Current Sharing Scaling Factor for Controlled Load Transition
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Solution Overview
Problem
In large data centers, the abrupt load transition from Battery Backup Units (BBUs) to Power Supply Units (PSUs) during power outages can overload backup generators, leading to shutdowns, despite conventional randomized transition methods and internal PSU control techniques.
Innovation Solution
A system where a BBU and PSU are coupled via a current sharing bus, with a controller that adjusts the current sharing scaling factor to manage load transition, allowing the BBU to supply all current when the PSU is off, reducing the scaling factor during backup, and increasing it when the PSU is turned back on, to achieve a controlled and gradual load transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If simultaneous load transfer from BBUs to PSUs is implemented across all IHSs, then continuous powering of IHS is maintained, but backup generator is overloaded leading to shutdown
Solution Approach 1:
The patent divides the data center into multiple zones or groups, and implements load transfer in a staged manner across these segments rather than simultaneously across all IHSs. This segmentation allows the backup generator to handle the load incrementally, preventing overload while maintaining continuous powering.
Solution Approach 2:
The system performs preliminary assessment of generator capacity and pre-plans the load transfer sequence before power interruption occurs. The controller prioritizes which IHSs or zones will transfer load first based on generator response capability, ensuring the transfer rate does not exceed generator inertia limits.
2Object-affected harmful factors
If conventional walk-in transition with 200 W per second ramp is implemented, then generator overload is reduced, but transition time extends to around 10 seconds
Solution Approach 1:
The system performs preliminary charging of BBUs before power interruption, ensuring they are fully charged and ready for immediate takeover. This pre-charging eliminates the need for extended transition times during actual power events, as the BBUs can instantly assume full load without gradual ramping.
Solution Approach 2:
The patent dynamically changes operational parameters such as BBU charging voltage, current, and state-of-charge thresholds based on predicted power event scenarios. By adjusting these parameters in advance, the system optimizes the balance between transition speed and generator protection, achieving faster transitions without overload.
Data Source
AI summary
Systems and methods for achieving controlled load transition between power supplies and battery units are described. A method may include determining that a Power Supply Unit (PSU) coupled to an IHS via a power transmission interface is turned off; allowing a Backup Battery Unit (BBU) coupled to the IHS via the power transmission interface and in parallel with the PSU via a current sharing bus to supply all current consumed by the IHS via the power transmission interface while the PSU is turned off, where the PSU and the BBU are each configured to output a current sharing signal onto the current sharing bus that is indicative of the PSU's or BBU's current being supplied to the IHS via the power transmission interface; reducing a current sharing scaling factor of the BBU; determining that the PSU is turned back on; and increasing the current sharing scaling factor of the BBU.