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Briefly Describe The Selection Of Diesel Generator Sets In Data Centers

Mar. 10, 2022

Power supply is the basic guarantee for the normal operation of data center IT equipment. Once a power supply failure occurs in the data center, business systems will be down and data will be lost. Therefore, the backup power supply is one of the indispensable and important equipment in the data center.


Diesel generator set is one of the backup power sources widely used in data centers. In the event of an emergency in the normal power supply, the UPS or high-voltage DC backup battery in the data center will enter the discharge mode to ensure the continuity of IT equipment power supply. At the same time, the backup power source of the data center diesel generator set will start up quickly and complete the parallel operation to carry the electricity load required for the normal operation of the entire data center.


In this paper, Jiangsu Starlight Electricity Equipments Co.,Ltd. briefly summarizes the factors that need to be considered in the selection of diesel generators based on the characteristics of data center load power requirements. The summary is as follows.


I. Characteristics of data center loads and their power requirements.


1. Data center load characteristics.

High load level: The business continuity requirements are very high, and the loss caused by the power interruption is very large.

The core load accounts for a large proportion: The core load of the conventional data center accounts for more than 80% of the total load.

High power density: The power density of IT equipment is getting higher and higher, and the power load of a single cabinet is getting higher and higher.

Harmonics: A large number of non-linear loads create a source of harmonics.


2. Characteristics of backup power requirements.

Startup success rate: It is usually in a standby state and has few startups. The startup success rate is required to be greater than 99%.

Security: Ensure that the business system can run continuously and stably.

Input time: The starting time of the backup power supply with load is less than the battery backup time and the continuous running time of the cabinet with the maximum power density after the cooling equipment is shut down.


diesel generator set

II. Factors to be considered in the selection of diesel generator sets.


1. Selection of high and low voltage backup power system.

From the electrical system capacity, economy and other factors to compare. High-voltage diesel generator sets are usually used in the following three situations:

(1) When large data centers have high-voltage or medium-voltage equipment.

(2) The number of parallel low-voltage diesel generator sets is too large, and the bus current is too large to meet the current carrying capacity requirements on the bus.

(3) The power supply line provided by the power supply department has a long distance.


2. Performance level.

The data center has strict requirements on the frequency, voltage and waveform characteristics of the output of the diesel generator set.


3. Power selection.

The output power of the diesel generator set should meet the needs of the maximum average load of the data center. The output power of the generator set in the A-level data center should be selected according to the continuous operation power. The output power can choose the limited time running power LTP.


4. Generator set power correction.

Consider the influence of environmental conditions on the output power of diesel generator sets, such as altitude, atmospheric pressure, temperature and other factors.


5. Redundancy requirements.

Determine the redundancy requirements of diesel generator sets according to the data center level and use requirements, such as N+1, N+X, 2N to determine the number of diesel generator sets. The future power growth needs of the data center should also be considered, and a certain surplus capacity should be set aside.


6. Unit automation requirements.

The unit is automatically started and loaded, automatically unloaded and stopped, and the unit is connected in parallel (automatic addition and reduction).


7. Auxiliary configuration of generator set.

In the process of diesel generator set selection, auxiliary facilities should be configured for the generator set according to the specific working environment of the data center, such as unit coolant heating, oil heating, intake air heating, fuel heating, generator dehumidification heating, battery heating and other heating, device, battery charger, etc.


8. Fuel storage.

An on-site oil storage device should be set up. A-level data centers should meet the requirement of 12 hours of oil consumption. When the external oil supply time is guaranteed, the fuel storage capacity only needs to be greater than the external oil supply time.


Jiangsu Starlight Electricity Equipments Co.,Ltd. is one of the earliest manufacturers of generators and diesel generator sets in China. It has been established for more than 40 years and has 64 sales in the country. The service department provides users with one-stop service of design, supply, debugging and maintenance at any time. Welcome contact us by email sales@dieselgeneratortech.com

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