Fourier analysis of 5 pulse MPWM ( multiple pulse width modulation ) for inverter
Hello All, thought I would re-post this here - as it essentially a mathematics problem.
Determine the placement and width of a 5 pulse multiple pulse width modulated (mpwm) system - unipolar on each half cycle
to get the least ( ideally zero ) lowest order harmonics for the 3rd, 5th, 7th, (9th) 11th, 15th
the lower the better for the lower orders as these are the hardest to filter ...
We are looking at 5 pulse MPW for small inverters, 24VDC to 230Vac 50/60 Hz. ( unipolar for those tech savy in this area )
Is there a paper or person out there who has looked at the low order harmonics resulting from the 5 pulse approach and the spacing of the pulses and relative width at full power for lowest harmonic magnitude for the lower order harmonics? - particularly the 3rd, 5th, 7th, 11th, maybe the 15th
I guess I will be doing this from scratch from 1st principles to calc the harmonics resulting from the various arrangements possible - if someone has covered the ground before and zeroed in on the best relative spacing and relative widths I would be appreciative of some pointers in the right direction.
Most important is that the lowest harmonics have the lowest magnitude as, as you go up in freq the higher order are easier to filter.
If some one has the ability to do this work - I would be happy to recompense for sound results
additional info: the middle of each of the 5 pulses ( per half cycle ) is to be fixed, they are to vary in width to control Vout from no load ( skinny ) to full load ( maximum ideal width for min low order harmonics ) - ta.