Battery Cluster Leakage Fault Isolation in Energy Storage
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Solution Overview
Problem
Leakage current faults in energy storage systems cause safety accidents and require manual system disconnection for maintenance, making it difficult to identify and address the fault location.
Innovation Solution
An energy storage system with a detection circuit and controller that disconnects power conversion circuits upon detecting excessive leakage current, reconnects specific components, and sends alarm information to pinpoint the fault location, facilitating efficient maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual checking is performed after system disconnection, then safety is ensured, but maintenance difficulty increases and time is lost
Solution Approach 1:
The system performs self-diagnosis by automatically detecting leakage current faults and identifying their locations through the controller and detection circuits, eliminating the need for manual checking and enabling automated fault localization
Solution Approach 2:
The system pre-identifies fault locations before maintenance personnel arrive by continuously monitoring leakage current and using the controller to determine which specific component (battery cluster, cable, or functional module) has the fault, so that maintenance can begin immediately at the correct location
2Reliability
If system disconnection is performed for fault checking, then safety is improved, but productivity decreases due to extended downtime
Solution Approach 1:
The system performs preliminary fault location identification by continuously monitoring leakage current and using the controller to determine the specific fault component before maintenance begins, eliminating the need for extended system disconnection and manual checking, thus reducing downtime and improving maintenance efficiency
Solution Approach 2:
The patent replaces manual mechanical checking with automated electronic detection circuits and controller-based fault location algorithms, enabling rapid identification of leakage current faults without requiring system disconnection or manual intervention, thereby improving productivity
3Measurement precision
If comprehensive detection is implemented, then fault location precision is improved, but device complexity increases
Solution Approach 1:
The system segments the energy storage system into distinct components (battery cluster, cable, functional module circuits) and uses detection circuits to independently monitor each segment, enabling precise fault location through systematic isolation and identification without requiring complex overall system modification
Data Source
AI summary
In an energy storage system, a battery cluster is connected to a battery cluster control circuit, the battery cluster control circuit is connected to one end of a first power conversion circuit, the first power conversion circuit is configured to connect to a power grid or a load, and a first detection circuit is disposed between the first power conversion circuit and the power grid or the load. When the first detection circuit detects that a leakage current of the energy storage system is greater than a preset safety threshold, a controller controls the battery cluster control circuit and the first power conversion circuit to be disconnected. After controlling the battery cluster control circuit and the first power conversion circuit to be disconnected, the controller controls the battery cluster control circuit to be connected, and sends alarm information indicating that a leakage current fault occurs in the battery cluster.