Is it correct that the PWM generator of 50 kHz is smaller than the one of 10 kHz?
I am working to track the maximum power point for the Solar system theoretically. If both work fine for my system, so which one is better in terms of cost....?
Dear Mr. Hussein
Choosing the the maximum rate of the switching frequency it is related to the passive filter that interface between the inverter and the grid, if you use L filter it doesn't matter as long as the system will be carried out in the simulation, if you use LC or LCL filter you have to take into consideration the resonance frequency.
From the implementation point of view, you have to take also into consideration the maximum switching ability of the power switches (eg. IGBT or MOSFET).
The 2 following research articles could give a better vision of the above explanation.
Article Three-phase Three-level Inverter Grid-tied PV System with Fu...
Conference Paper Implementation of Modified SVPWM for Three-level Inverter Us...
Back to your question I didn't understand what do you mean by " 50 kHz is smaller than the one of 10 kHz", smaller in terms of what??
Regards
You can implement this in the lab. Let us say you have a signal generator that give us a linear line every T. And you have the signal s(t) that you want to have its PWM. If you compare the output of this signal generator and s(t) you will have PWM.
For 50khz you have a T smaller than for 10khz.
As the switching frequency increases the the passive elements ca n be made smaller in size. In fact the reactance wL of the inductor increases linearly will the frequency and the susceptance wC of the capacitors also increases with frequency. To have the same values of the reactance and capacitance at the higher frequency one has to decrease C and L. This makes the inverter or the converter more compact.
Best wishes
Abdelhalim abdelnaby Zekry bdelhalim Zekry
Thank you so much. That helps me.
In case of both PWM generators (50 kHz, 10 kHz) work very well with me, which one I have to use in term cost, lifespan, etc?
Yacine Ayachi Amor
Thanks.
I mean smaller in term of hardware size. My work is simulation, so I am not familiar with the experimental work.
Dear Hussein
welcome
I answered my question from the point of view of the power electronic circuits the inverter ans the converter.
As for the PWM generators which are based mostly on the integrated circuits and very few passive elements the cost will be more or less the same and also the size will be not very different. Also as such control circuits work at low voltage it there lifetime will be large in the two cases as the circuit is well sized.
According to my experience they will not be much different either in size or in lifetime.
Best wishes
You are welcome Mr Hussein Sharadga
I will do my best If you need any help.
the increase of the switching frequency causes the heating of the power switches, which is why the generator size pwm is inversely proportional to the switching frequency
As the switching frequency increases it causes stress on power electronic switch, if find the results are same for both frequencies better to go lesser switching frequency
As the generator size pwm is inversely proportional to the switching frequency, so the increase of the switching frequency causes the heating of the power switches.
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