UPS Phase Selection Control for Power Loss Reduction
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Solution Overview
Problem
Uninterruptible power supplies (UPSs) face inefficiencies in power distribution, particularly when operating under varying load conditions, as they often use all three phases of input power regardless of load levels, leading to unnecessary power loss.
Innovation Solution
A UPS system that dynamically adjusts the number of phases used for power input based on load levels, transitioning from one to three phases as needed, utilizing a controller to monitor parameters like voltage and current to optimize phase selection and minimize power loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If all three phases of input power are used continuously, then the UPS can handle high load conditions, but power loss increases during low load operation
Solution Approach 1:
The UPS system dynamically adjusts the number of active input phases based on real-time load conditions. The controller monitors load parameters and switches between one-phase, two-phase, and three-phase operation modes, making the system adaptable rather than static. This dynamic adjustment resolves the contradiction by reducing power loss during low load while maintaining full three-phase capability when needed.
Solution Approach 2:
The system changes the operational parameter of phase configuration from a fixed three-phase mode to a variable mode (one-phase, two-phase, or three-phase). By changing this parameter based on load conditions, the system optimizes power utilization and reduces energy loss during light load operation while preserving the ability to handle high load conditions.
2Loss of energy
If the UPS operates in one-phase mode during low load, then energy efficiency improves, but the system must rapidly transition to three-phase mode when load increases
Solution Approach 1:
The controller continuously monitors load parameters and anticipates load changes, preparing for phase transitions in advance. By detecting when load approaches threshold values, the system can smoothly transition between phase configurations before power instability occurs, maintaining reliability while operating in efficient low-phase modes during light load conditions.
Solution Approach 2:
The system employs feedback control where the controller continuously monitors load conditions and adjusts the number of active phases accordingly. This closed-loop control ensures that the UPS transitions between one-phase, two-phase, and three-phase modes based on real-time feedback, resolving the contradiction by maintaining stability through continuous adaptation rather than causing disruptions through abrupt changes.
3Productivity
If the UPS uses three phases during low load, then power availability is maximized, but system efficiency decreases due to unnecessary power consumption
Solution Approach 1:
The system extracts only the necessary number of phases required to handle the current load. Instead of continuously using all three phases, the controller determines the minimum required phases (one, two, or three) based on load conditions, removing unnecessary phase connections during low load operation. This resolves the contradiction by maintaining adequate power availability while eliminating wasteful energy consumption from unused phases.
Solution Approach 2:
The system applies partial action by using only one or two phases instead of all three when the load does not require full three-phase power. This partial utilization of available phases optimizes energy consumption while still providing sufficient power availability for the current load level, resolving the contradiction between maximizing power availability and minimizing energy consumption.
Data Source
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AI summary
Systems and methods of controlling an uninterruptible power supply are provided. The uninterruptible power supply includes an input configured to receive input power having three phases, an output configured to provide output power, a power conversion circuit coupled with the input and the output, one or more sensors configured to monitor one or more parameters related to the output power, and a controller coupled with the power conversion circuit and the one or more sensors. The controller is configured to receive, from the one or more sensors, values for the one or more parameters, and based on the values for the one or more parameters, select a number of phases of the input power for receiving power for the power conversion circuit.