Sodium-Sulfur Battery Depth of Discharge Correction via Weather Data
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Solution Overview
Problem
In small-scale interconnected systems combining renewable energy power generation devices with sodium-sulfur batteries for power compensation, there is a discrepancy between the actual and managed depth of discharge of the sodium-sulfur battery due to slight errors in current control, leading to potential sudden inability to charge or discharge, disrupting output fluctuations compensation.
Innovation Solution
Determine a time within a predetermined period based on weather and seasonal information to correct or reset the depth of discharge of the sodium-sulfur battery, setting output target values to lead the battery to charge or discharge ends, allowing for accurate management and eliminating discrepancies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the depth of discharge is managed by integrating current values in the control device, then the management value can be calculated continuously, but slight errors in current control accumulate over time causing discrepancy between actual and managed depth of discharge
Solution Approach 1:
The patent implements periodic correction of the depth of discharge management value by detecting charge/discharge end states and resetting the management value to match the actual state. This periodic intervention prevents error accumulation while maintaining continuous management capability between corrections.
Solution Approach 2:
The system uses feedback from charge/discharge end detection to correct the management value. When the battery reaches charge or discharge ends, the system detects this state and uses it as feedback to reset the management value, eliminating the discrepancy caused by integration errors.
2Duration of action of stationary object
If the interconnected system operates over a long period, then power compensation capability is maintained, but discrepancy between actual and managed depth of discharge inevitably occurs
Solution Approach 1:
The system performs preliminary detection of charge/discharge end states and proactively corrects the management value before significant discrepancies accumulate. This preliminary action maintains management reliability throughout long-term operation by preventing error buildup.
Solution Approach 2:
The periodic correction mechanism acts as a cushioning measure that prevents the accumulation of management errors during long-term operation. By resetting the management value at charge/discharge ends, the system cushions against the inevitable drift that would otherwise occur over extended periods.
3Measurement precision
If the sodium-sulfur battery reaches charge or discharge ends frequently, then the management value can be corrected often, but the battery availability for power compensation is reduced
Solution Approach 1:
The system uses the battery's own charge/discharge end states as the triggering mechanism for correction. Rather than forcing the battery into artificial charge/discharge cycles solely for correction purposes, the system waits for the battery to naturally reach its operational boundaries, thereby correcting the management value without additional productivity loss.
Data Source
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AI summary
In a method for controlling a sodium-sulfur battery, a time of correcting or resetting a depth of discharge of the sodium-sulfur battery is determined within a predetermined period based on weather information, and the depth of discharge of the sodium-sulfur battery is corrected or reset in the determined time. According to this sodium-sulfur battery control method, the depth of discharge of the sodium-sulfur battery can be accurately managed in a small-scale interconnected system.