摘要
随着低压配电系统中非线性电力电子设备的普及,其产生的谐波成为近年来电网谐波的主要增长量。首先介绍了谐波的基本概念,通过2种电路仿真分析得到单相桥式整流电路交流测电流谐波均以3次谐波为主,三相桥式整流电路交流测电流谐波以5次谐波为主,所以在选择导体时需要考虑谐波的影响;其次探讨了谐波对导体的影响,分析了3次谐波影响下2种不同导线敷设方式截面积选择的原则;最后通过2个示例阐述了3次谐波影响下导体截面积选择的步骤与方法,为低压配电系统谐波治理提供一定参考。
With the popularity of nonlinear power electronic devices in low-voltage distribution systems,the harmonics generated by them have become the main growth of grid harmonics in recent years.Firstly,the basic concept of harmonics is introduced.Through two kinds of circuit simulation analysis,the harmonics of AC current measurement of single-phase bridge rectifier circuit is mainly the third harmonics.While the harmonics in the AC current measurement of three-phase bridge rectifier circuits is mainly the fifth harmon-ics,therefore,the influence of harmonics needs to be considered when selecting conductors.Secondly,the influence of harmonics on the conductor is discussed.The selection principle of cross-sectional area of two different wire laying methods under the influence of third harmonics is analyzed.Finally,the steps and methods of conductor cross-sectional area selection under the influence of third harmonics are described by two examples.
作者
郑俊观
张勇跃
刘静霞
王金焕
ZHENG Junguan;ZHANG Yongyue;LIU Jingxia;WANG Jinhuan(Department of Intelligent Manufacturing,Chengde Vocational College of Applied Technology,Chengde,Hebei 067060,China)
出处
《东北电力技术》
2023年第10期9-13,共5页
Northeast Electric Power Technology
