摘要
孤岛检测是分布式发电并网研究的难点,特别是在逆变器输出与负载功率平衡时难以检测出孤岛。频率或相位偏移等主动检测方法向电网注入谐波,而且在逆变器输出与负载相位匹配时孤岛检测失效。本文提出了一种新的孤岛检测方法——主动电流扰动法。该方法不影响电网的频率,不向电网注入谐波,而且在单台运行时不存在不可检测区,仿真和实验结果验证了该方法的正确性。
It is difficult to detect islanding in distributed generation research, especially when power balance between the output of inverter and the load. Frequency or phase shift methods which inject harmonic into grid is ineffective when phase match between the output of inverter and the load. A new method for islanding detection based on active current disturbing is proposed in this paper. This method doesn＇t effect the frequency of grid, inject harmonic to grid and have non detection zone when operating alone. This method has been proved by simulations and experiments.
出处
《电工技术学报》
EI
CSCD
北大核心
2007年第7期176-180,共5页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(50477022)
关键词
并网逆变器
孤岛检测
主动电流扰动法
Grid-connected inverter, islanding detection, active current disturbing
