How To Operate Generator In Island Mode

I. Definition of Islanded Operation Mode

The Islanded Operation Mode (also known as "Island Mode") of a diesel generator set refers to an operating state where the generator set supplies power to a specific load or area independently after being disconnected from the public power grid. In this mode, the generator set operates completely independently. It is typically used to ensure the continuous power supply of critical facilities during a mains power failure, such as hospitals, data centers, factories, etc.

II. Working Principle of Islanded Operation Mode

Under normal conditions, a diesel generator set usually operates in parallel with the public grid, providing backup power. When a mains power failure occurs, the generator set automatically switches to islanded operation mode to ensure independent power supply to the system. This process mainly includes the following steps:

Detecting Mains Power Failure: The diesel generator set monitors the mains power input. When abnormalities in voltage or frequency are detected, it automatically initiates island mode.

Disconnecting from the Grid: Once the mains failure is confirmed, the generator set disconnects from the grid through an automatic transfer switch (ATS) to prevent back-feeding electricity into the grid, ensuring safety.

Independent Power Supply: The generator set begins supplying power to the load independently. The system automatically adjusts the generator's output to maintain stable voltage and frequency.

Restoring Grid Connection: When mains power returns to normal, the generator set resynchronizes with the grid through an automatic synchronization device, gradually reducing its output power until it completely stops.