冲击性负荷对“双高”电网暂态电压影响的研究  

Research on the Impact of Shock Load on Transient Voltage of“Double High”Power Grid

作　　者：康定毅 崔荣喜 杨小婷 谭亲跃[1] 庞博文 尚文强 KANG Dingyi;CUI Rongxi;YANG Xiaoting;TAN Qinyue;PANG Bowen;SHANG Wenqiang(College of Water Resources and Architectural Engineering Northwest A&F University,Yangling 712100,China;Rizhao Power Supply Bureau of State Grid Shandong Electric Power Company,Rizhao 276800,China)

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100 [2]国网山东省电力公司日照供电公司,山东日照276800

出　　处：《电工技术》2023年第16期83-87,共5页Electric Engineering

基　　金：国家电网公司总部科技项目(编号5400-202216167A-1-1-ZN)。

摘　　要：随着可再生能源发电规模的不断扩大,电力系统呈现出了高比例新能源、高比例电力电子装置的“双高”特性。随着大量冲击性负荷的接入,电网电压波动、谐波等问题愈加明显,加之电力系统“双高”特性,这些因素会给“双高”电网电能质量带来很大隐患。对此,建立了以并网型光伏发电系统为主的“双高”电网,以交流电弧炉为典型冲击性负荷,分析电弧炉三相短路对“双高”电网造成的电压暂降问题。仿真结果表明,电弧炉三相短路时,0.02 s内,无功冲击是正常运行时的5倍,短路电流是正常运行时的5.24倍,35 kV并网点相电压有效值下降了29.19%,引起了明显的电压暂降。With the continuous expansion of renewable energy generation,the power system presents the"double high"characteristics of a high proportion of new energy and a high proportion of power electronic devices.With the access of a large number of shock loads,grid voltage fluctuations,harmonics,and other issues becoming more and more obvious.Coupled with the"double high"characteristics of the power system,these factors will bring great hidden dangers to the double high'power quality.In this paper,a"double high"power grid based on a grid-connected photovoltaic power generation system is established.Taking an AC arc furnace as a typical impact load,the voltage sag caused by the three-phase short circuit of the arc furnace to a"double high"power grid is analyzed.The simulation results show that when the three-phase short-circuit of the electric arc furnace is 0.02 s,the reactive power impact is 5 times that of the normal operation,the short-circuit current is 5.24 times that of the normal operation,and the effective value of the phase voltage of the 35 kV grid-connected point is reduced by 29.19%,causing obvious voltage sag.

关 键 词：冲击性负荷 “双高”电网 电压暂降 电弧炉 

分 类 号：TM743[电气工程—电力系统及自动化]