High-Frequency Isolation Charging for Short-Circuit-Safe Energy Storage
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Solution Overview
Problem
Existing charging systems face limitations due to single box-type transformer capacity, peak electricity charges, and short-circuit risks in energy storage systems, leading to inefficiencies and safety hazards.
Innovation Solution
An energy storage charging system utilizing high-frequency isolation transformers and conversion apparatuses to isolate and control electric energy flow, enabling safe and efficient charging and discharging of energy storage systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single box-type transformer is used to supply power to the charging system, then the system structure is simple, but the power supply capacity is limited and cannot meet high-power charging demands
Solution Approach 1:
The patent divides the single transformer system into multiple parallel transformers. Each transformer independently supplies power to specific charging piles, thereby increasing the overall power supply capacity while maintaining manageable system complexity through modular architecture
Solution Approach 2:
The patent designs a charging system where multiple transformers can serve multiple charging piles simultaneously, and the system can adaptively allocate power based on demand. The control system manages multiple power sources to provide universal power supply capability across different charging scenarios
2Device complexity
If energy storage apparatus is directly connected to the direct-current bus without isolation, then the system complexity is reduced, but short-circuit protection is compromised and accident expansion risk increases
Solution Approach 1:
The patent introduces an isolation transformer as an intermediary component between the energy storage apparatus and the direct-current bus. This isolation transformer blocks short-circuit current propagation while allowing normal power transmission, thereby protecting the energy storage system without requiring complete system redesign
Solution Approach 2:
The patent incorporates protective devices and isolation mechanisms in advance to prevent short-circuit accidents. The isolation transformer is pre-installed to cushion against potential short-circuit risks, and protective controls are configured beforehand to limit fault current before accidents can expand
3Reliability
If traditional low-frequency transformers are used for isolation, then the isolation effect is achieved, but the electric energy passing through remains large and cannot effectively limit energy release during faults
Solution Approach 1:
The patent changes the operating frequency parameter of the transformer from traditional low-frequency (50/60Hz) to high-frequency operation. This parameter change enables the transformer to provide effective isolation while limiting the magnitude of electric energy transmission, as high-frequency transformers can be designed with smaller cores and lower power ratings for the same isolation function
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
The system effectively prevents accident expansion from short circuits and optimizes energy distribution, ensuring safe and efficient charging and discharging operations.
Implementation Method 1
an energy storage apparatus and a direct-current bus in an existing energy storage system are isolated through a high-frequency transformer
Data Source
AI summary
An energy storage charging system includes an AC/DC conversion apparatus for high-frequency isolation transform which takes electricity from a power grid and supplies electricity to a load, and a DC/DC conversion apparatus for high-frequency isolation transform which supplies electricity to a load from battery discharge. In the present invention, charging is performed by converting into direct-current electric energy through the charging AC/DC, electricity may be simultaneously discharged to a load electricity—supply bus by means of a high-frequency isolation DC/DC conversion apparatus, and at the same time, an AC/DC connected with alternating current converts alternating-current electric energy into direct-current electric energy to output to the load electricity-supply bus so as to supply electricity to the load. The charging AC/DC is isolated by means of a high-frequency isolation transformer and electric energy passing through the transformer is adjusted.