Energy Storage Cabinet Cooling Power for LVRT and Black Start
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Solution Overview
Problem
Microgrids equipped with energy storage cabinets face challenges in supporting low voltage ride-through scenarios and off-grid black start scenarios due to the reliance on power from the national grid, leading to thermal runaway risks and increased costs and volume when uninterruptible power supplies (UPS) and batteries are used.
Innovation Solution
An energy storage cabinet with an additional power converter between the energy storage apparatus and air conditioning system, allowing the power converter to supply power during low voltage ride-through and off-grid black start scenarios, using a direct current-to-direct current circuit with small rated power to support transient power needs, and integrating the converter within the air conditioning system or energy balance module.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the air conditioning system obtains power from the power grid, then the air conditioning system can work normally, but the air conditioning system cannot work when the power grid is abnormal
Solution Approach 1:
The patent introduces a power converter as an intermediary component between the energy storage apparatus and the air conditioning system. This power converter acts as a mediator that can supply power to the air conditioning system when the power grid is abnormal, enabling the system to operate during low voltage ride-through scenarios and off-grid black start scenarios without requiring frequent battery maintenance
2Reliability
If uninterruptible power supplies (UPS) and batteries are used to support abnormal grid conditions, then power supply continuity is improved, but costs and volume increase
Solution Approach 1:
The patent makes the power converter multi-functional by enabling it to serve dual purposes: normal power conversion during grid-connected operation and emergency power supply during abnormal grid conditions. This eliminates the need for separate UPS and battery systems, reducing both volume and cost while maintaining power supply continuity
Solution Approach 2:
The patent changes the operational parameters of the power converter to enable it to handle transient power needs during abnormal conditions. By adjusting voltage and current parameters dynamically, the power converter can provide uninterrupted power to the air conditioning system without requiring oversized capacity components
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
Enables uninterrupted power supply to the air conditioning system, reducing costs and volume, while maintaining heat dissipation and grid connection during abnormal grid conditions, without the need for frequent battery maintenance.
Implementation Method 1
The power converter is configured to: convert electric energy of the energy storage apparatus into a second voltage, and provide the second voltage to the first power supply loop
Implementation Method 2
The conversion circuit is configured to: when a voltage amplitude of the power grid is greater than a specified threshold, convert an alternating current provided by the power grid into a first voltage, and provide the first voltage to the first power supply loop
Implementation Method 3
an air conditioning system for heat dissipation is also disposed in the energy storage cabinet
Data Source
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AI summary
Embodiments of this application disclose an energy storage cabinet. An additional power converter is added between an energy storage apparatus and an air conditioning system, to meet a power supply requirement of the air conditioning system in a case of a low voltage ride-through and an off-grid black start. In the case of the low voltage ride-through and the off-grid black start, the power converter converts electric energy of the energy storage apparatus to supply power to the air conditioning system. After a voltage of a power grid is normal or a start is completed, a conversion circuit in the air conditioning system is configured to obtain power from the power grid. Because the power converter works for a very short time, the power converter may use a direct current-to-direct current circuit that has a relatively small rated power and supports a relatively large transient power, to support a low voltage ride-through scenario and an off-grid black start scenario with low costs.