Sodium-Sulfur Battery Depth Management via Sequential Control
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Solution Overview
Problem
In interconnected systems combining renewable energy power generation devices with sodium-sulfur battery-based electric power storage-compensation devices, accurate management of battery depth is challenging due to minute discharge or charge currents leading to errors and potential sudden termination of battery operation during output fluctuations.
Innovation Solution
Implement a method where sodium-sulfur batteries are sequentially stopped and restarted based on predetermined priority order when their power decreases to a certain level, ensuring accurate battery depth management and preventing errors by maintaining sufficient current for recognition and integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If collective control of charge and discharge is performed for all sodium-sulfur batteries, then control simplicity is improved, but measurement precision of battery depth deteriorates due to minute currents entering dead zones
Solution Approach 1:
The patent divides the collective control of all batteries into individual battery control units. Each sodium-sulfur battery is controlled separately with its own control unit that independently manages charge/discharge operations. This segmentation allows precise measurement of each battery's current and voltage parameters, preventing minute currents from being lost in collective measurements, thereby resolving the contradiction between control simplicity and measurement precision.
2Productivity
If batteries operate continuously with minute discharge or charge power, then productivity is improved, but reliability deteriorates due to unrecognized discharge/charge states
Solution Approach 1:
The patent implements a feedback mechanism where each battery's control unit continuously monitors its charge/discharge state by measuring current and voltage. When a battery reaches full charge or complete discharge, the control unit detects this state and sends feedback signals to stop further charging or discharging. This prevents unrecognized states and ensures reliable operation, resolving the contradiction between continuous productivity and operational reliability.
3Measurement precision
If individual battery control is implemented, then measurement precision of battery depth is improved, but device complexity increases
Solution Approach 1:
The patent enables each sodium-sulfur battery to be a self-service unit with its own integrated control unit that autonomously manages its charge/discharge operations. Each control unit independently calculates battery depth, monitors state of charge, and makes control decisions without requiring complex centralized management. This self-service approach improves measurement precision while minimizing overall system complexity, as each unit handles its own control needs.
Data Source
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AI summary
When charge power or discharge power of each individual sodium-sulfur battery included in a plurality of sodium-sulfur batteries becomes 1/n (n is a natural number) or less of a rated output, individual sodium-sulfur batteries are sequentially stopped. This prevents the discharge power (or the charge power) of the sodium-sulfur battery from becoming minute, so that a battery depth (or a stored energy) of the sodium-sulfur battery can be accurately managed.