改善的主动频率偏移法在光伏并网孤岛检测中的应用  

Application of improved active frequency drift method to photovoltaic grid islanding detection

作　　者：张佑鹏 邵如平[1] 杨波[1] 

机构地区：[1]南京工业大学自动化与电气工程学院,南京210009

出　　处：《电测与仪表》2015年第6期27-32,共6页Electrical Measurement & Instrumentation

基　　金：国家自然科学基金资助项目(510770101);吉林省教育厅资助项目(吉教2010第473号)

摘　　要：为了能够改善光伏并网孤岛检测效率和提高输出电能质量两者兼顾的问题,考虑到检测盲区,文章介绍了传统的主动式频率正向偏移法的实现过程,并分析了其特点及存在的缺点,从而提出了改善的反复性正反馈主动频率偏移法,引入符号函数对截断系数进行整定,不同负载下保障频率扰动方向可靠性,因此能够高效的检测出孤岛现象,降低了检测盲区和总谐波,改善了光伏逆变系统的输出电能质量。仿真及逻辑分析表明,该算法能够及时、准确的检测出电网的故障。In order to improve the efficiency of islanding detection of photovoltaic grid and power quality,the implementation process of the traditional active frequency drift method and its characteristics and the shortcomings are introduced in the paper in view of the blind spot of detection.Thus an improved repeatable positive feedback the active frequency drift method is proposed,the symbolic function is introduced to adjust the truncates coefficients,and the frequency perturbations reliability is secured under different load directions.So it can efficiently detect islanding,reduce blind spot of detection and total harmonic and improve output power quality of PV inverter systems.Its simulation and logic analysis show that the algorithm can promptly and accurately detect the failure of the power grid.

关 键 词：光伏并网 孤岛效应检测 反复性正反馈 符号函数 

分 类 号：TM773[电气工程—电力系统及自动化]