分布式光伏接入配电网对电压影响的实验分析  

Experimental Analysis of the Voltage Impact of Distributed Photovoltaic Generation on Voltage in Distribution Network

作　　者：杨莉[1] 杨晓辉[1] 杨磊 聂佳 YANG Li;YANG Xiaohui;YANG Lei;NIE Jia(School of Information Engineering,Nanchang University,Nanchang 330031,China)

机构地区：[1]南昌大学信息工程学院

出　　处：《实验室研究与探索》2019年第10期19-24,共6页Research and Exploration In Laboratory

基　　金：国家自然科学基金项目(51765042,61463031,61662044,61773051);江西省教育厅教学改革项目(JXYJG-2017-02,JXJG-18-1-43)

摘　　要：分布式光伏接入配电网后,改变了正常运行时配电网中的潮流分布,使原来随潮流流向电压逐渐降低的模式发生改变,造成电压偏差超标等问题,限制了光伏发电的快速发展。首先结合配电网的运行条件和拓扑结构,在忽略了无功功率及线路电抗的条件下,提出了电压降落的简化分析模型,从理论角度分析得到光伏并网点位置、接入容量是影响配电网电压大小的主要因素,并进行了实验验算,得出的结论与理论分析一致。结果显示:光伏接入容量越大,接入位置越远离首端,对线路电压的提升也越大,末端集中接入光伏对电压的提升最大。After distributed photovoltaic generation is connected to distribution network,the flow distribution is changed from its normal operation. The original mode is decreasing gradually,and voltage becomes lower,resulting in voltage deviation exceeding the standard and other issues. This limits the rapid development of photovoltaic power generation.Firstly,the paper combines the operation conditions with the topological structure of the distribution network,under the condition of ignoring reactive power and line reactance,to propose a simplified analysis model of voltage drop. Then,from the theoretical point of view,it points out that the position of photovoltaic grid-connected point and access capacity are the main factors affecting the voltage of distribution network. Last, the theoretical analysis is verified by experiments,and the conclusions drawn from the experiment are consistent with the theoretical analysis. The results show that the larger the PV access capacity and the farther the access location are,the greater the line voltage increases.The terminal centralized access to photovoltaic leads to the greatest increase in voltage.

关 键 词：分布式光伏 电压偏差 配电网 并网点 

分 类 号：TM715[电气工程—电力系统及自动化]