Dynamic Charging Current Allocation for EV Stations
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Charging stations often operate below their maximum capacity due to uneven power distribution among multiple charging points, leading to inefficient resource utilization and increased costs, as existing load management methods rely on forecasts and fixed sequences rather than real-time resource allocation.
Innovation Solution
A method that dynamically adjusts the charging current reservation at each charging point based on real-time resource availability, determining the maximum permissible target charging current considering both the charging cable specifications and the charging station's hardware limitations, and optimally allocates resources across all points to ensure vehicles receive the highest possible charging current without exceeding available capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the charging station is designed for maximum power at every charging point, then the nominal power is high, but the charging station is oversized and unnecessarily expensive
Solution Approach 1:
The charging station implements dynamic load management that adjusts power allocation in real-time based on actual demand. The control system continuously monitors the number of connected vehicles and their charging requirements, dynamically redistributing available power to meet actual needs rather than maintaining fixed maximum capacity at each point.
Solution Approach 2:
The system changes operational parameters (power distribution ratios) based on real-time conditions. When multiple vehicles are connected, the control unit calculates and adjusts the charging current for each vehicle dynamically, allowing the station to operate efficiently at various power levels rather than always at maximum capacity.
2Ease of operation
If load management is implemented with fixed sequences or forecasts, then resource allocation is predetermined, but real-time resource utilization is inefficient
Solution Approach 1:
The control system continuously monitors actual charging current draw from each vehicle and uses this feedback to adjust power allocation in real-time. The system measures actual demand and dynamically redistributes power to maximize utilization, rather than relying on predetermined schedules or forecasts.
Solution Approach 2:
While implementing real-time adjustment, the system performs preliminary calculations of power distribution based on vehicle requirements and station capacity before actual charging begins. The control unit pre-calculates optimal power allocation scenarios and adjusts them dynamically as conditions change.
3Power
If the charging station allocates maximum power to first-connected vehicles, then early vehicles receive optimal charging current, but later vehicles receive reduced power
Solution Approach 1:
The system applies different power allocation strategies to different vehicles based on their specific requirements, connection time, and current station load conditions. Rather than uniform treatment, each vehicle receives locally optimized power allocation that considers both its individual needs and the overall station utilization.
Solution Approach 2:
Power allocation is dynamically adjusted as vehicles connect and disconnect. The control system continuously recalculates optimal distribution, allowing later vehicles to receive adequate power when station load decreases, rather than being permanently limited by initial allocation decisions.
4Loss of time
If the charging station uses empirical load forecasts, then resource planning is based on historical data, but actual real-time allocation is inaccurate
Solution Approach 1:
The system replaces forecast-based planning with real-time feedback from actual charging current measurements. The control unit continuously monitors actual power consumption and adjusts allocation accordingly, eliminating the inaccuracies inherent in empirical forecasting methods.
Data Source
Figure 1
Figure 2
AI summary
A method for charging an electrically powered vehicle (FZi) at a charging point (LPi) of a charging station (LS) having a plurality of charging points (LP1, LP2, ... LPn) and connected to a supply network (VN), comprising the following steps: - taking into account a maximum permissible charging cable current iLKi,max on the part of a charging cable (LKi) and taking into account a maximum permissible limit charging current iLPi,zul on the part of the charging point (LPi) of the charging station (LS), a maximum permissible target charging current iLi,max for charging the vehicle is determined; - the maximum permissible target charging current iLi,max is communicated to the vehicle (FZi) by the charging station;- an actual charging current iIst,i, which is set via a charger provided in the vehicle (FZi) taking into account the maximum permissible target charging current iLimax and a vehicle-side maximum permissible vehicle charging current iFZi,zul for the charging point (LPi), is measured on the side of the charging station (LS);wherein a charging current reservation is carried out at the charging station (LS) for the charging point (LPi) in the amount of a maximum available limit charging current iLPi,max specified for the charging point (LPi) by the hardware of the charging point (LPi) and/or the maximum permissible target charging current iLi,max offered to the vehicle (FZi), wherein a charging current difference is determined between the maximum permissible target charging current iLi,max offered to the vehicle (FZi) by the charging station (LS) or the maximum available limit charging current iLPi,max on the one hand and the measured actual charging current iIst,i on the other hand and wherein the charging current reservation is released with respect to the determined charging current difference.