Operation of dispersed generation (DG) connected to the distribution network presents several difficulties for a reliable and safe operation of the power system. Among these, protection against islanding appears to be the most challenging aspect to be ensured in order to allow DG a large diffusion. In this paper the main protection techniques presently employed have been analysed and a systematic investigation has been carried out on systems connecting different generation units in order to identify the operating conditions which may lead these protections failing to detect the isolation of generator site from utility supply. For situations presenting high likelihood of failing the islanding detection, some methods for improving reliability are proposed.
Grid-connected dispersed generation: investigation on anti-island protections behaviour
CALDON, ROBERTO;TURRI, ROBERTO
2001
Abstract
Operation of dispersed generation (DG) connected to the distribution network presents several difficulties for a reliable and safe operation of the power system. Among these, protection against islanding appears to be the most challenging aspect to be ensured in order to allow DG a large diffusion. In this paper the main protection techniques presently employed have been analysed and a systematic investigation has been carried out on systems connecting different generation units in order to identify the operating conditions which may lead these protections failing to detect the isolation of generator site from utility supply. For situations presenting high likelihood of failing the islanding detection, some methods for improving reliability are proposed.
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