Parallel Power Unit Control for Battery Deviation Balancing
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Solution Overview
Problem
The existing power supply systems face challenges in maintaining appropriate charging and discharging control when power deviations occur among multiple power supply units, leading to potential system failures due to variations in battery conditions and internal resistances.
Innovation Solution
A power supply system configuration with parallel-connected power supply units, each equipped with a unit controller and a switch, and a control system that includes a power conditioner and a master controller. The master controller collects battery information from each unit controller to determine the possible total power and working individual power, ensuring that charging and discharging operations are within safe limits, even in the presence of power deviations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple power supply units are connected in parallel to increase power supply capacity, then the total power output is improved, but power deviations among units cause control difficulties and system reliability deteriorates
Solution Approach 1:
The system divides the power supply into multiple independent power supply units, each with its own unit controller that monitors battery information and communicates with the master controller. This segmentation allows individual unit management while maintaining overall system functionality, resolving the contradiction by enabling parallel connection for increased power while preserving reliability through distributed control.
Solution Approach 2:
The master controller collects battery information from each unit controller and uses this feedback to calculate possible total power and working individual power. The system continuously monitors power deviations and adjusts control commands accordingly, ensuring that each unit operates within safe limits while maintaining optimal total power output, thus resolving the reliability issue.
2Ease of operation
If power control is performed based on total power without considering individual unit deviations, then control simplicity is improved, but power deviations cause inappropriate control and system stability deteriorates
Solution Approach 1:
The system implements local quality control by having each unit controller monitor its own battery information and communicate specific unit conditions to the master controller. The master controller then calculates individual working power limits based on each unit's characteristics and current state, ensuring that control is adapted to local conditions while maintaining overall system coordination.
Solution Approach 2:
The system dynamically adjusts the working individual power for each unit based on real-time battery information and detected power deviations. The master controller continuously recalculates power distribution to account for changing unit conditions, maintaining system stability while preserving control simplicity through automated dynamic adjustment.
3Measurement precision
If the power conditioner communicates with each power supply unit individually, then control precision is improved, but system complexity increases
Solution Approach 1:
The master controller serves as an intermediary between the power conditioner and multiple unit controllers. It collects battery information from each unit, calculates possible total power and working individual power, and distributes control commands accordingly. This intermediary role maintains control precision by enabling individual unit monitoring while reducing system complexity by centralizing the coordination logic.
Data Source
AI summary
The power conditioner determines possible total power and working individual power to be in a range that possible individual power of each of the power supply units is not exceeded. The possible total power is determined from the possible individual power, of each of the power supply units, determined based on the battery information detected by each of the unit controllers, collected by a master controller from each of the unit controllers. The working individual power is determined based on a power deviation indicating a difference of charging and discharging power between the power supply units. The power conditioner causes charging and discharging of each of the power supply units within the calculated working individual power.