Battery Rack Voltage Switching for Wide-Range Grid Conversion
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Solution Overview
Problem
The efficiency of energy storage systems is reduced due to voltage fluctuations at the power conversion system, causing the system to malfunction when the battery rack's voltage is outside the acceptable range.
Innovation Solution
An energy storage system incorporating a controllable switching transistor and DC/DC conversion circuit, controlled by a unit to manage voltage peaks and valleys, allowing bidirectional power flow through the power conversion system, ensuring efficient charging and discharging regardless of voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the power conversion system is configured to connect to the power grid, then the energy storage system can perform power grid frequency modulation and peak shaving, but the voltage at the power conversion system end connected to the power grid fluctuates within a large range, causing the system to malfunction when the battery rack voltage is outside the acceptable range
Solution Approach 1:
The patent introduces a voltage regulation device as an intermediary component between the power conversion system and the battery rack. This mediator actively monitors the voltage at the power conversion system end and adjusts the voltage supplied to the battery rack, ensuring it remains within the acceptable range even when grid voltage fluctuates widely. The intermediary device effectively isolates the battery rack from voltage instability caused by grid connections.
2Productivity
If the voltage at the power conversion system end is greater than the voltage that can be provided by the battery rack, then the power conversion system cannot work, but this results in reduced working efficiency of the energy storage system
Solution Approach 1:
The patent employs parameter change by dynamically adjusting the voltage output of the power conversion system through the voltage regulation device. When the grid voltage exceeds the battery rack's acceptable range, the regulation device modifies the voltage parameter to match the battery rack's requirements, enabling continuous operation. This parameter adjustment allows the system to maintain high working efficiency across varying voltage conditions.
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
Maintains high efficiency by enabling the system to operate within a wide voltage range, optimizing energy utilization and grid compatibility, and preventing voltage-related malfunctions.
Implementation Method 1
control the controllable switching transistor to be turned on, so that the DC/DC conversion circuit stops working, to charge or discharge the energy storage unit by using the power conversion system
Implementation Method 2
a first end of the DC/DC conversion circuit is connected to the energy storage unit, a second end of the DC/DC conversion circuit is connected to the first end of the power conversion system
Data Source
AI summary
An energy storage system. A control unit is configured to: when a voltage of an energy storage unit is greater than a voltage peak of an end that is of a power conversion system and that is configured to connect to a grid connection point, control a switching transistor to be turned-on, so that a DC/DC conversion circuit stops working. The power conversion system is configured to charge or discharge the energy storage unit by using the switching transistor. The control unit is configured to: when the voltage of the energy storage unit is less than the voltage peak of the end that is of the power conversion system and that is configured to connect to the grid connection point, control the switching transistor to be turned off, to charge or discharge the energy storage unit by using the DC/DC conversion circuit and the power conversion system.