一种新的主动孤岛检测法  

A new active island detection method based on a novel disturbance way

作　　者：张瑞叶[1] 张少如[1] 王平军[1] 王朋强 

机构地区：[1]河北师范大学物理科学与信息工程学院,河北石家庄050024 [2]天津工业大学电气工程与自动化学院,天津300387

出　　处：《电力系统保护与控制》2014年第15期74-79,共6页Power System Protection and Control

基　　金：河北省自然科学基金(E2013205173);河北省教育厅基金项目(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：孤岛的发生不仅会导致电力系统设备损坏,严重时还会出现威胁电力系统维修人员的生命安全等一系列问题。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。传统的AFD(Active Frequency Drift)检测方法在不同的负载下,检测效果不同,对纯阻性负载检测效果比较好。尽管科研工作者提出了基于反馈调节、周期性扰动的AFD法,可以减少THD,但同时减慢了检测速度。鉴于此,提出了一种基于新型的扰动方式的孤岛检测方案,比传统的AFD检测方法谐波低,盲区小,检测速度更快,具有很高的实用价值。Matlab/Simulink仿真以及实验结果表明,该方法比传统的AFD检测方法更具有优势。The happening of the island will bring people not only a serious security threat, but also a series of problems, like leading to a damage of system equipment. Therefore, photovoltaic grid power system must be equipped with the islanding detection function to ensure the safety of the power grid. The traditional AFD＇ detecting effects is different under different loads, and it＇s good for the impedance load. Although the improved AFD based on feedback adjustment or periodic disturbance proposed by former researchers can reduce the THD, the detecting speed slowed down at the same time. In view of this, this paper proposes a new active island detection method based on a novel perturbation way, it has the lower THD, the smaller blind area and the more faster detecting speed compared with the traditional AFD, so it has a high practical value. Matlab/Simulink simulation and the experiment results show that the new method is better than the traditional AFD.

关 键 词：并网光伏发电系统 孤岛 主动法 扰动 谐波 

分 类 号：TM615[电气工程—电力系统及自动化]