Battery Energy Storage System with Segmented Power Converters
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Solution Overview
Problem
Battery energy storage systems often fail to utilize all batteries when one battery malfunctions, leading to system shutdowns.
Innovation Solution
A battery energy storage system with multiple battery packs and power converter systems, controlled by a controller that allows for linking or independent operation of the packs, ensuring continuous charging and discharging even if one battery or power converter system fails, using a transformer to manage power flow and a monitor device to display operational states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the battery energy storage system uses a centralized control structure where all batteries are connected to a single power converter system, then the system structure is simple, but the whole system must be stopped when one battery abnormally operates
Solution Approach 1:
The system divides the battery energy storage system into multiple independent battery packs, each with its own power converter system. This segmentation allows individual battery packs to operate independently, so that when one battery pack abnormally operates, only that specific pack needs to be stopped while other packs continue to function normally, thereby maintaining system reliability without significantly increasing overall structural complexity.
2Reliability
If the battery energy storage system allows independent operation of each battery pack with separate power converter systems, then the system reliability is improved, but the device complexity increases
Solution Approach 1:
The system merges multiple battery packs and their corresponding power converter systems into a unified battery energy storage system with a common control unit. This merging approach allows the system to maintain the reliability benefits of independent battery pack operation while managing the complexity through integrated control and shared infrastructure, balancing both reliability and device complexity.
3Object-affected harmful factors
If the system stops charging/discharging when one battery pack abnormally operates, then the safety is ensured, but the productivity is reduced due to loss of usable battery capacity
Solution Approach 1:
The system extracts or isolates the abnormally operating battery pack from the overall system through individual disconnection capability. This allows the problematic battery pack to be removed from the charging/discharging circuit while other normal battery packs continue to operate, ensuring safety by preventing the abnormal pack from affecting the system while maintaining productivity by preserving the capacity of healthy battery packs.
4Adaptability or versatility
If the system uses multiple power converter systems for multiple battery packs, then the adaptability is improved, but the loss of energy increases due to multiple conversion processes
Solution Approach 1:
The system dynamically configures the operational state of each battery pack and its associated power converter system based on real-time conditions. When a battery pack is normal, its power converter system operates to enable flexible charging/discharging; when abnormal, the system dynamically disconnects that pack to reduce energy losses from inefficient conversion processes, thereby adapting the system operation to minimize energy loss while maintaining necessary adaptability.
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
Ensures continuous operation and prevents accidents by allowing remaining battery packs and power converter systems to take over when one fails, maintaining charging and discharging efficiency and extending system lifespan.
Implementation Method 1
a transformer disposed between the external power source device and the plurality of power converter systems
Data Source
AI summary
The present invention relates to a battery energy storage system including: a plurality of battery boxes provided with a plurality of battery packs; a plurality of power converter systems respectively connected to the plurality of battery boxes to selectively charge or discharge the plurality of battery boxes through alternating current supplied from an external power source device; a transformer disposed between the external power source device and the plurality of power converter systems; and a controller controlling the plurality of power converter systems to selectively charge or discharge the plurality of battery boxes.