Modeling and Evaluation of Power Device Loss in the Bidirectional Isolation AC-DC Matrix Converter

In order to evaluate the performance of bidirectional isolation AC-DC matrix converter under different modulation parameters, an accurate model of power device loss is built in this paper. Since the current/voltage of the power device is high-frequency, time-varying and irregular, which is different in each sampling period and hardly able to be estimated directly, the superposition principle is introduced to calculate the current/voltage in the model. Simulation and experimental results show that under different conditions, the simulated and calculated values are essentially consistent and the error percentage between the calculated values by using the model and the real values is within 0.87% in rectification mode and inversion mode, which means that the built model is accurate. Furthermore, by using this model allows for calculation and analysis of the device loss in the converter.