EV Charging Station Power Control for Air Conditioning Load Limits
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Solution Overview
Problem
Charging stations for electric vehicles often face disruptions due to critical temperature states in power electronics, leading to drastic reductions in charging power or interruptions, which are inconvenient and reduce system availability.
Innovation Solution
A method to dynamically adjust charging power based on the load state of the air conditioning device, avoiding overload conditions by coordinating the operation of the charging station with secondary consumers to maintain optimal cooling capacity and extend the service life of components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the charging power is increased to meet user demand, then the productivity and user satisfaction improve, but the temperature of power electronic components rises leading to critical temperature states and charging interruptions
Solution Approach 1:
The patent merges the control of charging power with the operation of secondary consumers and air conditioning device into a unified control strategy. The control device coordinates all these elements together to manage thermal load, preventing critical temperature states while maintaining high charging power when possible.
Solution Approach 2:
The patent implements dynamic control where the charging power is continuously adjusted based on real-time temperature conditions, load state, and air conditioning capacity. This dynamic adaptation allows the system to operate at high power when cooling is sufficient and reduce power only when necessary to prevent overheating.
2Temperature
If the air conditioning device operates at high capacity to cool power electronics, then the temperature control improves, but the air conditioning device enters overload state and must be switched off
Solution Approach 1:
The patent applies preliminary action by proactively managing the thermal load before the air conditioning device reaches its maximum capacity. The control device monitors the load state and adjusts charging power and secondary consumer operation in advance to prevent air conditioning overload, ensuring continuous operation and avoiding sudden switch-offs.
Solution Approach 2:
The patent implements feedback control where the control device continuously monitors the load state of the air conditioning device and adjusts the charging power and secondary consumer operation accordingly. This closed-loop control prevents the air conditioning device from entering overload states by responding to real-time conditions.
3Temperature
If the charging power is drastically reduced when temperature limits are reached, then the temperature of components is controlled, but the charging process is interrupted causing user inconvenience and loss of time
Solution Approach 1:
The patent applies partial action by implementing gradual, incremental reductions in charging power rather than drastic cuts. The control device adjusts power in steps based on temperature conditions, maintaining sufficient cooling while minimizing the impact on charging time and user experience.
Solution Approach 2:
The patent uses dynamic control to continuously adapt charging power to temperature conditions, allowing the system to maintain high power operation as long as thermal limits are not exceeded. Power reduction occurs dynamically and gradually only when necessary, minimizing charging time loss while preventing overheating.
4Adaptability or versatility
If multiple secondary consumers operate simultaneously at the charging station, then the versatility and user service improve, but the thermal load on the air conditioning device increases leading to overload conditions
Solution Approach 1:
The patent implements dynamic coordination of secondary consumers with the air conditioning device operation. The control device monitors the combined thermal load from all secondary consumers and adjusts their operation or reduces charging power when the air conditioning device approaches its capacity limit, preventing overload while maximizing the use of available cooling capacity.
Solution Approach 2:
The patent applies partial action by selectively managing secondary consumer operation based on thermal conditions. When the air conditioning device is near capacity, the control device may reduce or delay operation of non-critical secondary consumers while maintaining essential services, balancing versatility with thermal management.
Data Source
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AI summary
The invention relates to a method for operating a charging station (1), in particular for electric vehicles, wherein - a load state of an air conditioning device (7) of the charging station (1) is determined, and wherein - a charging power of the charging station (1) is influenced depending on the determined load state.