Patent ID: 7138728
Filing Date: 2006-11-21
Classification: H02J,H02M

Abstract:
1. An anti-islanding system for distributed power on a grid, comprising: a distributed power source operatively coupled to a grid and adapted with output current control, the distributed power source for providing power; a voltage sensor connected to a node between the distributed power source and the grid, and adapted to monitor grid voltage; a contactor operatively coupled between the distributed power source and the voltage sensor, and adapted for disconnecting the grid from the distributed power source; and an anti-islanding protection controller operatively coupled to the distributed power source and the voltage sensor, the anti-islanding protection controller adapted to request the distributed power source to selectively output a current pulse in the power being provided so as to cause a voltage deflection in the grid voltage if an island condition exists, and to detect an island condition based on voltage deflection data provided by the voltage sensor wherein the current pulse is requested by the anti-islanding protection controller according to a pre-defined routine depending on the voltage deflection data provided by the voltage sensor.