EV Charging Station Power Control for Thermal Load Balancing
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Solution Overview
Problem
Charging stations for electric vehicles often experience reduced or interrupted charging capacity due to critical temperature states in power electronics components, which are exacerbated by overload conditions in climate conditioning devices, leading to inconvenient delays and reduced system availability.
Innovation Solution
A method to dynamically adjust the charging capacity of a charging station based on the load state of its climate conditioning device, coordinating the operation of both systems to prevent overload states and maintain continuous operation by influencing the charging capacity in response to thermal loads, thereby extending the operational readiness of the climate conditioning device and reducing the risk of overtemperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the charging capacity is increased to meet user demand, then the productivity of the charging station is improved, but the climate conditioning device may enter an overload state causing temperature limits to be reached
Solution Approach 1:
The charging capacity is dynamically adjusted based on the load state of the climate conditioning device. The control device continuously monitors the climate conditioning device's load state and modifies the charging capacity in real-time, transitioning from a static to a dynamic control approach that prevents overload while maximizing charging throughput when conditions permit.
Solution Approach 2:
A feedback mechanism is implemented where the control device monitors the load state of the climate conditioning device and uses this information to adjust the charging capacity. The system continuously receives feedback about the climate conditioning device's thermal state and responds by modulating the charging power, creating a closed-loop control system that balances productivity and reliability.
2Reliability
If the charging capacity is reduced to prevent temperature limits, then the reliability of the power electronics is improved, but the productivity and user convenience deteriorate
Solution Approach 1:
Rather than applying a static reduction in charging capacity, the system uses dynamic adjustment where the charging power is continuously adapted to the current thermal conditions. This allows the system to maintain high charging rates when the climate conditioning device has sufficient cooling capacity while only reducing power when thermal limits are approached, thereby minimizing the impact on productivity.
Solution Approach 2:
The system proactively monitors the load state of the climate conditioning device and adjusts the charging capacity before temperature limits are reached. By detecting the load state in advance and preemptively modulating the charging power, the system prevents overheating conditions while avoiding the need for drastic capacity reductions that would harm productivity.
3Temperature
If the climate conditioning device is operated at high capacity to cool power electronics, then the temperature control is improved, but the device may enter overload state reducing its operational readiness
Solution Approach 1:
The charging capacity is dynamically modulated to match the cooling capacity of the climate conditioning device. By continuously adapting the thermal load imposed on the climate conditioning device to its current operational state, the system ensures effective cooling of power electronics while preventing the climate conditioning device from entering overload conditions that would compromise its availability.
Data Source
AI summary
A method for operating a charging station, control device for carrying out such a method and charging station with such a control deviceThe invention relates to a method for operating a charging station (1), in particular for electric vehicles, whereina load state of a climate conditioning device (7) of the charging station (1) is determined, and whereina charging capacity of the charging station (1) is influenced depending on the determined load state.