Field test results of power-line signaling based anti-islanding scheme

The capability of anti-islanding protection is a very important requirement for distributed generators (DG). A power line signaling based scheme for anti-islanding protection has been proposed in a companion paper. In the scheme, a signal generated by power electronics is injected from a central upstream location to the DG sites. The lack of a signal at the DG site indicates that the DG is islanded. This paper is a summarization of extensive field test for the proposal. Two proposed detection algorithms have been verified, the impact of firing angles on signal strength have been determined and the effect of power system frequency drift have been analyzed. The test results proved that the proposed scheme is promising for the anti-islanding protection of distributed generator.