EV Charge-Discharge Management via Inter-Vehicle Electricity Exchange
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Solution Overview
Problem
Existing charge-discharge management systems for multiple electric vehicles do not effectively maximize consumer profit by not considering inter-vehicle electricity exchange and dynamic pricing, leading to suboptimal charging and discharging strategies.
Innovation Solution
A charge-discharge management system that allows electric vehicles to exchange electricity with each other through a central facility, with a management device controlling charging and discharging actions based on electricity buying and selling prices to minimize costs and maximize profit, by switching between facility charging and inter-vehicle charging/discharging according to price fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the charge-discharge management device only uses facility charging without inter-vehicle electricity exchange, then the system is simple to operate, but consumer profit is not maximized
Solution Approach 1:
Electric vehicles serve each other by exchanging electricity directly through the charge-discharge facility, eliminating the need for centralized facility charging in all cases. Each vehicle can discharge to others who need charging, creating a self-sufficient system that reduces dependency on external grid charging and maximizes profit by avoiding electricity purchase costs.
2Reliability
If the system always charges from the charge-discharge facility, then charging is reliable, but electricity costs increase
Solution Approach 1:
The charge-discharge management device dynamically switches between facility charging and inter-vehicle electricity exchange based on real-time conditions such as electricity prices, vehicle availability, and charging需求的. This dynamic approach ensures reliable charging by using the facility as a backup while prioritizing cost-free inter-vehicle exchange when possible, thereby reducing electricity costs while maintaining charging reliability.
3Loss of energy
If the system discharges to the electric power system during high selling prices, then consumer profit increases, but the system complexity increases
Solution Approach 1:
The charge-discharge management device incorporates feedback mechanisms that continuously monitor electricity selling prices, vehicle battery states, and discharge需求的. When the selling price exceeds a predetermined threshold and discharge conditions are met, the system automatically executes discharge operations. This feedback-driven approach simplifies the control complexity by using clear price thresholds and automated decision-making, while still capturing profit opportunities from high-price discharge periods.
4Loss of energy
If inter-vehicle electricity exchange is implemented, then electricity cost is reduced, but the device complexity increases
Solution Approach 1:
The charge-discharge facility serves multiple functions: it acts as a charging station for vehicles, a discharge destination for excess electricity, and an intermediary for inter-vehicle electricity exchange. This multi-functionality eliminates the need for separate dedicated infrastructure for each function, thereby reducing overall system complexity while enabling cost-effective inter-vehicle electricity exchange and grid interaction.
Data Source
AI summary
A charge-discharge management system according to the present disclosure includes a plurality of electric vehicles wherein each electric vehicle has a storage battery, a charge-discharge facility that charges and discharges the storage batteries of the plurality of electric vehicles, and a charge-discharge management device that controls charging and discharging actions of the charge-discharge facility. Each electric vehicle of the plurality of electric vehicles is configured to exchange electricity of the storage battery of the electric vehicle of the plurality of electric vehicles by another electric vehicle through the charge-discharge facility. The charge-discharge management device switches, according to an electricity buying price, a charging action between an action of charging the storage batteries of the plurality of electric vehicles by the charge-discharge facility and an action of charging the storage batteries of the plurality of electric vehicles by exchanging electricity of the storage batteries between the plurality of electric vehicles.