Multi-mode UPS Reactive Power Compensation via Segmented Modules
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Solution Overview
Problem
In energy saver mode, multi-mode UPS systems face challenges with uncontrolled power factor due to reactive power drawn by loads and capacitors, leading to inefficiencies and potential power quality issues.
Innovation Solution
The implementation of a static bypass switch and controllable power modules for reactive power compensation, controlled by a data-driven algorithm to adjust reactive power flow and determine the number of active power modules required for optimal compensation, ensuring an ideal power factor of 1.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the UPS system operates in energy saver mode with rectifier and inverter commanded off, then power consumption is reduced and operation efficiency is improved, but power factor control is lost and reactive power compensation capability deteriorates
Solution Approach 1:
The power modules are divided into multiple independent units, each capable of being individually controlled for reactive power compensation. This segmentation allows the system to activate only the necessary number of modules for power factor correction while keeping others in standby, thus maintaining energy savings while providing reactive power support.
Solution Approach 2:
The system dynamically adjusts the number of active power modules based on the actual reactive power compensation needs. The controller continuously monitors the power factor and activates additional modules only when the power factor deviates from the target range, optimizing the balance between energy consumption and power quality.
2Object-generated harmful factors
If multiple power modules are kept active for reactive power compensation, then power factor is improved, but system complexity and control requirements increase
Solution Approach 1:
Instead of activating all power modules or using complex control algorithms, the system uses a simplified approach where modules are activated in a predetermined sequence based on simple power factor threshold checks. This partial action approach provides sufficient reactive power compensation without requiring complex coordination between multiple modules.
Solution Approach 2:
Each power module is equipped with independent control capability, allowing it to autonomously provide reactive power compensation when activated. The modules essentially serve themselves by independently managing their own operation based on simple control signals from the main controller, reducing the overall control complexity.
Data Source
AI summary
An uninterruptible power supply (UPS) system operable in an energy saver mode includes: a static bypass switch connected between an input connector and an output connector of the UPS system and being activatable to operate the UPS system in the energy saver mode; a plurality power modules, each of the plurality of power modules being connected between the input connector and the output connector of the UPS system and at least some of the plurality of power modules being controllable for a reactive power compensation; and a controller for controlling one or more of the controllable power modules depending on a data input related to a reactive power compensation. The controller controls one or more of the controllable power modules depending on the data input such that a reactive power flow via the UPS system is adjusted.