The Methods of Diesel Backup Generator Parallel Operation

Aug. 29, 2021

How to parallel diesel generator set? 1000kva diesel generator manufacturer answers for you!

 

Parallel operation of diesel generator sets refers to the use of two or more generator sets in parallel. The parallel operation of two or more generator units can meet the demand of load change and greatly reduce the operation cost of generator units. Therefore, there is more and more demand for parallel connection of generator units in the market.

 

Firstly, two generator sets connected in parallel shall meet the following four conditions.

 

1. The effective value and waveform of generator set voltage must be the same.

2. The voltage phases of the two generators are the same.

3. The frequency of two generator sets is the same.

4. The phase sequence of the two generator sets is consistent.


 Two generator parallel operation


Secondly, the quasi synchronous parallel method is common used in parallel operation.

 

Quasi synchronization is the exact period. For parallel operation with quasi synchronization method, the generator unit must have the same voltage, frequency and phase. These data can be obtained through the monitoring of the unit instrument panel.

 

Thirdly, if you want to use quasi synchronous parallel method, can refer to the bellow execution steps of quasi synchronous parallel method.

 

1. Close the load switch of one generator set and send the voltage to the bus, while the other unit is in standby state.

2. Close the beginning of the same period and adjust the speed of the generator set to be combined to make it equal to or close to the synchronous speed (the frequency difference with another unit is within half a cycle). 

3. Adjust the voltage of the generator set to be combined to make it close to the voltage of another generator set. When the frequency and voltage are similar, the rotation speed of the synchronization meter is slower and slower, and the synchronization indicator is on and off.

 

When the phase of the unit to be paralleled is the same as that of another unit, the pointer of the synchronization meter indicates the middle position upward, and the synchronization light is the darkest. When the phase difference between the unit to be combined and another unit is the largest, the synchronization meter points to the lower middle position, and the synchronization lamp is the brightest at this time. When the pointer of the synchronous meter rotates clockwise, it indicates that the frequency of the generator to be combined is higher than that of another unit, and the speed of the generator to be combined shall be reduced. On the contrary, when the pointer of the synchronous meter rotates counterclockwise, the speed of the generator set to be paralleled shall be increased.


4. When the pointer of the synchronization meter rotates slowly clockwise and the pointer approaches the synchronization point, close the circuit breaker of the unit to be paralleled immediately to make the two generator units parallel. Cut off the synchronization meter switch and relevant synchronization switches after parallel operation.

 

Finally, there are four advantages of parallel operation of diesel generator set.

1.Improve the reliability and continuity of power supply system. Because multiple units are connected in parallel into a power grid, the voltage and frequency of power supply are stable and can withstand the impact of large load changes.

2.More convenient maintenance. The parallel operation of multiple units can centrally dispatch, distribute active load and reactive load, and make maintenance and repair convenient and timely.

3.More economical. An appropriate number of small power units can be put into operation according to the size of the load, so as to reduce the waste of fuel and oil caused by the small load operation of high-power units.

4.According to the needs of expansion, the unit can meet the needs of load increase.

 

If you want to use power more flexibly and efficiently, you can consider the parallel operation of multiple generator sets by using parallel cabinet. For specific technical knowledge of parallel operation, you can call Dingbo power for consultation by +8613481024441. The generator set supplied by Dingbo Power adopts well-known engine brand, such Yuchai, Cummins, Volvo, Perkins and Weichai engines. Dingbo Power always provides power solutions to help your career. 

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