What are the benefits of combining generator sets?

Parallel operation of generator sets refers to the parallel operation of two or more diesel generator units of the same or different power to meet higher power demands or provide redundant backup. The output cables of the parallel generator set will be connected to a single electrical bus to form a unified power supply system. This technology not only improves the reliability and continuity of the power supply system, but also enables flexible adjustment of power output.

1、 The purpose of parallel operation of generator sets
Improving power supply reliability: When a generator set fails, other units can continue to supply power without causing a power outage to the entire system, thus ensuring the continuous operation of important loads.

Increasing power supply capacity: By merging multiple generator sets, their capacities can be combined to meet the demands of larger loads. For example, in some large factories, shopping malls, hospitals and other places where electricity consumption is high, a single generator set may not be able to meet the demand, and in this case, parallel operation is needed.
Improving operational efficiency: When the load is low, only one generator unit can be started, avoiding energy waste caused by multiple units running simultaneously. When the load increases, gradually start other units to improve energy utilization efficiency.

2、 Conditions for parallel operation of generator sets
The model, specifications, and parameters of the generator set should be the same or similar, including engine power, speed, fuel consumption rate, generator capacity, voltage, frequency, phase sequence, etc. Only generator sets with similar parameters can achieve good parallel operation, otherwise problems such as uneven power distribution and excessive circulating current may occur.

The speed regulation characteristics and voltage regulation characteristics of the generator set should be consistent: the speed regulation characteristics refer to the ability of the engine to automatically adjust the speed and maintain stable output frequency when the load changes. The voltage regulation characteristic refers to the ability of a generator to automatically adjust the output voltage and maintain voltage stability when the load changes. If the speed regulation characteristics and voltage regulation characteristics are not consistent, it will lead to uneven power distribution and voltage fluctuations among the generator sets after parallel operation.

The phase sequence of the generator set should be consistent: phase sequence refers to the phase sequence of three-phase alternating current. If the phase sequence is not consistent, it can cause serious problems such as short circuits, circulating currents, and even damage to the equipment between the parallel generator sets. Therefore, before parallel operation, it is necessary to ensure that the phase sequence of each generator set is consistent.

More information on generator sets：https://huaquanpower.com/