DC Bus EV Charging Station With Battery Peak-Demand Buffering
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Solution Overview
Problem
Charging stations for electric vehicles face challenges such as high power consumption and demand spikes, which can strain external energy sources like the electrical grid, and may result in increased charge times or inability to provide power during outages or intermittent renewable energy sources.
Innovation Solution
A charging station design that includes a direct current (DC) bus, a battery for energy storage, and DC/DC converters to manage power flow between the battery and electric vehicles, allowing for efficient energy storage and distribution, reducing peak demand on external energy sources, and ensuring continuous charging capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the charging station draws high power from external energy sources to charge multiple electric vehicles simultaneously, then the charging speed and productivity are improved, but the strain on the external energy source increases and demand spikes occur
Solution Approach 1:
The charging station performs preliminary action by charging the onboard battery from external energy sources during periods of low demand, so that stored energy is available for later use during peak charging periods. This allows the station to provide high power output without always drawing high power from the external grid, thus improving charging speed while reducing strain on external energy sources.
Solution Approach 2:
The onboard battery acts as an intermediary energy storage device between the external energy sources and the electric vehicles being charged. It buffers the power flow, absorbing energy when external sources are stable and releasing energy when high power output is needed, thereby decoupling the charging station's output capability from the instantaneous demand on external energy sources.
2Reliability
If the charging station reduces output power to avoid straining external energy sources, then the stability of external energy source is maintained, but the charge time increases
Solution Approach 1:
The system performs preliminary charging of the onboard battery during off-peak periods when external energy sources are stable and demand is low. This stored energy is then available for rapid discharge during peak periods, allowing the station to maintain high charging speeds without continuously straining external energy sources, thus avoiding extended charge times.
Solution Approach 2:
The onboard battery serves as an intermediary that enables the charging station to deliver high power output independently of external energy source constraints. By drawing from stored battery energy rather than always relying on external sources, the station can maintain high charging speeds while reducing overall strain on external energy infrastructure.
3Adaptability or versatility
If the charging station relies on intermittent renewable energy sources, then the sustainability is improved, but the reliability of power supply decreases during outages
Solution Approach 1:
The charging station performs preliminary energy accumulation by charging the onboard battery during periods when renewable energy sources are generating power. This stored energy ensures that the station can continue operating during periods when renewable sources are unavailable, thus maintaining power supply continuity while preserving the sustainability benefit of using renewable energy.
Solution Approach 2:
The onboard battery acts as an intermediary buffer between intermittent renewable energy sources and the charging load. It absorbs energy variability from renewable sources, storing energy when generation exceeds demand and releasing energy when generation is insufficient, thereby decoupling the sustainability advantage of renewable energy from the reliability disadvantage of intermittency.
4Reliability
If the charging station uses a battery for energy storage and DC/DC converters for power management, then the ability to manage peak demand is improved, but the device complexity increases
Solution Approach 1:
The onboard battery and DC/DC converters serve as intermediary power management components between external energy sources and electric vehicles. They provide intelligent power flow control, enabling the station to manage peak demand by drawing from battery storage during high-demand periods while reducing overall system complexity compared to directly connecting multiple high-power chargers to the grid.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution reduces the strain on external energy sources by managing peak demand, decreases charge times by allowing for higher output power, and ensures reliable charging even during power outages or intermittent renewable energy supply.
Implementation Method 1
a battery coupled to the DC bus, the battery being arranged to charge via power received from the one or more external energy sources via the DC bus
Implementation Method 2
one or more DC/DC converters coupled to the DC bus, the one or more DC/DC converters being arranged to: draw DC power from the battery, via the DC bus; and output DC power to one or more electric vehicles via one or more charging connections
Data Source
AI summary
A charging station for charging electric vehicles. The charging station comprises a direct current, DC, bus arranged to receive power from one or more external energy sources. The charging station also comprises a battery coupled to the DC bus, the battery being arranged to charge via power received from the one or more external energy sources via the DC bus. The charging station also comprises one or more DC/DC converters coupled to the DC bus. The one or more DC/DC converters are arranged to draw DC power from the battery, via the DC bus, and output DC power to one or more electric vehicles via one or more charging connections, to charge the one or more electric vehicles.