EV Power Management Using SOC and Cargo Weight Selection
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Solution Overview
Problem
Conventional energy management systems for airports do not effectively utilize electric power from electric vehicles to balance supply and demand, leading to potential disturbances in vehicle operations.
Innovation Solution
A power management system that selects electric vehicles with surplus capacity based on State of Charge (SOC) and cargo weight to supply power to the facility's electric power system, while adjusting the lower limit SOC to ensure smooth operation and maximize power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If electric vehicles supply power to the electric power system without considering cargo weight, then power supply capacity is maximized, but vehicle operation reliability deteriorates
Solution Approach 1:
The system dynamically adjusts the lower limit SOC based on cargo weight parameters. When cargo weight is light, the lower limit SOC is reduced, allowing greater power discharge capacity. When cargo weight is heavy, the lower limit SOC is maintained at a higher level to ensure sufficient power for vehicle operation. This parameter adjustment resolves the contradiction by adapting power supply capacity to actual vehicle needs.
Solution Approach 2:
The system performs preliminary assessment of cargo weight and SOC before authorizing power supply to the electric power system. By evaluating these parameters in advance and setting appropriate lower limit SOC thresholds, the system ensures that power discharge will not compromise vehicle operation reliability, thus resolving the contradiction between maximizing power supply and maintaining operational reliability.
2Power
If the lower limit SOC is reduced to maximize power discharge, then power supply to the electric power system is improved, but the risk of battery discharge insufficiency increases
Solution Approach 1:
The system changes the lower limit SOC parameter dynamically based on cargo weight conditions. When cargo weight is light, the lower limit SOC is reduced to enable greater power discharge capacity. When cargo weight is heavy or operation demands are high, the lower limit SOC is maintained at a higher level to prevent battery discharge insufficiency. This dynamic parameter adjustment resolves the contradiction between maximizing power supply and ensuring sufficient battery capacity for vehicle operation.
3Ease of operation
If electric vehicles are selected for power supply based only on SOC, then power supply selection is simplified, but operational smoothness deteriorates
Solution Approach 1:
The system uses cargo weight as an additional parameter to determine the lower limit SOC threshold for power supply eligibility. This creates a clear, objective criterion for selecting vehicles suitable for power supply while ensuring operational smoothness. Vehicles with light cargo and sufficient SOC are automatically identified as suitable for power supply, simplifying selection while maintaining operational reliability through the cargo weight-based threshold adjustment.
Data Source
AI summary
A power management system manages an exchange of electric power between power storage devices of a plurality of electric vehicles which respectively transport a cargo at least in a facility, and a charging and discharging device connected to an electric power system of the facility. The power management system includes a vehicle management device. The vehicle management device is configured to select the electric vehicle with surplus capacity for a discharge from the power storage device based on SOC of the power storage device of each of the electric vehicles and the weight of the cargo of each of the electric vehicles when an electric power supply from at least one of the electric vehicles to the electric power system is requested. Further, the vehicle management device is configured to instruct the selected electric vehicle to discharge from the power storage device to the electric power system.