Power Semiconductor State Estimation Using Voltage-Current Distributions
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Solution Overview
Problem
Existing methods fail to accurately detect the progression of deterioration in power conversion semiconductor apparatuses during online operation, leading to potential failure of power conversion systems.
Innovation Solution
A state estimation system and method that projects voltage and current detection values onto a coordinate plane to analyze the distribution of points, enabling estimation of the semiconductor apparatus' state and detecting deterioration through changes in saturation voltage and conduction characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If offline detection method is used to detect power conversion semiconductor apparatus state, then detection can be performed with simple equipment, but detection cannot be performed during online operation and deterioration progression cannot be detected in real-time
Solution Approach 1:
The existing voltage and current detection systems serve dual purposes: their original function for power conversion control and an additional function for deterioration detection. By reusing these existing sensors and data, the system achieves online deterioration detection without adding dedicated detection equipment, thus maintaining simplicity while improving reliability
Solution Approach 2:
The analysis processing unit acts as an intermediary that transforms existing voltage and current detection data into deterioration state information. This mediator processes the raw detection values by projecting them onto coordinate planes and analyzing distribution patterns, enabling online deterioration detection without direct physical intervention in the power conversion system
2Loss of time
If online monitoring is implemented to detect deterioration during power conversion, then real-time detection is achieved, but system complexity and data processing requirements increase
Solution Approach 1:
Instead of analyzing all possible electrical parameters, the system focuses on specific voltage and current detection values that are most indicative of deterioration. By selectively processing only the necessary data points and projecting them onto relevant coordinate planes, the system achieves timely deterioration detection while keeping processing complexity manageable
Solution Approach 2:
The system transforms one-dimensional time-series voltage and current data into two-dimensional coordinate plane representations. By projecting detection values onto coordinate planes with voltage and current axes, the system creates distribution patterns that reveal deterioration states, enabling time-efficient analysis through dimensional transformation
Data Source
AI summary
A state estimation system for a power conversion semiconductor apparatus in an embodiment includes an analysis processing unit and an estimation processing unit. The analysis processing unit projects points indicating a combination of a voltage detection value in first time history data of a voltage between the pair of main terminals detected when the pair of main terminals are forward-biased and when the pair of main terminals are reverse-biased and a current detection value in second time history data of detection values of both a forward current and a reverse current between the pair of main terminals onto a coordinate plane including a voltage axis and a current axis on the basis of the first time history data and the second time history data in the power conversion semiconductor apparatus including the pair of main terminals and derives a distribution of the projected points on the coordinate plane. An estimation processing unit estimates a state of the power conversion semiconductor apparatus on the basis of a distribution of the projected points.