Server Device for Bidirectional Vehicle-to-Grid Power Exchange
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Solution Overview
Problem
Existing vehicle charging systems and load leveling systems are not capable of bidirectional power exchange, limiting their contribution to stabilizing commercial power systems and increasing the number of vehicles participating in V2G systems, which hinders the agreement probability of power trading between suppliers and consumers.
Innovation Solution
A server device manages the charge/discharge of electricity storage units in vehicles, utilizing a power conversion unit, analysis unit for demand/supply prediction, decision unit for optimal charge/discharge timing, and transmission unit to instruct vehicles for efficient power exchange with the grid, enhancing the stability of the power system and profit ratios for all involved parties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If existing vehicle charging systems are used, then charging can be performed, but bidirectional power exchange is not possible and contribution to stabilizing commercial power systems is limited
Solution Approach 1:
The patent implements bidirectional power exchange by inverting the traditional unidirectional charging approach. The power conversion unit can operate in both charging modes (power supply to vehicle) and discharging modes (power from vehicle to grid), allowing the vehicle battery to function as both a consumer and supplier of electrical energy, thereby enabling V2G (Vehicle-to-Grid) functionality that contributes to power system stabilization
Solution Approach 2:
The power conversion unit is designed with multi-functionality to handle both charging and discharging operations. The control unit manages multiple operational modes including charging, discharging, and standby states, allowing the same hardware infrastructure to serve dual purposes of vehicle power supply and grid power stabilization, increasing system versatility without requiring separate dedicated systems
2Reliability
If the number of vehicles participating in V2G is increased, then power system stability improves, but agreement probability of power trading between suppliers and consumers decreases
Solution Approach 1:
The control unit implements feedback mechanisms by continuously monitoring power supply/demand conditions, vehicle battery states of charge, and trading parameters. Based on this feedback, the system dynamically adjusts charge/discharge timing and power conversion unit operation to optimize both power system stability contribution and trading agreement probability, allowing adaptive response to changing market and grid conditions
Solution Approach 2:
The system employs dynamic operational modes that can switch between charging, discharging, and standby states based on real-time power supply/demand conditions and trading opportunities. This dynamic adaptability allows the vehicle battery system to respond flexibly to varying grid requirements and market conditions, optimizing participation in V2G while maintaining high agreement probability for power trading
3Reliability
If charge/discharge timing is optimized based on demand/supply predictions, then power system stability increases, but system complexity increases
Solution Approach 1:
The control unit performs preliminary actions by predicting future power supply and demand conditions in advance. Based on these predictions, the system proactively plans and schedules optimal charge/discharge timing for the vehicle battery, allowing it to contribute to power system stability through anticipated grid needs rather than reactive responses, thereby managing complexity through forward planning
Solution Approach 2:
The control unit autonomously manages the charge/discharge operations based on predicted power conditions and predefined trading parameters. The system self-regulates the power conversion unit's operation modes and timing without requiring constant external control input, reducing operational complexity while maintaining optimized power system stability contribution through intelligent autonomous decision-making
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 server device improves power system stability by optimizing charge/discharge times based on demand/supply predictions, increasing the agreement probability of power trading, and promoting active participation of vehicles in V2G systems, thereby maximizing profits for all stakeholders involved.
Implementation Method 1
a power conversion unit for performing conversion of power exchanged between the electricity storage unit and an external power system
Data Source
AI summary
A charging/discharging device includes an electricity storage unit provided in transport equipment, a power conversion unit for performing conversion of power exchanged between the electricity storage unit and an external power system, and a control unit for controlling an operation of the power conversion unit in accordance with a reception signal. A server device that manages charge/discharge of the electricity storage unit performs demand/supply prediction of power in the power system, decides a time, at which discharge of the electricity storage unit to the power system or charge of the electricity storage unit by power supplied from the power system is performed, and transmits an instruction including the decided time, at which the discharge or the charge is performed, to the charging/discharging device.