HEMS Battery Charging Control Under High Household Power Demand
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Solution Overview
Problem
Existing electricity storage systems face challenges in effectively storing electricity due to high demand from other devices in a facility, leading to insufficient charging of the storage battery during peak usage periods.
Innovation Solution
An electricity storage system with a management device that restricts the use of electricity in demanding devices when the storage device's capacity is low, allowing it to charge and discharge as needed to manage peak shaving of purchased electricity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the electricity storage device charges in advance using purchased electricity, then the storage capacity is improved, but the electricity demand from other devices in the facility cannot be met
Solution Approach 1:
The system dynamically adjusts the charging strategy of the electricity storage device based on real-time electricity demand conditions. When electricity demand from demanding devices is high, the charging amount is reduced or paused. When demand is low, charging is accelerated. This dynamic adjustment resolves the contradiction between storing electricity and maintaining supply reliability to other devices.
Solution Approach 2:
The management device continuously monitors the electricity demand from demanding devices and uses this feedback information to control the charging/discharging behavior of the storage device. The system receives electricity demand information, compares it with storage needs, and adjusts charging operations accordingly, creating a closed-loop control system that balances storage capacity building with reliable supply to other devices.
2Reliability
If the electricity storage device discharges electricity to meet peak demand, then the electricity supply reliability is improved, but the storage capacity is reduced
Solution Approach 1:
The system performs preliminary charging of the electricity storage device during periods when electricity demand from demanding devices is low. By storing electricity in advance during low-demand periods, the system prepares sufficient capacity to meet future peak demand without compromising supply reliability when it is needed most.
Solution Approach 2:
The system implements periodic charging and discharging cycles based on the operational patterns of demanding devices. During periods when demanding devices are operating at high power consumption, the storage device discharges to maintain supply reliability. During periods of low demand, the storage device charges to replenish capacity, creating a rhythmic pattern that balances reliability maintenance with capacity preservation.
Data Source
AI summary
The power storage system is a system including a power storage device provided in a facility such as a house that is supplied with purchased power from a power system such as a power grid, a power demand device (an air conditioner, a heat pump water heater, a charging/discharging device, an electrified vehicle) that is different from the power storage device, and HEMS controllers that manage the use of power in the power storage device and the power demand device. HEMS controllers comprise a processor, such as a CPU of controls. The processor controls the power storage device to charge the power storage device when the remaining capacity stored in the power storage device is equal to or less than a predetermined value after limiting the use of the purchased power in the demand device.