EV Charging Power Allocation for Uneven Vehicle Demand
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Solution Overview
Problem
Charging devices face inefficiencies when multiple vehicles with different power requirements are charged simultaneously, as slow-charged or low-power vehicles with high battery states of charge occupy power modules, leading to insufficient output power for high-power charging needs.
Innovation Solution
A charging device with a power allocation module that reallocates power modules based on vehicle power requirements, stopping charging of low-priority vehicles to free up modules for high-priority vehicles, improving overall power utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If slow-charged vehicles or low-power vehicles with high battery SOC occupy power modules for charging, then these vehicles can be charged, but the maximum power output of the charging device becomes insufficient for high-power charging needs
Solution Approach 1:
The charging device implements dynamic power module allocation where power modules are not permanently assigned to specific charging interfaces but are dynamically reassigned based on real-time charging needs. The controller monitors the charging status of all interfaces and dynamically adjusts which power modules serve which interfaces, allowing the system to adapt power distribution to current demands rather than following a fixed assignment.
Solution Approach 2:
The system changes the operational parameters of power modules by adjusting their output power levels and reassigning them between charging interfaces based on vehicle requirements. When a high-power charging need is detected, the controller can increase the power output of allocated modules and reassign modules from low-priority interfaces to high-priority interfaces, effectively changing the power parameters available at each interface.
2Productivity
If power modules are allocated to multiple charging interfaces simultaneously, then more vehicles can be charged at the same time, but power utilization efficiency decreases
Solution Approach 1:
The controller continuously monitors the charging status, power consumption, and battery state of charge of all vehicles connected to charging interfaces. This feedback information is used to dynamically adjust power module allocation, ensuring that power modules are assigned to interfaces where they can be most effectively utilized. The system learns from real-time data to optimize power distribution and minimize energy waste.
Solution Approach 2:
Power modules are designed to be universally applicable to any charging interface rather than being dedicated to specific interfaces. Each power module can serve multiple different charging interfaces at different times, performing multiple functions based on system needs. This multi-functionality allows the same power module to serve low-power vehicles at one time and high-power vehicles at another time, maximizing utilization efficiency.
Data Source
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AI summary
Embodiments of this application disclose a charging device and a power allocation method. A primary controller is configured to: obtain power information, where the power information includes an output power of each of charging interfaces and a required charging power of each of charged vehicles; and stop charging of a first target charged vehicle based on the obtained power information, and control a power allocation module to allocate, to a charging interface connected to a second target charged vehicle, a power output by a first target power module corresponding to the first target charged vehicle, where a required charging power of the second target charged vehicle is greater than an output power, existing before the first target power module is allocated, of the charging interface connected to the second target charged vehicle. In this way, one or more charged vehicles stop charging, power modules occupied by the one or more charged vehicles are released, and the released power modules are allocated to a charged vehicle whose required charging power is not met, thereby improving power utilization.