Three-Phase PSU Control for Current Unbalance in Server Power
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Solution Overview
Problem
The imbalance of currents in three-phase AC power supplies within facilities such as data centers, factories, or buildings leads to increased power consumption and risks of electrical tripping, necessitating effective current balance control.
Innovation Solution
An electric energy management system and method that includes a sensing unit to monitor phase current values and a management unit to adjust the operating quantities of power supply units to balance currents by deactivating or enabling power supply units when unbalance exceeds a threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the loads of multiple facilities change, then the operational flexibility of the field is improved, but the current balance between three-phase AC power supply deteriorates
Solution Approach 1:
The management unit continuously monitors current values of all power supply units and uses this feedback to dynamically adjust which units remain operational. When current imbalance is detected, the system automatically deactivates specific power supply units to restore balance, creating a closed-loop control system that maintains reliability while allowing load flexibility.
Solution Approach 2:
The system dynamically adjusts the operational status of power supply units based on real-time current conditions. Instead of a static configuration, the management unit can enable or disable specific units (e.g., switching from all units active to selective units active) to adapt to changing load conditions and maintain current balance.
2Power
If the current value of a single phase is increased to accommodate load changes, then the power supply capacity is improved, but the power consumption increases significantly
Solution Approach 1:
The power supply system is segmented into multiple independent power supply units, each connected to different phases. By selectively activating or deactivating specific units based on current balance requirements, the system can maintain adequate power supply capacity while avoiding the energy waste associated with running all units at high current levels.
3Power
If the current value of a single phase is increased, then the power supply capacity is improved, but the risk of electrical tripping increases
Solution Approach 1:
The management unit continuously monitors current values and uses this feedback to prevent any single phase from exceeding safe current thresholds. When imbalance is detected, the system automatically adjusts the operational configuration to distribute load more evenly, thereby maintaining power capacity while eliminating tripping risks.
Data Source
AI summary
An electric energy management device, an electric energy management system, and an electric energy management method for controlling a current balance are provided. The electric energy management device includes a sensing unit and a management unit. The sensing unit senses a first phase current value, a second phase current value, and a third phase current value. The management unit obtains a current unbalance value between the first phase current value, the second phase current value, and the third phase current value, and changes the operating quantities of first PSUs, second PSUs, and third PSUs of the server devices in response to the current unbalance value being higher than a threshold.