- The allowed simulation time is insufficient for the converter to reach steady state. You can increase the simulation stop time to observe the steady-state waveforms.
- Add DC blocking capacitance in series to avoid DC current flowing into the transformer windings.
- Consider using MOSFET (Ideal, Switching) library blocks instead of high-fidelity N-Channel MOSFETs. This modification will help you avoid solver inconsistencies and make your simulation run faster.
- Higher junction capacitance of the switch may require a larger dead time to transition from the on state to the off state reliably. Monitor the switching transitions to assess if more dead time is needed or not.
SImulation termination for SiC-base converter in simscape electriacal
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I tried to use SIC MOSFET devices to build DAB converter, but it was difficult to converge. The model of the device I am using is CAS30012BM2 of Wolfspeed. Compared to ordinary MOSFETs, the characteristic is that the parasitic capacitance is very large. I cannot find a suitable solver configurtation to achieve stable operation. Even if I use discrete and open the local solver to run for a while, an error will be reported, and the waveform of the system will also be distorted. The reason why I think it is related to parasitic capacitance is because I can simulate correctly using the built-in MOSFET in Matlab under the default configuration of the solver. So I wonder how to set this simulation condition, because this circuit is not actually complicated. (I used the MATLAB version as 2020a). Thank you very much.
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Answers (1)
Vishwa Uttam
on 22 Jul 2024
Edited: Vishwa Uttam
on 26 Jul 2024
Hi Zhenyu,
I believe the model is working as expected. I used a global solver (ode23t) instead of a local solver. with a maximum time step of 1e-6 sec.
Below are a few suggestions that can help you increase simulation performance:
I hope you find the above information helpful.
Vishwa
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