Series Energy Storage System for Extended Backup Power Duration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The limited power capacity of backup input power sources in dual-input power supply systems restricts the duration for which they can provide power to electrical equipment, necessitating an enhancement in power supply time.
Innovation Solution
An energy storage system comprising two energy storage devices connected in series, where one device charges the other when the primary power source is normal, and switches to its own stored power when the primary source is abnormal, with control circuits managing the power output based on the primary source's state to extend the discharge capacity and supply time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a backup input power source is used to ensure stable operation during main power failure, then reliability is improved, but the power supply duration is limited due to limited power capacity
Solution Approach 1:
The backup power system is segmented into multiple independent energy storage devices (first energy storage device and second energy storage device) connected in series. Each device has its own energy storage circuit and control circuit, allowing independent operation and charging. This segmentation enables the system to extend power supply duration by combining the capacities of multiple devices while maintaining reliability through distributed architecture.
Solution Approach 2:
The energy storage devices are charged in advance during normal operation when the main power source is available. The first energy storage device charges from the main power source, and simultaneously charges the second energy storage device through its output terminal. This preliminary charging action ensures that energy is stored before failure occurs, extending the duration of backup power supply when the main power fails.
2Duration of action of moving object
If multiple energy storage devices are connected in series to extend power supply duration, then power supply time is improved, but device complexity increases
Solution Approach 1:
Each energy storage device is designed with multi-functionality: the first energy storage device serves both as a backup power source and as a charging source for the second energy storage device. The output terminal of the first device can function as both a power output to the load and a power input to the second device. This universal design reduces the need for separate dedicated charging circuits, simplifying the overall system despite having multiple devices.
Solution Approach 2:
The system implements self-service charging where the first energy storage device automatically charges the second energy storage device during normal operation without requiring external control or additional charging infrastructure. The control circuit detects the charging state and manages the power flow automatically, reducing the need for complex external control systems and simplifying deployment.
Data Source
AI summary
An energy storage system and a power supply method thereof are provided. First and second energy storage devices are connected in series between an AC power source and a load. When the AC power source is normal, the AC power source is used to charge the first energy storage device and provided to the second energy storage device for charging. When the AC power source is abnormal, an output of the first energy storage device is switched from the AC power source to a first energy storage power source, and the second energy storage device is disabled from using the first energy storage power source for charging. A power source provided by the first energy storage device or a second energy storage power source provided by the second energy storage circuit is output to the load according to a power supply state of the first energy storage device.