What is the formula to calculate THD in Selective harmonic elimination once the switching angles are found ?

Dear All,

In my PV inverter, I have to analyze the AC filter capacitor qualitatively. The switching frequency is 4000Hz. To analyze the AC filter capacitor qualitatively, capacitor voltage and current value at various harmonics have to be checked with respect to fundamental value. Therefore, I would like to make a table for the same indicating f [Hz] v/s Uh/Un [pu] and f [Hz] v/s Ih/In [pu]

May I know from experts what all frequency are important to see the pu value?

I suppose 0Hz, 50 Hz (fundamental), 150 Hz, 4000 Hz (with side bands) are the most important. Can anyone suggest if I misses anything ?

Regards

Aalok

I want clean my signal and shouldn't use any type of filters so I used cleanline (an EEGLAB-Matlab toolbox) to remove 60Hz line noise.

but as you see there is an 113Hz peak and cleanline can't clean it.

I have 3 questions:

1) what is 113Hz noise? is it 60Hz harmonic?

2) can it influence in my Processes?

 3) how can clean it?

I have calculated the main switching angles. But  I am confused that how can i calculate the rest of switching angles for other 9 Mosfet. The code is given below.

1. With respect to hardware implementation of this method

2. With respect to Grid-Connected Photo-Voltaic Systems

Hello to all, i am a graduating student and i am working with qcm-d. My work consists in the functionalization of qcm sensor surface with the purpose of protein detection. I'm looking for a method to analize data that i've obtained. Which harmonic can i choose ? Why choosing one harmonic rather than another one? I've read different articles but no one explain this aspect.

There are number of techniques used to perform harmonic load flow analysis. Generally, there are two methods used to run harmonic load flow, which are time domain analysis and frequency domain analysis. Non-linear load in the distribution system causes negative impact to its power quality especially on harmonic distortion. Charging Station (CS) is a non-linear load used for Electric Vehicle (EV).

What is the effect of harmonic temperature variation on the vibration of rectangular plate with linear thickness in x direction and parabolic thickness variationin y direction?

I have recently obtained a new ccd/spectrograph setup that is nothing out of the ordinary. However, when I go to excite my samples (colloidal nanoparticles in a cuvette) with a laser, my emission spectrum displays strong signals at 2/3 of the wavelength of the laser. I've tried with multiple lasers, and it's always 2/3 of the laser wavelength, I don't see the second harmonic of the laser or anything else besides my expected emissions and then the one at 2/3 my excitation wavelength. Any idea what could be wrong?!

Excitation at 976 nm gives a sharp signal at 650 nm. Excitation at 808 nm gives a sharp signal at 533 nm.