ESS Power Switching for Multi-Charger EV Fast Charging
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge lies in effectively managing power distribution for high-speed electric vehicle charging systems, particularly in determining when to switch between charge and discharge modes of an energy storage system (ESS) to optimize charging efficiency and prevent power shortages, while ensuring the longevity of the ESS and maintaining continuous high-speed charging services.
Innovation Solution
A power management method that monitors the state of charge (SOC) and state of health (SOH) of the ESS, switching to discharge mode when the SOC exceeds a set value to supply power to multiple high-speed chargers and to charge mode when it falls below, ensuring power is not supplied to chargers when needed for ESS preservation, and using artificial neural networks to optimize charger placement based on usage patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If power is supplied from ESS to high-speed chargers to enable fast charging, then charging speed is improved, but ESS lifespan deteriorates due to excessive discharge cycles
Solution Approach 1:
The system performs preliminary assessment of ESS state of charge and state of health before enabling high-speed charging. By checking SOC and SOH in advance, the system determines whether the ESS can safely support high-speed charging without compromising its lifespan, thus preventing excessive discharge cycles before they occur.
Solution Approach 2:
The system dynamically adjusts the charging mode by switching between high-speed charging and normal charging based on real-time monitoring of ESS SOC and SOH. When ESS health deteriorates or charge level drops below thresholds, the system automatically transitions from high-speed to normal charging mode, optimizing the balance between charging speed and ESS lifespan.
2Productivity
If high-speed chargers operate continuously to meet charging demand, then productivity is improved, but power management reliability deteriorates due to ESS depletion
Solution Approach 1:
The system implements continuous feedback monitoring of ESS charge level, switching between charge and discharge modes based on real-time SOC readings. When ESS charge level drops below a threshold, the system automatically switches to charge mode from discharge mode, ensuring the ESS is recharged before depletion occurs, thus maintaining power management reliability.
Solution Approach 2:
The system performs preliminary checks of ESS charge level before committing to high-speed charging operations. By assessing whether the ESS has sufficient charge to support the requested charging session, the system prevents scenarios where continuous high-speed charging would deplete the ESS, thereby maintaining reliability.
3Adaptability or versatility
If multiple high-speed chargers are operated simultaneously to serve multiple vehicles, then adaptability is improved, but power distribution complexity increases
Solution Approach 1:
The system segments the power management task by independently evaluating each high-speed charger's power request against the ESS's available capacity. Instead of managing all chargers as a single complex system, the controller divides the decision-making process into individual charger assessments, simplifying the overall control logic while maintaining multi-vehicle charging capability.
Solution Approach 2:
The system allows partial operation of high-speed chargers based on available ESS capacity. When multiple vehicles request high-speed charging but the ESS cannot fully support all requests, the system grants power to some chargers while denying others, rather than requiring complex load-sharing protocols. This partial action approach simplifies control while maintaining adaptability.
Data Source
AI summary
The present embodiment provides a method and device for managing the power of an electric vehicle charging station by using an ESS. More specifically, provided are a method and device for controlling to set the ESS to a discharge mode and supply power to a plurality of high-speed chargers connected to the ESS, thereby enabling high-speed charging through the plurality of high-speed chargers, when it is determined that the charging amount of the ESS is greater than a first set value, and controlling to set the ESS to a charge mode and not supply power to the plurality of high-speed chargers, thereby stopping the operation of the plurality of high-speed chargers, when it is determined that the charging amount of the ESS is smaller than the first set value.