EV Charging Permission Control for Power Network Reserve Limits
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Solution Overview
Problem
Microgrids connected to electric vehicle supply equipment face instability due to high demand for vehicle charging, which existing methods fail to address effectively without compromising user convenience or causing power network instability.
Innovation Solution
A server manages power adjustment resources by determining if the power network reserve is sufficient before allowing vehicle charging, using power adjustment resources to respond to charging demands, and implementing different permission levels for charging to balance supply and demand while maintaining user convenience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If vehicle charging is restricted to maintain power network stability, then power network stability is improved, but user convenience is worsened
Solution Approach 1:
The server performs preliminary determination of power network reserve before allowing vehicle charging to start. The first determination unit checks if reserve meets the first reference value in advance, and the second determination unit checks if power adjustment resources can respond in advance. This preliminary assessment ensures charging only begins when the network can handle the load, maintaining stability while enabling user convenience.
Solution Approach 2:
The server acts as an intermediary between the power network and vehicle charging systems. It manages the interaction by determining whether charging requests should be permitted based on real-time power network conditions and power adjustment resource availability, thus mediating between network stability requirements and user charging needs.
2Ease of operation
If vehicle charging is permitted without restriction, then user convenience is improved, but power network stability is worsened
Solution Approach 1:
The server continuously monitors power network reserve and power adjustment resource status, using this feedback to dynamically determine whether to permit or restrict vehicle charging. This feedback mechanism ensures charging permissions are granted only when network conditions are favorable, preventing instability while maintaining user convenience.
3Reliability
If power adjustment resources are activated to respond to charging demand, then power network stability is improved, but system complexity is worsened
Solution Approach 1:
Power adjustment resources are designed to serve multiple functions: they can respond to vehicle charging demands, provide frequency regulation, and offer voltage support. By making these resources multi-functional, the system achieves improved stability without proportionally increasing complexity, as the same resources address multiple power network needs.
Data Source
AI summary
Before start of vehicle charging by using a power network, a first determination unit determines whether reserve of the power network is not less than a first reference value. When reserve of the power network is not less than the first reference value, a first permission unit permits supply of electric power from the power network to a vehicle. When reserve of the power network is smaller than the first reference value, a second determination unit determines whether or not electric power corresponding to charging power can be supplied to the power network by having at least one of power adjustment resources respond to vehicle charging. When the second determination unit determines that electric power can be supplied, a second permission unit permits supply of electric power from the power network to the vehicle.