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Selection Of Diesel Generator Sets For Backup Power In Data Center

Nov. 16, 2021

Power supply is the basic guarantee for the normal operation of IT equipment in the data center. Once a power supply failure occurs in the data center, it will cause business system downtime and data loss. Therefore, the backup power supply is one of the indispensable important equipment in the data center.


Diesel generator sets are one of the backup power sources widely used in data centers. When there is an emergency in normal power supply, the UPS or high-voltage DC backup battery of the data center enters the discharge mode to ensure the continuity of power supply for IT equipment. At the same time, the data center backup power-diesel generator set will quickly start 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. combines the characteristics of data center load power requirements and briefly summarizes the factors that need to be considered in the selection of diesel generators and summarizes them as follows.


I. Data center load and power demand characteristics.


1. Data center load characteristics.


High load level: Business continuity requirements are very high, and the loss caused by power supply 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 electricity load of a single cabinet is getting higher and higher.


Harmonic: A large number of nonlinear loads generate harmonic sources.


2. Features of standby power requirements.


Start-up success rate: It is usually in standby state, the number of starts is small, and the startup success rate is required to be greater than 99%.


Security: to ensure continuous and stable operation of the business system.


Put-in time: The standby power start-up and load time is less than the battery standby time and the continuous operation time of the cabinet with the maximum power density after the refrigeration equipment is shut down.


diesel generator set

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


1. High and low voltage backup power system selection.


The comparison is made from factors such as electrical system capacity and economy. Generally, high-voltage diesel generator sets are used in the following three situations:

(1) When a large data center has high-voltage or medium-voltage equipment.

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

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


2. Performance level.

Data centers have strict requirements on the frequency, voltage and waveform characteristics of diesel generator sets. The performance level of diesel generator sets using backup power should not be lower than G3.


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 A-level data center generator set should be selected according to the continuous operating power of COP. The B-level data center load nature, mains reliability and investment economy, generator set The output power can choose the limited time operating power LTP.


4. Power correction of generator set.

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 usage requirements, such as N+1, N+X, 2N to determine the number of diesel generator sets. It is also necessary to consider the future power growth requirements of the data center and set aside a certain amount of surplus capacity.


6. Unit automation requirements.

The unit starts and loads automatically, unloads and stops automatically, and the units are connected in parallel (automatically add and subtract).


7. Auxiliary configuration of generator set.

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


8. Fuel storage capacity.

An on-site oil storage device should be installed. A-level data center should meet 12h 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. The company was established in 1974 and the company occupies an area. With an area of 86,000 square meters and a building area of 45,000 square meters, it has 64 sales and service departments across the country to provide users with one-stop service of design, supply, debugging and maintenance at any time. Welcome customers to come to consult and visit. Looking forward to your inquiry, please send email to us for details sales@dieselgeneratortech.com

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