基于相位偏移的主动移频式孤岛检测方法

Active frequency drift islanding detection method based on phase jump

针对传统过压/欠压、过频/欠频、相位突变、主动频率偏移孤岛检测方法的不足,提出了一种改进方法。将相位偏移量作为辅助量加入主动移频孤岛检测方法中,使检测容性负载的孤岛现象具有与感性负载同样的快速性,并能有效降低主动频率偏移法对电网电能的影响。该方法实现简单,检测快速,仿真结果验证了其快速性和有效性。

Considering the disadvantages of the traditional over /under voltage ,over/under frequency detection, phase jump detection and active frequency drift detection, this paper introduces an improve method, which add the phase offset as a supplementary into active frequency drift islanding detection method, so that the islanding detection of capacitive load and inductive load has the same rapidity, and can reduce the impact of electricity on the grid effectively. The method is simple and can detect the island- ing fast. The simulation results show that the proposed islanding detection method is effective and practical.