Is there any specific rules to set the parameters for FFT analysis?

Dear beloved community,

I currently doing a simulation project which is Shunt Active Power Filter (SAPF) and I want to find the THD (%) value via FFT analysis.Just wondering is there any specific rules/specifications to follow for parameters Start time(s), Number of Cycles, Max Frequency (Hz) values. Appreciate it if you can advice me on this matter.

Thank you.

[Elyas Smaida]

FFT Analysis will appear but with empty window unless you do the following: " I see somone write it where it helppe me with my simulation

Go to model configuration parameter and select Data Import/Export.

Untick the Single simulation output and click on Apply.

double tap the scope and go to Logging and select Log data to the workspace and select Structure with Time and click on Apply.

Run the simulation

double tap Powergui and select FFT Analysis

Note- MATLAB workspace should have a struct variable including time with the results of the simulation. (e.g. you can use the Scope blocks to log data into the workspace, note that this needs to be struct with time)

Answer 1

[Walter Roberson]

Start time must be a nonnegative real scalar

Number of cycles must be a positive real integer

The two frequencies must be positive real scalars