偏远地区风电场并网系统串联谐振分析  

Series Resonance Analysis on Grid-connected System of Wind Farm in Remote Areas

作　　者：唐振东[1] 杨洪耕[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：《电力系统自动化》2016年第15期120-125,共6页Automation of Electric Power Systems

摘　　要：针对偏远风电场并网时易被忽略的并网系统串联谐振问题,提出结合回路元件灵敏度的串联谐振模态分析法进行研究。虽然并联谐振在电力系统中所占比例较大,但串联谐振的危害亦不可忽略。偏远风电场因其送出线较长,并网结构薄弱,输电线路分布电容所带来的影响不容忽视。建立线路分布参数模型,并分析其阻抗特性,基于已建立的风电场并网模型,采用串联谐振模态分析法分析系统串联谐振现象,准确判断串联谐振频率的同时,给出串联回路电气元件的模态灵敏度值。最后,以某风电场为实例建立仿真模型,仿真结果验证了所采用分析方法的可行性。通过元件灵敏度值的计算,进一步阐述线路长度的改变对风电场并网系统串联谐振频率和幅值的影响规律,为风电场实际规划建设提供理论指导。In view of the series resonance problem apt to be neglected when the remote wind farm is connected to the grid,a method by referring to modal analysis and dummy branch is used for analysis.Because of the long sending line of the remote wind farm,the grid structure is relatively weak and the influence of the distribution parameter of the transmission line cannot be ignored.A distributed parameter model of transmission line is built and the impedance characteristics are analyzed.Based on the grid-connected wind farm model developed,the method by combining modal analysis with dummy branch is used to analyze the system series resonance phenomenon.Series resonance frequency is accurately judged.Meanwhile,the modal sensitivity values of the electrical elements of the system are given.Finally,a simulation model is set up by taking a wind farm as an example.The feasibility of the method used is verified by simulation results.The influence of the change in line length on the series resonance of the wind farm grid-connected system is expounded by the calculation of the element sensitivity,providing a theoretical basis for the actual construction of the wind farm.

关 键 词：串联谐振 偏远风电场 并网逆变器 模态分析 元件灵敏度 

分 类 号：TM614[电气工程—电力系统及自动化]