Logical Relationship Between High Voltage Diesel Generator Set And Mains Power

I. Self starting logic.

When the control system of diesel generator set receives the command of mains power failure, phase failure or external emergency startup, the startup mode shall be set according to the total load base.

1. Priority is given to entering the power management mode.

All diesel generator sets receive the starting signal, start the diesel generator set, and send the closing command when the rated speed is reached and the voltage is established. At the same time, open the incoming line switch at the mains terminal, identify the power according to the load, start the units in the capacity reserve for parallel loading, increase the number of parallel units according to the operation reserve identification, and reduce the number of parallel units according to the shutdown reserve identification.

2. Set the maximum total load base.

All diesel generator sets receive the starting signal, start the diesel generator set, and send the closing command when the rated speed is reached and the voltage is established. At the same time, switch off the incoming line switch at the mains terminal, all generator sets are parallel loaded, set the time for power management, conduct power management when the time is up, and reduce the total number of online units by load identification according to the shutdown reserve setting value.

II. Switching logic for mains power recovery.

When the mains power is restored, the ATS transfer switch will immediately switch to the mains power supply after receiving the mains power signal, and each unit will conduct soft unloading and cooling shutdown according to the procedure. After the mains power is restored, if the mains power fails during the cooling process of the generator set group, the generator set will immediately enter the backup mode to ensure the reliability of power supply.

III. Parallel logic.

After the # 1 generator set is started and loaded successfully, if the load increases to the rated power setting value of # 1 diesel unit, the control system of # 1 unit will send a start command to # 2 unit. After the # 2 unit is started successfully, under the control of # 2 unit control system, the frequency and phase multiple pull in synchronization will be automatically adjusted, the closing command will be issued, and the unit will be put into parallel operation. After Unit 2 is put into parallel operation, the startup command is also sent to the subsequent units. Until the unit with capacity meeting all load requirements is put into operation. If the load decreases continuously, when it is reduced to the set value of the rated power of the last parallel unit, the load will be transferred to the previous unit under the control system of the last unit. When the last unit is close to no-load, the unit's injection switch will be opened to realize soft unloading and disconnection, and so on.

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