基于PLC技术的配电网雷击信号检测系统设计

Design of Lightning Signal Detection System for Distribution Network Based on PLC Technology

为加强配电网在遭受雷击后的安全性,需要及时对雷击信号进行检测,该文设计了基于PLC技术的配电网雷击信号检测系统。构建系统总体架构,硬件设计,重点研究了供电电源模块和PLC指令控制模块;软件设计,通过构建输电线路模型,获取时域内的非线性等效输电方程,以无电晕与有电晕为指标得到等效模型内的总电容以及有电晕条件下的分电容,计算雷电冲击下电压值,选取参考点为坐标,计算雷电冲击下电流值,完成雷击信号检测。实验结果显示,设计系统可有效检测雷电冲击下配电网的电压和电流值,误差控制在2%以内,延时约为1μs,并可检测不同电位点的电位差,实现配电网全方位雷击信号检测。

In order to strengthen the safety of distribution network after lightning strike,it is necessary to detect the lightning strike signal in time.A lightning strike signal detection system based on PLC technology is designed.The overall architecture and hardware design of the system are constructed,and the power supply module and PLC command control module are mainly studied.In software design,the nonlinear equivalent transmission equation in time domain is obtained by constructing the transmission line model.The total capacitance in the equivalent model and the partial capacitance under corona conditions are obtained by taking corona free and corona free as indicators,and the voltage value under lightning impulse is calculated.The reference point is selected as the benchmark,and the current value under lightning impulse is calculated to complete the lightning signal detection.The experimental results show that the designed system can effectively detect the voltage and current of distribution network under lightning impulse,with the error controlled within 2% and the delay of about 1μs.And it can detect the potential difference of different potential points to realize the omni-directional lightning signal detection of distribution network.