Parallel UPS Bypass Feed Path Control
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Solution Overview
Problem
In parallel uninterruptible power supply (UPS) systems, load sharing during bypass operation is heavily dependent on external cable lengths, leading to inefficiencies and potential failures of static switch modules (SSMs) that go unnoticed due to lack of active control, resulting in reduced efficiency and reliability.
Innovation Solution
A controller-based adaptive capacity control system that dynamically switches on and off bypass feed paths based on load and capacity ratings, and includes failure detection mechanisms to identify SSM failures, using inductors to expose failures and measure current values to determine open or short-circuit conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bypass feed paths are actively controlled based on load and capacity ratings, then system efficiency and reliability improve, but device complexity increases
Solution Approach 1:
The controller continuously monitors load conditions and capacity ratings of UPS modules, using this feedback to dynamically determine which bypass feed paths should be activated. This closed-loop control ensures optimal system configuration under varying load conditions, improving reliability while maintaining manageable complexity through automated decision-making algorithms.
Solution Approach 2:
The system transitions from static bypass path configuration to dynamic control where the controller adaptively switches bypass feed paths on or off based on real-time load and capacity conditions. This dynamic adaptation allows the system to optimize performance and reliability for different operating scenarios without requiring manual reconfiguration.
2Reliability
If SSM failures are undetected due to lack of active control, then device complexity remains low, but system reliability deteriorates
Solution Approach 1:
The controller implements continuous monitoring of bypass feed path currents and compares actual measurements against expected values based on active bypass paths. When discrepancies are detected, the system identifies potential SSM failures, providing feedback that enhances reliability without requiring complex external monitoring equipment.
Solution Approach 2:
The system uses its own operational data (current measurements from active bypass paths) to self-diagnose potential SSM failures. By analyzing current flow patterns and comparing them against the known configuration of active bypass paths, the system performs self-monitoring and failure detection without additional dedicated sensing equipment.
3Loss of energy
If multiple UPS modules operate in parallel without active load sharing control, then device complexity is reduced, but energy loss increases due to inefficient load distribution
Solution Approach 1:
The controller monitors the operational status and load conditions of each UPS module in the parallel configuration, using this feedback to intelligently determine which modules should be active and which bypass feed paths should be utilized. This optimizes load distribution across available capacity, reducing energy losses from inefficient operation while maintaining manageable system complexity through centralized control logic.
Data Source
AI summary
Systems, methods, and devices for controlling parallel uninterruptible power supplies (UPSs) are provided. One example of a parallel UPS system may include several UPS modules to supply power to a load and at least one controller. At least some of the UPS modules may include a bypass feed path that can be switched on or off via a static switch module (SSM). The controller may adaptively control which of the bypass feed paths are switched on and off based on the load and respective capacity ratings of the UPS modules. The controller may also determine when an SSM of one of the bypass feed paths is likely to have failed.