Battery Cluster Reconnection Control After Fault Clearance
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Solution Overview
Problem
In large-scale energy storage systems, faulty battery clusters often require manual maintenance after disconnection, leading to decreased charging-discharging capacity and poor automatic management capabilities.
Innovation Solution
An operation control method and device for battery clusters that determine whether a fault-free offline battery cluster meets charging conditions and switching-in conditions, allowing automatic reconnection to the energy storage system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery cluster is disconnected from the system due to a fault, then the faulty battery cluster is isolated from the system, but the system charging-discharging capacity decreases and manual maintenance is required
Solution Approach 1:
The control device automatically detects fault clearance and initiates reconnection of the battery cluster without manual intervention. The system monitors voltage differences and automatically controls the direct-current contactor to reconnect the battery cluster when conditions are met, eliminating the need for manual maintenance operations.
Solution Approach 2:
The control device continuously monitors the voltage difference between the battery cluster and the direct-current bus. When the voltage difference exceeds the threshold indicating fault clearance, the system automatically triggers the reconnection process, using feedback from voltage measurements to control system state transitions.
2Duration of action of stationary object
If the voltage difference threshold is set low to protect the direct-current contactor, then the contactor service life is extended, but the battery cluster cannot be reconnected after fault clearance due to excessive voltage difference
Solution Approach 1:
Before attempting to reconnect the battery cluster, the control device first checks whether the voltage difference between the battery cluster and the direct-current bus is within the safe threshold range. This preliminary voltage check ensures that reconnection only occurs when it will not damage the direct-current contactor, protecting the component while enabling reconnection when conditions are favorable.
3Extent of automation
If software configuration is used to control battery cluster switching, then automation capability is improved, but the system cannot adapt to dynamic voltage changes after fault clearance
Solution Approach 1:
The control device dynamically adjusts the voltage difference threshold based on the operational state of the energy storage system. When the system is in a state suitable for reconnection, the threshold is set to allow connection; when the system state is not suitable, the threshold prevents connection. This dynamic adjustment enables the automated system to adapt to changing voltage conditions while maintaining protection of the direct-current contactor.
Data Source
AI summary
An operation control method and device for a battery cluster and a related apparatus are provided. The method includes: determining whether a battery cluster which is fault-free and offline in an energy storage system meets a charging condition; determining whether a bus voltage of the energy storage system is greater than or equal to a voltage of the battery cluster if the battery cluster meets the charging condition; determining whether the battery cluster meets a switching-in condition if the bus voltage of the energy storage system is greater than or equal to the voltage of the battery cluster; and connecting the battery cluster to the energy storage system if the battery cluster meets the switching-in condition.