EV Charging Dispenser Current Budget Sharing Under Power Limits
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Solution Overview
Problem
Existing electric vehicle charging systems face limitations in efficiently managing power distribution among multiple charging stations, leading to suboptimal power allocation and potential overcurrent issues when adding or removing charging dispensers, which can disrupt the overall operation.
Innovation Solution
A system where each charging dispenser is assigned a current budget, allowing them to communicate and share current budgets through a network, ensuring the total current remains within a predefined maximum, enabling seamless addition or removal of dispensers without disrupting the operation of others.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple charging dispensers are connected to the same power supply source, then the charging capacity of the system is improved, but the risk of overcurrent and power distribution management complexity increases
Solution Approach 1:
Each charging dispenser autonomously determines its own offered current by receiving total current budget information from other dispensers and calculating its share according to a predefined algorithm. This decentralized self-service approach eliminates the need for centralized power distribution management while ensuring total current remains within the maximum limit.
Solution Approach 2:
The system implements a feedback mechanism where each charging dispenser transmits its current budget and charging output information to other dispensers via a communications network. This feedback loop enables each dispenser to adjust its current output based on the overall system state, maintaining power distribution efficiency without centralized control.
2Adaptability or versatility
If charging dispensers are added or removed from the system, then the system's adaptability is improved, but the stability of power distribution and operation of other dispensers may be disrupted
Solution Approach 1:
The system dynamically adapts to changes in the number of charging dispensers through repeated execution of the current determination algorithm. Each dispenser continuously receives updated total current budget information and recalculates its offered current, allowing seamless integration of new dispensers or removal of existing ones without disrupting overall system operation.
Solution Approach 2:
The system handles dynamic configuration changes by modifying the total current budget parameter based on the number of active dispensers. When dispensers are added or removed, the total current budget is recalculated and redistributed among the remaining dispensers, maintaining operational stability while adapting to new system configurations.
3Measurement precision
If a centralized system controls power distribution among charging dispensers, then power allocation precision is improved, but the system complexity and communication overhead increase
Solution Approach 1:
The centralized power distribution control is segmented and distributed to individual charging dispensers. Each dispenser independently calculates its offered current based on the total current budget information received from other dispensers, eliminating the need for a centralized control system while maintaining precise power allocation through the standardized communication protocol.
Data Source
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Figure 1B
Figure 1C
AI summary
The invention relates to a system for charging electric vehicles, said system comprising a plurality of charging stations which each comprise one or more charging dispensers that are connected to a common power line, wherein each of said charging dispensers has a current budget assigned thereto, wherein the sum of said current budgets is greater than zero and less than a predefined maximum total current that the system is allowed draw from the power line, wherein the charging dispensers are in communication with each other such that at each charging dispenser a total current budget can be calculated as a sum of all current budgets of, and such that at each charging dispenser it can be determined what share this total current budget is available to the dispenser for charging an electric vehicle connected thereto.