直流配电网低压侧稳定燃弧阈值电压研究  

Study on Threshold Voltage for Stable Arcing by the Low Voltage Side of DC Distribution Line

作　　者：熊兰[1] 陈永辉 杨子康[1] 唐海龙 郭珂[1] Xiong Lan;Chen Yonghui;Yang Zikang;Tang Hailong;Guo Ke(State Key Laboratory of Power Transmission Equipment&System Security and New TechnologyChongqing University,Chongqing 400044 China;Zaozhuang Power Supply Company of State Grid Shandong Electric Power Company,Zaozhuang277000 China)

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400044 [2]国网山东省电力公司枣庄供电公司,枣庄277000

出　　处：《电工技术学报》2021年第19期4097-4106,共10页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51477021)。

摘　　要：分布式电源、电力电子技术以及直流负荷的大规模应用推动了直流配电网的发展,但直流电弧因没有过零点难以自行熄灭,严重威胁了直流配网的安全性。该文搭建了含直流低压母线(最大电压值380V)、电弧发生器与负荷的模拟实验平台,设计电弧实验以探究阻感负载下电弧的稳定燃烧点,以及阻性和感性负荷对燃弧过程和电弧特性的影响,得到了最大等效负荷(电阻280Ω、电感30mH)时直流电弧的稳定燃弧电压阈值。将电弧的伏安特性与电压平衡方程式相结合,对电弧稳定燃烧点和电弧燃炽时间进行理论推导,建立了低电压直流电弧的稳定燃弧阈值电压数学模型,并通过Matlab数值拟合方法验证了模型的准确性。该模型分析数据与实验数据的相关系数为0.9924,可以较好地反映低压阻感性负载稳定燃弧的电压阈值,为确定直流配电网的供电电压及低压直流电弧的稳定燃弧条件提供工程参考。The wide application of distributed generator,power electronic technology and DC load promote the development of DC distribution network.However,it is difficult to extinguish the DC arc without crossing the zero point,which seriously threatens the safety of DC distribution network.In this paper,a simulation experiment platform including DC low-voltage bus(with maximum value as 380V),are generator and load is built.The arcing experiment is designed to obtain the stable burning point of the arc under the resistive load and also the influence of the load on the arcing process and arc characteristics.The stable voltage source threshold value of arcing under the maximum equivalent load(resistance 280Ω,inductance 30mH)is obtained.Combining the volt-ampere characteristic of the arc with the voltage balance equation,the stable burning point and the burning time are theoretically deduced.The mathematical model of the threshold voltage of the stable burning DC arc is established,and the accuracy of the model is verified by the numerical fitting method with Matlab.The correlation coefficient obtained from both the model and the experiment is 0.9924,which means the model may determine the voltage threshold of stable arc with low voltage inductive load,and provide engineering reference for determining the rating power supply voltage of DC distribution network and stable arcing condition of low voltage DC arc.

关 键 词：直流电弧 直流配电网 燃弧条件 电弧特性 阈值电压 

分 类 号：TM501.2[电气工程—电器]