How can I do FFT Analysis in MATLAB R2026a with no powergui?

Hello,

since the update to R2026a I am struggeling to use FFT Analysis in Simulink. With the Specialized Power Systems library gone in the R2026a release, powergui in Simulink seems to be no longer available and I can't find a good alternative to the FFT Analyzer.

I am running a Simulink simulation for power electronics and need FFT analysis to get the harmonics, the total harmonic distortion as well as do the visualization of the frequencies. With the old powergui and the FFT Analyzer, visualisation as well as the overall usage was fairly easy.

The virtual desktops that I am using for this simulation are now running the MATLAB R2026a version. And now, I am struggeling to replace the powergui in the new version.

Is there a specific tool, that I am missing in R2026a, to do a similar FFT Analaysis with visualization and calculation of THD? I wouldn't want to start coding programms for this task...

Thank you in advance!

Answer 1

[dpb]

See <Why MATLAB Removed the Entire SPS Library> for an explanation; this appears to have happened with R2025b(+). I didn't go look, but I would presume there were notifications in prior releases about the impending changeover.

It appears that spsConversionAssistant is at least documented in R2026; how well it works for your models, only trying it will tell. AI claims "the standard Simulink Scope block features a built-in frequency analyzer" although I coouldn't see any indication of that feature in the documentation....but, I don't have Simulink so can't go poking at a model to see if it is as claimed or not.

<OPAL-RT> is the distributor for the legacy SPS; it is now a 3rd-party product that will require licensing directly from them. It is another of these infernal <annual subscription model atrocities> starting at about $200/yr.

(+) For existing work, it appears that MathWorks issued an updated release to R2025b that does include SPS so one could revert to it to continue with SPS.

One might want to investigate <MATPOWER>...

[Lars]

Thank you for your answer!

That at least clarified the situation a bit.

[dpb]

In further digging, it appears that the corporate decision to not relicense SPS as a parallel legacy toolset and to remove it completely in one release cycle was done totally without any prior publication of intent by MathWorks. This is totally unprecedented behavior on their part and would certainly shake confidence in being able to rely on stability or a seamless migration path going forward for what may be an essentiall internal corporate infrastructure. Certainly even if the migration tool does work there's additional real costs of doing business passed on to their customers.