Storage Battery Evaluation Device Using Dead Zone Control
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Solution Overview
Problem
Current energy storage systems for power quality improvement cannot be stopped for deterioration evaluation, making precise deterioration assessment unrealistic, as they must continuously operate to stabilize electric power and suppress frequency fluctuations.
Innovation Solution
A storage battery evaluation device with a charging/discharging controller that sets a 'dead zone' for zero charging/discharging when the power command value is below a threshold, allowing for evaluation of the battery's deterioration state by measuring the voltage response characteristic when charging/discharging is suddenly stopped.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the energy storage system is stopped for deterioration evaluation, then precise deterioration assessment can be performed, but the system cannot maintain continuous operation for power quality improvement
Solution Approach 1:
The system performs preliminary actions by accumulating charging/discharging history data during normal operation, and prepares evaluation conditions (dead zone entry/exit) that will naturally occur during operation. This allows the system to conduct deterioration evaluation based on pre-captured data without stopping the energy storage system.
Solution Approach 2:
The invention maintains continuous operation of the energy storage system by evaluating deterioration during normal charging/discharging cycles. The system continuously monitors voltage response characteristics during dead zone transitions, enabling uninterrupted power quality improvement functions while performing ongoing deterioration assessment.
2Reliability
If the energy storage system operates continuously for power quality improvement, then electric power stabilization and frequency fluctuation suppression are maintained, but deterioration evaluation cannot be performed
Solution Approach 1:
The system uses feedback by monitoring voltage response characteristics during dead zone transitions and comparing them against reference values. This feedback mechanism enables continuous deterioration evaluation during normal operation, maintaining both power quality stabilization and assessment capability simultaneously.
Solution Approach 2:
The energy storage system performs self-diagnosis by evaluating its own deterioration state through voltage response measurements during normal operation. The system uses its own operational data (charging/discharging history, voltage responses) to assess its condition without requiring external testing or shutdown, maintaining reliability while enabling self-monitoring.
3Measurement precision
If charging/discharging test is performed by stopping the system, then precise deterioration evaluation can be conducted, but the system cannot maintain operational status
Solution Approach 1:
The invention replaces physical stopping of the system with an electrical measurement approach. Instead of mechanically stopping charging/discharging to perform tests, the system uses electrical voltage response measurements during natural dead zone transitions to assess deterioration, maintaining system availability while achieving evaluation accuracy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables continuous operation of energy storage systems for power quality improvement while allowing for precise battery state evaluation, reducing current cumulative errors and enabling real-time deterioration assessment without stopping the system.
Implementation Method 1
an energy storage device 113, and a state evaluator 114. The energy storage system 101 has a charging/discharging function
Implementation Method 2
The state evaluator 114 measures a response characteristic of a voltage of the energy storage device 113
Data Source
AI summary
According to one embodiment, a storage battery evaluation device includes a charging/discharging controller and a deterioration evaluator. The charging/discharging controller acquires a charging/discharging power command value, performs control to charge and discharge an energy storage device according to the charging/discharging power command value, sets a dead zone in which the charging and discharging is not performed when an absolute value of the charging/discharging power command value is equal to or smaller than a threshold, and performs control to stop the charging and discharging when the charging/discharging command value enters the dead zone. The deterioration evaluator measures a response characteristic of a voltage of the energy storage device at a time when the charging and discharging is stopped from a state in which the energy storage device is charged and discharged and evaluates a deterioration state of the energy storage device on a basis of the response characteristic.