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An AI Server Data Center has its IT racks supported with energy from upstream sources including utility and energy storage through various power stages which have the facility's operation safeguarded in case of any unexpected power outage or transient events. However, in the ultimately worst situation where both backup energy and grid are output of supply, it is the diesel generator that functions as the sole source which the server racks should finally resort to for consistent operation.
The preceding circumstances to diesel generation's being triggered for operation are dependent on the facility's architecture. For example, an ESS-integrated HVDC data center will have firstly the energy storage to back up the facility before the generator is set for running. While for directly-grid-tied facility through UPS from its MVAC-bus the diesel generator follows when both backup battery and grid fail to support the operation.
Below diagrams and notes explain what happens in an AI data center forming DC-bus Micro-grid before the diesel generation is triggered for operation.
In normal operation, the data center facility relies on utility power for continuous operation, with the BESS taking advantage of favorable conditions to store energy. (The downstream 800VDC energy storage serves as a supporting source to improve electrical characteristics at the load side, rather than providing overall facility-level resilience.)
In the event of a grid outage, the facility shifts to relying on the BESS as the primary voltage source, temporarily forming an AC micro-grid at the MV level (which then feeds the downstream DC distribution). Crucially, the BESS must possess grid-forming capability to establish and maintain voltage and frequency in the absence of the utility grid. In this scenario, the BESS functions as a transient power bridge before the diesel generators are successfully online.
Before the BESS - acting as the temporary voltage source - runs out of energy, the previously activated diesel generators reach rated speed and take over the role of feeding the MV Network. Once the generators are stabilizing the load, the BESS is shifted to standby mode to prepare for any potential future anomalies.
Evaluate massive generator arrays capable of delivering tens of megawatts to support AIDC facilities.
Single diesel generator units are typically rated between 2MW and 4MW. In real-world AIDC deployments, these units are paralleled to form massive generator arrays capable of delivering tens of megawatts to support the facility.
Validate operational efficiency and prevent "wet stacking" at a load profile below 30%.
While not exclusive to AI workloads, testing at a load profile below 30% is critical. It validates the generator's operational efficiency, emissions compliance, and its ability to prevent "wet stacking" (unburned fuel buildup) during periods of low IT utilization or commissioning phases.
Mimic the sudden power spikes inherent to heavy GPU/AI compute workloads.
Designed to mimic the sudden power spikes inherent to heavy GPU/AI compute workloads, this tests the generator's dynamic resilience. It evaluates voltage and frequency stability during aggressive load steps, such as sudden shifts from 0% to 50%, and subsequently stepped up to 100% block load.
Cabinet source-load system with both the advantages of module-based scalability and high-power application capability. 4-quadrant and regenerative sinking supported.
Regenerative AC load simulator for utility-scale testing application. Versatile electrical environment and condition profile emulation for comprehensive load validation.
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