How to do FFT and THD analysis in MATLAB simulink

In this video THD and FFT analysis for a half bridge converter (inverter) with sinusoidal pulse width modulation (SPWM) is done in MATLAB simulink by simscape toolbox. It is shown that THD decreases as we increase the switching frequency. A fast Fourier transform (FFT) is an algorithm that computes the discrete Fourier transform (DFT) of a sequence, or its inverse (IDFT). Fourier analysis converts a signal from its original domain (often time or space) to a representation in the frequency domain and vice versa. The total harmonic distortion (THD or THDi) is a measurement of the harmonic distortion present in a signal and is defined as the ratio of the sum of the powers of all harmonic components to the power of the fundamental frequency.