Power Storage System Grid Failure Control
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Solution Overview
Problem
Power storage systems face challenges in stabilizing operations during grid power failures and extending battery lifespan, as existing systems often fail to efficiently manage power distribution and charging conditions.
Innovation Solution
A power storage system and method that include a central controller determining the duration of a grid power failure and the battery's state of charge to select between two power failure returning modes: stopping power supply for a period or charging the battery, ensuring the system returns to a pre-failure state while minimizing frequent charging and discharging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the system charges the battery immediately after power failure, then the battery state of charge is improved, but the battery lifespan deteriorates due to frequent charging cycles
Solution Approach 1:
The controller performs preliminary assessment of power failure duration and battery state of charge before initiating charging operations. By evaluating whether the power failure exceeded a predetermined threshold and whether the battery charge state is below a reference level, the system avoids unnecessary charging cycles that would shorten battery lifespan while ensuring charging occurs when genuinely needed.
2Duration of action of stationary object
If the system stops power supply for a predetermined period after power failure, then the battery lifespan is extended by reducing charging frequency, but the power supply stability deteriorates
Solution Approach 1:
The controller implements a feedback mechanism that continuously monitors battery charge state and power failure characteristics. Based on this feedback, the system intelligently decides whether to charge the battery immediately or delay charging for a predetermined period. This feedback-based decision-making ensures power supply stability by charging only when necessary while extending battery lifespan by avoiding unnecessary charging cycles.
3Reliability
If the system charges the battery using grid power after power failure, then the power supply reliability is improved, but the energy efficiency deteriorates due to potential unnecessary charging
Solution Approach 1:
The controller performs preliminary evaluation of the power failure situation and battery state before initiating charging operations. By assessing whether the power failure duration exceeded a threshold and whether the battery charge state is below a reference level, the system avoids unnecessary charging that would waste energy while ensuring reliable power supply when genuinely needed.
Data Source
AI summary
A method of controlling a power storage system for supplying power to a load from a power generation system, a battery, and a grid includes: when power failure occurs in the grid, determining whether duration of the power failure is more than a standard duration; if the duration of the power failure is more than the standard duration, determining a state of charge of the battery; and when the power failure of the grid has ended, if the duration of the power failure is less than the standard duration or if the state of charge of the battery is equal or more than a standard value, performing a first power failure returning mode; and if the charging condition of the battery is less than the standard value, performing a second power failure returning mode. Accordingly, the power storage system performs a stable operation and prevents lifespan shortening of the battery.