Development tendency of positive feedback type anti-islanding of American companies

There are some schemes for detecting an islanding condition in a grid, such as “passive methods”, “active methods”, and other schemes. In an active anti-islanding scheme, a small amount of reactive power is continuously fed by the power conversion system and causes the power conversion system to be shut down upon an islanding condition. In this paper, it is introduced the development tendency of positive feedback type anti-islanding of American companies to overcome the shortage of the active scheme.