What is the drawback of islanded generators during a separation event?

Islanded generators are generators that are disconnected from the main power grid but still continue to operate independently. During a separation event, one significant drawback is that they can inadvertently provide power to their auxiliary load.

When a generator becomes islanded, it may still supply power to its local facilities, including essential auxiliary loads necessary for safe operation. However, if the generator is not appropriately managed or if it does not have control measures in place, it may continue to operate without the synchronization that normally exists when connected to the grid. This can result in the generator powering loads that it was not intended to supply if it loses grid support or experiences changes in load demand that exceed its capabilities.

Moreover, without the balancing grid, the generator’s outputs can lead to frequency and voltage instability. This condition puts the generator and connected loads at risk, and if not corrected, it could result in damage or exacerbation of operational issues. Thus, the unintended power supply to auxiliary loads highlights a critical operational concern for islanded generators during separation events, as they may not effectively manage the load without the guidance provided by a connected grid.