Parallel UPS Current Distribution by Battery Capacity
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Solution Overview
Problem
In parallel UPS systems, the system backup time is limited by the battery string with the smallest available capacity, leading to resource waste and reduced extension of backup time due to current equalization methods, which do not fully utilize battery strings with larger capacities.
Innovation Solution
A current distribution method where each UPS apparatus adjusts its output current based on the available battery capacity of its connected battery string, with a proportionally larger capacity string outputting more current and a smaller capacity string outputting less, ensuring the total output current is maintained while extending backup time and optimizing resource utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current equalization method is used in parallel UPS system, then each UPS apparatus outputs equal current, but system backup time is limited by the battery string with smallest capacity and resource utilization is reduced
Solution Approach 1:
The patent applies local quality by allowing each UPS apparatus to have different current output characteristics based on its connected battery string's capacity. Specifically, the control module adjusts the current output of each UPS apparatus proportionally to the available battery capacity of its connected battery string, so that UPS apparatuses with larger capacity battery strings output more current while those with smaller capacity output less current. This resolves the contradiction by moving from uniform current distribution to differentiated current distribution matched to local battery characteristics.
2Adaptability or versatility
If battery strings with different available capacities are connected to UPS apparatuses, then system can be configured with existing battery strings, but current equalization causes waste to battery strings with large capacity and limits extension of backup time
Solution Approach 1:
The patent applies dynamics by making the current output of each UPS apparatus dynamically adjustable based on the real-time available battery capacity of its connected battery string. The control module continuously monitors the battery capacity and adjusts the current distribution ratio accordingly, allowing the system to adapt to changing battery states. This dynamic adjustment enables the system to fully utilize battery strings with different capacities while maintaining optimal performance, resolving the contradiction between configuration flexibility and resource utilization.
3Ease of operation
If current equalization is used, then control is simplified, but battery strings with large capacity cannot contribute fully to extending backup time
Solution Approach 1:
The patent applies feedback by implementing a control mechanism that monitors the available battery capacity of each battery string and uses this information to adjust the current output of corresponding UPS apparatuses. The control module receives feedback on battery capacity status and dynamically adjusts current distribution ratios to maximize backup time. This feedback-based control resolves the contradiction by automating the complex current distribution calculations, maintaining ease of operation while enabling full utilization of battery capacity for extended backup time.
Data Source
AI summary
This application discloses a non-current equalization UPS apparatus, a current distribution method, and a parallel UPS system. The current distribution method may be applied to any UPS apparatus in a parallel UPS system. A current proportion of a first current output by the any UPS apparatus in a total output current of the parallel UPS system is positively related to a capacity proportion of an available battery capacity of a battery string correspondingly connected to the any UPS apparatus in a total available battery capacity of the parallel UPS system. Therefore, a system backup time of the parallel UPS system can be prolonged, and resource utilization of a battery string with a large available battery capacity can be improved.