EV Power Bank Exchange Ratio Control for Grid Demand Balancing
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Solution Overview
Problem
Existing power management systems fail to effectively equalize supply and demand of electric power in the grid due to not considering the state of supply and demand during charging and discharging processes.
Innovation Solution
A power management apparatus that acquires supply and demand data and adjusts the power exchange ratio between a power storage device and a load, determining the amount of electric power received by the load based on the supplied power and the exchange ratio, thereby balancing supply and demand.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power exchange ratio is reduced when there is a shortage of electric power in the power storage device, then the amount of electric power withdrawn from the power storage device is reduced, but the user experience is degraded and users may be discouraged from participating in power supply
Solution Approach 1:
The system dynamically changes the power exchange ratio parameter based on the state of charge of the power storage device. When the charge level is high, a higher exchange ratio is applied to encourage power withdrawal. When the charge level is low, the exchange ratio is reduced to conserve power. This dynamic parameter adjustment resolves the contradiction by adapting the system behavior to current conditions rather than applying a fixed restrictive policy.
Solution Approach 2:
The system implements a feedback mechanism where the controller continuously monitors the charge level of the power storage device and adjusts the power exchange ratio accordingly. This closed-loop control ensures that power management decisions are based on real-time system state, allowing the system to maintain reliability while responding flexibly to user needs and preventing demotivation from excessive restrictions.
2Productivity
If the power exchange ratio is set high to encourage power withdrawal from the power storage device, then user participation is improved, but the power storage device may become depleted during periods of high demand
Solution Approach 1:
The power exchange ratio is made dynamic rather than static, changing in real-time based on the charge level of the power storage device. This allows the system to optimize power withdrawal efficiency when sufficient power is available while automatically reducing withdrawal rates when the storage device becomes depleted, thus maintaining both productivity and reliability through adaptive behavior.
Solution Approach 2:
The system changes the power exchange ratio parameter according to the charge level conditions. When charge level is high, the exchange ratio is set high to maximize power withdrawal efficiency. When charge level drops below thresholds, the exchange ratio is reduced to preserve power supply reliability. This parameter adaptation resolves the contradiction between encouraging withdrawal and preventing depletion.
3Reliability
If the controller uniformly reduces the power exchange ratio regardless of the amount of power supplied by the user, then power storage is protected during shortages, but users with high power contributions are excessively restricted
Solution Approach 1:
The system applies different power exchange ratios to different users based on their individual power supply amounts, rather than applying a uniform reduction to all users. Users who supply larger amounts of power receive more favorable exchange ratios, while still maintaining overall power storage stability. This localized differentiation resolves the contradiction by tailoring restrictions to individual contribution levels.
Solution Approach 2:
The power exchange ratio parameter is adjusted based on both the overall charge level and the individual user's power supply amount. This dual-condition parameter adjustment allows the system to protect power storage stability while preventing excessive restriction of high-contributing users, as their larger contributions justify more favorable exchange terms even during periods of limited storage capacity.
Data Source
AI summary
A power management apparatus includes a communication unit (acquisition unit) that acquires information about supply and demand of electric power for a power bank (power storage device), and a processor (controller) that controls electric power received by an electric vehicle from the power bank. The processor sets a power exchange ratio of electric power received from the power bank to electric power supplied to the power bank, depending on the supply and demand of electric power. The processor determines an amount of electric power to be received by the electric vehicle from the power bank, based on an amount of electric power supplied from the electric vehicle to the power bank, and the power exchange ratio.