偏远地区风电场的并网谐振现象分析  

Analysis on Grid-Connected Resonance of Wind Farm in Remote Areas

作　　者：唐振东[1] 杨洪耕[1] 马晓阳[1] 谭洋洋[1] 

机构地区：[1]四川大学电气信息学院,四川省成都市610065

出　　处：《电网技术》2016年第5期1415-1421,共7页Power System Technology

摘　　要：针对风电场易发生的由并网谐振现象引起的LCL滤波器滤波电阻烧坏事故,提出基于元件灵敏度的模态分析法进行研究。偏远地区风电场的并网系统电网结构薄弱,且其送出线较长,输电线路对地分布电容造成的影响不容忽视。建立长线路分布参数模型,并对其等效输入阻抗幅频特性给予分析,基于此,采用模态分析法分析风电场并网系统各节点谐振参与因子以及元件灵敏度值。最后,依据风电场实际参数建模仿真,与实测数据对比验证了模态分析结果的正确性,通过元件灵敏度概念的引入揭示线路长度对偏远风电场并网谐振的影响规律,在风电场建设规划时应予以重视。Aiming at LCL filter resistance burning accident easily caused by grid-connected resonance of wind farms,a modal analysis method based on element resonance sensitivity was put forward.Grid structure of grid-connected system is weak in remote areas,and its transmission line is usually quite long.Influence of distributed capacitances of long lines should not be ignored.Distributed parameter model of transmission line was established,and its impedance characteristics were analyzed.Then modal analysis method was used to analyze resonance participation factor of every node and every element＇s sensitivity of wind farm grid-connected system.Finally,simulation model based on actual parameters of a wind farm was constructed.Compared with measured data,correctness of modal analysis results was verified.By introducing element sensitivity concept,the principle that transmission line length has influence on grid-connected resonance is revealed,and the problems mentioned should be paid much attention to for construction and planning of wind farms.

关 键 词：模态分析 偏远风电场 并网谐振 分布参数模型 元件灵敏度 

分 类 号：TM721[电气工程—电力系统及自动化]