EV Charging Control System Synchronizes Grid Feed-In with Vehicle Consumption
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Solution Overview
Problem
The increasing number of electric vehicles and photovoltaic systems generating excess energy during the day creates current peaks in the grid, which are not efficiently utilized for self-consumption, especially when the vehicle is not at home, due to high investment costs of storage solutions and mismatched energy availability.
Innovation Solution
A control system that synchronizes the charging of electric vehicles with the energy fed into the grid by integrating a mobile measurement system into a communication network, allowing the vehicle to consume only the available self-generated energy, enabling remote extension of self-consumption through a power charging station located near the vehicle, such as at work or public facilities, with authentication mechanisms to prevent unauthorized charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If photovoltaic systems generate excess energy during the day and feed it into the grid, then self-consumption is reduced, but current peaks are created in the grid
Solution Approach 1:
The system performs preliminary action by charging the electric vehicle during daytime hours when PV energy is being generated and fed into the grid. The control system monitors grid energy availability in real-time and initiates charging operations before the vehicle would normally be charged at home in the evening, thereby capturing excess PV energy that would otherwise create grid current peaks.
Solution Approach 2:
The power charging station acts as an intermediary between the grid and the electric vehicle. It receives excess PV energy from the grid during daytime and transfers it to the vehicle's battery, serving as a mediation point that enables energy transfer without requiring direct connection between the PV system and the vehicle. This intermediary function allows flexible energy capture while maintaining system independence.
2Use of energy by moving object
If storage in accumulators is implemented to store excess PV energy, then self-consumption is improved, but investment costs increase
Solution Approach 1:
The system uses self-service by leveraging the electric vehicle's existing battery as a storage medium instead of installing separate accumulator systems. The vehicle's battery naturally serves the dual purpose of propelling the vehicle and storing excess PV energy, eliminating the need for additional investment in dedicated storage infrastructure while still achieving energy self-consumption goals.
Solution Approach 2:
The electric vehicle's battery is utilized for multiple functions: it serves as both the propulsion energy source and the storage medium for excess PV energy. This multi-functionality eliminates the need for separate storage systems, reducing investment costs while maintaining the capability to store and utilize renewable energy independently.
3Use of energy by moving object
If the electric car is charged at home during evening hours, then self-consumption is maximized, but energy availability from PV systems is missed
Solution Approach 1:
The system applies dynamics by making the charging schedule flexible and adaptive rather than fixed. The control system continuously monitors PV energy generation patterns and grid energy availability, dynamically adjusting charging operations to match real-time energy supply conditions. This allows the system to capture energy during daytime when PV systems are active rather than adhering to traditional evening charging routines.
Solution Approach 2:
The control system implements feedback by continuously monitoring grid energy availability and PV generation patterns, then using this information to adjust charging operations. The system receives real-time data about energy supply conditions and responds by optimizing charging timing and rate, ensuring that charging operations are synchronized with actual energy availability rather than following predetermined schedules.
4Adaptability or versatility
If a power charging station is located away from the house, then self-consumption extension is enabled, but authentication and security mechanisms are required
Solution Approach 1:
The control system acts as an intermediary that manages the authentication and security functions between the power charging station and the grid operator. Rather than requiring complex local authentication hardware at each charging station, the control system mediates the verification process, using communication networks to authenticate vehicles and authorize charging operations remotely.
Solution Approach 2:
The system replaces mechanical authentication mechanisms with electronic communication-based verification. Instead of using physical keys, cards, or biometric scanners at the charging station, the system uses digital communication networks to authenticate vehicles and authorize charging, substituting electronic verification for traditional mechanical security systems.
Data Source
AI summary
A method for electricity purchase of an electric car (22) at a power charging procedure at a power charging station (30), which is connected to the grid (15), a PV system (10) or other domestic system for generating electricity is feeding current at a first measurement system (16) into the grid (15), and the electric car (22) charges current at a second measurement system (26) from a power charging station (30) where both measurement systems (16, 26) are integrated in a communication network (20) and are, at least indirectly, in communication connection (K1, K2) with each other to control the charging current, preferable to synchronize it with the fed in current.