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Is there any way to generate a Nyquist plot in PSIM for any converter topology?

anhnha

Is there any way to generate a Nyquist plot in PSIM for any converter topology? This feature is available in Smart Control, but it's only applicable to some fixed topologies.

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English

PSIM

v2022.1.0

Accepted answers

NikosDimitrakopoulos

Thank you for the info. I'm aware of AC sweep, but the result is plotted in a Bode plot, which doesn't work well for non-minimum phase systems (it's hard to assess stability using the Bode for this type of system). The reason I want a Nyquist plot is so that I can easily check the stability of any systems, including non-minimum phase systems.

Dear user,

When it comes to control system design, PSIM is offering a semi-automated solution for determining the PI gains for the control of your power stage. The workflow consists of two key components:

The first part is getting the AC sweep of your open loop system, essentially the bode plot.
The second part involves SmartCtrl, an Altair Partner tool that has direct linkage with PSIM. You can import the bode plots generated form the AC sweep into SmartCtrl to automatically generate the Nyquist plot and determine the operating point of your converter in terms of cross-over frequency and phase margin. SmartCtrl's interface is depicted below:

For more details on this workflow, feel free to follow:
PSIM & SmartCtrl - Design a Controller in Minutes, Not Hours

Buck Converter Inner Loop design - Video Tutorial

AC Sweeps with PSIM: What makes them unique?

*PSIM itself doesn't offer a Nyquist plot tool as of now

All comments

Marek_Jableka

Hello,

I assume you'd like to analyze the stability of DC-DC converter / Inverter and you need to check whether the amplitude and phase conditions are met.

For that please refer to PSIM simualtion called "AC SWEEP".

It allows to inject predefined time domain sine signal into your DC-DC systems and then observe the stability of your circuit. There is no topoogy limitation in PSIM.

You may find a lot of materials on our Community: AC SWEEP Search - Altair Community

And on Youtube: https://youtu.be/nbFo-NMeY_w?si=KhCLDHFb3sOJlXid.

You may as well refer to PSIM HELP searching for "AC sweep" keyword

Hope this helps.

Regards,

Marek Jableka

anhnha

Hello,

I assume you'd like to analyze the stability of DC-DC converter / Inverter and you need to check whether the amplitude and phase conditions are met.

For that please refer to PSIM simualtion called "AC SWEEP".

It allows to inject predefined time domain sine signal into your DC-DC systems and then observe the stability of your circuit. There is no topoogy limitation in PSIM.

You may find a lot of materials on our Community: AC SWEEP Search - Altair Community

And on Youtube: https://youtu.be/nbFo-NMeY_w?si=KhCLDHFb3sOJlXid.

You may as well refer to PSIM HELP searching for "AC sweep" keyword

Hope this helps.

Regards,

Marek Jableka

Thank you for the info. I'm aware of AC sweep, but the result is plotted in a Bode plot, which doesn't work well for non-minimum phase systems (it's hard to assess stability using the Bode for this type of system). The reason I want a Nyquist plot is so that I can easily check the stability of any systems, including non-minimum phase systems.

NikosDimitrakopoulos

Thank you for the info. I'm aware of AC sweep, but the result is plotted in a Bode plot, which doesn't work well for non-minimum phase systems (it's hard to assess stability using the Bode for this type of system). The reason I want a Nyquist plot is so that I can easily check the stability of any systems, including non-minimum phase systems.

Dear user,

When it comes to control system design, PSIM is offering a semi-automated solution for determining the PI gains for the control of your power stage. The workflow consists of two key components:

The first part is getting the AC sweep of your open loop system, essentially the bode plot.
The second part involves SmartCtrl, an Altair Partner tool that has direct linkage with PSIM. You can import the bode plots generated form the AC sweep into SmartCtrl to automatically generate the Nyquist plot and determine the operating point of your converter in terms of cross-over frequency and phase margin. SmartCtrl's interface is depicted below:

For more details on this workflow, feel free to follow:
PSIM & SmartCtrl - Design a Controller in Minutes, Not Hours

Buck Converter Inner Loop design - Video Tutorial

AC Sweeps with PSIM: What makes them unique?

*PSIM itself doesn't offer a Nyquist plot tool as of now

anhnha

Dear user,

When it comes to control system design, PSIM is offering a semi-automated solution for determining the PI gains for the control of your power stage. The workflow consists of two key components:

The first part is getting the AC sweep of your open loop system, essentially the bode plot.

The second part involves SmartCtrl, an Altair Partner tool that has direct linkage with PSIM. You can import the bode plots generated form the AC sweep into SmartCtrl to automatically generate the Nyquist plot and determine the operating point of your converter in terms of cross-over frequency and phase margin. SmartCtrl's interface is depicted below:

For more details on this workflow, feel free to follow:
PSIM & SmartCtrl - Design a Controller in Minutes, Not Hours

Buck Converter Inner Loop design - Video Tutorial

AC Sweeps with PSIM: What makes them unique?

*PSIM itself doesn't offer a Nyquist plot tool as of now

Thanks! I didn't realize it could work with any topology by importing Bode plots into SmartCtrl. I'll look into it.

NikosDimitrakopoulos

Thanks! I didn't realize it could work with any topology by importing Bode plots into SmartCtrl. I'll look into it.

Happy to help!

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