I am working on the simulation of a Solid State Transformer.It has three modules- the PWM rectifier, the Dual Active Bridge Converter and the Inverter.The modules work well individually but the input current gets distorted with the whole system.Why??

When I am synchronising the PWM Rectifier with the Dual Active Bridge Converter and the Inverter, the current becomes highly distorted. However, the output current and voltage as well as the intermediate stage voltages are perfect as per my design. I have tried several PWM techniques- the abc-dq-abc transform technique, the Direct Power Control technique. However every time it is the input current which gets distorted.

Answer 1

[Taimur Zaman]

Dear Partha Sarthy, As per my knowledge, your input current is distorting because that you are using very high frequency transformer. Since due to very high switching frequency, the energy residues in the transformer winding, and so a huge current start flowing which means simply shorted. You need to design a good series inductor for your dual active bridge, so that during switching, the energy transfers from transformers to inductor and ZVS phenomeno occur.

Answer 2

[Komal Autkar]

I am working on MATLAB/simulink model of Solid State Transformer interfaced Wind Energy Conversion System as my post graduate dissertation work. Can anyone send me the simulation model of solid state transformer?

[Partha Sarthy]

Have you been able to simulate the SST yet?

[Komal Autkar]

Yes. I have simulated SST but not getting exact results. Output waveform is quite distorted with high THD.

[Komal Autkar]

If possible, can you help me to get the proper solution?

[Partha Sarthy]

Hi Komal. It's been some time I have been in touch with the specifics of the project. However, I can surely be of some help if I give a try. Can we sync offline as I rarely open this MATLAB website nowadays?

[Komal Autkar]

Yes..Can you share an email id? sothat I can contact you.

[Partha Sarthy]

Hi Komal. My email ID is [e-mail]