An Overview on Islanding Detection for Distribution PV Power Generation

摘要

With the rapid development of photovoltaic (PV) power generation, it is increasingly important to perfect the grid-connection technology of distributed PV generations and to ensure the secure and stable operation of grid-connected PV generations. The anti-islanding protection of islanded PV generation is a necessary protection function of PV generation system. There are differences between the anti-islanding protection standard in China and those in the other countries. The anti-islanding detection standard in China is still imperfect. Based on theoretical basis of islanded PV generation, the non-detected zones (NDZ) of two islanding detection algorithms are derived. Also, by means of analyzing the relations between different islanding detection standards for distributed PV generation and corresponding non-detection zones, the protective thresholds of frequency and voltage are obtained. Passive, active and monitoring-based algorithms for islanding detection have been analyzed in literature. Their characteristics have been discussed as well.