光伏并网对电力系统低频振荡阻尼特性的影响分析  

Analysis of Influence of Photovoltaic Grid Connected on Damping Characteristics of Low Frequency Oscillations in Power System

作　　者：唐枫 张友刚[1] TANG Feng;ZHANG Yougang(Southwest Jiaotong University,Chengdu 611756,China)

机构地区：[1]西南交通大学,四川成都611756

出　　处：《电工技术》2021年第18期52-56,共5页Electric Engineering

摘　　要：日益增长的光伏装机容量和光伏发电比重让电力系统运行稳定性面临新的挑战。从系统阻尼特性角度出发,针对光伏并网对电力系统低频振荡阻尼特性的影响展开研究。首先综合考虑光伏阵列、逆变器及其控制策略等部分,建立光伏发电系统动态模型,并基于DIgSILENT/PowerFactory仿真平台分别搭建含光伏发电系统接入的四机二区域系统和IEEE 16机68节点系统,采用特征值分析法和时域仿真法研究光伏发电系统的并网点、渗透率、入网输送距离等因素对电力系统低频振荡阻尼特性的影响。结果表明,光伏发电系统不会增加电力系统低频振荡模式,也不会直接影响系统阻尼特性,而是通过改变系统潮流来改变系统阻尼特性的,并且光伏并网总能改善本地局部振荡的阻尼特性,但对区间振荡模式而言,其影响或正或负。With the increasing installed capacity and proportion of photovoltaic power generation,the stability of system is facing new challenges.From the perspective of system damping characteristics,the impact of photovoltaic grid-connection on damping characteristics of low frequency oscillation in power system are studied in this paper.Firstly,considering the photovoltaic array,inverter and its control strategy,the dynamic model of photovoltaic power generation system is established.The IEEE 16-machine 68-bus system including photovoltaic power generation system are built based on DIgSILENT/PowerFactory simulation platform.The eigenvalue analysis method and time domain simulation method are used to study the influence of factors such as the grid connection point,the penetration rate,and the transmission distance of the photovoltaic power generation system on the damping characteristics of low-frequency oscillation in power system.The results show that the photovoltaic power generation system will not increase the low-frequency oscillation mode of the power system,nor will it directly affect the damping characteristics of the system,but change the damping characteristics of the system by changing the power flow of the system.In addition,grid-connected photovoltaics can always improve the damping characteristics of local partial oscillations,but for the interval oscillation mode,its influence can be positive or negative.

关 键 词：光伏并网 低频振荡 阻尼特性 特征值分析 

分 类 号：TM615[电气工程—电力系统及自动化]