Solid State Transformer Charging System with Dynamic Power Allocation
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Solution Overview
Problem
Conventional electric vehicle charging stations face limitations in power supply capacity, leading to insufficient charging speed and increased volume and cost due to the need for larger transformers, and lack bidirectional power feeding capabilities.
Innovation Solution
An energy storage device charging system utilizing a solid state transformer structure with a conversion module, bus path, and control unit, where the total power conversion capacity is less than the total charging power capacity, allowing for efficient power allocation and bidirectional power flow, reducing system volume and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power conversion capacity of the power conversion module is increased to satisfy peak power demand, then the power supply capacity is improved, but the volume and construction cost of the transformer increase
Solution Approach 1:
The patent implements dynamic power allocation where the power conversion capacity is adjusted in real-time based on actual charging demand. The control unit dynamically distributes power among multiple charging modules, allowing the system to handle peak demands without requiring the transformer to be sized for maximum simultaneous usage of all modules. This dynamic adjustment resolves the contradiction by enabling high power supply capacity only when needed rather than maintaining it continuously.
Solution Approach 2:
The patent divides the charging system into multiple independent charging modules (first charging module, second charging module, etc.), each with its own power conversion capability. The transformer serves multiple segmented modules rather than a single large module, allowing power to be distributed and allocated dynamically. This segmentation enables the system to meet peak power demands across multiple modules without requiring the transformer volume to scale linearly with total potential demand.
2Power
If the power conversion capacity is increased to meet peak demand, then the power supply capacity is improved, but the construction cost increases
Solution Approach 1:
The control unit implements dynamic power allocation that adjusts the operational capacity of the power conversion module based on actual charging demands. This allows the system to achieve high power conversion capacity during peak periods without requiring the physical infrastructure to be sized for maximum theoretical demand, thereby reducing construction costs while maintaining the ability to meet peak power needs when they occur.
3Power
If a conventional transformer design is used, then the power conversion capacity can be increased, but bidirectional power feeding capability is lost
Solution Approach 1:
The patent designs the power conversion module to perform multiple functions: it can convert power from the transformer to charge electric vehicles, and it can also aggregate power from multiple charging modules and feed it back to the transformer for distribution to the power grid. This multi-functionality enables bidirectional power flow capability while maintaining the power conversion capacity needed to serve multiple charging modules, resolving the contradiction between power capacity and adaptability.
4Power
If the power conversion capacity is designed larger than needed, then peak power demand can be satisfied, but power loss increases during off-peak periods
Solution Approach 1:
The control unit dynamically adjusts the power conversion capacity based on real-time charging demands. During off-peak periods when charging demand is low, the system reduces the operational power conversion capacity to match actual needs, thereby minimizing power losses. During peak periods, the capacity is increased to meet demand. This dynamic adjustment resolves the contradiction by ensuring high power conversion capacity is available when needed without incurring the energy losses associated with maintaining that capacity continuously.
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 maintains stable operation during peak usage while reducing overall volume and installation costs, and enables bidirectional power flow, overcoming the limitations of traditional transformers.
Implementation Method 1
a power conversion module (1), wherein a total power conversion capacity of the power conversion module is less than a total charging power capacity of the charging module
Data Source
AI summary
An energy storage device charging system applied to a solid state transformer structure is coupled to a power grid and charges a plurality of energy storage devices, or feeds power back to the power grid from the energy storage devices. The charging system includes a conversion module, a bus path, a charging module, and a control unit. A total power conversion capacity of the conversion module is less than a total charging power capacity of the charging module. The control unit respectively allocates a plurality of demand power capacities of the charging units according to a power conversion upper limit value of the total power conversion capacity.