Flywheel Storage for EV Charging Load Balancing
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Solution Overview
Problem
Electric vehicle fast charging stations (EVFCSs) face challenges in managing unpredictable power demand fluctuations, leading to load imbalances on the AC grid, which can result in high costs due to discrepancies between electricity generation, distribution, and consumption, especially with multiple independent players involved in the system.
Innovation Solution
A station equipped with a control circuit, bidirectional interface, and multiple flywheel-based electrical storage units that dynamically adjust power draw and supply to maintain a balanced load by charging or discharging energy based on threshold values, ensuring efficient power management and grid stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If EVFCS provides rapid charging to plug-in vehicles, then charging speed and service quality are improved, but power draw fluctuations increase causing load imbalance on the AC grid
Solution Approach 1:
The system performs preliminary action by charging the electrical storage unit in advance during periods of low power demand (when power draw is below the first threshold). This stored energy is then utilized during peak charging demand periods, preventing load imbalance on the AC grid while maintaining rapid charging capability.
Solution Approach 2:
The electrical storage unit acts as an intermediary between the AC grid and the EVFCS load. It buffers the power draw fluctuations by absorbing excess power when demand is low and releasing power when demand is high, thereby stabilizing the load on the AC grid while enabling rapid charging.
2Productivity
If EVFCS draws high power for rapid charging, then charging efficiency is improved, but cost increases due to discrepancies in electricity generation and distribution
Solution Approach 1:
The system performs preliminary action by charging the electrical storage unit in advance during periods of low power demand (when power draw is below the first threshold). This stored energy is then utilized during peak charging demand periods, preventing load imbalance on the AC grid while maintaining rapid charging capability.
Solution Approach 2:
The control circuit continuously monitors the power draw from the AC grid and the state of charge of the electrical storage unit. Based on this feedback, it dynamically adjusts the charging/discharging strategy to maintain power draw within acceptable thresholds, thereby reducing costs associated with load balance discrepancies while ensuring charging efficiency.
3Stability of the object's composition
If EVFCS uses on-board electrical storage to stabilize load, then grid stability is improved, but device complexity increases
Solution Approach 1:
The electrical storage unit serves multiple functions: it stabilizes the load on the AC grid, enables rapid charging during peak demand, and reduces costs by avoiding load balance discrepancies. This multi-functionality justifies the added complexity by delivering multiple benefits from a single component.
Solution Approach 2:
The system changes the operational parameters of the EVFCS by introducing an electrical storage unit that can be charged and discharged. This parameter change (adding energy storage capacity) transforms the system from one that directly draws power from the grid to one that can buffer and regulate power draw, thereby stabilizing the load.
4Stability of the object's composition
If EVFCS maintains constant power draw from DSO, then grid balance is improved, but ability to handle unpredictable EV arrival and charging demand decreases
Solution Approach 1:
The system achieves dynamic operation by allowing the electrical storage unit to switch between charging and discharging modes based on real-time conditions. The control circuit monitors both the power draw threshold and the state of charge, dynamically adjusting the system's behavior to maintain power draw consistency while adapting to unpredictable EV charging demand.
Solution Approach 2:
The system performs preliminary action by charging the electrical storage unit in advance during periods of low power demand (when power draw is below the first threshold). This stored energy is then utilized during peak charging demand periods, preventing load imbalance on the AC grid while maintaining rapid charging capability.
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 effectively stabilizes power demand, reduces costs by optimizing energy storage and distribution, and enables EVFCSs to provide ancillary services to the grid, such as absorbing or providing power during peak demands, thereby improving overall grid balance and efficiency.
Implementation Method 1
A station equipped with a control circuit, bidirectional interface, and multiple flywheel-based electrical storage units that dynamically adjust power draw and supply
Data Source
AI summary
A station constituted of: a control circuit; a first and a second bi-directional converter, each in communication with the control circuit, each arranged to be coupled to a respective plug-in electrical vehicle at a respective first port thereof; and a connection to an AC grid, wherein the control circuit is arranged to: draw electrical energy from a first plug-in electrical vehicle coupled to the first port of the first bi-directional converter; and provide at least some of the drawn electrical energy to a second plug-in electrical vehicle coupled to the first port of the second bi-directional converter.