Bidirectional V2G Charging Device with Server-Controlled Power Conversion
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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 fail to increase the number of vehicles participating in Vehicle-to-Grid (V2G) systems for power trading and stabilization.
Innovation Solution
A charging/discharging device with an electricity storage unit, power conversion unit, and control unit that receives instructions from a server for optimal charge/discharge times based on power demand and supply predictions, ensuring efficient power exchange with the grid and minimizing the control unit's operational time to enhance durability and reduce consumption.
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 with the grid is not possible, limiting contribution to power system stabilization
Solution Approach 1:
The patent applies inversion by enabling bidirectional power flow, allowing the vehicle battery to not only charge from the grid but also discharge to the grid. The power conversion unit is configured to handle both charging and discharging modes, transforming the unidirectional charging system into a bidirectional V2G system that can stabilize the power system by supplying power during peak demand periods.
2Use of energy by stationary object
If load leveling systems charge vehicles at business places, then power exchange occurs, but the control unit operates continuously increasing power consumption and reducing durability
Solution Approach 1:
The patent implements periodic action by controlling the power conversion unit to operate only during scheduled charging and discharging periods. The control unit receives instructions from the server device specifying time periods for power exchange, and remains in a low-power state outside these periods. This periodic operation reduces overall power consumption and extends the operational lifespan of the control unit compared to continuous operation.
Solution Approach 2:
The system applies self-service by having the vehicle automatically connect to the power supply facility during scheduled discharging periods without requiring continuous control unit operation. The power conversion unit autonomously manages the discharging process based on pre-arranged schedules, reducing the need for continuous monitoring and control.
3Productivity
If vehicles participate in V2G systems without optimized scheduling, then power trading can occur, but agreement probability with power suppliers remains low
Solution Approach 1:
The patent applies preliminary action by having the server device determine optimal charging and discharging time periods in advance based on power demand predictions and vehicle usage patterns. These pre-scheduled time periods are communicated to the vehicle before actual power exchange occurs, allowing the system to proactively coordinate with power suppliers and increase agreement probability for power trading.
Solution Approach 2:
The system implements feedback by continuously monitoring power demand and supply conditions, vehicle battery status, and usage patterns. The server device uses this feedback information to optimize charging and discharging schedules, adjusting time periods to maximize power trading agreement probability while ensuring vehicle availability when needed.
4Reliability
If electricity storage units are frequently charged and discharged, then power system stabilization improves, but deterioration of the electricity storage unit accelerates
Solution Approach 1:
The patent applies partial action by optimizing the balance between charging and discharging operations to achieve sufficient power system stabilization without excessive cycles. The server device determines time periods that provide adequate contribution to grid stability while avoiding overly frequent or prolonged discharging that would accelerate battery deterioration. This selective, optimized operation achieves the necessary stabilization effect with minimal wear.
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 improves power system stability by optimizing charge/discharge times according to power demand and supply predictions, increasing the agreement probability of power trading, and delaying the deterioration of the electricity storage unit, thus promoting active participation in V2G systems and maximizing profits for all involved parties.
Implementation Method 1
a power conversion unit that performs 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 to a transport equipment, a power conversion unit that performs conversion of power exchanged between the electricity storage unit and an external power system, a reception unit that receives an instruction transmitted from a server device that 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, the instruction including the time at which the discharge or the charge is performed, and a control unit that starts up or stops based on the time indicated by the instruction received in the reception unit and controls an operation of the power conversion unit.