Bi directional buck boost converter with simulink and simscape only

Hello All,

I did design a bi directional circuit in simscape.I used PWM from specialised power system for producing PWM of variable duty cycle.But i see the simulation runs very slowly.When i try increasing the sample time,the circuit functioanlity disappears. How can I increase the speed of my circuit.Kindly help

I'm using ode15s/dasesimscape solver under variable step configuration

Answer 1

[Zhao Wang]

Sample time is an intrinsic part of the power electronics circuit model. As a result, it would be difficult to speed up simulation by merely increasing the sample time.

There is an alternative way to achieve a faster simulation by using averaged-value models, which does not simulate the switching behavior. You can use the block in the following link to construct your model:

https://www.mathworks.com/help/physmod/sps/ref/averagevaluedcdcconverter.html

As mentioned in the link, you can program the block as a buck converter, boost converter, or buck-boost converter by providing the duty cycle. In your model, simply replace the individual component blocks with a single converter block.

[Sushma n]

Thanks Zhao for your response. I will try that.

[Sushma n]

Hello Zhao Wang. But I see that it is not showing bi - directional behaviour when connected in a circuit

[Vasco Lenzi]

Hi Shusma

Have you tried to right click on the converter-> Going to the top on the "simscape" Menu -> Block choices -> Four Switches converter.