摘要
为了解决分布式发电系统中存在的孤岛检测问题,在总结已有孤岛检测方法不足之处的基础上,通过分析孤岛效应发生前后相关电量变化之比,提出了一种新型孤岛检测方法。该方法以频率变化和负荷功率变化之比ΔfΔPL为检测指标,通过将其计算值与所给的门槛值相比较来判定是否发生孤岛现象。为了验证所提方法的有效性,在考虑负荷突变对孤岛检测影响的基础上进行了仿真实验验证,仿真结果显示该方法既能快速、准确地检测出孤岛现象,又不影响电能质量。
In order to solve the islanding detection problem in distributed generation systems,by analyzing the ratio of some related power quantity before and after the islanding,a new islanding detection algorithm is proposed based on summarizing the shortcoming of traditional islanding detection methods. The value of Δ f ΔPLis regarded as detection index,and the islanding identification is realized by comparing the evaluated value with the given threshold value.Taking the impacts of local load change of grid on islanding detection into account,simulation study is made to validate the proposed method.The experimental results show that the proposed method is simple and feasible, can detect the islanding fast and accurately and does not affect power quality.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2010年第19期122-124,129,共4页
Power System Protection and Control
基金
河南省重点科技攻关项目(102102310041)
关键词
分布式发电
并网
逆变器
孤岛检测
仿真
distributed generation
grid-connected
inverter
islanding detection
simulation
