新型低畸变扰动式孤岛检测法  

A New Active Island Detection Method Based on small distortion Disturbance Way

作　　者：张瑞叶[1] 张少如[1] 刘晓博[1] 刘玲玲[1] 王平军[1] 

机构地区：[1]河北师范大学物理科学与信息工程学院,石家庄050024

出　　处：《电力系统及其自动化学报》2016年第1期58-62,共5页Proceedings of the CSU-EPSA

基　　金：河北省自然科学基金资助项目(E2013205173);河北省教育厅基金资助项目(2009141);河北师范大学博士基金项目(L2008B04);硕士研究生科研基金项目(201202007)

摘　　要：由于孤岛的发生会产生很多危害,因此,光伏并网发电系统必须具备孤岛检测功能,以保证电网的安全运行。首先,对统的孤岛检测法—主动频率偏移法AFD(active frequency drift)及改进AFD法进行了研究,分析了它们的不足之处;然后从其扰动机理出发,提出了一种新型低畸变扰动式孤岛检测法。该方法采用了不同的注入谐波电流,检测速度快,输出波形的畸变更小,带来的谐波也更小。实验表明,该方法检测效果比传统的AFD法好,不仅检测盲区更小,检测速度更快,并且可以有效降低因扰动带来的谐波。Because the island will produce lots harm, the grid-connected photovohaicsystem must have islanding-detec- tion function to ensure its operating is safe. In this paper, the system of the island method-active frequency drift （AFD） method and improved AFD method are studied, and their shortcomings are analyzed, and a new active island detection method based on a novel disturbance way and the mechanism of disturbance is put forward. This paper adopts a difference injecting harmonic current, under this method, the detecting speed is faster, and the distortion of the current waveform is smaller, so that the harmonic is smaller. Experiment shows that its detection effects are better than traditional AFD, not only the detection blind area is much smaller, but also the detecting speed is much faster, and reduces the THD effectively.

关 键 词：并网光伏发电系统 孤岛 主动法 扰动方式 谐波 

分 类 号：TM615[电气工程—电力系统及自动化]