摘要
在分析传统的主动频率偏移(AFD)法基础上,提出一种适时施加脉冲式电流幅值干扰的组合式改进方法,重点讨论幅值干扰施加的方式,特别是施加时间的选取。采用该方法,并结合被动检测法中的过/欠压保护、过/欠频保护进行孤岛检测的仿真计算,结果表明,所提出的方法可克服传统AFD法或电流幅值干扰法单独使用时存在的缺点,能快速准确检测出孤岛效应的发生,实现在高速自动重合闸动作之前停止逆变器的并网运行,具有对电网谐波影响小、检测盲区小的优点。
On the basis of traditional active frequency drift （AFD） method, an improved islanding detection method is presented adopting the pulse current amplitude disturbance. The method to inject the current amplitude disturbance is introduced, especially the method to choose disturbance time. The islanding detection is simulated in combination with over-voltage protection /under-voltage protection （OVP/UVP） and over-frequency protection /under-frequency protection （OFP/UFP）. The results show that the combined method overcomes the problems associated with AFD or the current disturbing method. Islanding occurrence can be detected effectively with the presented method, and the photovoltaic system can be disconnected from the system before high-speed auto reclosing, with limited harmonics and reduced non-detection zone.
出处
《电力系统自动化》
EI
CSCD
北大核心
2009年第23期85-89,共5页
Automation of Electric Power Systems
基金
江苏省国际科技合作项目(BZ2007033)
关键词
孤岛
主动频率偏移(AFD)
电流幅值干扰
谐波
盲区
islanding
active frequency drift（AFD）
current amplitude disturbing
harmonics
non-detection zone
