ESS-Buffered EV Charging for Stable Peak-Demand Power
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Solution Overview
Problem
The existing electric vehicle charging systems face challenges in stabilizing power supply to the grid, particularly during peak usage times, leading to inefficiencies and limitations in charging capacity, as they rely solely on the power grid without effective management of energy storage systems.
Innovation Solution
An integrated system that combines an energy storage system (ESS) with an electric vehicle charger, allowing for simultaneous charging and discharging of the ESS, and switching between discharging and charging based on the power grid's state to stabilize power supply and optimize charging efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If EV charging relies solely on power grid without ESS integration, then system complexity is reduced, but power supply stability deteriorates during peak usage times
Solution Approach 1:
The patent merges the EV charger and ESS into an integrated system where the ESS buffer stores energy from the power grid and supplies it to the charger during peak demand periods. This combination allows the system to maintain stable power supply while managing the complexity through unified control architecture that coordinates between grid power, ESS buffer, and charger operations.
2Reliability
If ESS is integrated with EV charger, then power supply stability is improved, but system complexity increases
Solution Approach 1:
The ESS buffer acts as an intermediary component between the power grid and the EV charger. It mediates power flow by storing excess grid energy and releasing it during high-demand periods, thereby stabilizing the power supply to the charger while managing system complexity through its buffering function and coordinated control with the charger.
3Productivity
If ESS discharges power to assist EV charging, then charging efficiency is improved, but ESS state of charge decreases
Solution Approach 1:
The system implements periodic charging and discharging cycles of the ESS buffer. During periods when grid power is abundant and demand is low, the ESS charges from the grid. During peak charging demand periods, the ESS discharges to assist the EV charger. This periodic operation maintains charging efficiency while preserving the ESS state of charge for sustained operation.
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
This approach enables more stable and efficient electric vehicle charging by utilizing the ESS to assist the power grid, allowing for continuous charging without interruptions and minimizing the difference in the state of charge of the ESS before and after charging, thus enhancing overall system performance and reducing grid burden.
Implementation Method 1
An energy storage system (ESS) is a system that stores electricity in a battery or the like, and supplies power to a grid and/or other things that require power charging
Data Source
AI summary
Exemplary embodiments of the present disclosure provide a method and a system for electric vehicle charging, which receive power from at least one of the power grid and the energy storage system (ESS) and perform an electric vehicle charging procedure through the charger, receive the power of at least one of the power grid and the energy storage system (ESS) and perform the charging procedure through the charger, and are capable of charging the energy storage system (ESS) from the power grid or switching from discharging to charging of the energy storage system (ESS) during the electric vehicle charging procedure.