Power Storage Apparatus for Uninterrupted Grid Disconnection
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Solution Overview
Problem
Power storage systems face challenges in maintaining reliable power supply during grid disruptions, as they rely on variable renewable energy sources and are vulnerable to power outages due to breakdowns in power providers or grids, necessitating a solution for uninterrupted power delivery to loads.
Innovation Solution
A power storage apparatus with a power conversion unit, bi-directional converter, bi-directional inverter, grid connector, battery management system, and integrated controller that converts and manages power between a power generation system, grid, and load, allowing for disconnection from the grid during abnormalities and simultaneous charging and discharging of batteries to ensure continuous power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power storage system relies on variable renewable energy sources and grid connection, then power generation capacity is improved, but reliability of power supply deteriorates during grid disruptions
Solution Approach 1:
The battery system is divided into multiple battery units (first battery unit, second battery unit, third battery unit) that can be independently controlled. This segmentation allows selective charging and discharging of specific battery units based on system needs, enabling the system to maintain reliability during grid disruptions by optimizing power distribution from available sources.
Solution Approach 2:
The system dynamically adjusts the operating mode of battery units based on real-time conditions. The controller can switch between charging mode (when grid or renewable power is available) and discharging mode (when grid fails), and can selectively activate specific battery units. This dynamic adaptation resolves the contradiction by making the system flexible enough to maintain reliability while utilizing variable renewable energy sources.
2Reliability
If the system disconnects from the grid during abnormal states, then reliability of power supply to load is improved, but loss of power generation capacity deteriorates
Solution Approach 1:
The system performs preliminary charging of battery units during normal grid operation or when renewable energy is available. By storing energy in advance in the battery units, the system ensures that sufficient power capacity is available when grid disconnection becomes necessary, thus maintaining both reliability during abnormal states and preserving power generation capacity through prior energy accumulation.
Solution Approach 2:
The battery units act as an intermediary energy storage medium between the power generation system and the load. During grid abnormal states, the batteries mediate by supplying power to the load while the power generation system continues to generate power (which can be stored in batteries). This intermediary role allows the system to maintain both reliability for the load and preserve generation capacity without direct grid connection.
3Duration of action of moving object
If multiple battery units are used for power storage, then capacity for uninterrupted power supply is improved, but device complexity increases
Solution Approach 1:
The power storage system is segmented into multiple independent battery units (first, second, third battery units) rather than using a single large battery. This segmentation extends the duration of uninterrupted power supply by allowing sequential or parallel operation of multiple units. The complexity is managed through modular design where each unit can be independently controlled by the controller, making the increased complexity manageable and beneficial for extending power supply duration.
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 solution enables stable and continuous power supply to loads during abnormal grid states by managing battery charging and discharging, acting as an uninterruptible power supply (UPS) and maintaining grid stability through intelligent control of power flow.
Implementation Method 1
a power conversion unit connected between a power generation system and a first node, where the power conversion unit is configured to convert power generated by the power generation system into a DC voltage for the first node
Implementation Method 2
a bi-directional converter connected between the BMS and the first node, where the bi-directional converter is configured to convert the DC voltage of the first node to a DC voltage for the BMS and to convert the DC voltage of the BMS to the DC voltage of the first node
Implementation Method 3
a bi-directional inverter connected between the first node and a second node, where the bi-directional inverter is configured to invert the DC voltage of the first node into an AC voltage for a load or for a power grid and to convert an AC voltage from the power grid into the DC voltage of the first node
Implementation Method 4
a battery configured to be charged by power from the power generation system and from the grid, and to be discharged to supply power to the load
Data Source
AI summary
A power storage system and method are disclosed. The system is connected to a load, a power grid, and a power generation system. When the grid is in an abnormal state, a battery is simultaneously charged with power from the power generation system and used to supply power to the load.