EV Charging Station with Intermediate Energy Buffer for Grid Stability
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Solution Overview
Problem
Existing electric vehicle charging stations face challenges in efficiently and quickly charging multiple vehicles simultaneously due to limitations in energy supply from the electrical network, and they lack the capability to support the grid during faults or frequency imbalances.
Innovation Solution
An electric vehicle charging station equipped with an intermediate energy store and a control unit that manages energy from the network, allowing for temporary storage and release of energy to support both vehicle charging and grid stability, enabling efficient charging even when network energy is insufficient and aiding in grid stabilization during faults.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple electric vehicles are charged simultaneously from the electrical energy supply network, then the charging speed increases, but the energy supply network cannot provide sufficient power
Solution Approach 1:
The patent applies preliminary action by charging the intermediate energy store in advance during periods of low demand or when network power is sufficient. The control unit monitors the state of charge and prepares energy ahead of time, so when multiple vehicles need simultaneous charging, the pre-stored energy is immediately available, enabling fast charging without overloading the network.
Solution Approach 2:
The intermediate energy store acts as an intermediary between the electrical energy supply network and the electric vehicles. It buffers the power flow, decoupling the vehicles' high power demand from the network's limited supply capacity. The control unit manages this intermediary storage to balance network constraints with vehicle charging requirements.
2Reliability
If the charging station uses only the electrical energy supply network for charging, then the device complexity is low, but the reliability during network faults decreases
Solution Approach 1:
The patent implements beforehand cushioning by maintaining an intermediate energy store with sufficient charge capacity to cover potential network failures. The control unit continuously monitors the state of charge and ensures the buffer is adequately filled during normal operation, creating a safety cushion that protects against network faults and ensures charging continuity.
Solution Approach 2:
The intermediate energy store serves as an intermediary that provides backup power during network faults. This additional component increases system reliability by decoupling vehicle charging from network availability, though it does increase device complexity through the added storage and control infrastructure.
3Reliability
If the intermediate energy store is used to support the network during faults, then the grid stability improves, but the energy available for vehicle charging decreases
Solution Approach 1:
The control unit employs feedback by continuously monitoring both the intermediate energy store's state of charge and the electrical energy supply network's status. Based on this feedback, it intelligently decides whether to charge vehicles from the intermediate store or allow the intermediate store to support the network, dynamically balancing vehicle charging needs with grid stability requirements.
Solution Approach 2:
The system applies dynamics by making the energy distribution flexible and adaptive. The control unit can dynamically switch between different operational modes: charging vehicles from the intermediate store, charging the intermediate store from the network, or using the intermediate store to support the network during faults. This dynamic behavior allows the system to optimize energy allocation based on real-time 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
Ensures efficient and quick charging of multiple electric vehicles by utilizing the intermediate energy store, and actively supports the electrical grid by absorbing or releasing energy during frequency imbalances, ensuring reliable and stable energy distribution.
Implementation Method 1
an intermediate energy store (110) for temporarily storing energy
Implementation Method 2
The control unit is designed to forward energy from the intermediate energy store to the output connections if the energy required at the output connections cannot be made available in full via the interface of the electrical energy supply network
Implementation Method 3
the control unit is designed to initiate energy consumption from the energy supply network by the buffer store or energy release from the buffer store into the energy supply grid depending on a fault in the power supply grid
Data Source
Figure 1~2
AI summary
An electric vehicle charging station is proposed having an interface (I) via which the charging station receives energy by means of an electrical energy supply grid (1000), an energy buffer device (110) for buffering energy transmitted or received from the electrical energy supply grid (1000) via the interface (I), a multiplicity of output connections (101-106) for charging electric vehicles, and a control unit (120) for controlling the buffering of energy in the energy buffer device (110) and for controlling the outputting of energy via the output connections (101-106). The control unit (120) is designed to pass on energy from the energy buffer device (110) to the output connections (101-106) if the energy required at the output connections (101-106) cannot be made available completely by the electrical energy supply grid (1000) via the interface (I).