标题：Composite Islanding Detection Method Based on the Active Frequency Drift and Voltage Amplitude Variation
作者：Li, Ying; Hou, Meiyi; Feng, Han; Liu, Xincai
作者机构：[Li, Ying; Hou, Meiyi; Feng, Han] Shandong Univ, Sch Elect Engn, Jinan 250061, Shandong, Peoples R China.; [Liu, Xincai] Shandong Polytech, Jinan 25 更多
会议名称：IEEE PES Asia-Pacific Power and Energy Engineering Conference (IEEE PES APPEEC)
会议日期：DEC 07-10, 2014
来源：2014 IEEE PES ASIA-PACIFIC POWER AND ENERGY ENGINEERING CONFERENCE (IEEE PES APPEEC)
关键词：composite islanding detection; active frequency drift; voltage amplitude; variation; power matching; power quality
摘要：Efficient and reliable islanding detection method is essential for the grid-connected photovoltaic systems. In spite of a high detection efficiency, the active frequency drift (AFD) method cannot identify the islanding in the case of power matching and is limited by the amount of total harmonic distortion (THD) injected into the grid. To cope with the above problems, a novel composite islanding detection method based on the change of both voltage frequency and amplitude is proposed, which is divided into dominant and auxiliary detection in accordance with active frequency drift and amplitude variation respectively. Simultaneously the assignment way of chopping fraction is improved to further reduce current harmonic distortion. The results derived from Matlab simulation indicate that it not only can largely narrow the non-detection zone of AFD method, especially the most difficult condition of islanding detection, but also significantly diminish the harmonic impact on the grid.