Impact of distributed generation on automatic load transfer devices operation
Distributed Generation (DG) is usually interconnected to distribution electric networks or facilities internal power supply network, where automatic load transfer (ATT) devices are widely used. The injection of generating power leads to a significant change of electric schemes and regimes, so DG can provide conditions when ALT failure to operate or resulting voltage collapse in the load node triggers an invalid operation of ALT. Characteristic areas of post-fault operation, for cases of ALT triggering on the fact of voltage drop, are defined in the article. These areas required to analyze at the planning of interconnection to existing electric grids. Recommendations for increasing the speed of response, changing the algorithms and the settings of the starting elements of ALT are summarized.