Residential Power Storage Controller Discharge Limiting
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Solution Overview
Problem
Residential electric power storage devices have a short lifetime due to high discharging currents, making them costly to replace and reducing the economic advantage of storing low-nighttime power rates, as they are not optimized for individual household energy consumption patterns.
Innovation Solution
A residential electric power storage system with a controller that determines a suitable discharge limit value based on accumulated energy consumption data, creating patterns to manage the state of charge and restrict discharging, thereby extending the device's lifetime.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the discharging current is increased to meet daytime power demand, then the power supply capability is improved, but the lifetime of the electric power storage device is shortened
Solution Approach 1:
The system dynamically adjusts the discharging current based on the state of charge and time of day. The controller modifies the discharge rate in real-time, using higher currents when SOC is high and lower currents when SOC is low, thereby adapting the power output to both demand and battery state without permanently damaging the battery
Solution Approach 2:
The invention changes the operational parameters of the battery by controlling the discharging current within specific ranges based on state of charge. By adjusting the current parameter dynamically rather than using a fixed high discharge rate, the system maintains power supply capability while protecting battery lifetime
2Loss of energy
If the electric power storage device is used to store nighttime power for daytime use, then the electricity bill is reduced, but the device lifetime is shortened due to high discharging current
Solution Approach 1:
The controller continuously monitors the state of charge and uses this feedback to adjust the discharging current. By implementing closed-loop control, the system ensures that high discharge rates are only used when sufficient charge is available, automatically reducing current as SOC decreases, thus protecting the battery while maintaining economic benefits
Solution Approach 2:
The system uses its own state of charge information to self-regulate the discharging current without external intervention. The controller automatically adjusts operational parameters based on internal SOC measurements, enabling the battery to serve itself in optimizing both economic return and lifetime
Data Source
AI summary
A controller includes a data accumulation unit that obtains data of an amount of electric power consumed in a residence and accumulates the obtained data a representative pattern creation unit that creates a representative pattern based on the data accumulated in the data accumulation unit, the pattern representatively indicating how the electric power storage device varies in state of charge for its discharging period and a limit value determination unit that determines a limit value to correspond to the pattern.