The analysis of medium voltage distribution network existing compensation mode and compensation device indicates that the distribution transformer low-voltage centralized compensation and the user terminal dispersion compensation of reactive power device for medium voltage PLC channel characteristics influence can be ignored. On the analysis of substation centralized compensation and reactive on dispersion compensation in two ways, it focuses number of reactive power compensation equipment, capacity, compensation position on the influence of carrier signal transmission characteristics and input impedance. The results of the study indicate if there is compensation device is accessed to compensation point directly, voltage attenuation amplitude increases with the compensation capacity and the number of compensation point increase, and largely independent of position compensation; if the reactive compensation device is connected to the compensation point after a certain length of cable, the influence of the above factors on the voltage decline is negligible.