Operating Procedure with Generators with External Generator Control
Event or state | Result | Internal transfer relay |
|---|---|---|
The generator management system requests the generator. | The Sunny Island signalizes to the external generator control that the generator has been requested. | Open, the stand-alone grid is not connected to the generator. |
The external generator control starts the generator. | The generator voltage builds up. | |
The warm-up time set at the external generator control begins. | The generator management system measures the time until the external generator control signals to the Sunny Island that the warm-up time has expired. If a maximum time is exceeded, the generator management system terminates the generator start. | |
The external generator control signalizes to the Sunny Island that its warm-up time has successfully expired. | ||
The Sunny Island synchronizes the stand-alone grid with the generator voltage. | – | |
The stand-alone grid is synchronized. | The Sunny Island connects the stand-alone grid to the generator. | Closed, the stand-alone grid is connected to the generator. |
The stand-alone grid is connected to the generator. | The generator feeds current into the stand-alone grid. | |
The generator management system starts the minimum run time. | ||
The minimum run time is running. | Even if the generator management system no longer requests the generator, the stand-alone grid remains connected to the generator. | |
The minimum run time ends. | If the generator management system continues to request the generator, the stand-alone grid remains connected to the generator. | |
The generator management system no longer requests the generator. | The Sunny Island supplies the stand-alone grid and carries out load-free disconnection of the generator from the stand-alone grid. | Open, the stand-alone grid is not connected to the generator. |
The generator management system signalizes to the external generator control that the generator is no longer being requested. | ||
The power-down time set at the generator management system begins. | – | |
The power-down time is running. | During the power-down time, the generator management system cannot request the generator again and the Sunny Island cannot reconnect the stand-alone grid to the generator. | |
The power-down time ends. | The external generator control stops the generator. | |
The external generator control signalizes to the Sunny Island that its power-down time has expired. | ||
The generator management system starts the minimum stop time. | – | |
The minimum stop time is running. | The Sunny Island suppresses every generator request. It is also not possible to perform a manual start at the Sunny Island. | |
The minimum stop time ends. | The generator management system can request the generator. | |
The generator can be started at the Sunny Island. |