State estimation system and state estimation method for power conversion semiconductor apparatus

A state estimation system for a power conversion semiconductor apparatus, comprising:

• an analysis processing unit configured to project points indicating a combination of a voltage detection value in first time history data of a voltage between a 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 derive a distribution of the projected points on the coordinate plane;
• an estimation processing unit configured to estimate a state of the power conversion semiconductor apparatus on the basis of a distribution of the projected points;
• and
• a voltage detection circuit formed so that the voltage applied between the pair of main terminals of the power conversion semiconductor apparatus is able to be detected during power conversion operation using the power conversion semiconductor apparatus.