基于阻抗测量的分布式光伏孤岛检测方法  

Islanding detection method of distributed photovoltaic based on impedance measurement

作　　者：杨汾艳[1] 张跃[1] 刘洁[2] 尚德华[2] 曾杰[1] 于泷泽 

机构地区：[1]广东电网公司电力科学研究院,广州510080 [2]天津天大求实电力新技术股份有限公司,天津300384

出　　处：《电测与仪表》2015年第1期70-74,80,共6页Electrical Measurement & Instrumentation

摘　　要：针对分布式光伏并网点孤岛检测问题,提出了基于阻抗测量的分布式光伏主动孤岛检测方法,通过在并网点加入信号发生器,引入高频信号,主动判断系统阻抗变化,进行微网或光伏孤岛检测,优于目前通用的被动式孤岛检测算法,从而消除检测盲区。最后对主动孤岛检测算法进行仿真,分析可知基于阻抗的孤岛检测方法可有效规避检测盲区,提高孤岛产生时的电网运行安全性,且高频电压信号的引入对原有分布式光伏正常运行无明显影响。This paper proposed an active islanding detection method of distributed photovoltaic based on impedance measurement in order to solve the islanding detection problem at the internet access point of distributed photovoltaic. A signal generator was added at the network access point to draw in high frequency signals, the system impedance change was actively judged and islanding detection was made on the micro-grid or photovoltaic. This method is superi- or to the present passive islanding detection algorithm in that it can eliminate the detection dead area. Finally the ac- tive island detection algorithm was simulated, and the analysis showed that the islanding detection method based on impedance could effectively avoid the detection dead area and ensure the operating security of the grid during islan- ding, and the drawing-in of high frequency voltage signals had no obvious impact on the normal operation of the origi- nal distributed photovohaic.

关 键 词：阻抗测量 孤岛检测 高频信号 分布式光伏 谐振电路 

分 类 号：TM75[电气工程—电力系统及自动化]