Storage Battery Sensor Abnormality Detection via Cross-Comparison
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Solution Overview
Problem
Conventional storage battery systems face difficulties in accurately and promptly detecting abnormalities in sensors, which affects the control accuracy of charge/discharge operations, as the Energy Management System (EMS) is overwhelmed with arithmetic calculations and struggles to continuously monitor sensor outputs.
Innovation Solution
A storage battery system with a control device that includes an abnormality detection unit, which compares output values from similar type sensors in the Power Conditioning System (PCS) and Battery Management Unit (BMU) to detect abnormalities, and includes a malfunction indication lamp and interlock processing unit to notify operators and prevent further issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Energy Management System (EMS) monitors sensor outputs to detect abnormalities, then detection capability is provided, but the EMS becomes overwhelmed with arithmetic calculations and cannot continuously monitor sensor outputs
Solution Approach 1:
The patent divides the monitoring function into two segments: the control device performs continuous monitoring of sensor outputs and detects abnormalities, while the EMS focuses on higher-level energy management decisions. This segmentation relieves the EMS of continuous monitoring calculations while maintaining reliable abnormality detection through the dedicated control device.
2Measurement precision
If sensor measurement accuracy is abnormal, then control accuracy of charge/discharge electric power amount is affected, but continuous monitoring of sensor accuracy is difficult due to EMS calculation burden
Solution Approach 1:
The control device performs self-monitoring of sensor measurements by continuously comparing current sensor outputs with reference values and detecting deviations. This self-service monitoring ensures continuous measurement precision verification without burdening the EMS, as the control device independently maintains sensor accuracy checks.
3Reliability
If the EMS continuously monitors all sensor outputs for abnormality detection, then detection accuracy is improved, but the system response time increases due to calculation overhead
Solution Approach 1:
The control device performs preliminary monitoring and abnormality detection of sensor outputs before issues reach the EMS. By detecting sensor abnormalities early through continuous comparison with reference values, the system prevents problematic data from reaching the EMS, enabling faster response times while maintaining detection accuracy.
Data Source
AI summary
A storage battery system connected to a power system includes: a storage battery; a BMU which monitors a state of the storage battery with a first sensor; a PCS which charges the storage battery and discharges from the storage battery with reference to an output value of a second sensor similar in type to the first sensor; and a control device. The control device receives a charge/discharge request and storage battery information supplied from the BMU and controls the PCS based on the charge/discharge request and the storage battery information. An abnormality detection unit of the control device acquires the output value of the second sensor from the PCS, and detects abnormality of any sensor as a result of comparison between the output value of the second sensor and an output value of the first sensor included in the storage battery information.