Diesel generator set is the most commonly used standby power supply. Diesel generating units are widely used in factories, enterprises and other areas. The flexibility of power supply can be effectively improved by automatically combining two or more diesel generating units to supply power back to the load.
Principle of Parallel Diesel Generator Set
When the load is less than 60% (adjustable) of the rated capacity of a single unit, the system will send out a "cut-off" signal and release of standby units. If the load is more than 80% (adjustable) of the rated capacity of a single unit, the system will out a automatically "boost instruction" signal and start the standby unit to realize automatic parallel machine, automatic equalization of active load.
Condition of Parallel Diesel Generator Set
Before parallel operation, it is necessary to check whether parallel generator is suitable for the following conditions:
1. The grid-connected units should have the same phase sequence.
2. The grid-connected units should have the same voltage.
3. The grid-connected should have the same or very close frequency and phase.
If any of the above conditions are not satisfied, there will be a differential voltage at both ends of the switch. If the switch is closed, the transient impulse current will inevitably appear in the circuit composed of generator and generator. Except for the absolute condition of phase sequence, other conditions are relative, because usually the motor can withstand some small impulse current.
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