UPS Module Synchronization for Stranded Power Recovery
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Solution Overview
Problem
Existing uninterruptible power supply (UPS) systems face constraints in utilizing stranded power due to synchronization and power rating requirements, limiting the ability to seamlessly recover and utilize excess capacity for backup or maintenance purposes without pre-installed power sharing systems and potential disconnection during mode changes.
Innovation Solution
The implementation of AC/AC converters with active rectifier front ends and inverter back ends in each UPS module, which synchronize their outputs with other converters to provide synchronized AC power to a recovered power bus, eliminating the need for a power sharing control system and allowing autonomous operation, enabling seamless integration and utilization of stranded power without requiring synchronized voltage, frequency, and phase across all modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If static switches are used to connect AC power outputs to a common recovered power bus, then stranded power can be recovered and utilized, but synchronization requirements and power rating constraints limit system flexibility and require pre-installed power sharing systems
Solution Approach 1:
Each UPS module autonomously controls its own AC/AC converter without requiring external power sharing control signals. The module independently synchronizes its output to the recovered power bus and manages its own static switch operation, eliminating the need for centralized power sharing control systems while enabling stranded power recovery
Solution Approach 2:
The power sharing control function is distributed to individual UPS modules rather than being centralized. Each module operates as an independent unit with its own control logic, allowing modular expansion and eliminating the need for pre-installed centralized power sharing infrastructure
2Productivity
If UPS modules are connected to the recovered power bus, then stranded power can be utilized, but voltage, frequency, and phase synchronization requirements limit adaptability and may require disconnection during mode changes
Solution Approach 1:
The AC/AC converter dynamically adjusts its output parameters (voltage, frequency, phase) to match the recovered power bus in real-time. This dynamic synchronization allows UPS modules to connect and disconnect from the recovered power bus during mode changes without requiring system-wide re-synchronization or disconnection of other modules
Solution Approach 2:
The system changes the operating parameters of the AC/AC converter based on the connection state. When connected to the recovered power bus, the converter adjusts its output parameters to match the bus parameters, enabling flexible mode changes while maintaining synchronization and continuous power utilization
3Power
If all UPS modules are synchronized to provide AC power to the recovered power bus, then stranded power can be effectively utilized, but the requirement for synchronized voltage, frequency, and phase across all modules increases installation complexity
Solution Approach 1:
Each UPS module autonomously performs synchronization of its AC/AC converter output to the recovered power bus without requiring manual configuration or coordination with other modules. This self-synchronization capability eliminates complex installation procedures while enabling all modules to contribute to stranded power recovery
Solution Approach 2:
The AC/AC converter acts as an intermediary between the UPS module and the recovered power bus, performing all necessary synchronization and parameter matching functions. This intermediary device simplifies the connection process and enables easy installation while maintaining synchronized operation across all connected modules
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 solution allows for the efficient and autonomous recovery and utilization of stranded power within UPS systems, enabling seamless backup and maintenance operations without pre-installed power sharing systems, reducing installation complexity and ensuring continuous power availability by synchronizing AC power outputs within industry tolerances.
Implementation Method 1
an AC/AC converter that transforms a first AC power output from the UPS to a second AC power output
Data Source
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AI summary
An uninterruptible power supply (UPS) system with stranded power recovery has a plurality of UPS modules with one or more of the UPS modules usable to provide stranded power to a recovered power bus. When a UPS module is used to provide stranded power to the recovered power bus, the AC/AC converter associated with that UPS module provides AC power that is synchronized with AC power being provided to the recovered power bus by each of the other AC/AC converters that are providing AC power. In this manner all of the AC/AC converters that are providing AC power to the recovered power bus have the same voltage, the same frequency and are in phase.