Energy Storage Valve Submodule With Redundant DC Bus Power Paths
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Solution Overview
Problem
Existing energy storage valve submodules suffer from poor reliability due to complex wiring, singular power extraction sources, and a high likelihood of over-discharge, which can lead to safety issues such as thermal runaway and reduced charge-discharge performance.
Innovation Solution
The energy storage valve submodule is designed with multiple power extraction sources by connecting an energy storage module to a load via a main direct current bus and further connecting the load to another energy storage valve submodule, incorporating power conversion modules and buses to simplify wiring and enhance reliability, and includes power modules for charge-discharge switching and overcurrent protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-voltage busbars are used for power extraction in existing energy storage valve submodules, then power extraction capability is improved, but wiring complexity increases and reliability deteriorates
Solution Approach 1:
The patent introduces a DC bus as an intermediary component between the energy storage module and the load. The DC bus serves as a mediator that simplifies the wiring structure by providing a standardized connection interface, replacing the complex high-voltage busbar configuration. This intermediary element maintains power extraction capability while significantly reducing wiring complexity and improving reliability.
2Adaptability or versatility
If multiple internal power extraction points are provided in existing energy storage valve submodules, then power extraction flexibility is improved, but the likelihood of short-circuit faults increases
Solution Approach 1:
The patent extracts the power extraction function from multiple internal points and consolidates it to a single standardized DC bus interface. By taking out the distributed power extraction points and replacing them with a centralized DC bus connection, the system maintains power extraction flexibility through the bus's connection capabilities while eliminating the short-circuit risks associated with multiple internal extraction points.
3Device complexity
If singular power extraction source is used in existing energy storage valve submodules, then system structure is simplified, but reliability deteriorates and over-discharge risk increases
Solution Approach 1:
The DC bus is designed with multi-functionality to serve dual purposes: it acts as both a power extraction interface and a power supply source. This universal component can extract power during normal operation and also provide power supply capabilities when needed, thereby improving reliability without significantly increasing system structural complexity.
Data Source
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AI summary
An energy storage valve submodule, an energy storage valve, and an energy storage station are provided, pertaining to the field of power electronics technologies. The energy storage valve submodule includes an energy storage module and a load; where the load is electrically connected to the energy storage module; and the load is further electrically connected to another energy storage valve submodule. This provides a plurality of power extraction methods, enhances reliability, and reduces the risk of over-discharge of the energy storage module.