Switching Transient Model Simulation
DSIM, a simulation engine specifically designed for power electronics, adopts an innovative modeling approach called the Piecewise Analytical Transient (PAT) model. This model excels at simulating the switching transients with remarkable speed and stability. Most of the PAT model parameters can be obtained from device datasheets. The simulation results of the switching transient are valuable for analyzing and evaluating the operating status of devices, equipment, and systems. Additionally, DSIM provides a "loss calculation" feature, which utilizes the PAT model to calculate the loss of power switches. For more detailed information, please refer to "Features >> Loss Calculation".
Switching Transient Model Simulation with DSIM
The following shows a case of the switching transient simulation of a 50kVA solid-state transformer (SST) by DSIM. The SST includes three stages of power conversion: AC-DC rectification, DAB isolation, and DC-AC inverter. The rectification utilizes IGBT module with 4kHz switching frequency; the DAB isolation employs SiC MOSFET module with 20kHz switching frequency; the inverter utilizes IGBT module with 8kHz switching frequency. Each stage of the converter employs the switching transient model (PAT model). The schematic is shown as below.
When the modeling is completed, select the switch device. Taking DAB as an example, double-click the module to open the attributes, select SiC MOSFET at the Model Level, and select the SiC MOSFET device of the primary and secondary sides respectively.
The simulation results are shown in the following figure. The upper left shows the voltage of the DAB primary and secondary sides, the lower left shows the input current of grid and the output voltage and current of the load, the upper right shows the switching voltage and current of switching Sa1 of A-phase 3-level T-type converter, and the lower right shows the switching voltage and current of the switching Sa1 on the primary side of the DAB.
The figure below shows the detailed switching transient of Sa1 in T-type 3-level converter (voltage and current waveform of turn-on stage).
