EV Charge Current Allocation Under Grid Capacity Limits
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Solution Overview
Problem
Existing charge systems for electric vehicles lack efficient management of charging currents, leading to potential overloads when multiple charge facilities simultaneously charge vehicles, which can exceed the rated capacity of electrical infrastructure.
Innovation Solution
A charge control device that allocates charging current values to each charge facility, ensuring that the total current does not exceed a predetermined upper limit by distinguishing between facilities supplying and not supplying current, and adjusting allocations accordingly to prevent overload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If each charge facility charges its corresponding electric vehicle at a maximum suppliable charging current, then the charging speed of each vehicle is maximized, but the total charging current exceeds the rated capacity of the electrical infrastructure causing overload
Solution Approach 1:
The charge control device dynamically adjusts the charging current for each charge facility based on real-time conditions. The determiner calculates appropriate current values that change over time to balance charging speed requirements with the overall electrical capacity constraints, transforming static maximum current allocation into dynamic adaptive current management.
Solution Approach 2:
The system changes the charging current parameter for each charge facility from a fixed maximum value to a controlled variable value. The determiner computes specific current values that satisfy both the charging performance requirements and the total capacity constraint, thereby optimizing the charging process while preventing overload.
2Ease of operation
If the charge control device allocates charging current values to all charge facilities including those not currently supplying current, then the system prepares for rapid charging when vehicles are connected, but the total current allocation may exceed the upper limit value
Solution Approach 1:
The determiner pre-calculates and allocates first current values to charge facilities that are not currently supplying current, preparing them for rapid charging when vehicles are connected. This preliminary allocation enables quick charging response while the determiner ensures the total allocated current remains within the upper limit value.
Solution Approach 2:
The charge control device continuously monitors the charging status of all facilities and adjusts current allocations based on feedback from the determiner. When charge facilities transition from not supplying current to supplying current, the system receives feedback and recalculates allocations to maintain compliance with the upper limit value.
Data Source
AI summary
A charge control device includes a first communicator, a determiner, and a controller. The determiner is configured to make an allocation of one or more first current values respectively to one or more charge facilities which are included in the plurality of charge facilities and each of which is not supplying a charging current. The determiner is configured to make an allocation of one or more second current values respectively to one or more charge facilities which are included in the plurality of charge facilities and each of which is supplying the charging current and determine the allocation of the one or more first current values and the allocation of the one or more second current values such that a total of the one or more first current values and the one or more second current values does not exceed an upper limit value which is predetermined.