Active Phase Balancing in Data Center Power Zones
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Solution Overview
Problem
Data centers face phase imbalances in three-phase power systems due to server downtime, AC to DC converter drifts, and utility provider voltage sag, leading to nuisance breaker trips, power capping, and over/under voltage/current conditions, which existing technologies fail to adequately address.
Innovation Solution
Implementing a system where a power zone coordinator monitors and adjusts phase power levels across multiple racks, using adjustable phase power supplies to balance the load by generating control signals that adjust the power output of each phase, thereby reducing deviations from target phase power levels and optimizing power utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If load is distributed evenly across phases, then system simplicity is improved, but phase balance deteriorates due to server downtime, converter drift, and voltage sag
Solution Approach 1:
The system continuously monitors phase power levels and uses this feedback to dynamically adjust the power output of individual phase power supplies. The power zone coordinator compares monitored phase power levels to target levels and generates control signals to reduce deviations, creating a closed-loop control system that maintains phase balance despite disturbances.
Solution Approach 2:
The system transitions from static load distribution to dynamic phase balancing. The adjustable phase power supplies can change their output characteristics in real-time based on system conditions, allowing the system to adapt to server downtime, converter drift, and voltage sag while maintaining overall phase balance at the power zone level.
2Reliability
If phase balancing is implemented at rack level, then local phase balance is improved, but flexibility deteriorates due to inability to coordinate across multiple racks
Solution Approach 1:
The system shifts the phase balancing perspective from individual rack level to power zone level. By monitoring and controlling phase power levels across multiple racks collectively, the system achieves phase balance at a higher organizational dimension, allowing racks with non-adjustable loads to be compensated by adjustments in other racks within the same power zone.
Solution Approach 2:
The power zone coordinator serves multiple functions: it monitors phase power levels across all racks, determines deviations from target levels, calculates coordinated adjustments for multiple adjustable phase power supplies, and generates control signals. This multi-functional approach enables flexible coordination across heterogeneous racks with different load compositions.
3Reliability
If adjustable phase power supplies are used, then phase balance control is improved, but device complexity increases due to additional control signals and monitoring
Solution Approach 1:
The adjustable phase power supplies are designed to autonomously respond to control signals from the power zone coordinator. Each phase power supply monitors its own output and automatically adjusts its power level based on received control signals, reducing the need for complex centralized control logic and simplifying the overall control architecture.
4Reliability
If more adjustable phase power supplies are deployed, then phase balancing capability is improved, but cost increases due to additional components
Solution Approach 1:
The system achieves effective phase balancing by adjusting only a proper subset of phase power supplies rather than requiring all phase power supplies to be adjustable. The power zone coordinator identifies which phase power supplies need adjustment and applies control signals only to those, reducing the total number of adjustable components needed while maintaining phase balance capability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach dynamically balances phase power across data center racks, effectively utilizing facility-provisioned power, counteracting imbalances induced by non-adjustable loads, and ensuring more efficient use of the power infrastructure.
Implementation Method 1
each phase, includes an adjustable phase power supply that converts a respective alternating current input to a direct current output
Data Source
AI summary
Methods, systems, and apparatus for managing power in a data center. In one aspect, a method includes monitoring respective phase power level in each phase of an alternating current multi-phase supply that provides power to a plurality of data center alternating current devices in a data center, comparing the respective phase power levels to phase distribution criteria that describe a target phase power level for each respective phase and determine, based on the comparison, a deviation of one or more of monitored phase power levels from the respective one or more target phase power levels and in response generate, for each of two or more data center alternating current devices, respective control signals to adjust the one or more adjustable phase power supplies in the data center alternating current device according to a determined adjustment for the data center alternating current device.