Power Converter Fault Logging With Adaptive Sensor Data Retention
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Solution Overview
Problem
Power conversion devices face challenges in storing sufficient information over long periods due to storage capacity limitations, making it difficult to effectively probe into the causes of malfunctions across multiple cell units.
Innovation Solution
A power conversion device comprising cell units, sensors, and controllers that dynamically adjust data sampling and storage based on monitoring conditions, prioritizing storage of critical information during malfunctions to optimize data retention and analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If more information is stored in the storage control device to enable checking of a state of a monitoring target going back to a longer time, then the diagnostic capability is improved, but the storage capacity is exceeded and it becomes difficult to store all the information
Solution Approach 1:
The patent applies local quality by differentiating storage priorities among different types of information. Critical information related to malfunction causes is stored with higher priority and retained longer, while non-critical information is stored with lower priority. This allows the system to optimize storage capacity allocation based on the diagnostic value of different data types, enabling longer retention of essential information without exceeding storage limits.
Solution Approach 2:
The patent implements dynamics by dynamically adjusting the storage period and sampling cycle based on the operational state of the power conversion device. When a malfunction is detected, the system increases the storage period and reduces the sampling cycle to capture more detailed information about the malfunction cause. During normal operation, the system uses a shorter storage period and higher sampling cycle to conserve storage capacity. This dynamic adaptation resolves the contradiction between information retention and storage capacity.
2Reliability
If information is stored over a longer period to investigate malfunctions in a power conversion device composed of a plurality of cell units, then the diagnostic capability is improved, but the storage capacity is exceeded
Solution Approach 1:
The patent applies parameter changes by dynamically modifying the storage period parameter based on the operational state. During normal operation, a first (shorter) storage period is used to conserve space. When a malfunction is detected, the system switches to a second (longer) storage period to retain detailed information necessary for investigating the cause. This parameter adjustment enables reliable malfunction investigation without permanently exceeding storage capacity.
Solution Approach 2:
The system performs preliminary action by continuously monitoring the operational state and detecting malfunctions in advance. When a malfunction is detected, the system proactively extends the storage period and adjusts the sampling cycle to capture relevant diagnostic information. This preliminary detection and response mechanism ensures that critical information is retained before storage capacity is exhausted, improving malfunction investigation capability.
3Device complexity
If a fixed sampling cycle is used for storing information, then the storage control is simplified, but the ability to capture critical malfunction information is reduced
Solution Approach 1:
The patent implements dynamics by making the sampling cycle adjustable based on the operational state. During normal operation, a first (higher) sampling cycle is used to reduce data volume. When a malfunction is detected, the system switches to a second (lower) sampling cycle to capture detailed information about the malfunction cause with higher precision. This dynamic adjustment resolves the contradiction between control simplicity and information capture accuracy.
Data Source
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AI summary
A power conversion device according to an embodiment includes a cell, a first sensor, a second sensor, a storage, a first controller, and a second controller. The first controller is configured to control or protect the cell on the basis of at least one of an output result of the first sensor and an output result of the second sensor. The second controller, in a case in which a change in at least one of the output result of the first sensor and the output result of the second sensor satisfies a first condition, is configured to execute at least one of a first operation of storing the output result of the first sensor in the storage, a second operation of storing the output result of the first sensor in the storage over a second period longer than a first period, and a third operation of storing the output result of the second sensor instead of the output result of the first sensor.